Over-rev update

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03-22-2007, 05:02 PM
scmx5driver

Quote:

Originally Posted by Nexus Flux

Well there you are heading in Ian's direction. By using heel-toe downshifting to brake you are using the engine to do some of the braking. You do this by doing some rev matching but still using the energy of the car moving forward to drive the engine meanwhile the gas pedal is mostly out so the engine wants to idle. The energy is shifted from the rear (in a RWD car) through the drive line (assuming no slipping/properly working clutch, at this time clutch is fully engaged, and the sychros are just chillin') to drive the engine. If done properly and at a correct/safe RPM, this will overdrive the engine but will not result in dangerous over reving (sky high RPM level).

Wheew... That's my ::2Cents::

:clap: :D :clap:

Well, my point is, if you don't heal-toe i.e. rev-match and just downshift. There is a good chance, at least if your driving competitively, that you'll brake the drive tires loose and weeeeeeeee, I mean Arrrrrrrrrrrr, bad things happen.
03-22-2007, 05:07 PM
scmx5driver

Quote:

Originally Posted by Nexus Flux

How about we all go and :study: :drive: ::Teacher: and then go :study: some more followed by :drink: :chug: Then we can have a nice big ::Grouphug.

Quote:

Originally Posted by Magma

I think you have been :beer:already today

:( You guys have more buttons to push than I do.

::Rant:: is over.
03-22-2007, 05:47 PM
altiain

Quote:

Originally Posted by scmx5driver

And if downshifting couldn't lock-up the back wheels than there wouldn't be much point in heal-toe downshifting, now would there.

Okay, now I think I understand what you were trying to say. Since neither you nor Chad mentioned braking in your previous posts, I didn't address it in my responses. Chad's original scenario involved downshifting to 2nd (while looking for 4th) on the freeway (no braking was mentioned).

Robert, I agree with you on the point above - if you manage to botch a downshift in a car w/o ABS while you've got the driven wheels at or near their traction limit under braking then yeah, you might spin the tires instead of overrevving the engine. In that case, the tires would be the path of least resistance.
03-22-2007, 05:52 PM
Titus

Quote:

So the only lesson I needed was... No, the synchros won't stop it. If yours do, they might be worn.

I think I know how to stop the synchros...

http://www.hobbieguyrc.com/shop/images/PAAPT42.jpg

::Clown:: ::Clown:: ::Clown:: ::Clown:: ::Clown::
03-22-2007, 05:57 PM
Adam Payrot

Quote:

Originally Posted by scmx5driver

:( You guys have more buttons to push than I do.

::Rant:: is over.

Press the [More] button underneath the ::BaHump:: and you get more buttons to push :chug:
03-22-2007, 05:59 PM
Adam Payrot

Quote:

Originally Posted by Magma

I think you have been :beer:already today

I guess he's "working" from home again ::Clown::
03-22-2007, 06:15 PM
Nexus Flux

Quote:

Originally Posted by Adam Payrot

I guess he's "working" from home again ::Clown::

No, actually I've been at work all day today. I've only had a few cigs. Haven't had a drop of anything. It's just that I've been watching those two go back and forth all day and I just couldn't take it any more.

I was joking about them ::2Guns:: ::BLee:: :bash: so I thought I'd have a little fun.
03-22-2007, 06:38 PM
Adam Payrot

Quote:

Originally Posted by Nexus Flux

No, actually I've been at work all day today. I've only had a few cigs. Haven't had a drop of anything. It's just that I've been watching those two go back and forth all day and I just couldn't take it any more.

I was joking about them ::2Guns:: ::BLee:: :bash: so I thought I'd have a little fun.

As was I about you ;)
03-22-2007, 07:21 PM
Treibenschnell

Quote:

Originally Posted by Magma

:snack:

So this is what it's like to be a spectator... ;)
03-22-2007, 07:39 PM
channelmaniac

Quote:

Originally Posted by Treibenschnell

So this is what it's like to be a spectator... ;)

Are you on the sidelines sitting on a ::box:: ?
03-22-2007, 07:52 PM
Treibenschnell

Quote:

Originally Posted by channelmaniac

Are you on the sidelines sitting on a ::box:: ?

Yup... sitting on a box full of
03-22-2007, 08:36 PM
Majik

Quote:

Originally Posted by Treibenschnell

Yup... sitting on a box full of

::turd:: ?
03-22-2007, 08:53 PM
altiain

Quote:

Originally Posted by Treibenschnell

Yup... sitting on a box full of

Quote:

Originally Posted by Majik

::turd:: ?

CW33 makin' some more cutbacks, eh? :wink:
03-23-2007, 02:12 PM
RX7-2nr

Quote:

Originally Posted by altiain

Okay, now I think I understand what you were trying to say. Since neither you nor Chad mentioned braking in your previous posts, I didn't address it in my responses. Chad's original scenario involved downshifting to 2nd (while looking for 4th) on the freeway (no braking was mentioned).

i can back up the tires locking up, but as you guessed the car wasnt going in a straight line. i was an MR2 Spyder taking a wide left hand turn at a fairly quick speed. i was in 5th, went to shift to 4th to pull through the corner. matched my revs and let the clutch out. SCREEEEEEEECH- car spun around twice. i had grabbed 2nd gear instead of 4th. didnt hit anything, but i still needed clean pants. LOL. the tranny in the MR2 has left a bad taste in my mouth since.

again- this wouldnt have happened if i had been going in a straight line, the RPM would have shot well over redline.
03-23-2007, 04:28 PM
Machismo

If even traveling in a straight line, you would have been pointing somewhere other than straight when all was said and done.

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