Blackie Posted November 9, 2009 Author Share Posted November 9, 2009 A 500bhp wouldn't be laggy to start with, twin charging would be an overly complex solution I have heared it would take some effort Quote Link to comment Share on other sites More sharing options...
Kirk Posted November 9, 2009 Share Posted November 9, 2009 yeah J has a good point! its when you run these truck turbos that come on boost at 5k that the americans use that are laggy! Quote Link to comment Share on other sites More sharing options...
b_have Posted November 9, 2009 Share Posted November 9, 2009 So, If there was a big single turbo, say 500bhp engine, and you put a supercharger on to combat the massive turbo lag would it turn said 500bhp engine in to 550-600bhp or would it just get to boost quicker? The money you'd need to twin charge it would make fuel economy inconsequential. Quote Link to comment Share on other sites More sharing options...
Blackie Posted November 9, 2009 Author Share Posted November 9, 2009 yeah J has a good point! its when you run these truck turbos that come on boost at 5k that the americans use that are laggy! So when would it normally spool up? 3 1/2, 4k rpm? Quote Link to comment Share on other sites More sharing options...
add heywood Posted November 9, 2009 Share Posted November 9, 2009 yeah J has a good point! its when you run these truck turbos that come on boost at 5k that the americans use that are laggy! Mine does high 20's off boost. When I give it some it drops to about 4 Quote Link to comment Share on other sites More sharing options...
jevansio Posted November 9, 2009 Share Posted November 9, 2009 It's been that long since I've driven mine I can't remember when it spools Are these questions feelers for what sort of turbo would suit your requirements if you went single? Quote Link to comment Share on other sites More sharing options...
Kirk Posted November 9, 2009 Share Posted November 9, 2009 Mine does high 20's off boost. When I give it some it drops to about 4 a good example ! a mid size turbo, take for instance a 67 can make full boost around 4-5k revs but you should see positive boost around 3000-3500 revs. A gt35r on the other hand, setup properly should make positive boost as early as 2800 revs im no expert but i think my numbers are almost right Quote Link to comment Share on other sites More sharing options...
Blackie Posted November 9, 2009 Author Share Posted November 9, 2009 (edited) It's been that long since I've driven mine I can't remember when it spools Are these questions feelers for what sort of turbo would suit your requirements if you went single? I need to go turbo first or if theres a "cheap" single for sale that could be an option. its looking good for the very close future. Edited November 9, 2009 by Blackie (see edit history) Quote Link to comment Share on other sites More sharing options...
Homer Posted November 9, 2009 Share Posted November 9, 2009 So when would it normally spool up? 3 1/2, 4k rpm? If you are only aiming for 500-550 bhp you'd be looking at a T61 which will spool VERY early, much earlier than a TT. I think Wez's one used to make full boost by 3-3.5k in 2nd upwards There is virutally no lag on a turbo that size. Quote Link to comment Share on other sites More sharing options...
jevansio Posted November 9, 2009 Share Posted November 9, 2009 If you are only aiming for 500-550 bhp you'd be looking at a T61 which will spool VERY early, much earlier than a TT. I think Wez's one used to make full boost by 3-3.5k in 2nd upwards There is virutally no lag on a turbo that size. Or a GT35R, best to get a ride in some T61 sized cars and some T67 sized cars to see which suits you best Quote Link to comment Share on other sites More sharing options...
Kirk Posted November 9, 2009 Share Posted November 9, 2009 a 67 is the best all arounder IMO. Makes good power and isnt that laggy Quote Link to comment Share on other sites More sharing options...
Homer Posted November 9, 2009 Share Posted November 9, 2009 One other thing to add is to not get confused between spool and lag, they are two seperate things. In really basic terms: Spool is how quickly the turbo will reach full boost THROUGH a gear Lag is how quickly the turbo will go from idle to full boost once it is in the full spool area. Quote Link to comment Share on other sites More sharing options...
Blackie Posted November 9, 2009 Author Share Posted November 9, 2009 Or a GT35R, best to get a ride in some T61 sized cars and some T67 sized cars to see which suits you best I went in Fearlesses Chargespeed T78 single, that was quite vicious tbh Quote Link to comment Share on other sites More sharing options...
JustGav Posted November 9, 2009 Share Posted November 9, 2009 Too much for a little man like you to handle... Quote Link to comment Share on other sites More sharing options...
