HOW TO DO AN ADVANCED SEARCH.

Mon Jul 08, 2013 3:56 pm by Admin


For the benefit of 944Hybrids users there are two search functions available for you to use.
The purpose of this sticky is to explain the "Advanced Search" function because it is much more powerful and is the best choice when researching information.

When you log on to the site a list of options is shown in a line at the top of the page. One option is labelled "Search", use this option (NOT the search box lower down on the right).

After you click on the upper search option, a drop down box appears. At the bottom of this box is a radio button marked "Advanced …

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Clutch Master Upgrade

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Re: Clutch Master Upgrade

Post by Arthropraxis on Sun Apr 10, 2011 8:38 pm

I am sure someone will correct me if I am wrong. It is my understanding the MC has more to do with the throw of the slave cylinder than the type of clutch. So, if you already have the stage 2 clutch go ahead and put it in.
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Re: Clutch Master Upgrade

Post by cfgioja on Mon Apr 11, 2011 12:44 am

I recall someone saying that the upgraded pressure plate would require more push than the stock mc would give. Is that incorrect then. I would love more than anything to throw the stage 2 setup in there and go with the stock MC for the moment.
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Re: Clutch Master Upgrade

Post by Wild Bill on Mon Apr 11, 2011 8:13 pm

Just build up your leg muscle and the foot pressure will still be less than if you install a larger bore clutch master. I can't see the Porsche clutch master having any issue developing enough pressure to release the clutch, are they blowing up?
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Re: Clutch Master Upgrade

Post by cfgioja on Mon Apr 11, 2011 9:17 pm

cool. I will just install the new setup and keep fingers crossed. I just know at the start of the thread the subject of clutch drag came up. Just wanted to get other opinions.
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Re: Clutch Master Upgrade

Post by Wild Bill on Mon Apr 11, 2011 9:31 pm

cfgioja wrote:cool. I will just install the new setup and keep fingers crossed. I just know at the start of the thread the subject of clutch drag came up. Just wanted to get other opinions.

That very discussion is the reason I dropped the pin on my pedal for more stroke as there is unused clutch master cylinder stroke in the factory setup. I don't know if I needed to do it... Works great though!
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Re: Clutch Master Upgrade

Post by cfgioja on Mon Apr 11, 2011 9:34 pm

so like the brakes you can drop the pin, I will test it out when I get the engine back in and see how it feels. thanks for the info
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Re: Clutch Master Upgrade

Post by 944-LT1 on Sun Sep 18, 2011 9:11 pm

Man oh man. Looks like I have the same situation with the stock CMC not pushing enough volume. I just bought a new stock CMC too!! Mad

So, I guess Im going to be buying one of the 13/16 wilwoods.

Anybody have one of those clevises???

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Re: Clutch Master Upgrade

Post by xschop on Mon Sep 19, 2011 9:45 am

I'm working on another 1-off kit with the modded 13/16" Wilwood. I can make you a spare clevis next weekend. BTW the only TO bearing I would use is the AP brand casting D951004. If it's cast blank then it is from a known inferior Chinese manufacturer and comes pre-deteriorated at the inner seal. Avoid it like your mother-in-law. The Quality one has zero air bubbles in the casting and machines beautifully....

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Also to elucidate, The cheap TO bearing may have a different/shorter bearing (less than 0.5") that can cause clutch issues as I've seen it posted on an LS1 forum. Some guy actually took apart the TO bearing and calculated the volume... I give him props on analytics. And If your aftermarket clutch manufacturer requires more that 1.00" throw at the Pressure Plate tines for release, then you might have problems too FYI....

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Re: Clutch Master Upgrade

Post by 944-LT1 on Mon Sep 19, 2011 11:35 am

Craaaaaap. Youre gonna FORCE me to take my engine back out arent ya. pale I just got it all done, jumped in for a relaxing ride around the town, cranked the key.... no disengage when running.

I just bought a new C5 slave. So, a new CMC and a new slave may have to be replaced. Mad

Can you see the casting number from the inspection cover area?

EDIT: Yes, you can see the slave casting number from the inspection cover. Mine says "aP D951004" with a green dot. Also no signs of fluid leaking too. Yay.

The flywheel and pressure plate is stock LS7 with the SAC adjusment.

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Re: Clutch Master Upgrade

Post by 944-LT1 on Mon Sep 19, 2011 11:47 am

Would also like to ask if anyone has added a shim with these conversions and if so, is it possible to slide one between the slave and adapter with the engine still in the car (from the inspection cover)? It looks like I can get a wrench to the 2 bolts holding the slave easy enough through the inspection cover area and if I cut/slot the shim so the driveshaft can slide through, I think I can get by not having to remove the engine again.


