ACT 2600 shutter?

[Clipse]

I just installed a new ACT 2600 and Streetlight flywheel. It tends to shutter lightly when the clutch engages on a downshift to 2nd and sometimes 3rd (usually when cold). It never shutters when upshifting to any gear. Could it have something to do with having a lightweight flywheel? Share your knowledge please...

 

[Slow99x]

What do you mean shutter? Is there a noise or is there an actual vibration? Lightweight flywheels can cause a noise but shouldn't cause a vibration. The flywheel may have not been machined right or was warped from the manufact. if the flywheel is new.

 

[turbo90gsx]

If you have a shudder, and the car shakes, check your tranny mounts. You may have installed them wrong. And if it continues check your tq. specs and make sure they are all correct.

 

[leet]

You need to describe this 'shudder' a little more. I run a 2600 w/ a Fidanza, so if you can get across what you are talking about, I may be able to help.

 

[Clipse]

It's a slight shake that only happens when I downshift to 2nd and sometimes 3rd. It doesn't happen if I match revs when downshifting, only if I'm completely off the throttle. The flywheel was brand new so I would think it was stepped correctly and I torqued it down to 100 ft-lbs. The pressure plate was torqued down to 25 ft-lbs.

The tranny mount makes perfect sense because there are 2 bolts that go into the tranny and 4 that go into the body. I only put 1 of the bolts that goes into the tranny back in because the 2nd one was being a b-tch and only 3 of the 4 in the body (I managed to cross thread one ).

 

[turbo90gsx]

thats probly your problem then. you should look at putting that bolt back in.

 

[Clipse]

Originally posted by turbo90gsx
thats probly your problem then. you should look at putting that bolt back in.

I'm gonna give that a shot tonight. I better get my vulgar vocab warmed up... Thanks

 

[leet]

Originally posted by Clipse
It's a slight shake that only happens when I downshift to 2nd and sometimes 3rd. It doesn't happen if I match revs when downshifting, only if I'm completely off the throttle. The flywheel was brand new so I would think it was stepped correctly and I torqued it down to 100 ft-lbs. The pressure plate was torqued down to 25 ft-lbs.

The tranny mount makes perfect sense because there are 2 bolts that go into the tranny and 4 that go into the body. I only put 1 of the bolts that goes into the tranny back in because the 2nd one was being a b-tch and only 3 of the 4 in the body (I managed to cross thread one ).

Well then of course it's going to shake. One is speeding up to match the RPMs of the other. Rev-matching is your friend. Put that bolt back in, too.

 

[Clipse]

Just to clarify, when I say tranny mount I'm speaking of the motor mount that bolts to the tranny from the body, not the bellhousing bolts that connect the tranny to the motor.