4.8 Hot Start and Fuel Trims / VVE

[DanN]

Losing my marbles a tiny bit. I've been chasing my tail for quite a while now, and I think I must be missing something basic.

I have a 4.8 with the "low buck truck" cam: Lift .552/.552, Dur @.050 212/22X, LSA 107 Deg. I have a TBSS intake with the flex fuel injectors.

I have reverted to my starting point, and have attached it with a basic idle log and a hot start log.

I have been trying to follow Cringer's method, but my LTFT and my charts don't seem to jive.

I am logging lambda from the AC input with this math: ((([7101.10]/0.5)+10)/14.7)

I could use a leg up.. feeling pretty defeated at the moment.

[LS ROB]

I'd get the part number off of the injectors and make sure you have the correct data in the tune for the injectors you have. Have you done any VVE tuning yet?

[DanN]

I'd get the part number off of the injectors and make sure you have the correct data in the tune for the injectors you have. Have you done any VVE tuning yet?

Just checked my Injector data - it got changed somewhere along the line. Updating...

Haven't tried VVE tuning. Call me chicken. Ha.

[DanN]

Updated tune with corrected injector data, and a quick around the block log. It is definitely better.

I'm reluctant to fiddle with the VVE table until I'm a little more confident my data isn't garbage.

[RDF1]

Whats your injector part number?

[LS ROB]

Add cylinder airmass to your channels.

[DanN]

Whats your injector part number?

They are 12594512, which are listed as 38# for a 5.3 w/ flex fuel.

Add cylinder airmass to your channels.

Will do.

[DanN]

Fresh copies of the tune and log.

[RDF1]

They are 12594512, which are listed as 38# for a 5.3 w/ flex fuel.



Will do.

Here is LMG injector data.