EGT temp readings, how hot is to hot?

[Vallary99]

So, my argument says that placement is critical. I believe it goes before the turbine. How do you establish what is "right" for your car when a maximum EGt you will see in the downpipe is something like 1200-1300? The turbo is going to consume 200-500*F in enthalpy, depending on how efficient it is. So what is the inlet side really reading?

Those of you who take your cars on the roadcourse will also notice things that your 1/4 mile friends do not. You can tune a car to top out at the top of fourth in the 1/4-mile and just see 1600*F. Take that same car to the road course and stand on it down the back stretch. You will find that you will have to run richer to keep EGT's down.

One more thing. Unless you are watching timing, EGT (or TIT) is worthless. If your engine starts to knock a bit and your ECU pulls timing, you are going to dump a ton of fuel out your exhaust due to that retarded timing. Inside, you engine will stay nice and cool, but your EGT will skyrocket. So, if you are getting real high EGT number, look at what your timing is doing before determining that you have a real big problem. It could be that you just are getting your timing pulled.

Ok I agree with that. Then the best place to put it is right before the turbo where all the runners meet, not on a particular runner.

 

[eclipsegsx1736]

One more thing. Unless you are watching timing, EGT (or TIT) is worthless. If your engine starts to knock a bit and your ECU pulls timing, you are going to dump a ton of fuel out your exhaust due to that retarded timing. Inside, you engine will stay nice and cool, but your EGT will skyrocket. So, if you are getting real high EGT number, look at what your timing is doing before determining that you have a real big problem. It could be that you just are getting your timing pulled.

That's exactly what I use the EGT for. If I do a pull and see the EGT go higher than usual, I check the log and always see timing pull to match the extra-high EGTs. It also gives me an early warning of a bad log, before it's over, so I can let off, although I can almost always feel it when timing is pulled. I think a good idea for road racing is to tune, say, for 16 psi, maybe a little on the rich side, and then on the track run around 13 psi. That's what I'm doing for my next RR session.

 

[Lordpaxin]

After welded on a bung to the backside of my manifold, i then saw that I cannot put my turbo bolts in!!!!!! what a dumhead ahahha...


I am going to relocate it to the 02 housing tommarow, so the probe will stick into the wastegate passage. though i am
(ext gated)