View Full Version : Fueling setup for a small single
Okay guys, need some advice on what I'll need to do fueling wise for a small single turbo (450-500rwhp is the target).
So far I've got:
- single walbro pump
- aeromotive FPR with -6AN fittings
- e-manage blue
I know I'll need:
- 650cc injectors (high impedence - top feed?)
A few questions:
1) Can I realistically just fit the injectors into a stock rail using the -6an fittings or do I need to change to -8an?
2) Do I need to modify the rail to dual feed?
3) Do I need to change the fuel line from the pump to the fuel filter to -8an?
4) Should the fuel pulsation damper be removed?
The recent thread from Tlicense was very helpful, but that was for a big turbo, its not clear how much of that applies for a smaller one.
I know I'll need:
- 650cc injectors (high impedence - top feed?) The stock injectors are High Imp/Side Feed. If using the stock fuel rail you'll need side feed injectors again.
A few questions:
1) Can I realistically just fit the injectors into a stock rail using the -6an fittings or do I need to change to -8an? Can't see why not
2) Do I need to modify the rail to dual feed?No, not for your power level.
3) Do I need to change the fuel line from the pump to the fuel filter to -8an? No.
4) Should the fuel pulsation damper be removed?No. Well, some folks do, some don't. CW says it's unnecessary and that's good enough for me.
Homer
are you going to be able to trim those injectors in they seem a bit big going off the rough cc size = hp rule of thumb i use 550's on a T61, or are you trying to future proof
Jake, thanks mate, thats reassuring as its the conculsions I'd drawn (apart from the feed bit). Should save a bundle of cash too!
Paulmac, the injector size is future proofing. Its highly likely i'll move to something larger at a later stage, 650's seem to be a good compromise. The e-manage blue is apparently just about capable of controlling them so its a cost effective choice.
ive got the same spec going on my aristo next week mate, i went with the PE 650s on my sp61 with the emanage blue.
The e-manage blue is apparently just about capable of controlling them so its a cost effective choice.
ahh right, was'nt sure the e-manage would trim in that far but you've obviously done your home work
ahh right, was'nt sure the e-manage would trim in that far but you've obviously done your home work
Well not exactly, my homework is being done right here now :D Do you know (or have heard of) any reason why the EM blue won't control them? I'm only basing on a few previous threads here where people have mentioned it can do it.
If not then EM ultimate would need to be on the cards (much as I'd like to have one, there's no way can I afford a proper standalone)
dont worry mate the emanage blue will be fine trust me
Homer ..I'm running 800's on the Blue , its close to the max size it can handle
650's on the EMB are fine, I know of several running them :)
I wouldn't recommend 550's on any single turbo setup as it usually leads to disappointment at the low boost level you have to run :shrug:
-Ian
There seems to be more mis information in this thread...
If anybody bothered to read Pig's Dyno thread you'll have seen that it's now been prooved that 550cc injectors can't really handle a T61.
T61's require 650cc Hi-Imp injectors on a J-spec and 650cc Lo-imp on a UK spec.
The Emanage Blue can trim upto 50% this means that in theory 880's can be trimmed back into 440's (which is what you want for the idle to work). However I wouldn't go above 800cc on an EMBlue. The EMU however does give you more head room....how much more hasn't been proved yet.
So in Homers' case
650cc Hi-Imp SIDE FEED injectors.
EMB is fine.
The walbro is fine
Homer, you don't need to worry about any of the rest of it. Get the aeromotive plumbed into the stock return. The stock lines and rail will be fine.
I can say this cause my 1.4bar running T61 used the exact same setup.
****EDIT - Ian posted whilst I was writing god damn it!! ;) *****
There seems to be more mis information in this thread...
If anybody bothered to read Pig's Dyno thread you'll have seen that it's now been prooved that 550cc injectors can't really handle a T61.
