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Help: What transmission fluid?

 
Old 04-22-2016, 10:05 AM
  #16  
P-daddy
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Originally Posted by LM964 View Post
+1 Swepco 201 (80W-90) and a C4. Since switching to this a few years ago the gear selection just seemed smoother when hot..
How were your shifts when cold? I find shifts with Swepco very notchy and crunchy until the trans get nice and warm.
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Old 04-22-2016, 11:11 AM
  #17  
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Originally Posted by cobalt View Post
If you have an LSD make sure it has friction modifiers. Most do but not all yiou can add modifiers as well.
Matt @ GT Gears.... only use these if noise is an issue for you. Friction modifiers render the LSD less effective. Delvac does not have these, I don't use them. My 89 G chatters a little bit at slow speed sharp turns, otherwise no noise. Other cars make no noise.
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Old 04-22-2016, 07:06 PM
  #18  
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I just changed from the Redline to the Mobil Delvac. While the Delvac is a little uncooperative when cold, it warms up remarkably quickly (I drive it in the winter; have snow tires and everything...).

The Redline worked well for me, but Matt at GT is *very* against it, in particular in tracked cars as there's not enough lubrication when the oil is hot.
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Old 04-22-2016, 09:00 PM
  #19  
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Originally Posted by Spyerx View Post
Mobil Devlac in all 3 of my 911s with G50 derivatives.
Downside is a bit balky when cold.
Upside is excellent warm and hot performance.
+1 except to add that in some markets Delvac is called SHC, this is not going to be available at your FLAPS

Track used g50s Delvac or SHC, for street use stock Porsche trans fluid is fine, for 915 Swepco this could also be used in g50 but I'd prefer Delvac for that

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Old 04-23-2016, 06:33 AM
  #20  
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Originally Posted by P-daddy View Post
How were your shifts when cold? I find shifts with Swepco very notchy and crunchy until the trans get nice and warm.
TBH P-Daddy, I normally allow the engine oil to warm up for 10 minutes before I use the car. By then the transmission oil too has raised in temp. Yes, when I've used when cold (or not warmed up fully) gear changes require a tad more 'feel' - I just make sure changes are smooth. Once all warmed up it's excellent - I'm giving it plenty of beans and fast throttle blip downshifts with really great selection feel.
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Old 04-23-2016, 09:07 AM
  #21  
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Originally Posted by Spyerx View Post
Matt @ GT Gears.... only use these if noise is an issue for you. Friction modifiers render the LSD less effective. Delvac does not have these, I don't use them. My 89 G chatters a little bit at slow speed sharp turns, otherwise no noise. Other cars make no noise.
The turbo is loud enough at slow speeds and reverse that you get some interesting looks like something is broken. There is a TSB about it some are worse than others. The C2 chatters a bit. I don't use them in the track car. You can't hear anything when that car is running.
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Old 04-23-2016, 01:08 PM
  #22  
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Yeah I'm just too lazy to put another fluild in there and all my shop carries is delvac for these transmissions :-)
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Old 04-24-2016, 11:46 AM
  #23  
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Originally Posted by cobalt View Post
The turbo is loud enough at slow speeds and reverse that you get some interesting looks like something is broken. There is a TSB about it some are worse than others. The C2 chatters a bit. I don't use them in the track car. You can't hear anything when that car is running.
964turbo and 964RS were special cases. The lsd in those cars was a 20/100, that 100% nominal lockup was problematic and is probably one of the few places where friction modifiers are usually going to be wanted.

Most of us are happy w/ 40/60 to 50/80 or so
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Old 04-24-2016, 02:41 PM
  #24  
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what Bill said. Those 20/100 lsds are a nightmare.
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Old 04-24-2016, 10:24 PM
  #25  
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Originally Posted by GTgears View Post
what Bill said. Those 20/100 lsds are a nightmare.
Thank goodness these are so loud and not for the street locker.. I agree the 20/100 is a bit overkill and prefer 40/60.
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Old 04-26-2016, 09:57 PM
  #26  
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Swepco now makes a fully synthetic 75W90:

http://www.paragon-products.com/Swep...swepco-202.htm
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