Hey guys,
I like several others am trying to tune my '96 LT1 Camaro with a 24X EFI connection. I would like to start of list of things that need to be changed from an '01-'02 F-body tune. From what I've seen of the tunes posted, I think there are some things missing. This list will ignore obvious engine/cam specifics that should be set with a WB and focus on those things that are LS1 --> LT1 specific.
ENGINE - GENERAL
Cylinder Vol. (may vary)
Tach Output (from 6 to 3)
ENGINE - IDLE
IAC
The LT1 IAC is different than the LS1. From what I've logged, it only works 0-200. So tune accordingly.
IAC (LS1 range is 0-310, 365max and LT1 is 0-160, 255 max) [can we see the MAX number in HPTuners? Now we can. Thanks HPTuners!]
IAC reset position (160 is working well for me)
IAC Steps vs Effective Area (thinking this will need to be redone completely)
Desired IAC area Max (???)
ENGINE - AIRFLOW
MAF airflow (I think the physical MAF is the same. Tune your MAF. Its a good idea anyway.)
VE tables (will vary. Tune your VE tables)
ENGINE - FUEL
Injector bank select (A, D, F, G = 0 B, C, E, H = 1)
Injector Timing (LS1 stock program has earlier injector timing than the LT1. Look at the thread below and use the EOIT spreadsheet to calculate the right value for your cam. I'm running Boundary = 7.1 stock normal and makeup for now)
http://www.hptuners.com/forum/showth...ereencing-what
Injector Flow Rate (set to flat value for your injectors, not the varying LS1 style)
After start enrichment - the LT1 requires less cold start fuel than the LS1. My first stab I cut the Initial Adder table in half. Seems like a good start. Haven't changed it from the cut in half value. Working well.
ENGINE - SPARK
Spark tables - Lots of changes here. Hard to correlate the LT1 tables to the LS1 since the LT1 uses MAP vs RPM and the LS1 uses Cyl Airmass vs RPM. (Use L31 van tables?) [MikeOD suggestion below] {Van tables not really all that good either. Some tuning will be required here}
Best bet appears to be a knock sensor from a 2002 Express Van 5.7L knock sensor -- 10456288 . I then plan to start with the express van knock tables.
ENGINE DIAG
???
TRANS
Need help from the auto guys here as I have an M6.
FUEL SYS
Sender - Some have reported odd fuel gauge behavior. I bent my float when I installed the 255lph pump so mine has read strangely since before the 411 swap
I'm sure this list is far from complete, but if we put all our lists together in one place it should help all of us and those that follow.
Thanks,
Jason