wow thats a bit of a sweeping statement mate, mine got dynoed on 550's on a 61 and there were no "headroom" issues at 1.4 bar, the boost could have been taken higher but Thor recomended on stock bottom end and transmission 1.4 is a safe max and its at the customers risk if you want to run higher, this wasn't an A/F issue it was a blown engine issue lol, i can understand future proofing but dont put people off 550's (cheap) on a T61 as there are quite a few on this board running very happily with safe A/F's and 500 rwhp
wow thats a bit of a sweeping statement mate, mine got dynoed on 550's on a 61 and there were no "headroom" issues at 1.4 bar, the boost could have been taken higher but Thor recomended on stock bottom end and transmission 1.4 is a safe max and its at the customers risk if you want to run higher, this wasn't an A/F issue it was a blown engine issue lol, i can understand future proofing but dont put people off 550's (cheap) on a T61 as there are quite a few on this board running very happily with safe A/F's and 500 rwhp
Aggree with that. Ran 550's/T61 for 0ver 3 years at up to 1.5bar with afrs in the 11s. (may well have been stretched) Only upgraded to 650s for headroom (and 2bar)
Chris Wilson
02-06-06, 11:35
wow thats a bit of a sweeping statement mate, mine got dynoed on 550's on a 61 and there were no "headroom" issues at 1.4 bar, the boost could have been taken higher but Thor recomended on stock bottom end and transmission 1.4 is a safe max and its at the customers risk if you want to run higher, this wasn't an A/F issue it was a blown engine issue lol, i can understand future proofing but dont put people off 550's (cheap) on a T61 as there are quite a few on this board running very happily with safe A/F's and 500 rwhp
Whats's the injector duty rate like at max torque and boost?
Yes, I'd like to know that as well please :) And your static pressure.
-Ian
Think my 525's were at nearly 90% at .8bar with 38psi static on the FPR, just to add another in for the record
Whats's the injector duty rate like at max torque and boost?
i am not going to hijack Homers thread as he isnt even using 550's so its not an issue, in answer to your question Chris i dont know and i dont care i let the good people at Thor sought all that and as for "static pressures" Ian again Thor set that up so again i dont care, when i see comments like you cant run a T61 with 550's and a lot of people ARE running them safely i feel we need to give a balanced view for people reading this thread who may be going this route, i specifically asked Thor when i was there would there be any advantage using bigger injectors and was told none what so ever unless (key word here) i went for a bigger turbo or cranked up the boost, i was also told i'de really have to ditch the SAFC/ITC if i went bigger as well which i think is all fair comment, i'me not going to respond any more to the thread as i can see were turning it into a 550 and safc bashing thread AGAIN
Dragonball
02-06-06, 19:42
Paul - I think you are being over sensitive
it is a reasonable question m8....
I too was under the impression that 550's were fine - wasn't it previously mooted elsewhere that it was OK to run stf / budget kit with a T61 on 440's? (incorrrect or am I missing a point here?)
i am not going to hijack Homers thread as he isnt even using 550's so its not an issue, in answer to your question Chris i dont know and i dont care i let the good people at Thor sought all that and as for "static pressures" Ian again Thor set that up so again i dont care, when i see comments like you cant run a T61 with 550's and a lot of people ARE running them safely i feel we need to give a balanced view for people reading this thread who may be going this route, i specifically asked Thor when i was there would there be any advantage using bigger injectors and was told none what so ever unless (key word here) i went for a bigger turbo or cranked up the boost, i was also told i'de really have to ditch the SAFC/ITC if i went bigger as well which i think is all fair comment, i'me not going to respond any more to the thread as i can see were turning it into a 550 and safc bashing thread AGAIN
Oh FFS...right, I'd forgotten about your setup and Charlie's too, so ok you can get 1.4bar on you T61 ..I hold my hands up and admit I may have added some more mis-information.
So why can't Jon if your setups are the same?? Anyone got an idea (instead of a strop)?
PS I do not count EBay T60-1's from Turbofit etc as T61's...because they arn't T61's!! T60-1's are much much smaller.
Hands up who's got a Precision based T61 or a Garrett GT35R on 550cc injectors. Once we know we can investigate further, the differences in the setup's etc.
Hmmm why was Jon's so limited...would an old fuel pump on the verge of dying be a valid reason?
im sure clarkey was running a t61 from BL with 550s
im sure clarkey was running a t61 from BL with 550s
Cool - what boost?
lol god knows 1.4 bar * i think not sure, terry or clarkey himself would be able to give more detail
Think he's at 1.4 IIRC
EDIT: beaten to it by the goon above :D
I am on a BL T61 with 525's, Ian has my permission to show the logs
Complete thread hijack. :) But I think Homer's got his info now so I hope he doesn't mind :)
Right well obviously there's a pattern there.
Sooo Ian was seeing really high duty's because he wasn't having to trim the injectors much. And the ECU was trying to give full beans cause they were near 1bar.
So, ideas then.
Partially blocked injectors?
Low fuel pressure due to knackered pump or knackered Fuel Pressure regulator.
Wierd electrical fault?
Any others?
Thanks Alex and Ian for the advice, much appeciated!
