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 Disk Choices

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Clutch Disk Choices

Post by erioshi on Wed Oct 07, 2015 10:36 am

I know that the standard answer here seems to be to use a SACHS BBD4163 (11", 1", 23 spline).  My concern was that it seemed a bit thin when compared to the LS clutch disk it is replacing.  Does anyone know at what power level it's time to move to something with a bit more beef?

I have been considering a Centerforce 384070 which looks to be a direct replacement.

Link: http://www.amazon.com/gp/product/compatibility-chart/B000CISMSM?ie=UTF8&i=225

My car will not have all that much power; probably between 350 - 400 whp when finished.  The power will also be put through a Fidanza aluminum flywheel, which should reduce the wear the clutch disk sees, as long as I'm not riding the clutch.  I already have the Sachs on hand, but if swapping now will significantly prolong the time between clutch replacements, I'd be very interested upgrading while the engine is still on the stand.  Thoughts?
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erioshi

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Re: Clutch Disk Choices

Post by docwyte on Thu Oct 08, 2015 7:52 am

I have the Spec Stage 2 along with their lightened flywheel. It's been pretty much bomb proof. I've run it with power levels from 340whp to 425whp and torque levels of 350 ft lbs to 410 ft lbs at the wheels. No slippage, no bad manners.

If you decide to run the flywheel you currently have, make sure you take it, along with whatever clutch disc and pressure plate you buy to a machine shop and have them balance them all together...

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Re: Clutch Disk Choices

Post by Arthropraxis on Thu Oct 08, 2015 10:09 pm

docwyte wrote:If you decide to run the flywheel you currently have, make sure you take it, along with whatever clutch disc and pressure plate you buy to a machine shop and have them balance them all together...
Take that advice. Make sure to get a disc made for the Porsche splines. I initially installed a Spec unit and the splines fit tighter than the Sachs unit that replaced it.
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Re: Clutch Disk Choices

Post by erioshi on Thu Oct 08, 2015 11:29 pm

Thanks for the feedback. I guess I'll have to see what I can find out about the Centerforce disk. It lists as cross-compatible with the same applications as the Sachs we currently use.

I will have the flywheel and pressure plate balanced as a unit, and the clutch disk balanced by itself. I've done that with ever performance build I've done.
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Re: Clutch Disk Choices

Post by Techno Duck on Fri Oct 09, 2015 7:01 am

I am very happy with the Spec Stage 2 setup also. I am running the complete stage 2 package with the pressure plate and a lightened steel flywheel. Good throttle response and still very managable on the street. Pedal is firm with the right size master cylinder, not my first car of choice to get stuck in traffic in but its not a chore to drive. I went with the mid weight steel flywheel to keep some street manners. Too light is a PITA especially with a disc that grips hard.

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Re: Clutch Disk Choices

Post by Lemming on Fri Oct 09, 2015 7:26 am

Techno Duck wrote:Too light is a PITA especially with a disc that grips hard.

Tell me about it, I use the Spec Stage 3 six puck with lightened flywheel and pressure plate.  Good thing it's only used on track!
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Re: Clutch Disk Choices

Post by docwyte on Fri Oct 09, 2015 1:57 pm

Get *everything* balanced together! That means flywheel, clutch and pressure plate...

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Re: Clutch Disk Choices

Post by erioshi on Sat Oct 10, 2015 11:03 am

Doc, yes, I know what "they" say, but you realize the flywheel and pressure plate have one permanent, consistent relationship with the spinning engine internals, and the clutch disk changes it's relationship to everything except the transmission input shaft every time you press the clutch pedal, right? The clutch disk needs to be neutral balanced by itself, and the flywheel pressure plate combo should be balanced together .. and ideally with the other spinning engine internals.
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Re: Clutch Disk Choices

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