Headers adjustment questions
Recently I got a set of headers installed for my TB I6 since they just came out. Ive searched through the forum looking what to adjust on my tune for headers and have found no answer. What do i need to adjust for the headers inorder to get better performance out of them? Thanks
2002 4.2L I6 Trailblazer LTZ
Try an AutoVE... and then log some MAF BEN's and LTFT's to see what's going on.
when finding Main VE the Trailblazer has 4 VE tables. Which one is the Main VE?
2002 4.2L I6 Trailblazer LTZ
Hmmm... good one...
My guess is you would have to find the boundaries at which the various tables become active...
and then set you BEN filter to exclude any data outside those boundaries...
Its tricky, on the P10 we have 2 low VE tables table goes from 0-3800rpms, high RPM table goes from 3800-7000rpms and idle goes from 400-1600rpms. Idle is active when the PCM commands and idle condition (so deceleration I believe), low and high RPM tables are self-explanatory. No idea what the 2 fire low VE table does as Ive never seen that occur, GM has both low VE tables set the same from the factory so I just mirror the low VE single fire into the 2 fire table.
Also, we cant AutoVE because our SAE.LOAD_PCT outputs ridiculous values and is obviously incorrectly reported and GM.AFR doesnt exist (GM.AFR_B does but is invalid). So we can get a reported WBO2 value but no commanded AFR from the PCM to compare it against. Cant dial the VE table without the LOAD_PCT PID either. So yea, kinda SOL right now for anymore fine tuning the P10s. Im either running 13.9-14.2 or 14.9-15.2 under cruise and cant figure out which cells I need to adjust because I cant get valid data.
No MAF, P10s are hybrid alpha-n/Speed Density mode which makes VE tuning difficult.
~Erik~
2013 Sonic RS Manual - 1.4L I4T E78, tuned, turbo mods, etc.
2008 TrailBlazer SS 3SS AWD Summit White - LS2 E67/T42, bolt ons, suspension, etc.
2002 Chevy TrailBlazer LT 4X4 Summit White - 4.2L I6 P10, lifted, wheels, etc.
Erik , try targeting the 20 to 30 kPa cells from 1200 to 2400 for the cruise .
2005 1500 HD , Custom OS3 SD tune .
2006 Trailblazer
Dinosaurs and Plants gave their lives so that we may drive , long live fossil fuel .
well i just did my first ever log based on the tutorial guide. Let me know what you think.
VE Log Data.efi
2002 4.2L I6 Trailblazer LTZ
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2002 4.2L I6 Trailblazer LTZ
2002 4.2L I6 Trailblazer LTZ
2002 4.2L I6 Trailblazer LTZ
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