Harsh 6-5 and 5-4 closed throttle and light throttle downshifts. - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 6 (permalink) Old 07-06-2014, 10:48 PM Thread Starter
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Harsh 6-5 and 5-4 closed throttle and light throttle downshifts.

Hey, thought I'd throw this out here before I go drop another $400+ on a dyno/street tune. My current trans tune has a strange 6-5 5-4 downshift thing going on. It's at closed or light throttle. It will rev match even in drive for this two downshifts, then it bangs into gear pretty hard after the rev match. I don't quite get what's going on with it, as it's not supposed to rev match in drive. If I turn ct tq management off, it doesn't match, but it's still kinda bangs into gear. I don't want tq management off anyway. I can email my tune to anyone that's willing to look at it for me, but I don't think the tuner would appreciate it being posted up on the board.

And it only does it in those gears. If I don't let it get out of 4'th, the downshifts are smooth as butter.
Thanks,
Jon

2009 G8 GT. MSM.
Go: P1SC. Wiseco Pistons. Lunati H beams. Alkycontrol meth injection. Lunati cam.
RCR H, I, Tb. Kooks Lt. Solo 3". ls7 MAF. CTS-V pump. ID850 injectors. ATI balancer. 3.27 gears. Yank SS3200. B&M trans cooler. Tuned by Pat G.
Suspension: Poly strut bushings. BMR front and rear sway bars & trailing arms. Poly diff bushings.
Show: Shark fin. Gxp rear diffuser. Tint. Debadged.
Electronics: Aeroforce gauges. Escort 9500ix. Onstar bluetooth. Home link. Backup camera.

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post #2 of 6 (permalink) Old 07-07-2014, 12:15 AM Thread Starter
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This maybe better suited in the tuning section. Mods please move if you feel it's best.

2009 G8 GT. MSM.
Go: P1SC. Wiseco Pistons. Lunati H beams. Alkycontrol meth injection. Lunati cam.
RCR H, I, Tb. Kooks Lt. Solo 3". ls7 MAF. CTS-V pump. ID850 injectors. ATI balancer. 3.27 gears. Yank SS3200. B&M trans cooler. Tuned by Pat G.
Suspension: Poly strut bushings. BMR front and rear sway bars & trailing arms. Poly diff bushings.
Show: Shark fin. Gxp rear diffuser. Tint. Debadged.
Electronics: Aeroforce gauges. Escort 9500ix. Onstar bluetooth. Home link. Backup camera.

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post #3 of 6 (permalink) Old 07-07-2014, 12:24 AM
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Maybe the downshift times are too short

NEW- 2009 PSM GT- 0.020" over/ Vararam/ RCR 223/232 cam/ Kooks 1 7/8" LT/ 3" exhaust/ 3200 Yank/ 3.45 gears/ HPT self-tune

SOLD- 2008 LR G8 GT /
Intake / HPT self-tune / E85 / 160* stat / Kooks mids / Dynomax ST axlebacks / Xpipe / 219/233 Comp Cam

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post #4 of 6 (permalink) Old 07-07-2014, 12:54 AM Thread Starter
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I'll take a look at them. We have very similar builds minus the nos. Would you mind taking a peek at it?

2009 G8 GT. MSM.
Go: P1SC. Wiseco Pistons. Lunati H beams. Alkycontrol meth injection. Lunati cam.
RCR H, I, Tb. Kooks Lt. Solo 3". ls7 MAF. CTS-V pump. ID850 injectors. ATI balancer. 3.27 gears. Yank SS3200. B&M trans cooler. Tuned by Pat G.
Suspension: Poly strut bushings. BMR front and rear sway bars & trailing arms. Poly diff bushings.
Show: Shark fin. Gxp rear diffuser. Tint. Debadged.
Electronics: Aeroforce gauges. Escort 9500ix. Onstar bluetooth. Home link. Backup camera.

Morphs is offline  
post #5 of 6 (permalink) Old 07-08-2014, 11:40 AM
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It is the torque converter locking.....

2009 G8 GT- Rick Crawford
1.50 60ft, 10.41 @ 131.4 Comp 234/243 111+0 6.4 N/A
1.53 60ft, [email protected] 129.7 ALL MOTOR!!! N/A G8 Record Holder
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post #6 of 6 (permalink) Old 07-08-2014, 11:52 AM
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All you have to do is raise the 4th and 5th mph lockup setting so they don't apply at normal driving. You have your 5th and 6th shift point pretty high so when it downshifts, it is in the window for lockup. Welcome to having a stall. Lockup is the downside of a stall, you never notice it with a stock converter since they don't need to lock 100% but you can't slip a stall clutch unless you feel replacing the trans and converter in a few thousand miles....

2009 G8 GT- Rick Crawford
1.50 60ft, 10.41 @ 131.4 Comp 234/243 111+0 6.4 N/A
1.53 60ft, [email protected] 129.7 ALL MOTOR!!! N/A G8 Record Holder
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