2005 5.3l/4l65e combo in a Jeep. During the 1-2 shift, the tps is dropping down to 40%. Sonnex servo installed and the shift still seems to take a long time. Can someone take a look and see what I am missing please. It's shifting at the right rpm but still seems sluggish on the shift. The 2-3 shift is crisp. Am I missing something? Files and scan attached. 1-2 and 2-3 pull around the 3:09 mark.
Last edited by Dirthead Racing; 04-21-2016 at 02:38 PM.
70 Chevelle, 4L80e, 2900 stall, 02 LQ4 short block, LS3 heads/intake/injectors, Patriot extreme springs, EPS 222/230 on 112, Edelbrock 90mm TB, 85mm maf, Walbro 255
I think I found the TPS drop, the ETC limiter was at 5900. I'm still not sure if that'll correct the feel of the shift or not.
70 Chevelle, 4L80e, 2900 stall, 02 LQ4 short block, LS3 heads/intake/injectors, Patriot extreme springs, EPS 222/230 on 112, Edelbrock 90mm TB, 85mm maf, Walbro 255
With sonnax billet servo it should snap the 1-2 I will look at it when get home and see why if anything in tune. I build these and they hit pretty hard even with stock programming when used. The tm can get in the way and kill the shit when it is going to be too hard as we found out back in early ls camaros with built transmissions and stock trans programming. They would be worse off then stock with the better parts. A little tuning would fix it so will see if just missed something somewhere.
First 9 second 6th gen lt4 zl1 stock blower SHC SBE boost only.
2013 cadillac ats 2.0t Big turbo-gone
2007 tahoe 5.3 lsa blower on 14 lbs boost 6l80e swap 2009 os
2017 zl1 a10 big gulp/2 inch headers/ 9.55 lower/ e85/bigger hx /103mm tb / Synergy trunk tank and underhood kit/methanol injection with torqbyte controller and prometh pump / Jokerz performance R&D ported stock blower/ lme cnc heads /GP tuning custom cam. So far 9.30@150
I would appreciate that. I'm still not sure why it's not a super firm shift and I really don't want to do anything more with pressures than I have to. Thanks for taking the time to look.
70 Chevelle, 4L80e, 2900 stall, 02 LQ4 short block, LS3 heads/intake/injectors, Patriot extreme springs, EPS 222/230 on 112, Edelbrock 90mm TB, 85mm maf, Walbro 255
go into the shift time on 1-2 normal and performance and zero it all out. that will make it better but might not do it all so give that a try and can go from there. Also under torque converter lock up min and max change the min to 98 percent it will keep it from slipping and generate less heat when locked up makes it more on off. If the time doesnt do it then can either add pressure to it or go into the valve body and change the 1-2 accumulator spring out for a stiffer one. hopefully the shift time is enough as it is a little more aggressive then my stock 2007 tahoe.
Also your tune looks lean. It is making peak torque too early and falls off pretty quick signs of being lean plus the ltft is showing it lean. Some power to be found in the tune for sure. Just need to correct the maf using a stft ltft based change. I have it in my logs and my modded tahoe is with in 1 on trims and peak torque at 4400 right about where it should be on these motors with a stock cam. If want help there I can do that too. Make change and let me know where it is after and do a log too and see if that 6.2 comes down as that is a long shift for sure.
First 9 second 6th gen lt4 zl1 stock blower SHC SBE boost only.
2013 cadillac ats 2.0t Big turbo-gone
2007 tahoe 5.3 lsa blower on 14 lbs boost 6l80e swap 2009 os
2017 zl1 a10 big gulp/2 inch headers/ 9.55 lower/ e85/bigger hx /103mm tb / Synergy trunk tank and underhood kit/methanol injection with torqbyte controller and prometh pump / Jokerz performance R&D ported stock blower/ lme cnc heads /GP tuning custom cam. So far 9.30@150
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