[s-cars] New clutch, and rear diff limits
yumyjager at gmail.com
Tue Oct 25 15:46:18 EDT 2005
What transmission are you running?
Also, this isn't the first V8 rear diff that I've heard of blowing on
a high HP car. It seems like it's ideal to run stock rear diff on a
high HP daily driven car. With the stock rear diff the tires spin if
there is too much power, with the V8, things go boom.
40 valves 'O plenty!
On 10/25/05, djdawson2 at aol.com <djdawson2 at aol.com> wrote:
> So I was all excited... 12.4 at 113, and it seemed very limited by the clutch's inability to deal with a competitive launch. So I called Javad (034efi) to discuss clutch options. He had a unit built by Spec that he said was good to 600ft/lbs. So I ordered away... intent on a more successful trip to the dragstrip before the season ended.
> I drove the car back from Boise to Denver on Friday night. Got up Saturday, and started in. About 6 hours later, I had my new Spec clutch in the car. Everything's going fine. Out for a test drive...
> I decided to see how this clutch would hook up under power. I tried a moderate launch first... one that the Centerforce wouldn't hold. Wow... this thing stuck like white on rice... impressive. So now I'm all excited about the potential. So I go for an aggressive launch... 6k rpm with a gentle engagement to build boost, and then let 'er go. KABOOM!! This was a sound I knew well from previous experience with other cars.
> The rear torsen diff had unloaded, to the extent that a hole was blown through the side of the case. Fortunately, I still had my original diff... so I was able to swap that back in.
> So now I'm wondering... and scared. Is this the limit of the drivetrain? Are future trips to the strip just another blown diff waiting to happen?
> Anybody with experience... please share. How do you launch? What kind of abuse have you been able to put the drivetrain through without failure?
> Keep in mind, I'm not dumping the clutch. I usually start at a higher rpm (6k'ish), let the clutch out enough to put a load on the engine so that it rapidly builds boost, and then gradually let it grab completely. When done right, you get the feeling like you are in a slingshot... and there's nothing really sudden or abrupt about it.
> And yes... Mr. Pederson has repeatedly used the term "fuse." Maybe my rear diff is now the fuse, instead of my clutch. Hey, at least it wasn't the tranny.
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