View Full Version : EGT Sensor Fitting
SupraJames
24-04-06, 15:24
Have got a nice new EGT gauge and was wondering where the best place to fit the sensor to was..? Has any body got any pics of their sensor fitted, guides etc..? Thanks
Best place to fit it is in the header to the front exhaust (no1 i think)
Guide:
1. take it to Chris Wilson. He can do this in about an hour.
SupraJames
24-04-06, 15:41
Cool, where is Chris Wilson..? and any ideas on price..?
Soonto"HAS"soop
24-04-06, 16:30
Chris Wilson is a bit of a trek from you, Matt Harwood used to have a guy that did this, not sure if he can still get hold of him or not though. Takes him about 1 hour also.
Also, the BEST position is apparently in the No.6 exhaust rather than No.1 as it is tucked up into the bulkhead.
SupraJames
24-04-06, 16:34
Ok cheers, will speak with Rebas Systems as they have done a few bits on the car. Adding a few gauges, like oil temp and pressure at the same time, think I need one of those Greddy Oil Filter ring things, with the 3 outputs for gauges on it..! They are so pricey though..!!
SupraJames
24-04-06, 18:09
Ok so far number 1 exhaust and number 6..?? does it make much difference, closer to the firewall would be good as I am not sure how long the cable to the controll unit is..!
Also, the BEST position is apparently in the No.6 exhaust rather than No.1 as it is tucked up into the bulkhead.
:)
Soonto"HAS"soop
24-04-06, 18:22
:)
LOL!
No.6 is better, but is much harder to get to, hence why most people get it put in no. 1.
SupraJames
24-04-06, 18:24
LOL!
No.6 is better, but is much harder to get to, hence why most people get it put in no. 1.
Im not fussed im not doing the work..!! lol
Soonto"HAS"soop
24-04-06, 18:43
Im not fussed im not doing the work..!! lol
OK then, No.1 will be cheaper to get done than No. 6. You may even struggle to get anyone wanting to do it into No.6.
Tricky-Ricky
24-04-06, 20:55
I have put mine in the down pipe just under the turbos, as i'm not keen on the idea of the sensor failing and may well take out the turbine!:(
if you do want to fit the sensor into no1 or no6 exhaust runner, i would be inclined to take the whole lot off in order to do this, as swaf that is left in the runner or turbo is not a good thing! there are people that advocate drilling and tapping the runners whilst the engine is running i am also a rather dubious of this practice, as you cannot be sure that all of the swaf is expelled! and i certainly wouldn't want metal going through my turbos:(
SupraJames
25-04-06, 13:13
Yeah maybe in the downpipe would be a better idea..! was thinking of changing the downpipe to a bigger HKS one anyway..! Could get the 2 things done together..! Right off to find downpipe prices..!
I had mine in runner #1 when I got CW to fit it. The difference between #1 and #6 isn't that great. Having it after the turbo is a tad futile as you are sticking your finger in the wind to work out the temperature loss across the turbo.
CW has a special tool and a well-honed procedure to fit the probe without dismantling the turbos to pull the manifold. No swarf is introduced to the system.
-Ian
secondjump
25-04-06, 15:49
Not sure if there is any point putting the sensor in the down pipe, it will not give an acurate reading from that position...although it is a valid worry that it could break and damage the turbo whilst mounted in the exhaust runner.
Mine is in runner 6, and yes I like to live close to the edge :D :D
secondjump
25-04-06, 15:50
Damn you....Ian :D
SupraJames
25-04-06, 16:55
I had mine in runner #1 when I got CW to fit it. The difference between #1 and #6 isn't that great. Having it after the turbo is a tad futile as you are sticking your finger in the wind to work out the temperature loss across the turbo.
CW has a special tool and a well-honed procedure to fit the probe without dismantling the turbos to pull the manifold. No swarf is introduced to the system.
-Ian
Cheers Ian all sounds very good, sadly CW seems to be quite a way from me, not that I actually know where he is..! Will speak to a few people and see what they can do.!
