WHY?
Zombie Defense Force
Joined: Jan 2005
Posts: 7,782
From: Dallas
RE: WHY?
ya i could do that in the audi. i would just let the rpms fall down and apply slight pressure and it wouldnt go in tell the right rmps came upp. then it would just glide in. no jerking or shaking or anything.
ORIGINAL: Trey25
Slightly off topic but I have seen ppl shift without using the clutch. Its like they know exactly when to shift without grinding the tranny.
Slightly off topic but I have seen ppl shift without using the clutch. Its like they know exactly when to shift without grinding the tranny.
1st Gear
Joined: Sep 2006
Posts: 268
From: Westchester, NY
RE: WHY?
Shifting without using the clutch is called powershifting. We use it down here sometimes when doing a dyno pull. It will knock a second or two off your 0-60 but people are right here in saying that its def not good for the tranny or clutch. But for the fastest times it does work. I would NOT recommend shifting that way on your stock car though.
Zombie Defense Force
Joined: Jan 2005
Posts: 7,782
From: Dallas
RE: WHY?
well when i did it. very very rarely i wouldnt force it in i would just let it pop in by it self
ORIGINAL: Ford2Audi6
Shifting without using the clutch is called powershifting. We use it down here sometimes when doing a dyno pull. It will knock a second or two off your 0-60 but people are right here in saying that its def not good for the tranny or clutch. But for the fastest times it does work. I would NOT recommend shifting that way on your stock car though.
Shifting without using the clutch is called powershifting. We use it down here sometimes when doing a dyno pull. It will knock a second or two off your 0-60 but people are right here in saying that its def not good for the tranny or clutch. But for the fastest times it does work. I would NOT recommend shifting that way on your stock car though.
2nd Gear
Joined: Aug 2006
Posts: 619
From: NY
RE: WHY?
For those of you that don't know, check out howstuffworks.com and search manual transmission.
http://auto.howstuffworks.com/transmission.htm
The first part there shows generally how the manual tranny works. Shifting without the use of the clutch involves the synchronizers (bottom of the page).
QUOTE:
Synchronizers
Manual transmissions in modern passenger cars use synchronizers to eliminate the need for double-clutching. A synchro's purpose is to allow the collar and the gear to make frictional contact before the dog teeth make contact. This lets the collar and the gear synchronize their speeds before the teeth need to engage, like this:
Basically, the synchros match the speed of the tranny to the speed of the engine, and then the gear teeth engage. The clutch/synchros etc all work together to shift the car.
The way to shift without the use of the clutch is by matching the engine speed to the tranny speed without the use of the synchros. This is done by matching engine RPM to the RPM of the tranny at the next gear you want to shift into. This is called rev matching.
Well this is the technical mechanics behind it. It not recommended that you do this, however it is safe to do if you do it correctly. If you want to learn, please learn on your friends Hyundai and not on your beautiful Audi. I hope some of you find this helpful.
http://auto.howstuffworks.com/transmission.htm
The first part there shows generally how the manual tranny works. Shifting without the use of the clutch involves the synchronizers (bottom of the page).
QUOTE:
Synchronizers
Manual transmissions in modern passenger cars use synchronizers to eliminate the need for double-clutching. A synchro's purpose is to allow the collar and the gear to make frictional contact before the dog teeth make contact. This lets the collar and the gear synchronize their speeds before the teeth need to engage, like this:
Basically, the synchros match the speed of the tranny to the speed of the engine, and then the gear teeth engage. The clutch/synchros etc all work together to shift the car.
The way to shift without the use of the clutch is by matching the engine speed to the tranny speed without the use of the synchros. This is done by matching engine RPM to the RPM of the tranny at the next gear you want to shift into. This is called rev matching.
Well this is the technical mechanics behind it. It not recommended that you do this, however it is safe to do if you do it correctly. If you want to learn, please learn on your friends Hyundai and not on your beautiful Audi. I hope some of you find this helpful.
2nd Gear
Joined: Aug 2006
Posts: 619
From: NY
RE: WHY?
Oh and to answer the original post.
0-60 numbers are usually produced by launching the crap out of the car and shifting perfectly (all the way to redline and shifting very quickly, sometimes without the clutch), then taking the best numbers out of many runs. It can be difficult to match posted 0-60 times yourself. I wouldn't want to launch the car as hard as would be necessary to match posted numbers.
