okay the new SCC has the STi vs 3 highly tuned WRX's.... one question...the SPI WRX had the most power and was the slowest...now...the turbo lag i understand...but they also said the CLUTCh wouldnt slip at all (theoretically a good thing) , but made it so they couldnt boost rev launch and ruined their 60ft 1/4 mile times....

I was contemplating changing clutches.... now Im afraid.... please lend some advice

-SHAHUL

ps- VISHNU had the fastest, but cheated with RA1- tires...lol, j/k

 

Shahul, you gotta understand the WRX tranny would not last on heavly clutch drop with the clutch in that car. Somthings gatta slip. Plus with a little slip it helps the turbo to spool up. Now out turbos are not 6in away from the ports like the EVO.

110 in the 1/4 for a off to shelf kit with 91oct (VERY NICE)

My Best
Eric

 

so many complain about the evo clutch... is the exedy twin disc the best way to go you think? Will it "slip" a bit for spooling? 110 in the 1/4 would be nice

-Shahul

 

Sorry I have no clue. I do have the exedy clutch in my rex with there flywheel. I love it and the quility is good. I would not use a twin disc or punk clutch for a street car. Very hard to drive it in traffic. Makes it a pain to drive nice.

Eric

 

thats good to know, I want to be very street-able

-Shahul

 

u dun slip the clutch on a AWD turbo. U boost and dump the clutch, if you do it right, the wheels will spin, and give u sub 2 60' times. HOWEVER, if u don't do it right, say goodbye to ur old tranny and say hello to a new tranny. Something has to slip, whether it be ur tires or ur tranny.

 

yea i saw how some other people are launching... just gotta learn the car more and should get easier

-shahul

 

FWIW, we ran a Helix metalic clutch in our EVO (stage zero plus downpipe) for two magazine camparo tests (SCC and C&D) which should be showing up on the stands within the next month or two. While it was impressively streetable in stop and go traffic (as far as metalic clutches go), it slowed down high-rpm shifting a lot. Above 5000rpm, the gears would grind terribly if you tried to shift quickly. Needless to say, this slowed down acceleration times dramatically. ETs were a miserable 13.0 with good traps of 107-108mph on 91 octane. Datalogs showed the 3-4 shift taking 1 full second, compared to the usual 0.3-.06 seconds it should otherwise take. Appearantly, the Helix clutch wouldn't release well enough when it was spinning quickly.

Cheers,
Shiv

PS. Our last-minute wrenching revealed that the ralliart front differential won't fit in the EVO 8 housing either.

 

are you going to try something else?

-Shahul

 

The Exedy twin disk is actually very streetable...much easier to drive than the Exedy Hyper Single clutch.

 

will it let the engine spool a bit at launch, also what about shift time, grinding ?

-Shahul

 

Shiv,
Have you done any experimenting with removal of the valve plate and valve plate spring in the clutch release cyllinder? It appears that this setup is designed to increase the duration of the final pressure transfer from the release cylinder when engaging and disengaging the clutch. With the valve plate (restrictor) and valve plate spring (restrictor volume byppass mecahnism) removed, the pressure transfer should occur quicker and permit faster engagement and disengagement.

This probably has nothing to do with your shifting difficulties experienced with Helix clutch but may contribute to cluth slippage and slow engagement/disengagement cycles in general.

 

This is a popular mod on the 2G (95-99) turbo DSM's. Allows you to dump the clutch and break your drivetrain more effectively. Just kidding. Sort of.



--Dan
Mach V Motorsports
MachEVO.com