Ok, First off my Ltrims are negetive ( -9 to -15) and in PE my AFR is Low 10s below 3500rpm and drifts gradually up to 11.2 at 5700rpm shift point, Where is the best place to start for tuning this. Should I adjust my IFR? My commanded AFR is correct however my actuall is very rich. I am not sure where to start with this? any input?
04 Sierra Denali,370,S485B, Built 4L80E, 3barOLSD, E85
NEVER ADJUST THE IFR UNLESS YOU SWAP INJECTORS!!!!!!
May want to go through the writeups, sounds like they will help you out a good bit. To answer the question though, commanded will always be correct, and actual will be off due to the VE being incorrect, MAF being incorrect, or both.
Sulski Performance Tuning
2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB
Well I am running 43lb Injectors.
04 Sierra Denali,370,S485B, Built 4L80E, 3barOLSD, E85
My IFR table pretty much matches what I came up with on one of Redhardsupra's spreadsheets, I know how to tune the VE table however it is the MAF table I am not sure of. I have been looking at speadsheets and such however still not quite sure how.
04 Sierra Denali,370,S485B, Built 4L80E, 3barOLSD, E85
dont use spead sheets for anything but the IFR. I gave Marcin that sheet a while back and he hosed it on his site. It works well, just copy the injecotor values from there over to your tune and then everything else you can do with histograms. Just log AFR error vs MAF frequency and it will give you the % to change the MAF calibration, very simple.
Sulski Performance Tuning
2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB
I do not have the Pro versian so I cannot log my Wideband, so will I still be able to log the AFR Error? Unless I am missing somthing it seems to me that I would not be able too.
04 Sierra Denali,370,S485B, Built 4L80E, 3barOLSD, E85
By all means please tell me that I am wrong...
04 Sierra Denali,370,S485B, Built 4L80E, 3barOLSD, E85
you cannot log AFR error then. You will have to go by fuel trims, I would recommend getting a wideband and setting it up some way to log.
Sulski Performance Tuning
2000 WS6 M6 - LS6 (long block, refreshed top end), 10.8:1 CR, 90 mm ported FAST, Exo-Skel, 227/232 cam, QTP HVMC, EWP, GMMG, 9" w/4.11s
2018 Sierra SLT 5.3L A8 - Airaid intake tube, GM Borla catback, L86 Intake/Ported TB
I have a wideband I just dont have the MPVI Pro to log it
04 Sierra Denali,370,S485B, Built 4L80E, 3barOLSD, E85
This should help you get started:
http://www.hptuners.com/forum/showth...2040#post52040
Best regards,
Bill
Silver 2003 C5 roadster, M6, Euro red/amber tails, Z06 Ti mufflers, Z06 2 cat H-pipe, Z06 airbox, and HPTuners s/w - available to any Corvette or other GM vehicle in Calgary, and also for Ford and Dodge products, including Cummins
Will this still work being that I have no EGR? Is the wiring still there?
04 Sierra Denali,370,S485B, Built 4L80E, 3barOLSD, E85
I don't know, however an alternative is to use the AC sensor as the input. A search should find the relevant post. Personally, I'd upgrade to the Pro version with the EIO. I did.
Best regards,
Bill
Silver 2003 C5 roadster, M6, Euro red/amber tails, Z06 Ti mufflers, Z06 2 cat H-pipe, Z06 airbox, and HPTuners s/w - available to any Corvette or other GM vehicle in Calgary, and also for Ford and Dodge products, including Cummins
Reply With Quote