jimmyp3353

iTrader: (3)

Just installed a Circle D converter in my G8 GT and I noticed when cruising with my foot on the gas at say 45 with the converter locked the RPM's will jump about 200-300 rpm then come back down every few seconds. It's almost like the torque converter is unlocking then locking quickly. Normal?

FirstYrLS1Z

iTrader: (4)

what does it do at 5-10 mph higher ?

Circle-D_Brian

You need to check your desired slip in the tune. Zero this out. If you have any questions give us a call .

-Brian

Circle-D_Brian

Screen shot below of HP Tuners. Everything in the yellow box is supposed to be set to 0.

-Brian

jimmyp3353

iTrader: (3)

Just talked to the speed shop/tuner and they said that it is very common for the 6L80 6 speed auto to surge a bit with an aggressive stall. Very reputable shop that is a sponsor on a lot of LS sites.

jimmyp3353

iTrader: (3)

they are 0

jimmyp3353

iTrader: (3)

haven't cruised in it over 45mph. Drove the car home from the shop in sub 0 temps yesterday.

Circle-D_Brian

That much slip make me nervous. It could damage the clutch/clutches. We have seen the desired slip tables zeroed out and had the car behave otherwise. I would have your tuner monitor actual slip in real time. That will give us a better understanding of what may be going on.

-Brian

jimmyp3353

iTrader: (3)

No slipping. Just torque converter locking and unlocking.

JKB315

iTrader: (9)

Good thread. My stall is doing the same thing when it locks up. It's annoying . Going to see about getting a better tune.

Circle-D

iTrader: (21)

Log it and see if the slip RPM is going up and down, 0-200 range. If so it sounds like the desired slip tables did not flash correctly in the tune. I have seen a few occasion where even though it says the tables are zero, they are not. The fix was a completer re-write with a GM MDI.

Chris

peteggl

My 4l60e does the same thing with a PTC 4000 stall anywhere from 45-55 mph but never above or below