Preturbo Egt

[chaze1385]

Is anyone running an EGT preturbo? Have my probe on top right after collector in the turbine inlet.

What kind of readings are you getting, Part throttle, wide open, cruising, interstate. Things like that.

Chad

[kenhoeve]

Probably about the same as post turbine, even with a little loss, if I had to guess. I believe Johann prescribed EGTs lower than 1300's as a benchmark so I would start there for full throttle comparisons. An A/F reading would be slightly more important to see first. After that check your radio volume.

[chaze1385]

average 1200 just puttin around town. Interstate around 1400 and wide open i pass 1600 which is as high as the gauge reads, needle points straight down so i am guessing close to 1700 or so. I even put it back to lower than stock boost, bypassed my MBC and just ran off the stock wastegate spring which got me around 7psi or so. Still super high temps. 17+psi sint any different. ANd I still run consistant 8.80-8.90's in the 1/8mile. BUt this is pre-turbo in the collector which is going to be higher. I do run a stock downpipe and Cat which i know is causing a lot of the problem.

[JHEIII874T5M]

Interesting... still on stock tune it sounds like?

I had mine post turbo (19T @ 18-20 PSI, water/meth injection, stock intercooler, custom upsolute tune, 3" catless dual turboback, etc.) and it was about 1000-1100*F while cruising around town. On the highway at 75-80 MPH about 1200*F and while WOT it would peak about 1400*F. My a/f's were in the 11.8-12.4 range.

[stick70]

mines post turbo and are around 650*C at ~65/70 mph wot around 750*C. If someone would conver that to *F that would be great

[Fudge_Brownie]

mines post turbo and are around 650*C at ~65/70 mph wot around 750*C. If someone would conver that to *F that would be great

http://i88.photobucket.com/albums/k191/s70t5m98/DSC02633.jpg

1202F

1382F

[Zappo]

Mine is pre-turbo in the manifold at the collection point. I don't pay too much attention to it anymore, but I will post numbers later. Fairly sure around town I would max at 1200, but normally less than that.

[chaze1385]

I can put my boost back lower than stock. Just running off the wastegate spring. Which is 6 or so and still hit 1400+. Just cruising down the interstate at 70mph no boost at all 1400+. Put it in the floor swings past 1600 whish is high as it reads, then straight down to what I figure is 1700-1800. Let off and quickly drops. Narrowband air/fuel gauge reading in the green the entire time. Till i let off then it starts cycling again. No knock that i can hear anyway. Plugs look fine after a hard blast, immediately stopping and checking them. Even tried another EGT gauge reads the same.

I think a lot of it is the downpipe and stock cat. I did hook an old boost gauge up to the extra O2 sensor bung in the stock DP. And wide open to 100+ mph, boost at 17psi. The boost in the downpipe was reading 20-25psi. Bad, bad, bad. Need to get off my butt and make a downpipe. Have had everything to do it for months now. Sell my stock cat on ebay for scrap.

I am going to run a Rising Rate FMU, probably a 2-1 cartech, and larger injectors. Basically run a lower base pressure so it wont be so rich at idle and cruising, then the 2-1 ratio should give me all i need. I also got my dual feed fuel rail all lined out. Should work good. Dont know if will help but i dont think it will hurt either.

CHad

[Auburn T5]

Need someone to do a stock t5 manifold temp at WOT vs the R mani at WOT to see what difference it makes.

Along with stock exhaust vs 3" DP + catback

[drjonez]

In my experience on other vehicles (imports, etc.), you'll see random numbers while doing city driving....due to the mixture being all over the place. At cruise, the ECU is going to lean way out....so you'll see anywhere from 1400 – 1700+F depending on how lean the car is set to run. WOT will also be all over the place due to level of tune....my rule of thumb was never over 1600F or so. But then again, this was all years ago before the advent of cheap WBs….IMNSHO an EGT should be the last gauge you add now, get a good WB first!

Another thing to remember is that EGT increases as the mixture goes lean….up to a point, then it starts DECREASING. Which is why tuning based on EGT is a bit difficult.

Post-turbine EGT measurement is a complete waste of time. Due to the nature of how a turbo works, the amount of heat the turbine removes from the exhaust stream is NOT a constant….it varies with shaft speed, mixture and RPM.

[stick70]

Need someone to do a stock t5 manifold temp at WOT vs the R mani at WOT to see what difference it makes.

Along with stock exhaust vs 3" DP + catback

ill be able to help you out with that if i ever get a downpipe lol.

as for post turbine, meh. Id still rather have it than not if for no other reason than its another reference. And theres no way im drilling the manifold on my dd. probe failure ftl

[drjonez]

...as for post turbine, meh. Id still rather have it than not if for no other reason than its another reference. And theres no way im drilling the manifold on my dd. probe failure ftl

Sure, probe failure is a concern.....but how often does it happen? Not very. I personally prefer some useful readings vs. worrying about the possibility of impending doom....