JHM stage 4 clutch and lightweight flywheel

admin — Tue, 01 Dec 2009 06:00:13 +0000

Thanks to the guys at JHM! My stage 4 clutch and lightweight flywheel combo have made it safely to the shop. One of my concerns when I was planning out my motor mods was the ability of the OEM clutch to handle the additonal power of the supercharger; after speaking with JHM we found a perfect soultion.

Using a ceramic/kevlar clutch we've gained an extra 400 ft/lbs of clamping pressure over OEM. This clutch should have no problem handling the added power. The 13lb lightened flywheel should help with some of the parasitic loss caused by the 26lb OEM flywheel.

STaSIS 4:1 center differential

admin — Tue, 08 Jan 2008 09:16:26 +0000

After a few weeks in the shop, we installed the STaSIS 4:1 center differential on my B6 S4. The stock differential provides 2:1 torque distribution, with the modified STaSIS unit we’re able to provide 4:1 just like the B7 RS4.

I have not had a chance to take the car to an HPDE yet, but I have noticed an immediate difference coming out of the apex of a corner. Typically when you’re exiting, the car begins to under-steer; with the diff the moment you begin to under-steer the power is transferred from the front to the rear and we can neutralize some of this under-steer.

There has been no odd behavior from ESP or ABS. The only thing I’ve noticed post-diff has been some Quattro binding at low speed turning, such as in parking lots.

This modification is available for 5 and 6 speeds, manual A4/S4s.

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JHM stage 4 clutch and lightweight flywheel

STaSIS 4:1 center differential