downshifting is bad for tranny? - Page 4
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This is a discussion on downshifting is bad for tranny? within the Transmission & AWD forums, part of the Tech & Modifying & General Repairs category; Originally Posted by RedWRXwagoN isnt that just rev matching? Rev match is the goal. Throttle blip is the process. CIP, ...

  1. #46
    Registered User gimme_cat's Avatar
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    Quote Originally Posted by RedWRXwagoN View Post
    isnt that just rev matching?
    Rev match is the goal. Throttle blip is the process.


    CIP, you can still over-blip the throttle, but doing so and releasing the clutch pedal at the wrong time would result in an unsuccessful rev match.
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  3. #47
    Registered User RedWRXwagoN's Avatar
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    ohhh, it all makes sense now!

  4. #48
    Moderator YBNormal07's Avatar
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    Quote Originally Posted by gimme_cat View Post
    Rev match is the goal. Throttle blip is the process.


    CIP, you can still over-blip the throttle, but doing so and releasing the clutch pedal at the wrong time would result in an unsuccessful rev match.
    Without hours and hours on a track, it is virtually impossible to learn how to properly heal & toe fast enough and with enough precision to perfectly match revs on a downshift, in the middle of a race, while fighting off that <name your favorite track car to beat> who is creeping up on your inside.
    I've done it, but prefer a more moderate method as it is too easy to jerk around the trans trying rev match in battle. Thats just me though. The great ones...they do it and it is a thing of beuty to behold. If you want to see how it's done, try to find those in car videos of the japanese cars racing in the hills (why can't I remember this style of racing...it's drifting, but what is the japanese name?????). Those guys are good. But then, this may not be the best example as they often use clutch kick to bring out the rear....which is not good on the clutch or the trans.
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    Quote Originally Posted by Trainrex View Post
    Just to clarify, engine braking doesn't hurt the clutch, dragging to clutch to slow down does. Once the clutch is engaged, nothing is damaged. Rev matching is the key.
    can you clarify " dragging to clutch to slow down " ? i usualy release the clutch slowly and dont just let it go when i am downshifting to slow down is that what you mean?

  6. #50
    Registered User wrxwalsh's Avatar
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    it has taken me 3 years of driving both on the track and on the street, and i have become very good at the heel-toe downshift. it has gotten to the point that i dont realize it when i drive but just about everytime i come to a stop or slow down i knock out a heel-toed or rev matched downshift. it has become second nature to me and my driving style. on the comment of double clutching... you are a god if you can shift faster than me and put your clutch down twice.. however i know exactly how to do it because the 4th gear syncro in my tranny is gone and will not engage unless its double clutched... but with a double clutch it goes in without drama or noise. but really, if someone teaches you how to properly do it, you could be able to do it in a few days, but to truely master it in speed and more importantly SMOOTHNESS takes years of practice either on the track or street.

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  7. #51
    Registered User teflon_jones's Avatar
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    Quote Originally Posted by subaru_crazy View Post
    If you downshift and don't revmatch then you are wearing out your synchros, yes the truck drivers down shift but most big rigs have what is called the "engine break" so its not like downshifting its another piece of hardware in the engine. So downshifting is fine when you revmatch otherwise you will have problems with shifting into gears and will start to grind when doing so.
    Sorry but that's not how an engine brake aka "jake brake" works. It fully uses the clutch, transmission, and rest of the drivetrain just as much as downshifting without engine braking. All that happens is an extra valve opens on the cylinders to allow the compressed air generated on the upstroke out so it doesn't transfer power back to the downstroke of the piston.
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  8. #52
    Registered User Mr.NiceGuy's Avatar
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    Quote Originally Posted by TheJ View Post


    Sophie the tranny says "it's all about moderation".
    Lol


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  9. #53
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    I always thought the purpose of rev-matching was to avoid the possibility of compression locking the rear wheels (in a RWD obviously) when under heavy braking when all the weight is off them. I actually compression locked my old 300ZX when I was changing down going into a corner in the wet. I slipped off the clutch a bit quick, oops.

    I frequently use the gearbox rather than the brakes to slow a little. Normally when coming into a corner. I find this balances the car a lot better than the brakes, and gives better control around the corner. I've always done this in every manual car I've owned. Never worn out a clutch or gearbox.

    Admittedly, I have generally done this smoothly and not just 'slammed' it down through the gears.

    Also, I've never been able to heel-toe to rev match. Curse my Sideshow Bob feet. :-/

  10. #54
    Registered User gregroot198521's Avatar
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    Quote Originally Posted by Mr.NiceGuy View Post
    Lol
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    5 year bump, huh? Bravo.
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  12. #56
    Registered User Mr.NiceGuy's Avatar
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    Man! Second time I did this, I gotta start paying attention to the dates! That tranny thing was so funny and I got caught up.


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  13. #57
    Registered User gregroot198521's Avatar
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    Quote Originally Posted by TheJ View Post
    Lol there is no law against a random old thread bump once in a while.
    Damnit, I forgot the sarcasm font again.......
    Quote Originally Posted by Mr.NiceGuy View Post
    Man! Second time I did this, I gotta start paying attention to the dates! That tranny thing was so funny and I got caught up.
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  14. #58
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    Rev match on the street, heel-toe on the track. Done properly, rev matching will reduce a lot of clutch wear and make the ride smoother. I simply have paid attention to where the revs are at in different gears at speeds and find it easy to rev match. I also don't do it to excess.....but downshifting from fourth to third at 45 is not excessive. Quick throttle blip to about 3k on the tach....and you're there. I don't think there is any chance of harming the syncros when done right.
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