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From Fri Oct 31 06:35:29 1997
for <>; Fri, 31 Oct 1997 06:35:21 -0800
by (8.8.4/8.8.4)
id IAA08175; Fri, 31 Oct 1997 08:32:25 -0600 (CST)
Date: Fri, 31 Oct 1997 08:32:25 -0600 (CST)
id rma008075; Fri Oct 31 08:31:49 1997
From: Charles Quarton <>
Subject: Re: Gearing
Cc:, "Carl Buckland" <>,
"Rob Levinson" <>,,
"'Anthony Springer (BMP)'" <>,
Steve Zink <>
Mime-Version: 1.0

At 10:22 PM 10/30/97 +0000, Carl Buckland wrote: >Corey H. asks some questions that I think may have general interest,
>so I will answer to the lists at large:

>> I was also thinking about getting a lightweight flywheel. I heard they

CQ answers:
Yes, the transmission rattles. It is the gears, synchros etc that are shaking because the firing pulses are not damped by the heavy flywheel. Those with an E30 M3 have experienced this.

>> Is there any company out there that sell one without those symptoms?

Carl says about the E36 M3:
>I will let others answer that question. I hear that not all drivers
>have had the rattle "problem," if it is a problem.

CQ answers:
Dinan has a lightweight flywheel and clutch that eliminates the rattle. The idle is raised to 950 and the idle circuits are tweaked in the chip. I have driven a normally aspirated car with this set up and it works the way a clutch should. The dual mass flywheel is a little vague but it does make things luxury smooth. My supercharged M3 is getting the unit installed and I will pick it up from Dinan today. I am also getting the lightweight pressure plate, more weight off, and 20% more clamping force.

The flywheel is steel which has been machined here and there for lightness. Aluminum flywheels are not as strong as steel and tend to develop cracks. So the choice was made to go for longevity and sacrifice a little on the weight gain from aluminum.

I will get to know the new flywheel better this weekend at an Open Track at Sears Point.

Chuck Quarton

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