I just had an Auto meter pyro gauge installed at a GM dealer and the tech installed the probe just behind the turbo,as per auto meter instructions, and when the motar has warmed up and is idelling, my gauge reads around 300 degrees. My question is , what are the EGT readings on the gauges that the probes are installed in the manifold. I want to know if this a normal temp reading ,or do I have to add degrees to this as I have read in other threads
Thanks for any help,:)

Yes, there is big difference in readings in the pre and post turbo locations. I installed mine post turbo as well. Maybe I'm a wuss, but had a bad feeling about drilling the manifold pre-turbo.

I believe the general rule of thumb on this, and the one I follow is that you need to had 300-400 degrees to the readings from a post turbo sensor.

I have seen 950 degrees post turbo pulling my trailer up long hills, and just sitting and idling, maybe 240-300 degrees.

I'm giving thought to either moving my probe pre-turbo, or installing a second gage pre-turbo.

This may be a stupid question, so feel free to laugh and point ):h , but when the pyro is installed directly in the manifold, doesn't that mean it would be running just slightly hotter than what is actually going into the turbo? And, not sure if it makes a difference but your only monitoring one side of the engine...which may not really make a difference I suppose, but is there any place to mount the thermometer directly in front of the turbo where the air is coming in????

Someone please educate me.....:help2:

J-HEFF

The EGT temperature will vary depending on load and ambient temperature post turbo. Most accurate EGT temp sensing is in the exhaust manifold pre turbo.It's the turbo you are trying to protect.Post turbo readings are after the fact and intercooler skewed.

Nonetheless you should be aware there is no consistent add on temp to be accurate enough to depend on when to back out of the throttle post turbo but you will have a fairly close idea where your at.This only really matters when your really upping your fuel intake in bigger HP programs.

At idle (no load) it will not matter and 250/300 is the norm,post and pre turbo.

I would think the purpose of adding an EGT gauge is to read the "just" burned exhaust temperature that is leaving the cylinder. I raced snowmobiles for a number of years and we heavily relied on those readings to tell us when the pistons where getting ready to melt! We always ran them as lean as we could and tryed to keep EGT temps as 1300. Seems to me that in this situation, the best place to locate the probe is in the exhaust manifold where all four cylinders merge.

No problem installing in the manifold pre turbo - where it should be - just leave the engine idleing during drillin & tapping the hole, nothing gets in the turbo/system.

Use the "hoot method".

this needs to be on the manifold PRE turbo. any other place and your turbo could burn up before you even know about it and your gauge still reads normal.

the manifold is a soft metal and takes like 30 minutes total to drill and tap, remove fender insert,etc , very easy and straight forward.

Just did the install myself using the "hoot" method and they are right. It took longer to remove the wheel liner than to drill, tap and install the pyro.

Go for it!
Michael

Cruising at 85 MPH up Vantage hill, full stack at 10PSI compounded...... 580F

wow!