I've tried working on my double clutching while downshifting, and tried a shortcut. Here's the situation: Driving at 60mph I want to sprint ahead of another car. I pushed in the clutch and dropped into 3rd. I reved the engine to almost redline (clutch still in), took my foot off the gas and let out the clutch. This is when it happens, a God auful screetch from the clutch until it catches, then I can power up.
I can typically go 62mph in 2nd before I shift up into 3rd without redlining, so I thought it would be safe to downshift into 3rd at 60mph. I also get a chirp from the clutch sometimes when shifting up at high RPM. I had TSB00-54 completed in Apr. I think I drive it the same as I did prior to the completion of the TSB and I never heard this sound before the TSB.
Should I bring it all the way in the 2nd in the above situation?
Am I reving to High for 3rd in the above situation?
Am I letting the clutch out to fast?
Is there a problem with my clutch?
Or am I just an idiot that can't drive?
Thanks

 

that screech is probably your rear tires j/k
Just leave the gas in a get off the clutch. You don't need the rev to redline and you don't need to release the gas, just let the clutch out when the engine goes through 6000 RPM.
BTW, there ain't no essence of double clutching going on in your above scenario.

 

I agree w/ RT. learn to rev match

 

The simple answers to your questions IMO are:
You could, but why, you'd just be shifting to third a second later.
No.
No, however?
Not yet, but soon.
Yes, but since you asked questions you're capable of learning and won't be much longer?

I'm no expert , but in the real world this is what works for me.
My mph/gear rules are :
1st gear max 20 mph,
2nd gear max 60 mph,
3rd gear max- 80mph,
4th gear max 115 mph,
5th gear max- haven't reached yet.
From what I can tell of your description, you are not double clutching to match revs. Holding the clutch pedal to the floor while revving the engine does nothing to match the engine (flywheel) speed with the drive-line (clutch disk) speed. Therefore you have a mismatch between the two speeds when you pop the clutch pedal out and this is causing your screech, either at the clutch or at the rear wheels. Probably the rear wheels since they are slowing down to match the revs that the engine is at from your attempt to double-clutch.

To do a double-clutch properly you have to let off the gas, engage the clutch, shift to neutral, let out the clutch, rev the engine, re-engage the clutch, and then shift to the lower gear. This matches the flywheel speed to the clutch speed that's about to happen when you let out the clutch to the lower gear. Do a search for double-clutching. About a year ago there were several excellent threads on this subject along with heel-toeing, which is in effect double clutching while braking.

Until you learn to double-clutch, stop shifting the way you described. You are ruining your clutch and possibly damaging your drive-line. It would be better just to down-shift, keeping in mind the max speeds per gear mentioned above. Note that these are not the absolute max speeds per gear, but speeds that I have found are above VTEC and below redline usually around 7800-8200 rpm. This gives you a little time in that gear after the downshift for the VTEC pull, and then you should be up-shifting.

I'm sure I misspoke in my double-clutch techical description, so if any of the racer/technical gurus want to chime in, have at it.

 

As already stated, you are NOT double clutching. (Besides, double clutching isn't necessary unless you are planning a high rpm downshift into first.) It sounds to me that you ARE "trying" to rev match but you need to work on your timing and execution. When done correctly, your power train should just "flow" into the next lower gear. It's a thing of beauty.

 

A true double clutch procedure requires the following actions:
driving along and need to go to a lower gear, let off the gas, push in the clutch, shift to neutral, let out the clutch, blip the throttle to increase the engine and the transmission speed, push in the clutch, shift to the lower gear, let out the clutch. This procedure is not really needed on modern cars. Now something like my Dad's '57 MGA, you bet it is needed to downshift into 2nd or 1st!

 

[QUOTE]Originally posted by Gloffer
[B].................
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From what I can tell of your description, you are not double clutching to match revs. Holding the clutch pedal to the floor while revving the engine does nothing to match the engine (flywheel) speed with the drive-line (clutch disk) speed. Therefore you have a mismatch between the two speeds when you pop the clutch pedal out and this is causing your screech, either at the clutch or at the rear wheels. Probably the rear wheels since they are slowing down to match the revs that the engine is at from your attempt to double-clutch.

 

learn to double clutch, if at least for fun. on a S2K you can literally only tap the clutch 1inch in with 2 rhythmic dabs that makes shifts
translucent and even more dance like. its a physically more enjoyable process since each baby clutch depression is a ballistic movement.....like a quick boxing jab, instead of sustaining your foot even momentarily on the clutch for single clutching.
its analogous to running bases as a kid....if u round it out its funner and smoother than turning around abruptly 180degrees with each turn at the base.

 

I don't think the point of his question was so much HOW to do a double clutch. I think he is just using the wrong terminology, and he is asking about rev matching (as RT said).

I think that the problem is that slbutler is revving the engine MUCH higher than he should for a downshift into 3rd at 60 MPH. The engine should be revved to about 6K RPMs before letting the clutch out. If you rev it to 9K RPMs, and let the clutch out at WOT, you'll toast the clutch (which you may have already done).

 

Roger, Rev Matching is what I was trying to do. Wrong term since I did not understand the mechanics involved with both. Thanks for the advice and I won't do it anymore at 9grand.