Has anyone else noticed that the LMM timing is way off from what is commanded. I did some logging, the tune is pretty much just a stock tune with JoshH's 50/50 calculator applied to it and while reviewing the log I noticed that the values are alot higher than in the tune. There are still tables that we need to accurately tune. Anyone else that is tuning an LMM, what have you found?

mine are right on

Please elaborate on your testing conditions. Were your IAT's and engine coolant temperature in a reasonable place? Which timing tables did you apply your changes to?

If you want to post the tune up, I'll take a look.

Nick

I get an invalid file error....I'll e-mail in to you

Are you using the correct GM. PIDs and not SAE.? Youll get some really screwy numbers if you are using some of the SAE standard PIDs... not sure if this applies to what you are logging though.

Yup, PID GM.MNINJTIM (Main Injection Timing).

It's an IAT issue. The IAT timing correction table is adding in .7 and 2.5 degrees of extra timing depending on RPM. As soon as the IAT's exceed 59*F, these adders are multiplied out to zero.

You have a couple of options at this point: You can compensate, set your max timing table to match your timing table, or avoid ambient temperatures under 59*F :)

Nick

It's an IAT issue. The IAT timing correction table is adding in .7 and 2.5 degrees of extra timing depending on RPM. As soon as the IAT's exceed 59*F, these adders are multiplied out to zero.

You have a couple of options at this point: You can compensate, set your max timing table to match your timing table, or avoid ambient temperatures under 59*F :)

Nick
you are the man...I would love to avoid temps below 59*, but I don't see that happening:damnit1: so I will do the other fix