Hey guys i was driving a standard pickup truck and i reved match and the guy next to me said dont do that again youll lose a gear if you keep rev matching. i would like to prove him wrong that rev matching is actaully good then just dropping it in gear. Thanks guys

you mean shifting wihtout the clutch when you say rev matching? If so, then yeah, its not great to do as it can cause extra wear on the syncronizers

i thought he was talking about reving it to downshift, in that case its good

First time I've heard the term ~ I have heard of 'double clutching'

Shummy ~

Yea sorry i mean when you rev match while down shifting so i guess its is good to do that

Similar to a motorcycle I assume?

Dan

I rode with a guy the other day that did it. It was the first time I had ever seen anyone drive like that! Seemed a bit radical to me but maybe its easier on the clutch?? Any particullar reason for doing it?

hmmm...

I always double clutch it as habit whenever I drive a manual because almost every of the manual things that I drive have no synchro.... 1933 International B3 stake bed (NO synchro whatsoever, full crashbox) and a 1967 beetle (synchros are shot).

I wouldnt think it would hurt it on the downshifts??

Double Clutching is great for the tranny. It reduces the work needed by the synchros and reduces wear on them.
ac

In trucks tike these I would say double clutching would be best these trannys arent bulletproof and you can cause alot of extra wear on the synchros. I think what he means is reving the engine to find the gear while down shifting??? When I drive semi I do this alot I never use the clutch unless im taking off butt....alot heavier trans and a totally different application.

Double clutching puts less strain on the syncros, in fact like DURAtotheMax said you don't even need syncros to shift down or up for that matter. If you just slip it out of gear and rev to down shift then yes, you are making the syncro work harder than if you used the clutch. I used to do that a lot on my 89 hand shaker and when we rebuilt the trans the syncros were pretty worn.

well i always figured that if the truck shutters or jurks when you let off the clutch(normal shift) and it dont when you rev match then its gotta be easier on every thing not just the tranny/clutch but rear end drive shaft and tranfer case. i do it in my umm my mustang (covers for flaming)

I assume you mean downshifting with the clutch, its obvious that you have to match speeds without the clutch. I always do this with my handshaker, its smoother and it doesnt jerk the drivetrain. Like on an exit ramp, ill clutch, rev, drop into 5th and let out the clutch, no slip, engine and trans are going the same speeds. Good practice. Shifting without the clutch its obvious you need to match speeds, however on a syncronized trans no matter how close you have the speeds matched your probably not close enough and putting a lot of wear on the syncros. Better to use the clutch.

I assume you mean downshifting with the clutch, its obvious that you have to match speeds without the clutch. I always do this with my handshaker, its smoother and it doesnt jerk the drivetrain. Like on an exit ramp, ill clutch, rev, drop into 5th and let out the clutch, no slip, engine and trans are going the same speeds. Good practice. Shifting without the clutch its obvious you need to match speeds, however on a syncronized trans no matter how close you have the speeds matched your probably not close enough and putting a lot of wear on the syncros. Better to use the clutch.
my mustang falls into gear by it self. i just hold the shift lever with light pressure and when the engine matches it falls nice and smooth into gear. up and down. i would bolt the engine to the tranny and ditch the cluth all together if i didnt have to stop.

on some trans's its a LOT harder...

obviously on older trans's with no synchro at all it is hardest. While I can shift our old 1933 truck without grinding any gears, I cant do it without the clutch. It took a LOT of practice to be able to shift the old truck without grinding anything or having to stop completely and start over again. On the old truck its: Rev up to "top" of current gear, clutch, neutral, let clutch out, bump accellerator a bit and then simualtaniously press clutch in and lightly try to move the shifter into next gear while carefully "feeling" for the next gear to mesh, once you feel the gears mesh, pull it fully into the next gear, let the clutch out, and off you go.

the beetle on the other hand is stupid easy for some reason. I can shift it without even using the clutch all day long.

I understand the old old 1930's Bentley's will make anyone look like a fool the first time they drive it ):h .

ben

grind em till ya find em...

i learned on a an ol 58 grain truck 3+2 with a 2 speed rear end that is 12 unsynchro gear shift:eek: with a i-6 300CI motor. i have a lot of embarissing moments in that truck:D after a while i could do it little to no clutch

With the dual disc"rev matching" has become common practice when downshifting!

I have never heard it called that. I have done it in my truck. Normally I just coast with light brake pressure and pull it into 3rd as I am almost stopped. It slides right in.

I have powershifted as well. If timed correctly, it works fine, if not she grinds bad.

it is standard procedure for me to do that on my R6, It would make sence to do it on the truck too.