Gen 3 5.3 idle tuning help

[Alvin]

In an E38 it's 10.6Kohms. Measure from the IAT signal to a 5vref, there's no other components in the circuit that get in the way of just measuring it. The one I checked has the same reading to either 5V1 or 5V2.

I assume a Gen 3 PCM would have the same arrangement inside (except for only having a single 5V rail).

Who knows what the bias resistor is.. then you got to convert to 0-100% instead of Resistance = temp like in GEN 4+
It's a mess.

A function with natural logs might be outside the scope of this board..

[justinphillip414]

Originally I was under the impression that using the LS7 mass air flow sensor would be more practical running a higher horsepower application over stock, cuz I read somewhere a while back that using the stock mass air flow sensor would pretty much cap out around 500 horsepower. Would I be better off switching it to an LS1 mass air flow sensor? Or just keeping it stock?

[justinphillip414]

And I'm 100% green when it comes to tuning All this stuff is brand new to me. I'm one of those guys that can build a top notch motor but it when it comes to the technical stuff in the computer that's where I'm still trying to catch on

[justinphillip414]

It might have been a mixture of both my fault and the tuner who tuned my truck through email, me not giving enough information and him not asking enough questions...

[Alvin]

For that cam I would have recommenced no MAF. How is your IAT wired?

[justinphillip414]

It's ran through the MAF

[justinphillip414]

What are the odds of running an IAT sensor near the MAF to separate it from the mass air flow sensor?
I see what's going on in my log cuz my intake temperatures are running anywhere between 100? and 80? driving and it was about 75 degrees outside yesterday while I was driving

[justinphillip414]

can some confirm this injector data and tell me if i did this right? 12613412 injector on gen 3 pcm
( disregard the 42lb inj in the tune file name)

[justinphillip414]

With reg vacuum line unplugged it should be 58psi. That's the setting. When the vacuum is reconnected it'll vary.

Data is wrong.
https://forum.hptuners.com/showthrea...l=1#post803270

With that vacuum-referenced reg use the 0kPa column for all columns of IFR and Offset.

After setting that up correctly start worrying more about VE. The idle tuning comes after that.

can you confirm this injector data? (disregard the 42lb inj in the tune file name), its for the injectors 12613412 on gen 3 pcm, returnless, non refrenced