GMPP E67 525hp

[In-Tech]

Hello,
I recently worked on one of these crate engines.

Here is the stock file for reference which I believe is GM's latest rev.

I changed all of the usual desired idle stuff including the min mass air stuff, etc etc. Even though the desired idle showed what I commanded, the idle would never get below ~900rpm. I briefly checked for vacuum leaks and a few other things since it is a crate engine, found one small leak. Has anyone else seen this? The only thing that stood out was the TPS % never dropped below stock as if it had a commanded minimum. I don't have all of the information in front of me and was just playing with it for a really good customer with multiple projects. I was mainly there to help that day with fuel system issues so I figured I would look deeper at a later time.

Thoughts?

Thanks,
-Carl

[joecar]

That's the stock GM file that came with the controller for the 525hp crate engine...?

[joecar]

They take knock seriously...!!

They run PE overly rich, could probably make an extra 10-15 hp by making PE not quite so rich (assuming the IFR and MAF/VE are correct).

[joecar]

Look at GM.ETCTP instead of GM.TP.