darrinb

i have noticed latley that when driving at around 45-55 mph and then go WOT it will downsihift to 2nd right in the vtec range.....
but right after the downshift the rpms shoot up really high till like 6k for a split second then go back down to like 5.5
are my tires not gripping, or is the trans just slipping, i have no idea of whats going on, i'll try to get a video of the tach....

Nashua_Night_Hawk

no, it is normal. The tranny can "unlock" itself and rpms would shoot higher to have a torque multiply effect.

If you check any Auto CLS dyno you will see that the TQ curve will jump higher and then settle down to around 175 ft.lb of torque.

darrinb

does your car do the same??

EricL

I've noticed this in 3rd gear going up hills, where the torque converter will "unlock" and move the engine revs up towards its torque peak (I have headers, so the torque peak is at a higher RPM than in the non-header CLS.)

If it just moves up to 6k and feels like your not getting better acceleration, you might have a slipping tranny (flare). When the tranny starts to “fade”, you would probably see more and more of the slipping with the car feeling like it had a slipping clutch (poor acceleration).

If you get good acceleration during the "event" you mentioned, I think your ok.

When I was getting the "unlock" in 3rd gear (uphill), I noticed that the acceleration was "better" when the converted unlocked and moved up to 6k RPM.

YMMV

darrinb

i have headers also, it does feel like the car is hauling ass though...

jgscott

Could it be slipping from the FWD TQ Steer ? Mine pulls sideways and loses a little grip or chirps the tires sometimes.

allmotor_2000

Torque Convertor...

EricL

your're ok...

darrinb

cool..

good lookin out eric