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Old 09-19-2005, 10:40 AM   #1
swalker
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2010 Obsid Black STi
ATP GT30, Jermaine tuned

Question Drivetrain question on '03 rex - gearing/clutch question

Ok, so after a couple years of owning my car, I finally get up the guts to take it down the 1320. It's stage 2 (TurboXS). I've probably had about 15 runs. On all of my 'better' runs, I never get above 96mph in 4th and I'm at/near redline.

After plenty of runs not getting above 96 in 4th I had almost convinced myself that was the max for 4th gear. The other day I was on the highway, on a nice cop-free stretch doing about 75 and just for fun and for a short distance, threw it in 4th and slammed it. Low and behold, tons of pickup (which I didn't have in the 1/4) and soon I'm just over the triple digit marker at somewhere near 6000 rpm.

My first and only thought at the moment is slipping clutch. Granted, I do have over 70K on the odometer and it is the original stocker, but I've never felt any hint of the clutch slipping.

So I guess the questions are:
1. Will the stock clutch support my setup (225WHP give or take)?
2. Is there anything else that can account for this phenomena other than a slipping clutch?
3. If the clutch is not adequate, what's a good daily driver replacement? I'm not looking for a '6-puck stage 3 time for a new tranny' clutch.

TIA
Steve
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Old 09-19-2005, 01:56 PM   #2
Samurai Jack
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1. Yes, the stock clutch is more than capable of handling 225WHP

2. Running a 1/4 mile from a dead stop and accelerating from 75 mph are 2 different things. You may just have not gotten up enough steam to go beyond 96MPH. And, if you could do it on the highway, but not on the track, why would you think the clutch was slipping? You just proved to yourself that it is not.

3. See #1
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Old 09-19-2005, 02:33 PM   #3
ride5000
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so you're saying that in the q.m. you were redlined in 4th, and you trapped <100mph?

if that's the case then yes, you need a clutch..

oem will hold just fine at that power level.
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Old 09-19-2005, 02:39 PM   #4
swalker
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Quote:
Originally Posted by ride5000
so you're saying that in the q.m. you were redlined in 4th, and you trapped <100mph?

if that's the case then yes, you need a clutch..

oem will hold just fine at that power level.
This is all I could figure but I talked to so many people (albeit not mechanics) that were just as baffled as me.

Is this just because the clutch is heating up so much more during a 1/4 mi run?
Would slipping the clutch out a little more help it to grab and possibly hang on?

If my clutch were slipping during daily driving - even spirited at highway speeds, I'd be quicker to call it a clutch. Maybe this is just the 'beginning signs' of impending doom
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Old 09-19-2005, 02:44 PM   #5
ride5000
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probably got it nice and hot during the launch. organic clutches slip more when at temp extremes--hot or cold.

slipping LESS would generate less heat and keep it grabby for longer. once the gear is engaged there should be no slipping and thus no heat.
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Old 09-19-2005, 02:50 PM   #6
swalker
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Quote:
Originally Posted by ride5000
probably got it nice and hot during the launch. organic clutches slip more when at temp extremes--hot or cold.

slipping LESS would generate less heat and keep it grabby for longer. once the gear is engaged there should be no slipping and thus no heat.
Yeah, that makes more sense at launch but every other gear is not slipped. Anyway, thanks for your input - gonna try to hit track again Friday (hopefully won't lose clutch for good). My best time was 13.9 with that 96mph trap. I just wonder what it would be if 4th grabbed
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Old 09-19-2005, 04:55 PM   #7
BVM
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On some of my more 'fun' saturday nights I noticed my clutch will start to slip a bit after 6 or so good launches. Its the heat. Its perfectly fine day to day, its only when you beat on it that it shows signs of throwing in the towel.
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