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Old 12-03-2004, 13:43   #1 (permalink)
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clutch problems-1/4 time

have bad slipping from my clutch ,with only 88,000km on the clock
which setup will suit best for my EF XR8 with 204rwkw am only getting best 15.20second 1/4 mile(each run got worse) has a 3.23diff -will be increasing power closer to the 250rwkw soon as bank allows- would think low 14s with good heavy duty clutch will a heavy duty be fine once increased to 250rwkw(hopeful in the 13s)
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Old 12-03-2004, 16:49   #2 (permalink)
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Re: clutch problems-1/4 time

EF should have had a 3.45 diff? If it is 3.23, I would drop it to 3.45 or 3.73. This should improve times, and protect the box. You are already right on the limit for that gearbox, I would not expect to get 250 rwkw through it for very long at all>
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Old 12-05-2004, 14:58   #3 (permalink)
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Re: clutch problems-1/4 time

EF has the BW T5 ... any more kW and you will break stuff

look into the AU/BA Tremec5, the BA Tremec56, or if for basically the same money Tremec TKO 500 and TKO 600. the last two definately will handly your application.

as for your diff i am pretty sue it should be a 3.45, unless somebody threw and old diff center into it, which i couldnt see why, but if you consider upgrading you diff look into a 3.7 or 3.9 center from the skylines R31 and VL commies.

I have a 3.7 LSD and it awsome, the 3.7 center matches the Tremec5 very well in relation totransmission gearing. I only gained 100rpm at 100km in 5th gear over my old setup

as for clutch, there are several options i have come across, the AU XR8 clutch is a fairly good clutch, and teh cheapest of the performance clutches, complete assembly cost me $500, next was a single high performance clutch kit (i forgot the name) for $800 and last was a custom build twin clutch setup from bissy for 2g, comes with custom flywheel, pressure plate etc
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Old 12-05-2004, 15:00   #4 (permalink)
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Re: clutch problems-1/4 time

oh and you should definetaly run into the 14s if not further, if i get it managed to run a 15flat with pissy 139kW at treads (dont put too much weight on those performance figures of mine)
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Old 12-06-2004, 01:52   #5 (permalink)
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Re: clutch problems-1/4 time

An EF with genuine 204rwkw would get you into the low 14's easily. Think about it thats XR6-T power in a car thats 1500kg odd.

Depends how gentle you are with the gearbox and avoid full rev dumps will prolong the transmission.
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Old 12-06-2004, 02:08   #6 (permalink)
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Re: clutch problems-1/4 time

As stated already.. I would be looking at a new gearbox to handle that sort of power.
But in the mean time if you have 204 RwKw then you should be looking at running a twin plate clutch assembly. I got mine from Mal Wood in Qld.

With 204 RwKw you should already be into the 13sec bracket on the 1/4.
I currently have around 212RwKw and have run a best of 13.485 so far.... this time also has room for improvement.
A change in diff ratio will also help you out with better times.

What Mph are you currently clocking across the line??
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Old 12-06-2004, 04:25   #7 (permalink)
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Re: clutch problems-1/4 time

FUSE: twon plate clutch is not always teh best solution for 250kW i would say there are still quite a few single plate options available which will have more driveability than teh twin plate. with the twin plate i would be looking at 300kW or more and you loose a lot of driveability
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Old 12-06-2004, 13:27   #8 (permalink)
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Re: clutch problems-1/4 time

Quote:
Originally Posted by EvilChief
FUSE: twon plate clutch is not always teh best solution for 250kW i would say there are still quite a few single plate options available which will have more driveability than teh twin plate. with the twin plate i would be looking at 300kW or more and you loose a lot of driveability
Your experience based on?
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Old 12-06-2004, 14:27   #9 (permalink)
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Re: clutch problems-1/4 time

204 should put you in the 13's. What have you done to the car?

I have an Automatic EB and ran a 13.6 at 105mph with 202rwkw. I have a 3.23 single spinner. Get the clutch sorted and you will be in the 13's easy.
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Old 12-06-2004, 23:01   #10 (permalink)
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Re: clutch problems-1/4 time

Quote:
Originally Posted by EvilChief
with the twin plate i would be looking at 300kW or more and you loose a lot of driveability
Ok, there may be some single plate options around... just my opinion that a twin plate is a lot more 'fail safe' particularly if it's going to get a lot of abuse at the drags.
As for drivability... well modern setups aren't like the days of old, I find mine very good for drivability, the pressure plate has more to do with drivability IMHO. My pressure plate had quite a bit of work done to move hinging? points around to give a lighter feeling whilst retaining a high clamping force. Result being a clutch pedal that is perhaps 2X as heavy as my dads BAXR6 but has a much better progressive feel.
I've had no problem driving around in peak hour Melbourne traffic...

My advice is to stay away from puk clutches... they are a b&%ch in traffic... generally on or off thats it!
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