Homer Posted November 9, 2009 Share Posted November 9, 2009 I went in Fearlesses Chargespeed T78 single, that was quite vicious tbh No disrespect to Fearless but that's probably not the best of singles to get a gauge of a single setup on. The T78 is an old truck turbo, from the dyno charts it's a slowish spooler, but doesn't suffer too much lag. It's one of those ones that will spool later in the rev range, but hit HARD, giving a sharper torque curve and therefore a great deal of acceleration during it's spool time (i..e as you say vicious). That's not to say it'll be a quicker car, a smaller more modern turbo will provide that kick much sooner in the rev range and have almost no lag. As always, best to get a drive in as many cars as you can before you make your choice Quote Link to comment Share on other sites More sharing options...
Blackie Posted November 9, 2009 Author Share Posted November 9, 2009 Too much for a little man like you to handle... i will try my best No disrespect to Fearless but that's probably not the best of singles to get a gauge of a single setup on. The T78 is an old truck turbo, from the dyno charts it's a slowish spooler, but doesn't suffer too much lag. It's one of those ones that will spool later in the rev range, but hit HARD, giving a sharper torque curve and therefore a great deal of acceleration suring it's spool time. Do you know what BHP it is? Its more phonominal acceleration i'm going to be looking for rather than top end, Hence the idea with the supercharger Quote Link to comment Share on other sites More sharing options...
Homer Posted November 9, 2009 Share Posted November 9, 2009 Do you know what BHP it is? Nope, but I'd guess around 600bhp if it was running right at the time. BHP is not a guide for turbo choice, torque curve is what you need to look at as that defines how it drives. If you're not interested in top end and want something that's going to spool fast then look at a smaller turbo (T61 or T67dbb size) on a cast manifold. Quote Link to comment Share on other sites More sharing options...
Blackie Posted November 9, 2009 Author Share Posted November 9, 2009 Nope, but I'd guess around 600bhp if it was running right at the time. BHP is not a guide for turbo choice, torque curve is what you need to look at as that defines how it drives. trouble is i know nothing about any of it tbh. I thought his was about 600 Quote Link to comment Share on other sites More sharing options...
DODGYDODDS Posted November 9, 2009 Share Posted November 9, 2009 (edited) in theory what bit? An extra 50-100bhp or just taking it to boost? Nitrous would cost too much over time and theres no one to refill down here you must have diving {scuba} shops in devon, they could technically fill your tank bud edit,,, oops convo moved on Edited November 9, 2009 by DODGYDODDS timing (see edit history) Quote Link to comment Share on other sites More sharing options...
Kopite Posted November 9, 2009 Share Posted November 9, 2009 I average 13mpg on average ( ) Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted November 10, 2009 Share Posted November 10, 2009 My GT35R is setup to around 480hp, and I managed to achieve over 30mpg when cruising steadily (had just been done for speeding ) It should be capable of around 550hp, although she's not exactly shy as is Quote Link to comment Share on other sites More sharing options...
caseys Posted November 10, 2009 Share Posted November 10, 2009 I'm running similar to what j above is but on a uk spec auto around town I'm guessing 15ish mpg, booting it around 8-10 though I did do a 202 mile round trip to pick up an exhaust from LeeP's place on Sunday, full tank of fuel when I left and more than half when I got back that was with a mix of motorway, a-roads and 30-40-50mph b-roads. Was very chuffed with that so in theory I could get 400 miles out of a uk sized tank Quote Link to comment Share on other sites More sharing options...
dude Posted November 10, 2009 Share Posted November 10, 2009 Obviously mines not a 'big' single but on boost can be very low! However off boost cruising at 70ish I can easily hit 30mpg Be better now its a 6spd ................................if we can ever get it to release the bloody clutch!!!! Quote Link to comment Share on other sites More sharing options...
Scott Posted November 10, 2009 Share Posted November 10, 2009 Off boost driving should be the same, or better, depending on the ECU and the setup. How much power you have won't make a difference if the bottom end & head is stock. Quote Link to comment Share on other sites More sharing options...
Jazzy Posted November 10, 2009 Share Posted November 10, 2009 Daily driving to and from work, mostly stop start town driving returns me around 13-15mpg. Quote Link to comment Share on other sites More sharing options...
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