I had mine put in the down pipe and I can appreciate peoples concerns about the temp obviously being out, but I have been told to add 150 to the down pipe temp to give you your rough manifold temp, and rough is close enough for me to see if my cyclinder temps are starting to knock on towards the 950 degree mark, thats all its there for, 2 guid me on whats going on. That out-weighed my decision at the time of fitting for pre or post turbo, but out of curiosity, how many EGT probs do we know of that have failed and caused turbine failure ??
I havent heard of a lot in just under 5 years, maybe one, so next time round I'd prob get it put in the manifold.............
I've heard of two going :shrug:
I also heard add 200degC onto the temps if it's post-turbo :) My old hybrid setup used to run 910degC absolute worst case scenario (30degC ambient temps, TOTB2, standing start to 170+mph top speed run) and that was measured in runner 1. It's nice to know that figure was accurate if you see what I mean - if you get 780degC post turbo, is that safe or not...? :blink:
-Ian
Chris Wilson
26-04-06, 12:13
If you are that worried abot the tip failing (and it would only fail if it melted, and a melted tip usually means a melted piston), do as I do and buy Inconel probes and either use them with an existing "bling" gauge, or use an RS meter and buy a multi input one to read EGT and intake air temps on one meter. they are ugly though, but i always go for functionaility over bling. It MUST be near the exhaust valves, ideally in the combsution chamber isteslf, initial engine development is usually done with special plugs that can measure combustion temps and even instantaneous combustion pressures in each cylinder. After the turbo(s) is pointless.
I heard that occasionally they can shatter :shrug: With my tubular manifold I compromised and put the probe in the collector, positioned carefully so that if it did break it'd go through the wastegate rather than the turbo. It means the probe is 12" from the exhaust port though, but as I only see 850degC I'm not overly concerned :)
-Ian
With mine in the manifold I see approx 600deg on a 70lepton cruise and approx 700deg on a 100lepton cruise.
:)
i put mine here just to be safe, i heard the stories of cracking probed too :blink:
SupraJames
26-04-06, 17:52
Ohhhh now im confused..! Dont know where to put it, and who to fit it..!
For a true reading then the exhaust manifold :)
it takes no fitting really mate,drill a hole, tap it, screw in adaptor, fit probe !
And clean up swarf :) Which is interesting on the stock setup :)
My 850degC is a WOT from a standing start to over 180mph :tongue:
-Ian
Tricky-Ricky
26-04-06, 18:21
i put mine here just to be safe, i heard the stories of cracking probed too :blink:
Is that a wideband lambda? if so have you ever had any overheat problems?
SupraJames
26-04-06, 18:25
it takes no fitting really mate,drill a hole, tap it, screw in adaptor, fit probe !
sadly i dont have a tap, plus would not be totally happy about drilling holes in my manifold. I know a bit about engines, just not enough..! :cool:
Is that a wideband lambda? if so have you ever had any overheat problems?
no,no overheating probs, was in the market for some new gauges and that was on my list since i went single
if you get 780degC post turbo, is that safe or not...? :blink:
So I guess from two stories we could say its not a common problem probably considering the amount of people running EGT's.
Ian I would say 780 is just ok, + 200 (tops..) = 980, as I said I was told 150, so that would mean 930, I believe if your hitting the 1000 then things can start to melt........
With mine in the manifold I see approx 600deg on a 70lepton cruise and approx 700deg on a 100lepton cruise.
:)
Thats strange, when at 80mph mine reads 600 dead, and thats post turbo, your seeing 600 at 70 pre turbo..........???
Thats strange, when at 80mph mine reads 600 dead, and thats post turbo, your seeing 600 at 70 pre turbo..........???
Would be interesting to know what your AFR is as mine is approx 14.7 - 14.3AFR, do you have any cats in place, are you still on stock tubbies?
EDIT: just read your sig, you on hybrids with full decat.
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