EDIT AGAIN: I tried, cant do it. Need atleast 3-6 inches to get a shim in there. Rolling Eyes

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Re: Clutch Master Upgrade

Post by Arthropraxis on Mon Sep 19, 2011 2:30 pm

I used a Spec clutch and it said in the instructions to use the shim provided. In my application it was necessary after measuring both with and without the shim. Mine isn't on the ground so I don't know if it is working correctly or not.
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Re: Clutch Master Upgrade

Post by 944-LT1 on Mon Sep 19, 2011 4:17 pm

Yeah, I dont think I need one afterall. The bearing is touching the plate fingers as it is now and the distance from the base of the slave cylinder to the bottom of the black plastic collar in the below picture is 7mm. I checked an extra slave I have and it is 7mm as well totally collapsed. After checking the extra slave, I found that the total distance the slave travels is ~15/16 - 1.0 inch. Then I checked the travel on the slave that I installed... it only travels 5/8". So, looks like I just need more volume to move the slave the full 1 inch.

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Re: Clutch Master Upgrade

Post by 87-944S on Mon Sep 19, 2011 4:40 pm

Well, not sure what my TB is, it's a RH item, but I did use a Wilwood M/C and clevis that XSChop made. For what it is worth release and pedal feel where just fine with the test drive the other day, I haven't measured anything in there yet as this info came out after I had it all in, but so far so good!
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Re: Clutch Master Upgrade

Post by 944-LT1 on Mon Sep 19, 2011 5:06 pm

Thanks Mike. Im sold on the 13/16. Is yours 13/16?

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Re: Clutch Master Upgrade

Post by 87-944S on Mon Sep 19, 2011 5:10 pm

Yes sir! Pretty darn cheap from Summit too! Don't ask me why, I have two brand new Porsche units, bought before the conversion plan, why two, I have no idea! What I have in parts in my basement and garage is scary. I will put them up on ebay to find a good home.


Last edited by 87-944S on Mon Sep 19, 2011 5:13 pm; edited 1 time in total (Reason for editing : additional info)
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Re: Clutch Master Upgrade

Post by xschop on Mon Sep 19, 2011 5:48 pm

13/16" Wilwood is the money and the one that I'm doing for the kit. Are you guys running a 24" or 26" -3an SS hose? I'm adding the fittings that mike posted to the TO and the Wilwood MC fitting is a 90 degree -3an to 1/8 NPT.

At 944-LT1....When collapsed, there was also 1/4" (@7mm) distance like you said on the AP TO bearing I measured, so you are fine. Just get the 13/16 Wilwood and the clevis. Your Trans will thank you on those High RPM shifts too.
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Re: Clutch Master Upgrade

Post by 87-944S on Mon Sep 19, 2011 6:49 pm

Hey XSChop, I am running a -4 AN braided hose that came with the RH kit. Not sure of the length, but given the choice between 24 or 26 inches I would take 26. It was tight getting around the dual M/C mount. Smile
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Re: Clutch Master Upgrade

Post by 944-LT1 on Mon Sep 19, 2011 7:45 pm

Thanks Rob.

I used to run a 26" -4AN from RH with the LT engine.

Now it is a -3AN 26in hose for the LS engine.

My hose is part number FBPA0030-26 for those who need the part number (a great length and quality hose).


Last edited by 944-LT1 on Sun Sep 25, 2011 9:39 pm; edited 1 time in total

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Re: Clutch Master Upgrade

Post by xschop on Mon Sep 19, 2011 9:53 pm

So a 24" will go under the stock Brake MC (Without Booster) and still be long enough? I still have the original C5 style push-on adapter and never measured..... I'll trade a Wilwood Clutch Clevis for a 28" -3an and the quick release TO input Russell PN # 640281 Very Happy
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Re: Clutch Master Upgrade

Post by 944-LT1 on Sun Sep 25, 2011 9:36 pm

I have an extra Russell fitting....it just sits there on my desk....Lonely. I dont have the hose though. You want the fitting?

Besides that, Just wanted to update this thread with my progress. I recieved a 13/16 Wilwood from Summit yesterday and installed it. I went for the vertical mounting.
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Re: Clutch Master Upgrade

Post by xschop on Sun Sep 25, 2011 9:52 pm

Thanks. Tehone is sendind one and a 28" line. Did you re-drill the firewall to get it mounted 90*?

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Re: Clutch Master Upgrade

Post by 944-LT1 on Sun Sep 25, 2011 10:27 pm

Yeah. I didnt really want another hose or remote reservoir hangin' around. Didnt take too long though.

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Re: Clutch Master Upgrade

Post by Arthropraxis on Sat Nov 26, 2011 6:05 pm

How much does the firewall flex with the upgraded MC's? I was getting a bit and installed L brackets off of the mounting bolts to the strut tower. It took some of the bulging away and the pedal was lighter afterwards. The firewall may be cracked but there is no evidence unless it is under the caulking.
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Re: Clutch Master Upgrade

Post by xschop on Sat Nov 26, 2011 8:02 pm

Arth, I don't get any flex on the upgraded Wilwood Clutch MC. I did get about 3/16 to 1/4" deflection on the Dual MC housing until I installed an adjustable rod to the strut tower.
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Re: Clutch Master Upgrade

Post by Arthropraxis on Sat Nov 26, 2011 8:29 pm

Thanks. I don't want to strip the brakes and clutch MC off after all that has gone into setting them up. If it gets worse over time I'll do something about it.
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Re: Clutch Master Upgrade

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