Envoy Tuning?
me too!
12-23-2007, 09:54 AM
#17
02-05 trailblazers and envoys don't use a MAF, 06 and newer do. I have an 05 Trailblazer 4x4 with 3.42's and with a tune only I went from 16.1 to 15.3's. I have EFILive, I really wish I could post my tune up so you could see. In a nutshell though, the I6's already have knock from the factory, I left my timing stock cause my wife drives the TB more than me and she puts 87 in it. With 93 you may get away with a couple more degrees in the High octane PE table. The tps only reads 87% at WOT, thats just all it opens, mine is that way too. Next my PE modifiers were setup a bit lean on the low end and rich on the top end, I set my AFR (used my wideband), to 12.6-12.7 low and mid-range tapering up to 12.9ish past about 5000 rpms. I also changed the VVT cam position in PE mode and noticed some low end improvments, I had to lower those values rather than raise them. In that table, 0 is in the fully advanced position and numbers above 0 are retarding the cam. I played with with part throttle timing and helped milage some as well. I raised my rev limiter to 6700 I believe and removed the speed limiter (have had this big pig to 130).
Moving on to the transmission, I raised the base pressure some, 0'd out Tq mgt. I raised my shift vc. rpm for WOT to about 6400 1-2 and 6500 2-3.
Maybe that will help some!
Ryan
Moving on to the transmission, I raised the base pressure some, 0'd out Tq mgt. I raised my shift vc. rpm for WOT to about 6400 1-2 and 6500 2-3.
Maybe that will help some!
Ryan
12-23-2007, 11:01 AM
#18
It does explain why I cant find a MAF, lol. This is the wife's ride too and she doesn't want to run premium either.
I went ahead and raised Base shift pressures 15% across the board...is that enough/too much to change at a time?
Zero'd out Trans Abuse Mode Torque Reduction vs RPM tables (Abuse mode is disabled from factory)
Set the Torque Reduction Duration table to .08 across the board.
Zeroed out the Torque reduction vs Torque vs Shift-Normal (performance is zeroed from factory)
As far as the Rev limiter, I brought the Fuel cutoff RPM up to 6700 and the Fuel Resume up to 6100. I left the Fuel Resume RPM -excessive alone. Not sure about that one.
Dont have a WB for the envoy...how's these for starters?
thanks Ryan.
I went ahead and raised Base shift pressures 15% across the board...is that enough/too much to change at a time?
Zero'd out Trans Abuse Mode Torque Reduction vs RPM tables (Abuse mode is disabled from factory)
Set the Torque Reduction Duration table to .08 across the board.
Zeroed out the Torque reduction vs Torque vs Shift-Normal (performance is zeroed from factory)
As far as the Rev limiter, I brought the Fuel cutoff RPM up to 6700 and the Fuel Resume up to 6100. I left the Fuel Resume RPM -excessive alone. Not sure about that one.
Dont have a WB for the envoy...how's these for starters?
thanks Ryan.
12-23-2007, 11:12 AM
#19
Good, and I also 0'd out my shift times. On the shift pressure your fine, but on the low end of the table where the downshifts occur when coming to a stop it might be a little jerky, you may have to reduce the pressure some there. Let me know how it goes!
Ryan
Ryan