I am considering removing the clutch delay valve on my AP2 for track usage, but am curious if anyone who has done it has encountered any form of issues (on road tracks)? I heel-toe during downshifts but am slightly worried it might thrash my rear differential?

Thanks.

 

If you're heel-toeing properly, whether you have a clutch delay valve should have no effect on transmission wear. The point of the CDV is to minimize shocks to the drivetrain from big speed disparities, like when you drop the clutch, or screw up a heel-toe downshift.

 

so, if you're worried about your diff, then you might not want to remove the CDV.

 

I swapped an AP1 slave in mine. I can't say I noticed a huge difference in driving. The heavy AP2 flywheel is the bigger problem.

 

Swapped out slave cylinders and flushed clutch fluid...significant change for me as each shift is more direct. Every user has different results.

 

+1 on the flywheel being the biggest factor. Also the weak pressure plate. Simply upgrading to a higher strength pressure plate will really help. There are two local s2000 owners that have done this and I can vouch that it helped firm up everything.

 

Did the flywheel + pressure plate change help out with the clutch delay issues?

 

Why don't we back up -- what exactly are you trying to accomplish by removing the CDV? We can't say if flywheel or pressure plate changes will help with your issue when we don't know what your issue is.

 

My issue is with the rpms dropping like the clutch is slipping when I'm doing upshifts at the road courses, which seem to happen in the higher gears. I want to try to minimize that effect, if possible.

 

The CDV will cause the clutch to spin if you let it out with the engine revs too high to adequately match the wheel speed in the new gear. It is especially likely to happen if you are shifting far below redline and rev the engine to high RPM. The alternative is to have the shock of the engine matching speed with the input shaft transmitted through the transmission and differential gears (bad for those gears) to the wheels (which could break the tires loose).

It's possible that your clutch has glazed if you have slipped it a lot, and now it's easier to cause it to slip. Just a possibility, nothing that could really be diagnosed remotely.