No problem with the hyjack, my questions have been answered :)
Alex,
Do we have any afr logs to look at for the run that didn't produce the goods?
What about intake temps and fuel quality - any timing pulling going on?
Compression or leakdown test results?
Cam timing correct?
Definitely getting 100% throttle opening?
Trac butterfly in correct orientation?
Boost pressure we think was run, was this measured - at turbo? or at plenum?
Just a few ideas.
.
Hands up who's got a Precision based T61 or a Garrett GT35R on 550cc injectors
errrr that will be me then Boostlogic T61 on tubular manifold 510 rwhp @ 1.4 bar boost, s**t i said i was done with this thread but it annoys me that some people get so upset that you CAN run this turbo on 550's and shock horror SAFC/ITC and even worse ......................wait for it :eyebrows: .............an FSE fuel regulator:hide:
veilsideTT
02-06-06, 23:47
I ran UK 550's at 1.4bar on a Power House Stage1 kit (T61) and MAP ECU.
I got 510rhhp
Pete at thor told me not to go any further with the boost as would be pushing my luck fueling wise.
AFR's were fine.
Scotty
[QUOTE=wait for it :eyebrows: .............an FSE fuel regulator:hide:[/QUOTE]
That may be why, I was also running FSE.
Thanks Scott...definately looks like there was an existing problem before Pig's was modified.
Looks like you're all able to get to the ~550FlywheelBHP old rule of thumb maximum on 550cc injectors.
errrr that will be me then
No s**t...I meant other people....as you were done with this thread and all you wanted to do was rant.
veilsideTT
03-06-06, 11:18
alex, if i hit 510 at the wheels (hubs, whatever :d ) then flywheel would be a lot higher with an Auto!
I beleive its around the 20% mark (can of worms :d )
No s**t...I meant other people....as you were done with this thread and all you wanted to do was rant.
I think that is a little unfair mate. He defended his set up against certain (in your words) mis-information. You then asked if anyone was running a BL type turbo with 550's etc and he replied he was. Hardly a rant eh?
alex, if i hit 510 at the wheels (hubs, whatever :d ) then flywheel would be a lot higher with an Auto!
I beleive its around the 20% mark (can of worms :d )
Believe what you like mate - not a fan of Thor figures myself. :thumbs:
I think that is a little unfair mate. He defended his set up against certain (in your words) mis-information. You then asked if anyone was running a BL type turbo with 550's etc and he replied he was. Hardly a rant eh?
He got arsy twice...even after I'd held my hands up...what more did he want?
AlexSubtle/Diplomatic
Club Member
:search:
He got arsy twice...even after I'd held my hands up...what more did he want?
Flowers? or perhaps a nice card?
Thanks Scott...definately looks like there was an existing problem before Pig's was modified.
Looks like you're all able to get to the ~550FlywheelBHP old rule of thumb maximum on 550cc injectors.
Only if there's an increase in static pressure or you run them at 100% duty :eek:
A good "rule of thumb" is that 1cc of fuel will make 0.6-0.65BHP (B.S.F.C) on a turbocharged car. Multiply that up to 550 and you get 523bhp, but then you wouldn't want to run your injectors more than say 85% so 85% of 523 is 445BHP.
Of course if you increase the static pressure, then effectively you're increasing the size of the injector, but then it's no longer flowing 550cc's is it?
if you increase the static pressure, then effectively you're increasing the size of the injector, but then it's no longer flowing 550cc's is it?
Which is why - I've got myself an Aero FPR. My car runs 1.4 bar for the occassional play. AFR's are about 11.7 at that point - if memory serves.
My car's fueling is setup - safe. But I want it to be safer & the map more accurate. Because as far as I know .. the SAFC-2 only monitors RPM - not boost pressure. So, upgrading to an E-Manage blue - shortly.
veilsideTT
03-06-06, 18:22
Go for a Dyno anywhere! Someone will always say "their figures are bullshit"
No win situation!
Go for a Dyno anywhere! Someone will always say "their figures are bullshit"
No win situation!
:iagree:
Go for a Dyno anywhere! Someone will always say "their figures are bullshit"
No win situation!
It's not that sinister. But it is true. It's only because Dyno numbers - given from rolling roads can vary alot. Because of this, performance figures are either overstated or understated - so getting an accurate BHP figure is v.difficult.
I think the trap times from a standing quarter ... gives a much better comparison.
