Can rev-matching be bad? I know it sounds dumb but i've been starting to practice doing it downshifting 5-4 and 4-3 under normal conditions. It seems 100% logical but if it were better for the car then why is it not in the manuals or taught in drivers ed? Is it because it's a more "advanced" technique?

 

it's alot better on the clutch than letting it slip.

It's probably not taught b/c it's kinda like trying to rub your stomach and pat your head at the same time

 

Are there any negatives at all? What if done wrong? By the way, is the 3-2 shift harder to rev-match because it is for me.

 

it's better to err on the reving a little high than t00 low, but really no negatives.

5>4, 4>3, 3>2, 2>1 are all easy to do in my car. It becomes a lot easier after the car is really warmed up though.

 

When Road Racing, rev-matching is imperative when downshifting ... so you don't upset the balance of the car when braking for turn-in. Also, it will ensure that you are in the optimum gear when you accelerate out of the turn. Under daily driving situations ... it's not nessecary.

 

We have drivers in this country that can hardly handle their automatics out on the road.

-Floyd

 

Many race cars don't have synchro's in the gearbox, so rev matching is necessary. It is a good idea for you to rev match anyway so you don't upset the balance of your car in a turn. Its even better to double-clutch to rev match.

 

yeah, what exactly is double clutching. Is it the same as heel to tow??? Am I making any sense at all?

 

Double clutching is when you put the car in neutral, blip throttle, then put it in gear.

How is that, won't double clutching take a bit longer?


[Modified by Stumpy, 2:39 PM 12/28/2001]

 

I thought first gear didn't have a synchro, so that (down) shifting into first while moving (2>1) isn't a good idea!?...

 

I second this.

Even if you are just rolling, you should use 2nd instead of 1st (daily driving at least).

 

nope, i do it all the time. 1st definatly has a syncro, reverse doesnt.

 

quote: Double clutching is when you put the car in neutral, blip throttle, then put it in gear.

Is this while upshifting or downshifting? and if you could explain a little better comparing rev matching, heel to tow, and double clutching and when to use what.


If someone could provide this info that would be great! Thanks.

 

i cant go 2>1 that easily in my car. i have to be going ilke 1 mph

 

yeah, my 1st is pretty though to get back into. every other gear is fine though .

 

Actually, I was playing around one time and I was able to get it into 1st from 2nd pretty effortlessly just by giving the accelerator a nice friendly blip.

 

Double clutch can be use for both upshift & donwshift

 

Double clutching is best for downshifting. Let's take an example that you want to shift from 5th to 4th. From 5th gear, you press in the clutch and shift to neutral. Let out the clutch (often forgotten) and blip the throttle. Then, quickly (before the rev's fall) press in the clutch and shift into 4th, then let out the clutch to be in gear. The purpose of double clutching is to get the input shaft spinning the same speed as the output shaft. When you downshift without double clutching, you're only able to match the engine's rev's to the input shaft's rev's. Double clutching is easier on the synchro's. You should have time to double clutch on the track in most hard braking corners.

You can double-clutch for upshifting, but there's not much benefit, and it does take longer to accomplish when you'd rather be hard on the gas.

Heel-toe is the method of blipping the throttle with your foot whileyou're still on the brakes. You really don't use either your heel or toe. This weird term came from the days when race cars had the throttle pedal in-between and lower than the clutch (left) and the brake (right). You would hit the brake with your right toe and blip the throttle with your right heel. Nowadays, the throttle is usually on the right side, so the term heel-toe is kind of antiquated.

 

Thanks! I needed that, I guess i can pack up an go home for the day now.

 

isn't this rev-matching??

 

double clutching is for transmissions without syncros...

 

Well I have been blipping the throttle between gears, is that rev-matching or double clutching?

 

How do you rev-match without double clutching?

 

double clutching is when you put it in neutral before you blip and down shift
but rev matching is when you just down shift and blip
double clutching is explained well in the last answer.
also a example remember when you were younger and was on a school bus
if you were watching the driver they must double clutch in order to shift
they need to match the the speed of the engine and the transmittion. (something like that)

but now a days lot of people say double clutching and rev matching are the same

remember gasing while shifting up/down waste gas
i guess thats the only bad thing
but better then burning the clutch all the time


[Modified by nevergiveup, 4:09 AM 12/30/2001]

 

If you double clutch and rev match you shouldn't have a problem. I can go from 2nd into 1st as when traveling at 30 mph.

I've tried this in a GSR going 10~15 mph and was able to go from 2>1 by using the double clutch - rev match technique.