EGT After The Turbo?

[wira4]

What should be the max exhaust gas temperature if the probe is plumbed after the turbo before the pistons start melting?

 

[Violater101]

Why would you want to put the EGT probe after the turbo??? I know this doesn't answer your question, I was just curious.

 

[wira4]

If you have the probe before the turbo, and if the probe melts and a bit of it breaks off, that bit wil fall/be blown into your turbine wheel and, wham, your $$$ turbo is trashed.

 

[nine5raptor]

that turbo is a huge heat sink though and I can't imagine you would get very accurate...or quickly responsive readings.

 

[L2RTSiAWD]

I only know one person on here with the EGT probe after the turbo. I forgot his user name on this board.

 

[BoostCrazy]

Yea I agree there is really no need to place the EGT probe after the turbo, but i imagine your temps would be offset about 100-200 deg C

 

[Violater101]

I don't really see that being an issue unless you get seriously HOT and then it wouldn't matter that much anyhow because your pistons would probably already be toast anyhow.

 

[TSi92]

Makes no sense putting the probe after the turbo. The turbo absorbs a lot of heat and that alone should be a reason why not to put it after the turbo. I've seen melted EGT probes and they just bend sightly, it's easy to unscrew the probe it only takes 5 minutes.

 

[salTy]

1275-1300 is about the range (1300 might be pushing it if you are a novice and running bad gas).

You can monitor EGTs after the turbo. Of course you will get lower temps and slower response from the probe the farther you go from the head and this will affect your tuning. Most people place the probe in the #1 or #2 exhaust runner and tune at higher temps. Both methods can work and both have their pros and cons but are still a supplement to your timing/knock. You could still be ahead of the rest by tuning at a lower temp and having the slightly better monitoring due to not peaking your gauge and learning knock sums. It will be in your best interest to factor in the variables that give you the temp ie; a/f, ic efficiency, etc. Ok, I'll stop before I get into a wideband O2 argument.

 

[talon400tsi]

YA you should have the probe before the turbo on the exhaust manifold , runner furthest away from fuel inlet.You also get a good response on the gauge by having the probe placed there. Usely the cylender that will melt first . Cruising at 3000rpm the egt readings are uselly around 1350 f.The max temp sould go no higher than 1650 f*. At 1650-1700*f for a extended period of time you'll start to have stuff meltting. Always it is a good idea to log the knock just to be safe.Oh ya if you've melted the probe you have already have harmed the motor...

 

[TSi92]

I say screw EGT gauges!! All they do is to make you let off the trottle and lose races. I had 1000 celcious and my lambda was telling me .8 volts wich it means about 12:1 AF ratio wich is more than safe and my timing was healthy 20+ degrees.

 

[georgeh20]

I have my egt in the #4 runner. Was my fathers mistake when he welded it. Do you think that makes much of a difference between the #1 and #4 runner? how many degrees cooler F do you think it would be?

 

[TSi92]

Not too sure but it's better to have it on the #4 runner than after the turbo. I think the hottest running cylinder is #2, for some reason mitsu decided to install the knock sensor behind the #2 cylinder.

 

[georgeh20]

so do you think a reading of around 1050f is a true reading for everyday driving if not what is a good temp for a car w/ a good a/f ratio

 

[ClutchTSI/AWD]

A buddy of mine owns a deisel shop and they allways put them after the turbos. $.o2

 

[Newlogics]

Originally posted by georgeh20
so do you think a reading of around 1050f is a true reading for everyday driving if not what is a good temp for a car w/ a good a/f ratio

For highway cruising it's way too low.

My (and seem most people's) EGSs are around 1350-1400F during 65-70mph cruise. ETGs tend to drop when you appy some throttle and boost kicks in. Then after a certain point EGTs will start climbing back up again.

By the way, does anyone else's EGT gauge sits at around 200F when car's completely cold ?

My gauge never drops to 0 (or ambient temp), it just sits at aroun 200F.