It's not that sinister. But it is true. It's only because Dyno numbers - given from rolling roads can vary alot. Because of this, performance figures are either overstated or understated - so getting an accurate BHP figure is v.difficult.
I think the trap times from a standing quarter ... gives a much better comparison.
Yea so if you get your car dyno'd anywhere apart from thor,there seems to be a lot of members on here that seem to think it doesnt count,the dyno sheets bullshit,the graph looks wrong etc etc etc.
IMO:)
alex, if i hit 510 at the wheels (hubs, whatever :d ) then flywheel would be a lot higher with an Auto!
I beleive its around the 20% mark (can of worms :d )
I am defo gonna go to thors.lol..
I only made 430bhp at the wheels @ about 1.3 bar..
michel lane
04-06-06, 10:54
I have bought various turbo's in the past encluding the ebay type units. The pt70 turbo , that is advertised on the SS autochrome is a 60.5 trim turbo with a .70 AR , I have used this on a friends car , it does provide an excellent replacement if your twins have gone , the power on these units is very aggresive -(they do kick in at a very steep power curve) and fade off at the top end scale , i found the driving method to be to aggresive as i prefer a turbo that brings the on gradually , even with the boost controller gain set to the min , we were still spinning the tyres at 4500rpm from 1-3 gears . He established a good 550hp at the crank running 550 injectors boosting at 1.4 bar . the inject duty cycle was hitting 95% so there was no room to play with . He has now installed a gt4080 turbo this has a 64 trim and .80 AR , running high imp 650 MOTRON (power enterprise) injectors test flowed to 90%. The power delivery on this turbo was not as aggresive but very liner across the power curve, he likes the setup because you can control the power delivery exiting a roundabout rather then oh shit power is on, power is off as on the t70 ebay job . He now still had 550hp but torque went up to 410 and duty cycle on 1.4 bar is only 65%. .
spec :
gt4080 .80ar
dual fuel walbro fuel pumps
aeromotive fpr
650 high imp MOTRON
hks fuel rail
ebay FMIC
AEM
So to recap , 550 will run a T70 ebay or PTE61 /BL61 but if you run on on the 500-540hp border region then pushing the 550cc to 90-95% cycle is not really recommended, but on the flip side running 550cc using stock rail and sp61 set at 1.3bar is much better then twins , remember is not all about HP , but about how the turbo brings the power on ... well thats my little bit of input based on my experiance .
Dragonball
04-06-06, 10:56
Nice one Michel
Oooh, this took off in the last couple of days.
Paul Mac, my dear chap, I wanted to know those numbers to see what's different between your setup and all the other 550cc ones I've personally seen. It wasn't a trap, or a shot across your bows, just a genuine attempt to see why yours works. Unfortunately you don't know these things so, as much as you say "it works!" there isn't really much useful info in that :shrug: I'm not saying it doesn't work, obviously it does because your car moves :D
I think it's all down to fuel pressure and possibly how far people are willing to push their duty cycles. If you want to wind the pressure up to make 550's behave like 620's or so on your own car then that's fine, but I'm not going to do that on other people's cars. Same for running 95%+ duty :shrug:
-Ian
I think it's all down to fuel pressure and possibly how far people are willing to push their duty cycles.
Ian, how much fuel pressure are we talking about ? Mine is currently set to 40psi which from many sources I'm told - it's stock. But I've read on here that 36psi is stock too.
I ask only because - you're going to mapping my E-Manage ;)
Ian, How do you calculate the duty cycles ?
Can the EM do that for you ? Or do you apply a formula to the data - logged by the EM ?
(Rhetorical question)
Is an upgrade to 650's on the cards ? :( More money! ;)
Dragonball
04-06-06, 12:26
A small search reveals some interesting stuff from Ash (another victim) over 5 years ago
Some phsics supporting the injector sizing and effect if you increase from the 36psi stock....
http://www.mkivsupra.net/vbb/showthread.php?t=614&highlight=stock+fuel+pressure
That's alot of maths ... :confused:
interesting stuff from Ash (another victim) over 5 years ago
Even more .. :confused:
Alex, im running a brand new walbro pump so i presume the must be clogged up! Its done over 100 K now.
I am going to get an Aeromotive FPR, new injectors (not sure exactly which ones to go for) and blitz colour boost controller.
This should help sort it out, what boost will i be able to run up to on 650cc?? I would like to be able to up the boost V.High, so is it worth going for a big set of injectors?
Now wondering what the stock internals can handle and the autobox??
