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AskewRSR's Avatar
 
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76 930 with Lim Slip 915 Trans Clutch and Flywheel options??

What Clutch and Flywheel would you use on this set up. It needs a 6 bolt flywheel.
What clutch set up? Part numbers would be great. Let me know. Thanks. T
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Old 07-22-2019, 09:27 AM
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76 3.0 turbo flywheel
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Old 07-22-2019, 09:31 AM
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Thanks. I saw Eric already posted. Much appreciated. T
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Old 07-22-2019, 10:52 AM
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Old 07-23-2019, 03:30 AM
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I have a clutch kit I took out of my 78 930 conversion that still had a 915.

finally found a short bell housing 930 gearbox I plan to use. have not checked to see if my clutch will work on that or not.
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Old 07-23-2019, 05:53 AM
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Quote:
Originally Posted by 911tracker85 View Post
I have a clutch kit I took out of my 78 930 conversion that still had a 915.

finally found a short bell housing 930 gearbox I plan to use. have not checked to see if my clutch will work on that or not.

It won't work, different stack. 78 930 conversion.. if 3.3 is different crank than early 3.0 930. Early 3.0 based on 6 bolt 2.7 crank and clutch pack is different.
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Old 07-23-2019, 06:18 AM
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Just get a 6 bolt 225 flywheel and a strong sachs kit like the SPORT aluminum setup. It'll hold 300hp/325tq fine.
Here's a good one
WVO STRTLT 915 6, WVO-STRTLT-915-6, WVO.STRTLT.915.6, WVOSTRTLT9156
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Last edited by quattrorunner; 07-23-2019 at 09:18 AM..
Old 07-23-2019, 09:08 AM
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Also if you're wanting a bit more boost/power then try the centerforce 225 unit, not aluminum but it's strong and not expensive.
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Old 07-23-2019, 09:21 AM
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Quote:
Originally Posted by quattrorunner View Post
Just get a 6 bolt 225 flywheel and a strong sachs kit like the SPORT aluminum setup. It'll hold 300hp/325tq fine.
915 Power Clutch is a stock clutch, cherry-picked at top 10% of spec. They're a little marginal with a 3.3 - as in right on the edge of what they'll hold. As little as SC cams and an open muffler might tip you over the edge. Or, in other words, don't expect a long life - I was seeing friction plates were down to the rivets after 12, 15000 miles. Seems likely it was slipping - although it didn't seem to be when driving the car...

Is a Sport PP actually more clamping power, or just less rotating mass at the same spec? I had the impression it was the latter, but it's so long since I pored over the specs trying to find something to work, I forget...

Find someone who knows, or find the specs and order the appropriate parts; There is a 915 pressure plate marked "ZF Sachs Race Engineering" that'll comfortably hold well over 400FWHP - my shop said it was the closest thing to an RSR clutch they can still get. But its a PITA, you don't want to resort to that unless you have to - and overkill for a 3.0 930 in stock-ish trim.

But they also do multiple options in-between, depending on what you need.

An important thing to bear is mind when comparison shopping is that specs from Sachs apparently have a safety margin of about 20% baked-in - as in, if Sachs quote 300 ft/lbs, everybody concerned would be pretty surprised if it let go before 360 ft/lbs or so.

Aftermarket clutches usually do not - or so I've been told (I only ever used Sachs parts). As in, if they quote 300 ft/bs, it might let go at 301.
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Old 07-23-2019, 11:51 AM
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I’ve had so many clutch combos with that engine trans combo that I feel like I have some experience. Yes the power clutch slips while not really feeling like it’s slipping. it does wear out with .8bar boost. The centerforce did hold better. Enough to break the second gears of two 915 transmissions.
The stock 930 clutch doesn’t hold much better than the 225mm power clutch. It let’s go more obviously.
I didn’t try the 225mm sport clutch because it’s expensive. The power clutch is aluminum though.
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Old 07-23-2019, 12:15 PM
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Quote:
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Iíve had so many clutch combos with that engine trans combo that I feel like I have some experience.
Heh. I know that feeling... Went through 4 clutches in quick succession (with the emphasis on "suck") in a few months.

Quote:
Originally Posted by quattrorunner View Post
I didnít try the 225mm sport clutch because itís expensive. The power clutch is aluminum though.
Pretty sure I tried a Sport at one point, with some fancy lining on the friction plate. Another for the pile of discards.

This worked for me, but wasn't all sunshine and puppies:


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'77 S with '78 930 power and a few other things.
Old 07-23-2019, 04:37 PM
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Ya that 4puck would be horrible. Again the centerforce was good. It was drivable and held power. And then tranny issues followed.
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Old 07-23-2019, 05:31 PM
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here are pics of what I have. it was on the 3.3 motor with a 915 gearbox.

the part number on the PP is a little different. cant read the part number on the disk but would get a new one if I tried to use this PP and flywheel is a 930 part number.




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87 924S resurrect and gut and another track car...
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Old 07-24-2019, 01:23 PM
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Old 07-24-2019, 06:57 PM
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915 Sachs RE all the way

Best to stick with either the Sachs Performance / RE clutch or then the KEP. What to avoid would be the Sachs Power Clutch because the never last and fracture often.

The picture in the blue box is a standard 915 Power Clutch.

Pic 1 is SRE, notice higher quality materials and stronger limit straps. This is a very important feature.


Pic 2 : KEP clutch and disc. The disc features fuller face lining to that of the newer 915 clutches.


Pic 3 : SRE Clutch and EPW 915 225 Forged Steel Flywheel



KEP 915 Stage 1 clutch set : Great quality and value, very durable. Florged alumin cover, HD limit straps..etc.


Standard 915 disc vs SRE disc. Big cost and enginnering feature differences



Don't waste resources on this Power Clutch


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Old 07-30-2019, 01:30 AM
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