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Home > Performance Mods > Transmission / Drivetrain > Rev Matching *Info*

Rev Matching *Info*

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justDstart3
Camp Pendleton
California, US
  • Vehicle Designer
 well i was just readin a thread and someone asked to post a thread bout rev' matching. but i only know the simple basics bout it.. but i know theres others who know the depth info bout rev. thats all.. haha.. But heres Some info i retrieved.


Rev matching: this alone has no effect, good or bad, on syncros; but it does save wear on the clutch and the rest of the drivetrain. By rev matching during a downshift you're providing exactly the same function - in reverse - as occurs naturally during a normal upshift.

On the upshift, when you lift off the gas momentarily engine revs drop...and if you time it correctly the drop at least approximates the difference in engine revs between the previous gear and the one you just shifted up to. So when you let out the clutch the engine/flywheel, on one side, and clutch disc/transmission on the other side are spinning at (or close to) the same speed; no lurching, bucking, etc. as you release the clutch.

On the downshift the "natural" factors that help the upshift are now working against you. So you have to supply the speed matching - by revving the engine - to get the same match across the clutch interface.

If you don't rev match on the downshift, it's just like holding the revs at the same level during an upshift: the clutch has to slip, just like when starting out from a stop, until the engine speed and trans speed match.

All of this has no effect on what happens when you move the shift lever between gears: the syncros take the hit, doing the internal speed matching between gear set in the trans - exactly analogous to what the clutch does between engine and trans when you don't rev match the shift. Since the clutch is disengaged while you're performing the gear shift you can't affect the internals of the trans, except via the shift lever.

So what you gain by rev matching is smoother driving, and reduced clutch wear, plus reduced wear on the rest of the drivetrain if you weren't slipping the clutch much . Which brings us to... Double Clutching. *thats a different Thread*


If theres more to it. Post it. *info found on a different site. not takin credit for someone else info* just a topic of spreading the word and understand it..



"Passion is in the blood. Desire is in the will. Prepare to be mentally strong. Till the day the earth stood still. Everyone in the world will turn. Up as they glance upon you. Everyone will witness as your weakness will burn. As you will be reborn to someone true. The passion, desire and will is all you need in life." *by me*
[#] Feb 25, 2008 02:58pm
FrAnkRYzzO
Perry Hall
Maryland, US
  • $upervillain
    for Hire
 Good stuff!

The site this came from is http://forums.nasioc.com/forums/showthread.php?t=804223



...............

Search or one of these adorable kittens WILL DIE!
[#] Feb 25, 2008 03:28pm
Orin
Auburn
Alabama, US
nice!

moved to Transmission/Drivetrain

[#] Feb 25, 2008 03:30pm
justDstart3
Camp Pendleton
California, US
  • Vehicle Designer
 coo thanks for the relocation.. and thanks for the link.. i just didnt want to claim n e thing that didnt came from me..



"Passion is in the blood. Desire is in the will. Prepare to be mentally strong. Till the day the earth stood still. Everyone in the world will turn. Up as they glance upon you. Everyone will witness as your weakness will burn. As you will be reborn to someone true. The passion, desire and will is all you need in life." *by me*
[#] Feb 26, 2008 01:22pm

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