And, what benefits i would get from changing the cams?!
letmeshowyou
04-06-06, 14:32
have you had the compression test done now Jon? What were the results?
Nope, Car is going to pheonix as soon as he can fit me in. Am going to stop using it as its leaking coolant now when i use it :) Its going away untill its sorted.
terribleturner
04-06-06, 14:46
Jon, it's leaking coolant?? Why's this?? Radiator on it's way out??
No :( Brand new fluidline. I dont know where its coming from. It looks like the back of the engine!
This should help sort it out, what boost will i be able to run up to on 650cc?? I would like to be able to up the boost V.High, so is it worth going for a big set of injectors?
Now wondering what the stock internals can handle and the autobox??
And, what benefits i would get from changing the cams?!
Your turbo (T61 P : 550-600hp(3600-4000rpm)American figures) will give up the ghost before you max out the 650's so no need to go any higher mate. You are limited to how high you can wack up the boost if you are using Optimax. I would say no higher then 1.5-1.6bar tops. Put in some race gas and you can go higher still...
Stock internals can go at anytime, it has more to do with the current condition of the engine then it has with the amount of boost you are running. I would say that if your engine is healthy and you have all the supporting mods in place and it is all set-up properly you should have no problems with your internals. I remember you telling me that you have a high mileage engine though so I would be sensible if I was you.
Auto box should be good for up to 500rwhp but again that is dependant on the condition of the gearbox and if it has been properly maintained. You should not hammer it though every chance you get as you will be on borrowed time...
Cams will enable you to make better use of the power band.
michel lane
04-06-06, 19:55
I think alot of people get carried away with how much boost and HP they make . For all you people out there have you actually been in a properly tuned 500hp car ?? 500hp on a small single is alot of power especially the way it delivers the power . I know the idea of having 650hp -800hp is wonderful , but have you driven something like this , espcially on normal roads ?the power comes in to strong, forget about exiting a roundabout in 3rd gear when the boost comes in , the back end just goes dulali , i know RLTC can play a large part in putting the power down , but whats the point in having all that power when the RLTC is cutting it back ?? would you be better having a 500-550hp which is more controlable ??. Thats my opinon...I know coming from me with a PTE71 GTS that sound like crap , but iam actually changing down to a gt4088 for the summer as i prefer this power delivery then my exsisting turbo.
I also have a ITS 74DBB GTS going on for drag racing aswell later in the year.
That's alot of maths ... :confused:
Even more .. :confused:
It's actually quite a simple equation. I'll attach a spread sheet that will help all....
I've saved the spread sheet for the values as Clarkey has mentioned them on here, so this shoud relate directly to his set-up. However I don't know what duty cycle he's running. I consider 80% to be the maximum I would like to see (subjective) so if we can find out what duty he is running you would simply put that figure in as a decimal into cell B4 and that should tell you the horsepower he can achieve with his particular injectors at the static pressure he mentioned.
Hope that helps mate!
Go for a Dyno anywhere! Someone will always say "their figures are bullshit"
No win situation!
Absolutely. People get so transfixed with absolute figures. My phillosophy is to use a dyno figure as a baseline and then use the same dyno and just concentrate on the relative increase (hopefully ;) )
When people ask me what horsepower my car makes, I only ever say it's about X. (My current about number is 350 :innocent: )
Oooh, this took off in the last couple of days.
Paul Mac, my dear chap
-Ian
sorry Ian i thought i was getting tag teamed by you and Mr Wilson, fraid i cant tell you anything as the car is off the road at the mo
Chris Wilson
04-06-06, 21:47
I think alot of people get carried away with how much boost and HP they make . For all you people out there have you actually been in a properly tuned 500hp car ?? 500hp on a small single is alot of power especially the way it delivers the power . I know the idea of having 650hp -800hp is wonderful , but have you driven something like this , espcially on normal roads ?the power comes in to strong, forget about exiting a roundabout in 3rd gear when the boost comes in , the back end just goes dulali , i know RLTC can play a large part in putting the power down , but whats the point in having all that power when the RLTC is cutting it back ?? would you be better having a 500-550hp which is more controlable ??. Thats my opinon...I know coming from me with a PTE71 GTS that sound like crap , but iam actually changing down to a gt4088 for the summer as i prefer this power delivery then my exsisting turbo.
I also have a ITS 74DBB GTS going on for drag racing aswell later in the year.