Generally, if your car doesn't seem to go as fast as posted numbers, it is due to the skill of the driver. You can easily lose a second just in your launch. This doesn't mean that your car hasn't lost a little bit of power, but more than likely most of the time you lose is due to your lack of driving skill/knowledge. Don't feel bad though, most of us are in the same boat, myself included.
NOTE: Posted times also aren't always the absolute fastest time produced at the track. Many manufacturers will add a few tenths to what they were actually able to achieve, however it is still very tough to hit the manufacturer posted numbers.
0-60 numbers are usually produced by launching the crap out of the car and shifting perfectly (all the way to redline and shifting very quickly, sometimes without the clutch), then taking the best numbers out of many runs. It can be difficult to match posted 0-60 times yourself. I wouldn't want to launch the car as hard as would be necessary to match posted numbers.
Generally, if your car doesn't seem to go as fast as posted numbers, it is due to the skill of the driver. You can easily lose a second just in your launch. This doesn't mean that your car hasn't lost a little bit of power, but more than likely most of the time you lose is due to your lack of driving skill/knowledge. Don't feel bad though, most of us are in the same boat, myself included.
NOTE: Posted times also aren't always the absolute fastest time produced at the track. Many manufacturers will add a few tenths to what they were actually able to achieve, however it is still very tough to hit the manufacturer posted numbers.
2nd Gear
Joined: Jul 2005
Posts: 1,087
From: Denver
RE: WHY?
it is kinda like when you see the car commericals and it says on the bottom in same letters professional driver on a closed course they may say that car can do 0-60 in 7.1 but they never say anyone can do that in this car
2nd Gear
Joined: Aug 2006
Posts: 533
From:
RE: WHY?
ORIGINAL: TDRILL
For those of you that don't know, check out howstuffworks.com and search manual transmission.
http://auto.howstuffworks.com/transmission.htm
The first part there shows generally how the manual tranny works. Shifting without the use of the clutch involves the synchronizers (bottom of the page).
QUOTE:
Synchronizers
Manual transmissions in modern passenger cars use synchronizers to eliminate the need for double-clutching. A synchro's purpose is to allow the collar and the gear to make frictional contact before the dog teeth make contact. This lets the collar and the gear synchronize their speeds before the teeth need to engage, like this:
Basically, the synchros match the speed of the tranny to the speed of the engine, and then the gear teeth engage. The clutch/synchros etc all work together to shift the car.
The way to shift without the use of the clutch is by matching the engine speed to the tranny speed without the use of the synchros. This is done by matching engine RPM to the RPM of the tranny at the next gear you want to shift into. This is called rev matching.
Well this is the technical mechanics behind it. It not recommended that you do this, however it is safe to do if you do it correctly. If you want to learn, please learn on your friends Hyundai and not on your beautiful Audi. I hope some of you find this helpful.
For those of you that don't know, check out howstuffworks.com and search manual transmission.
http://auto.howstuffworks.com/transmission.htm
The first part there shows generally how the manual tranny works. Shifting without the use of the clutch involves the synchronizers (bottom of the page).
QUOTE:
Synchronizers
Manual transmissions in modern passenger cars use synchronizers to eliminate the need for double-clutching. A synchro's purpose is to allow the collar and the gear to make frictional contact before the dog teeth make contact. This lets the collar and the gear synchronize their speeds before the teeth need to engage, like this:
Basically, the synchros match the speed of the tranny to the speed of the engine, and then the gear teeth engage. The clutch/synchros etc all work together to shift the car.
The way to shift without the use of the clutch is by matching the engine speed to the tranny speed without the use of the synchros. This is done by matching engine RPM to the RPM of the tranny at the next gear you want to shift into. This is called rev matching.
Well this is the technical mechanics behind it. It not recommended that you do this, however it is safe to do if you do it correctly. If you want to learn, please learn on your friends Hyundai and not on your beautiful Audi. I hope some of you find this helpful.
2nd Gear
Joined: Aug 2006
Posts: 619
From: NY
RE: WHY?
You did say synchromesh and rev matching. I thought my post was a little more in depth. The link to how these things actually work I thought was helpful and may help people understand what is actually happening in the car. Its one thing to understand how to shift without the clutch (just match revs), and another to understand the why and the mechanics behind it. Perhaps you dissagree.
If you are asking how to shift without the clutch, I doubt you would know what the hell a synchromesh is or what it does without a description and some pics.
If you are asking how to shift without the clutch, I doubt you would know what the hell a synchromesh is or what it does without a description and some pics.