Does anyone make a wheel side tach for rev matching?

Teh Unfertaker · 12-11-2005, 03:57 AM

I was just reading the manual thread and someone was explaining how to rev match on a down shift and a thought hit me, why not put a small hand on the tach that showed you the rpm of the wheels. That way you just popped the clutch and matched the needles. No experience with the car necessary. I understand that purists can do this implicitly but it would make it easier for the lay person to pick up.

So does it exist, or did I just make it up?

James Crivellone · 12-11-2005, 04:01 AM

It would make things tricky because of gearing to the wheels.

If you change tire sizes its off
If you change differential gearing its off

etc

For a stock feature, it could be nice, in my car it would be impracticle as I already know how to revmatch, and I don't run a stock driveline configuration when it comes to gearing.

Teh Unfertaker · 12-11-2005, 04:18 AM

I don't think either of those things would matter, if you just measure the speed farther back. If you measure the shaft speeds on both pieces, right where they mate, then everything is already factored in when you take the measurements.

prometheum · 04:59 AM

yeah its called a speedometer

and the speed you need to rev match dictated by what gear you want to go into....so you need to make a machine to read minds first

g · 12-11-2005, 05:23 AM

Just hit the throttle momentarily when shifting down.. Usually sufficient

SliP · 12-11-2005, 09:20 AM

Quote:

Originally Posted by g

Just hit the throttle momentarily when shifting down.. Usually sufficient

qft.

Tongboy · 12-11-2005, 09:45 AM

prometheum is right, the speedometer measures what the final drive is spinning at, the other side of the tranny, you match up that with the engine revs and you have a revmatch, you just have to get used to where that is with each gear. it would be kind of neat to see something like that setup, would need to know what gear the car was in and the translation of revs to the speedometer output and it could then display that

lemcool · 12-11-2005, 10:03 AM

yeah, haha, i posted that. takes a week of practice, tops. Dont worry about it. With my car, the RPM should always be ~1k higher than it was in the higher gear. As I go into smaller gearing, espescially at higher RPMs, it gets to be about 1.5k.

So 4500 rpm in 5th, drop to 4th should be about 55rpm. About.

JayDubs · 12-11-2005, 10:11 AM

Why? No need really, not in a street driven car at least

Major Fudge Packer · 12-11-2005, 11:28 AM

Pointless, because when revmatching youre not worrying about the speed of the wheels, youre worrying about the difference in the engine RPM versus the RPM of the input shaft of the transmission. Wheel RPM doesnt matter, because its been changed by the gearing.

Baska · 12-11-2005, 11:57 AM

Doesn't really matter in a street car thanks to synchros

Gravity Man · 12-11-2005, 01:06 PM

Quote:

Originally Posted by JayDubs

Why? No need really, not in a street driven car at least

Saves unnecessary wear and tear on the clutch, and makes downshifts smoother and more comfortable for your passengers (especially the lady ones).

prometheum · 12-11-2005, 01:55 PM

Quote:

Originally Posted by Gravity Man

Saves unnecessary wear and tear on the clutch, and makes downshifts smoother and more comfortable for your passengers (especially the lady ones).

yeah thats why you double clutch...and you dont need some stupid guage to tell you how to do it

ice109 · 12-12-2005, 01:45 AM

Quote:

Originally Posted by Baska

Doesn't really matter in a street car thanks to synchros

prometheum · 12-12-2005, 01:56 AM

Quote:

Originally Posted by Baska

Doesn't really matter in a street car thanks to synchros

synchros dont increase your engine speed to match the transmission's speed; thats what rev matching does....increases your engine speed to save wear on your clutch. synchros help change the input shaft speed to the appropriate speed depending on what gear you are trying to select

prometheum	yeah its called a speedometer and the speed you need to rev match dictated by what gear you want to go into....so you need to make a machine to read minds first __________________ Member of the Gen[M]ay Grammar Nazi Association™ Commander of [M]ilitary [M]ayhem Club™ Last edited by prometheum; 12-11-2005 at 04:59 AM..
12-11-2005, 04:39 AM	#4

g Zen04	Just hit the throttle momentarily when shifting down.. Usually sufficient __________________ UT Pwnage participator _ uk KREW _ aka Zen04 b82f8b0c755a609577841212ffcb9726 [y yuo throw haet :( :(] porn may <3's yuo.
12-11-2005, 05:23 AM	#5

lemcool notyou	yeah, haha, i posted that. takes a week of practice, tops. Dont worry about it. With my car, the RPM should always be ~1k higher than it was in the higher gear. As I go into smaller gearing, espescially at higher RPMs, it gets to be about 1.5k. So 4500 rpm in 5th, drop to 4th should be about 55rpm. About. __________________ I am notyou. seriously.
12-11-2005, 10:03 AM	#8

Major Fudge Packer Sgt Major	Pointless, because when revmatching youre not worrying about the speed of the wheels, youre worrying about the difference in the engine RPM versus the RPM of the input shaft of the transmission. Wheel RPM doesnt matter, because its been changed by the gearing. __________________ Insert Sig Here
12-11-2005, 11:28 AM	#10

Teh Unfertaker	I don't think either of those things would matter, if you just measure the speed farther back. If you measure the shaft speeds on both pieces, right where they mate, then everything is already factored in when you take the measurements. __________________ <--- isn't interesting enough to have a signature
12-11-2005, 04:18 AM	#3

JayDubs	Why? No need really, not in a street driven car at least __________________ c7b3cdf1e93480dca1b094525eb8b1
12-11-2005, 10:11 AM	#9

Baska I post pictures of my vagina. Ask me and I'll post it if I have time to take fresh pics	Doesn't really matter in a street car thanks to synchros
12-11-2005, 11:57 AM	#11