I was wondering what you all know about rev matching when shifting. I was told that you can shift (manual) without using the clutch pedal and just moving the stick into gear as long as the rpms match. I tried this and it works fine, but I was wondering if it is bad for the car or anything else I should know.

 

Yea...but why?

I heard you can ride on your rims without tires...

 

lol thats a good one. made me laugh.

 

Same here

 

lol...

as for shifting like that, seems like it's something really hard on the tranny...doesn't sound like a good idea

 

good way to kill your synchros.

 

the only reason to rev match and shift w/o clutch would be when your clutch is completely out and you need to drive your car to a shop or something similar. it will def. kill your synchros if you do it for a long time and your tranny will basically be screwed,

 

i had a 93 escort that i didin't clutch for about 50% of the 25,000 miles i put on it. never shoved it into gear or anything but let it ease in there as the rpms go down. every once in a while i do it in the max but i try not to. i usually always do it at stop signs though putting it into first. and i disagree with maximazation...try delivering pizza 40 hours per week

 

Yes, its certainly possible. But you will still abuse the synchros some since the countershaft won't be spinning at the right rpm (even if the engine and driveshaft are matched). And the synchros get smacked from it - usually you'll see the teeth are bent on one side - they work, but don't work great. If you're going to try it, start with a relatively tame shift like 3rd->4th, and focus on the tempo to catch the engine at the right RPM.

So IMO, you have a clutch, you'd be a fool to not use it all the time.

Dave

 

Why? I have a clutch so I use it.

 

Definitely something that should be learned if you have a 5 speed, but not something to utilize everyday, use for emergencies.

 

i know you can go from 1st to 2nd rev to 2300 then pull down to 2nd at around 2000 it will go into 2nd.

 

So in the case of a failed master or slave cylinder (not too expensive to fix), you're advocating risking the transmission internals to get home? The price of once clutch hub sleeve would pay for the tow.

I admit I tried it a few times once. Then I realized it was pointless and foolish since I've driven 200k miles on various m/t cars without a clutch failure.

Dave

 

You do this to do left foot breaking, and yes its freaking terrible on your transmission. Supposivly cars that the racers do this on tear trannies within a month.

 

im going to remember ur name so when u make a " my tranny is shot how do i install a 6-speed thread" i cant throw this back into ur face

 

Wait a mintue to unstand this thread correctly you can shift (5speed) down a gear without using the clutch? I have a feeling he's an auto saying this but just need some clarification cause if this is 5speed talk I've never heard of this before.

 

Yes, it is possible to shift a manual transmission without using the clutch. Autos don't have clutch pedals

The risk is that if you don't match it right, you have the engine turning shaft going into the transmission and the momentum of the car turning the output shaft. THAT is plenty of power to grind synchros, clutch sleeves, keys, and gear teeth.

Dave

 

Well auto do have a clutch but its an automatic clutch but yea. . . . Wow I didnt know it was possible on a manual well I'll be glad to never try it but I guess its good to know if needed in an emergency.

 

If you do this absolutely correctly there is no way you can do any damage to your tranny at all. The problem is that doing incorrectly, even a few times, can really screw things up hardcore. Unless you are racing on a professional level (where they do it as much as possible because every 1/100th of a second counts), I can't think of any reason you would actually want to do this. The chances of having an unneccessary repair to perform is just too great.

 

They don't do it as much as possible - depending on the class, the transmission may not last the race. Plus, they're doing it with dog-tooth transmissions, where there are no synchros to grind and the gears are an order of magnitude stronger under shock loads.

Dave

 

As long as you match the RPMs perfectly, you won't wear your syncros any more than you would with normal shifting. The only way to minimize syncro wear is to double-clutch. The mainshaft will be spun up by the syncros in every case (except double-clutching).

I don't see the point in shifting this way, but I figured I'd point out that, if done perfectly, it's about as harmful as regular shifting.

 

Proof =)

I drove it out of the garage and back in on rims... peeze beyotches

 

thats how my car looked when i bought it

 

lol funny. any more pics of the car?

 

Ya.....

 

nice looking max. post pics of it when it is fully done. what color is that also?

 

what exactly is double clutching?

 

yeah my friends dad used to have a 5.0 mustang back in the day and he'd shift it without the clutch all the time. Then again, he did go through 2 transmissions in 40k miles...The synchros usually spin up the shaft when it is not yet connected to the wheels...without the clutch they have to spin up shaft when it is connected to the wheels already. This is bad

 

put clutch in, shift to neutral, put clutch out, rev engine to match next gear, put clutch in, put in gear, put clutch out

this basically lets the driver perform the task of the synchros, spinning up the shaft in the transmission to the proper speed before engaging the next gear.

the act of shifting to neutral between every shift takes a long time and this is why synchros were invented long ago. If you notice that semi trucks shift very slow, this is becuase they don't have synchros and must double clutch every shift.

nowadays double clutching is usually used for only downshifts, which are otherwise very hard on the synchros. If you double clutch every shift your transmission will love you but your thrust bearing and the guy stuck behind you at the light will hate you, its a tradeoff. They give you synchros for a reason...

if you have a manual you should learn to....
double clutch
drive without clutch
heel and toe
engine brake

this stuff all has its useful moments, especially double clutching which good drivers do on every downshift.

 

people in china drive w/o clutching all the time, i talked to this one guy who gave me a ride in his suzuki down there, he said he never had to replace his tranny or clutch, he had around 350,000km on his car too.

 

what are synchros??

 

http://auto.howstuffworks.com/

and more specifically:
http://auto.howstuffworks.com/transmission.htm

 

long beach blue is the color