What EGT are people seeing?
27 August 2002, 10:43 AM
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Trying to gauge what exhaust gas temps are normal and acceptable.
I have an STi Type UK, with the Defi Link Gauge setup. I am curious as to what others are seeing under both normal driving conditions and motorway blasts.
I have the EGT probe sitting about 4 inch down the exhaust manifold, on the little flat area which I guess it is designed for this sort of purpose.
My car it totally standard when it comes to the drivetrain. The car has peaked on several occasions at 900 degrees exactly. Averaging around 750-800 degs under normal driving.
Interstingly, when driving on full boost, typical motorway driving, the EGT temps drop. In fact, it seems to consistently fall off when on turbo boost.
Was curious to see what other people were getting, and with what measuring equipment obviously. Also, any comments on whether my temps sound normal/OK or not.
Many thanks.
YorkshireSimon.
I have an STi Type UK, with the Defi Link Gauge setup. I am curious as to what others are seeing under both normal driving conditions and motorway blasts.
I have the EGT probe sitting about 4 inch down the exhaust manifold, on the little flat area which I guess it is designed for this sort of purpose.
My car it totally standard when it comes to the drivetrain. The car has peaked on several occasions at 900 degrees exactly. Averaging around 750-800 degs under normal driving.
Interstingly, when driving on full boost, typical motorway driving, the EGT temps drop. In fact, it seems to consistently fall off when on turbo boost.
Was curious to see what other people were getting, and with what measuring equipment obviously. Also, any comments on whether my temps sound normal/OK or not.
Many thanks.
YorkshireSimon.
27 August 2002, 11:59 AM
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On boost the temps can drop initially as the car is running much richer and so cooler EGTs - stay on boost and the heat will build up again.
When you say in the exhaust manifold - what do you mean - headers, uppipe (i.e. before the turbo), downpipe (i.e. after the turbo).
In mine - before turbo - I was getting 800-950 due to weak fuel pump. Now that is fixed - I get 700-800 on fast cruise - up to 900 peak driving flat out.
I try and keep it below 900.
These temps are ok in the headers/uppipe - go for around 75-100 deg lower in the downpipe.
Trout
[Edited by Trout - 8/27/2002 12:00:37 PM]
When you say in the exhaust manifold - what do you mean - headers, uppipe (i.e. before the turbo), downpipe (i.e. after the turbo).
In mine - before turbo - I was getting 800-950 due to weak fuel pump. Now that is fixed - I get 700-800 on fast cruise - up to 900 peak driving flat out.
I try and keep it below 900.
These temps are ok in the headers/uppipe - go for around 75-100 deg lower in the downpipe.
Trout
[Edited by Trout - 8/27/2002 12:00:37 PM]
27 August 2002, 01:53 PM
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Thanks guys
Sorry if this sounds a bit dumb, but when you say headers, if this is the bit that joins the exhaust ports on the engine block to the cat pipe before the up pipe to the turbo, then yes, that is where the probe is. It is about 3-5 inch back from the engine block itself.
900 degs is the highest it has got under hard driving, ie. full throttle through the gears...
Having not had anything like this before, I wanted to gauge how maine compared with others, both of the same car type and standard and also ones which are modded, zorsts etc. Also, when the PPP for the STi eventually breaks out of Banbury, would be nice to hear what people see then, with presumably higher if not sustained held boost...
Good to know that everything seems in order though, thanks for the input.
Cheers
Simon
Sorry if this sounds a bit dumb, but when you say headers, if this is the bit that joins the exhaust ports on the engine block to the cat pipe before the up pipe to the turbo, then yes, that is where the probe is. It is about 3-5 inch back from the engine block itself.
900 degs is the highest it has got under hard driving, ie. full throttle through the gears...
Having not had anything like this before, I wanted to gauge how maine compared with others, both of the same car type and standard and also ones which are modded, zorsts etc. Also, when the PPP for the STi eventually breaks out of Banbury, would be nice to hear what people see then, with presumably higher if not sustained held boost...
Good to know that everything seems in order though, thanks for the input.
Cheers
Simon
27 August 2002, 02:26 PM
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Hi Simon,
Mine are similar too about 850 peak when ragging the you know what out of it (used to be 925 til I fitted a new fuel pump)
An 80mph cruise on the motorway sees about 600
100mph cruise on a private road/track/autobahn
sees 700
My probe is just before the upipe and after all 4 header pipes have gone into 1
Cheers
Rich
Mine are similar too about 850 peak when ragging the you know what out of it (used to be 925 til I fitted a new fuel pump)
An 80mph cruise on the motorway sees about 600
100mph cruise on a private road/track/autobahn
sees 700My probe is just before the upipe and after all 4 header pipes have gone into 1
Cheers
Rich
27 August 2002, 02:43 PM
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Hi Rich
I fitted the gauges and probe myself, which was interesting, getting enough ground clearance to get my fat *** under the front of the car to get the thing off...
Maybe it was me not paying too much attention, but I cannot remember seeing where the header on the o/s part of the engine actually joined with the up-pipe. I do recall seeing that the n/s (which is the one I fitted mine in) header, fed what looked to be a short pipe than across the front of the car with a cat in it, but cannot remember seeing the other side.
Obviously it joins somewhere over on the o/s area, just I didn't see it Technophobe....
So mine is in the header, furthest away from the turbo.
What fuel pump have you fitted??? Have you gone for the full ECU change yet??? Must be next on the list surely!!
Cheers
Simon
I fitted the gauges and probe myself, which was interesting, getting enough ground clearance to get my fat *** under the front of the car to get the thing off...
Maybe it was me not paying too much attention, but I cannot remember seeing where the header on the o/s part of the engine actually joined with the up-pipe. I do recall seeing that the n/s (which is the one I fitted mine in) header, fed what looked to be a short pipe than across the front of the car with a cat in it, but cannot remember seeing the other side.
Obviously it joins somewhere over on the o/s area, just I didn't see it
Technophobe.... So mine is in the header, furthest away from the turbo.
What fuel pump have you fitted??? Have you gone for the full ECU change yet??? Must be next on the list surely!!
Cheers
Simon
27 August 2002, 05:11 PM
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Yep ECU is next on the list when I get the FMIC in finally.
Hoping for 350 ish bhp and a shed load of torque.
I'm using one of Mark A's (R19KET) uprated fuel pumps. Made a big difference as my old one was well past its best.
Cheers
Rich
Hoping for 350 ish bhp and a shed load of torque.
I'm using one of Mark A's (R19KET) uprated fuel pumps. Made a big difference as my old one was well past its best.
Cheers
Rich
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27 August 2002, 07:11 PM
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Hi,
I placed the EGT probe of a Defi gauge in the same place as YorkshireSimon did. This is the spot where the probe reads the highest values, there is a 50 to 70 degrees difference compared to probes placed at the uppipe- after the headers.
I used to see 830 degrees at WOT when the car was unmodded.
Now with a catless exhaust and a Link ECU I see 900 to 920 degrees at WOT. I was told that those are the highest values I should see- MY01 WRX car.
Cheers
Kostas
I placed the EGT probe of a Defi gauge in the same place as YorkshireSimon did. This is the spot where the probe reads the highest values, there is a 50 to 70 degrees difference compared to probes placed at the uppipe- after the headers.
I used to see 830 degrees at WOT when the car was unmodded.
Now with a catless exhaust and a Link ECU I see 900 to 920 degrees at WOT. I was told that those are the highest values I should see- MY01 WRX car.
Cheers
Kostas
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