flywhee/clutch/pressure plate

cfgioja Tue Jan 04, 2011 8:03 pm

Just trying to figure out what people are doing for flywheel/clutch/pressure plate upgrades.

I know Sloan had a deal with Spec but his whole business seems to be shut down now. His site had been disabled.

Even though I have bought RH everything, I was looking for the best option.

So any help would be nice.

944convert Tue Jan 04, 2011 8:17 pm

I recently ordered an OEM setup from Gene Culley:

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Items Ordered:
Item: LS7 clutch disc, pressure plate and flywheel
Items Total: $443.60
Shipping: $43.47
Handling Fee: $0.00
Discount: - $44.36
Order Total: $442.71

though I dunno what I'll do about changing the disk yet

Arthropraxis Tue Jan 04, 2011 9:38 pm

Spec still sells clutch setups for the conversion. Call them or go to their website and order what you want.

**Admin** Tue Jan 04, 2011 9:58 pm

I'm a Spec dealer now, What all do you need?

cfgioja Tue Jan 04, 2011 11:26 pm

Eric,

I sent you a PM.

I did take some time to look at what spec offers on their site for our conversion and still am not sure what I need. I know I would like to go a lighter in the flywheel but am not sure if the pressure plate needs to be lighter too, also what stage of plate to get for our setups running 375+ hp.

Looking to get better than a stage one preferably for longevity.

Dan J Wed Jan 05, 2011 11:55 am

Clutch - I spoke with Spec back in the spring of 2010 about which combination was best for an LS1 conversion making under 450 flywheel HP. They suggested the aluminum flywheel with a Stage 1 clutch disc and pressure plate. So I purchased that and am using the Wilwood clutch MC.

Dan.

docwyte Wed Jan 05, 2011 12:04 pm

I called Spec and talked to them, they kept recommending their hybrid clutch that holds 700ft lbs of torque. They didn't seem to understand that I was making way less than that.

I went with the aluminum lightweight flywheel and stage 2 disc. Bought them through Eric, he installed it all.

Pedal feel is pretty firm, the stage 2 disc is probably overkill and contributes to the heavy clutch pedal.

It does work great though!

Arthropraxis Wed Jan 05, 2011 12:08 pm

Are you running the 14/16th inch wilwood master cylinder for the clutch?

docwyte Wed Jan 05, 2011 12:10 pm

I have no idea. I'm running the Ford Mustang hydroboost for the brakes, not sure what slave cylinder I'm using.

Eric knows and I'm sure he'll chime in.

Clutch pedal feel is heavier than I'd like by a decent amount. I don't notice it at all on the track, but when driving on the street it's annoying. I do have to say that I prefer a fairly light feel for the clutch pedal though.

Dan J Wed Jan 05, 2011 12:30 pm

I used the .875" Wilwood. Pedal is firm, but not awful - for a performance clutch.

There was a discussion regarding whether or not the shim (provided in the clutch kit) is necessary when using that clutch/MC combo...jury is still out on that.

Dan.

Arthropraxis Wed Jan 05, 2011 12:53 pm

I am going to do some measurements before I permanently install the motor to see if I need a shim. The info that came with the Spec clutch said the shim would be needed but I don't know which slave I have and different brands have slightly different heights/lengths. .875 is 7/8ths that seems to be the concensus for the clutch master cylinder.
Can the spring at the clutch pedal be adjusted to assist with the clutch effort?

cfgioja Wed Jan 05, 2011 1:58 pm

I am looking at the stage 2 setup with the aluminum flywheel and possibly looking at running the Aluminum Pressure plate to help with weight savings too.

I will need to upgrade my master for the Clutch.

I know stage 2 is alittle overkill, but I do not like the stage 1 woven fibers, they wear too fast for anytype of hard driving.

what part number is the wilwood master? I saw they have a few options.

Dan J Wed Jan 05, 2011 2:12 pm

260-10374

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You'll need to adapt or buy a pushrod. I got one from xschop.

Dan.

cfgioja Wed Jan 05, 2011 3:02 pm

already have the pushrod adapter. Got one from Robert awhile ago for future use.

Thanks for the link.

Do you have to use the firewall plate, or does it bolt to the car and work fine without it?

Dan J Wed Jan 05, 2011 3:09 pm

I used the firewall plate from Greg - it covers both the brake and clutch MC area. I also now have a brake MC firewall plate in addition - this one was developed by Eric for positioning the Wilwood brake MC a few degrees up and away from the cylinder head.

I'm not driving the car yet...so results aren't yet conclusive. I can say that there's absolutely no flex with either the brakes or clutch. The 2 plates combined do limit how far back you can position the motor though.

There's an awful lot of ways around the barn, that's for sure.

Dan.

cfgioja Wed Jan 05, 2011 3:34 pm

I will be using the hydroboost setup, so the brakes are not too much of a concern as far as the plate. I just didnt know if the setup had a special plate just for clutch MC.

Looking at the assemblies like that, how did you come up with the 7/8" bore size? I mean you guys are talking about the clutch pedal being firm or too firm, why not run a different bore size, wouldnt that help? according to the Tech at wilwood if its too firm we need to run smaller bores.

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Arthropraxis Wed Jan 05, 2011 4:51 pm

IIRC, the smaller bores don't have enough volume to move the C5 slave enough making it hard to get into gear. Xschop tried the 13/16ths and said it didn't work as well as the 7/8ths. The factory clutch MC is 3/4".

cfgioja Wed Jan 05, 2011 5:40 pm

That makes sense, I didn't think of that before I asked. Is there a way to relocate the pedal hole like the brake clevis pin to assist in the angle?

Arthropraxis Wed Jan 05, 2011 5:55 pm

Good idea. Anyone tried that before?

modenas Wed Jan 05, 2011 7:50 pm

i believe so, didnt xschop drill up one inch above the current hole?

xschop Wed Jan 05, 2011 9:30 pm

All you need is a 13/16" or 7/8" Wilwood MC. I designed the pushrod adapter for the Wilwood threading. I didn't drill the clutch pedal. I have the 7/8" installed because I like the firmer pedal on the clutch. 13/16" will be a little easier and the adjustable pushrod adapter can dial that one in too for plenty of MC stroke and clutch release.

Arthropraxis Wed Jan 05, 2011 9:43 pm

No grinding with the 13/16" MC? If not that would be the one to go with to make it a little easier for daily traffic.

xschop Wed Jan 05, 2011 10:00 pm

No grinding. Like I said the 4130 steel conversion adapter can fully adjust either way. Mind you I am running factory Pressure plate and the Dodge truck clutch disc. The spec clutches really need to be measured but that another story. From everything I read here on those issues, I would go with the 7/8" wilwood using the Spec clutch disc since it is thinner and the PP splines are probably futher from the T.O. bearing.

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flywhee/clutch/pressure plate

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