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Virginia Rocks!
Join Date: Oct 2003
Location: Just outside the beltway
Posts: 8,497
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Decelleration Valve and Performance Driving
I have always wondered why there was a plugged hose hanging out in my engine bay. So with the help of Bentley and the search I found out what the decelleration valve was for (5 min ago).
Basically (for those that don't wan't to look it up) It lets the idle down slowly when coming off the gas supposedly to burn off the extra hydrocarbons and eliminate the popping sound. If you are performance driving and ready to do a downshift, if the idle *didn't* drop as suddenly as it does presently, would you be able to use it to your advantage either by way of heel-and-toe rev matching or some other thing I'm not thinking of. Just a though for a Friday afternoon. I haven't had a chance to try it, have any of you?
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Rosewood 1983 911 SC Targa | Black 1990 944 S2 | White 1980 BMW R65 | Past: Crystal 1986 944 na Guards Red is for the Unoriginal
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09-24-2004, 12:39 PM
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Registered
Join Date: Apr 2003
Location: Maitland, Florida
Posts: 892
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The decel valve is just a dashpot that makes the car less controlable. I'd rather that I set the engine speed, not let it sort hang ther ewith a fast idle. When I lift off, I want the car to slow down.
Just learn to heal and toe properly. I used to drive a 1923 Packard with straight cut sliding gears in the tranny. If you synced the revs right it shifted like a hot knife through butter. A really fun car. Regards, Jerry Kroeger
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82 911SC Targa (05 Boxster S ) gone, but not forgotten 87 Suzuki GSXR-1100 1953 MG TD Mk II |
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09-24-2004, 05:54 PM
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Virginia Rocks!
Join Date: Oct 2003
Location: Just outside the beltway
Posts: 8,497
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I wasn't going to hook it back up. I was just curious if anyone was able to use this original design to some kind of advantage.
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Rosewood 1983 911 SC Targa | Black 1990 944 S2 | White 1980 BMW R65 | Past: Crystal 1986 944 na Guards Red is for the Unoriginal
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09-24-2004, 07:03 PM
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Registered
Join Date: Oct 2003
Posts: 333
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Yes, I like it actually. I have the decelaration valve/vacuum that can be adjusted. Besides the functions you mention it also matches the revs to the gear you're shifting to, it took me some adjusting but know it's really working nice/comfortable for me.
 Picture courtesy of one of our fellow pelicans. I would just hook it up and see how you like it. Regards, Gerko 1978sc |
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09-24-2004, 09:53 PM
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Registered
Join Date: Dec 1999
Location: Novato, CA
Posts: 4,740
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With the decel valve hooked up it makes heel and toeing much easier/ almost unecessary by helping keep the r's up a bit to help match the next gear.
Joe |
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09-25-2004, 02:30 PM
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