I have quoted your post, as, IMHO, it's worth reading several times as it is so true, and such good sense. Even on my full race Skyline engine, in build, I am only aiming for a max of 600 BHP, and i too will be using a GT4088R for starters. My car had an alleged 560 HP when I got it, cited by several RR readouts. On a proper engine dyno it really had 410, on race fuel and a lot of boostyet still did a low 11'a on street tyres, for you drag race figure lovers. It now has about 440, but with much better drivability, thanks to decent mapping, and the cams being properly timed in.
Don't get carried away with power figures, you need area under the graph, good mapping, and a sensibly selected set of engine parts to give reliabilty.
TBH it's not the 1st time it has been said. There is a long list of people that have been saying 500 in a well set up car is awesome. But it's not very good for when you are in the pub chatting about cars :p
No :( Brand new fluidline. I dont know where its coming from. It looks like the back of the engine!
Heater Matrix ?
What is a gt4088? How does that compare to a T67dbb?
http://www.mkivstore.com/index.php?target=pages&page_id=443355888
Scroll down to bottom, there is a calculator there if it helps anyone.
TyranoSupraRex
17-06-08, 12:16
Only if there's an increase in static pressure or you run them at 100% duty :eek:
A good "rule of thumb" is that 1cc of fuel will make 0.6-0.65BHP (B.S.F.C) on a turbocharged car. Multiply that up to 550 and you get 523bhp, but then you wouldn't want to run your injectors more than say 85% so 85% of 523 is 445BHP.
Of course if you increase the static pressure, then effectively you're increasing the size of the injector, but then it's no longer flowing 550cc's is it?
I'm not having a dig, but is it just me or does 0.6 * 550 not equal 523? I get 330....
Have you checked the date on this thread;)
TyranoSupraRex
17-06-08, 12:31
Yup, but info is info :)
Yup, but info is info :)
The info is right, the numbers don't appear to be... but you'd be using your own numbers anyway wouldn't you?
TyranoSupraRex
17-06-08, 13:50
Yup, looking to go single, probably gt35 or t04z, or something similar (trying to organise a few drives on Sunday at JapShow to make up my mind). Don't need huge horsepower figures, but want something very quick off the line up to 120-130 and after that I'm not that fussed.
Looking to spec a fuel system with enough headroom if I change my mind later but don't want to go overboard. Probably buy things in bits and pieces and then assemble all at the same time. I initially was going to go for bigger injectors and max out the standard turbos, but decided against that as I know I'll want more so may as well do it properly.
Nic has the GT35 with 680 injectors, so was going to do the calcs with that and see how much room I had.
Yup, looking to go single, probably gt35 or t04z, or something similar (trying to organise a few drives on Sunday at JapShow to make up my mind). Don't need huge horsepower figures, but want something very quick off the line up to 120-130 and after that I'm not that fussed.
Looking to spec a fuel system with enough headroom if I change my mind later but don't want to go overboard. Probably buy things in bits and pieces and then assemble all at the same time. I initially was going to go for bigger injectors and max out the standard turbos, but decided against that as I know I'll want more so may as well do it properly.
Nic has the GT35 with 680 injectors, so was going to do the calcs with that and see how much room I had.
Today 12:35
683cc with bsfc of .65 and a 20%saftey margin was what I calculated IIRC with an aim of 550bhp on the GT35R at 43.5psi Fuel pressure,
I'm going 850's as I intend to go with a bigger Turbo after the GT35R, probably a T67dbb, 850's will be more than enough for 650bhp.
TyranoSupraRex
17-06-08, 14:05
683cc with bsfc of .65 and a 20%saftey margin was what I calculated IIRC with an aim of 550bhp on the GT35R at 43.5psi Fuel pressure,
I'm going 850's as I intend to go with a bigger Turbo after the GT35R, probably a T67dbb, 850's will be more than enough for 650bhp.
Thanks for that. Just the kind of info I was after.... :D
Thanks for that. Just the kind of info I was after....
I will post up my workings tomorrow, I dont want to mis-quote the calcs, but 683 defo sticks in my mind, and I know my other aims
Regarding other threads where you are gathering info(and this is the reason I hate people automatically posting 'search':rolleyes:)
A lot of these guys that have posted in these threads have came through the same questions you are asking, and have now tried and tested methods for tuning, so dont take everything you read as gospel, google it and confirm, they were all learning too at one point, we all still are! The physics never changes though, be sure of that;)
TyranoSupraRex
17-06-08, 14:21
Sorry to be a pain...I'm usually pretty good at searching but got carried away with the subject of the thread. I'm only just starting to scratch the surface but am putting together some thoughts and will post more sensibly.
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