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Making metal Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Tue, 24 Apr 2007 05:30:55
In Reply to: straight shift manual???? Also motor mount question???, AERO 5speed, Mon, 23 Apr 2007 21:57:53 Members do not see ads below this line. - Help Keep This Site Online - Signup |
That's the term I've heard instructors use for folks learning to double-clutch downshift non-synchro race trannies.
Not using the clutch is better for the clutch. However, it is much worse for the transmission. Yes, you can shift without a clutch if you match the engine speed just right. If you are off just a little bit, well, that's what the synchronizer is for. I have done this when I've had a clutch failure. Yes, clutches are expensive. But transmission gears and synchros are much more expensive to replace. Shifting without a clutch would be about the same wear on a transmission if you get EVERY shift perfect, matching revs just right. For every poor shift, the tranny gets whacked. So if everything is perfect it is the same, and if you ever make mistakes, the tranny pays for it. Doesn't sound like a good idea to me.
Why is one urethane bushing for sure?
If you are doing it on the engine side because you can use a two-piece bushing and it is easier, then use a rubber one on the engine side. If you have any concern about vibration, go with as much stock rubber as possible.
If you are going with one urethane bushing as a performance improvement, you won't get much unless you change both bushings. And throw in some suspension mods.
Here is my take on non-stock motor mounts - going to a stiffer, aftermarket motor mount invites extra vibration. Will it be too much? That depends on your individual engine and your individual comfort level. Some engine just shake more. Changing motor mounts is a pain, so I like doing them only once. So I'm not big on experimentation. My recommendation -
If you aren't modifying the suspension or making other performance mods, go with two stock rubber bushings. That will provide the most comfort with reasonable engine movement control.
If you are making other performance mods, you have already decided to give up some comfort for more performance. In which case stiffer mounts are part of an overall package. You will see slightly better power shifts with one stiff upper mount, somewhat better with both stiffer. However, you will likely get more vibration.
Saab did a decent job of trading comfort for shift control with the rubber bushings. Stiffer mounts invite extra vibration. How much you get is variable. If you're willing to go back to rubber if the vibration is too much, then go with stiffer. If you only want to do it once, decide what you want the car to be.
posted by 192.249....
, Tue, 24 Apr 2007 19:21:47
, Tue, 24 Apr 2007 08:17:06, Tue, 24 Apr 2007 05:30:55 <-- Viewing This Message, Tue, 24 Apr 2007 03:41:47
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