Thread: Max. EGT and probe position

Originally Posted by rar110

Thanks all for the replies. The probe is fitted post turbo. I was aware most on here suggested pre turbo. However anyone in the industry here didn't want to fit pre turbo. In the end I went with the advice of a isuzu truck specialist who did a great job on the motor and he fitted post turbo. The motor is running smoother and quieter than ever.

Anyway the guage was set for F. I changed it to C. I managed to get it to 400 degrees on a steep hill. I have set the alarm at 700 degrees. I am wondering if the max temp in the isuzu manual referred to by Murray is measured pre or post turbo. It was not hard to get to 400 degrees.

I run mine post....will be fitting pre on the next though, but I have mine set at 500c, as if I maintain that temp.....only by towing 3+ton and hiting huge hills, it will lift engine temp


700 degrees C post turbo, you won't need you alarm, maybe a quick flick, but maintain it and it will be yucky

To put it into perspective.
On a flat road at 100km/h mine runs ~430C preturbo. This is 9psi boost, 2000rpm.
Temp drop across a turbo is a complete guessing game. It changes with EGT, boost and volume flow.

Get yourself a drill and pipe tap and move it. I can show you where mine is as my manifold was originally the same. It's had it's neck cut and flipped, but it's still relevant.

Originally Posted by rijidij

reading the Isuzu workshop manual, the "maximum allowable temperature measured at turbocharger intake", is 750 degrees. (see below)

Going by what the manual states turbo intake is pre-turbo.

Rob W

Originally Posted by Dougal

To put it into perspective.
On a flat road at 100km/h mine runs ~430C preturbo. This is 9psi boost, 2000rpm.
Temp drop across a turbo is a complete guessing game. It changes with EGT, boost and volume flow.

Get yourself a drill and pipe tap and move it. I can show you where mine is as my manifold was originally the same. It's had it's neck cut and flipped, but it's still relevant.

I tell you what thats about spot on to my set up with 35's on 4:11's

Add another 50 deg with the trailer on

Justin