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Join Date: Apr 2011
Location: behind the redwood curtain, (humboldt county) california
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Shift coupler upgrades??

I am going to have my 915 gone through and am looking for advice on the best shift coupler. I am going with the Renshift, rather than the Wevo, because it seems a more complete, adjustable assembly.
Which coupler, in your experience, does the best job?.
I am upgrading the suspension and brakes, modestly, and am looking to improve on the precision and air cooled experience.
I may win the lottery and be able to do a high compression ITB EFI, but as I creep along trying to make the car more immediately responsive and direct, I am looking for advice to be more one with the car, by doing the best parts.
This is my dad's 74 coupe. I'm going to install a GT lsd and occasionally do a bit of DE events, with Dunlop direzionales.
Thanks,
Chris, (70 year old phat phugger :-)
Old 07-10-2018, 07:24 PM
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I used the $21 kit from our host and it solved all of my problems.

You're more than welcome to spend a lot more money if you want.
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Old 07-11-2018, 01:34 PM
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New stock is good, but how much better are the aftermarket upgrades?.

Thanks Mike for the link. My old boss, one of the early volkswagen importers used to see me wrenching on my 914 hot rod and say, "Stock is Best".

With the eye watering costs of a missed shift/over-rev in our cars, particularly racing or DE events, is there enough improvement in the aftermarket couplers to warrant the expense. How much improvement, beyond new stock parts is there?
I know this is not quantifiable and new parts are ascribed as magic, particularly when replacing worn out 30-40 year old parts.

So, I'm looking for some experienced opinions.
Can't wait to get the 74 back on the road.
Chris
Old 07-14-2018, 06:52 PM
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I haven't used anything other than a stock coupler with fresh bushings, works great on street & track. It can be finicky to get the adjustment right, but not impossible. I can't see how a new $200 coupler improves 915 shifting. Maybe it does but i'm spending my money elsewhere.
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Cheers, Chris
1975 Carrera / 965 tribute w/ 1989 3.3 turbo 8.5:1, custom Evergreen K27 7200, 964 cams, euro CIS, TEC1 dual plug, rarlyL8 headers & hooligan pipe. 915/68 trans, kevlar clutch and lightweight pressure plate.
Old 07-17-2018, 12:16 PM
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Use bushings with tight round holes in the stock metal coupler, not the stock oval ones. Takes out all the slop. Cheap, too.
Old 07-25-2018, 06:58 PM
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Is this the 914 bushing

Thanks Walt,
Is this referred to as the 914 bushing?
Is there any functional improvement going to the Wevo or Rennshift coupler, if so, how significant is it over the new round bushings?.

Time marches on,techniques and materials evolve, or is this just bling.

Headlight relays, sport hardness rubber bushings, heim joint drop links, bronze pedal bushings, ceramic coatings, LED lighting, ..........

Looking for some been there, done that advice.

Thanks,
chris
Old 07-25-2018, 08:59 PM
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Iíve been there - it seems like youíve narrowed it down to Wevo or Rennshift - but just for consideration (from a hack mechanic with next to zero skills) - I replaced the worn out shift coupler on my car a few years back with the Stomski Racing Precision Shift Coupler. It has functioned flawlessly since over about 20k miles. Not cheapest option but def a high quality part. Would use again since itís been an install and forget repair. Good luck with the project.
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Old 07-26-2018, 03:37 AM
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Add Stomsky coupler to list of candidates

Forgot about their PSC.
I know comparing a high edd replacement to a worn out stock coupler is pointless, but am looking for some real world experience new bushings to aftermarket coupler?

Is this just cost ineffective overkill, or is there a real improvement??
Curious,
Chris
Old 07-26-2018, 04:12 PM
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My real world experience is from rattling original (at least 25 yrs) to Stomski. That comparison puts Stomski way ahead for real improvement. No objective data, but subjectively the Stomski has been an excellent replacement to the Porsche designed part - very direct, zero ďplayĒ and a perfect fit. And for the 1st to 2nd shift at AX direct function is nice to have in the drive train. I think itís cost effective (engineering overkill). Wevo or Stomski - No negatives that I recall...
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Old 07-27-2018, 04:02 AM
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