Granny Shifting???
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Burning Brakes
Joined: May 2001
Posts: 1,188
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From: Dallas TX
Granny Shifting???
What is granny shifting? What about double clutching? Side stepping? I think I have a general idea, but I would like to know exactly what is means. Thanks! :cheers:
Pro
Joined: Jul 2001
Posts: 733
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From: The inmates are running the asylum... San Jose, CA
Re: Granny Shifting??? (RajunCajun2001)
Double clutching is used for older cars that don't have modern synchros and for newer cars whose clutch is getting worn out.
To double clutch
1. Step on the clutch
2. Take the car out of gear
3. Release the clutch
4. Rev the engine
5. Engage the clutch
6. Put the car in gear
7. Blip the throttle again
8. Release the clutch
Or something close to that. You shouldn't need to do it with a C5 AFAIK.
To double clutch
1. Step on the clutch
2. Take the car out of gear
3. Release the clutch
4. Rev the engine
5. Engage the clutch
6. Put the car in gear
7. Blip the throttle again
8. Release the clutch
Or something close to that. You shouldn't need to do it with a C5 AFAIK.
Melting Slicks
Joined: Oct 2001
Posts: 2,480
Likes: 0
From: Wa.
Re: Granny Shifting??? (Reeves)
Granny shifting is shifting normally - like if a police officer is following you.
Double clutching is when you let the clutch out between gears to use the engine RPM to either speed up or slow down the gears in the tranny(used in the old days before syncro's were used.
Side stepping is when (at a dead stop) you floor the gas and let your foot slide off the side of the clutch pedal- use this method whenever you feel the need to spend lots of money and to have your car rest in the service dept. for a long period of time. :yesnod:
Double clutching is when you let the clutch out between gears to use the engine RPM to either speed up or slow down the gears in the tranny(used in the old days before syncro's were used.
Side stepping is when (at a dead stop) you floor the gas and let your foot slide off the side of the clutch pedal- use this method whenever you feel the need to spend lots of money and to have your car rest in the service dept. for a long period of time. :yesnod:
Racer
Joined: Oct 2001
Posts: 442
Likes: 2
From: San Clemente CA
Re: Granny Shifting??? (RajunCajun2001)
Granny shifting is shifting like your grandmother! The denotation is that you are really taking it easy on your equipment.
Double clutching is a technique used to match the rpm of the engine to the rpm of the next gear you will be selecting. In a modern transmission, all of the gears are turning all of the time. This is called “constant mesh”. The synchros engage one gear set at a time to the output shaft. Since all the gears have different gear ratios, they are turning at different speeds at the same engine rpm.
The synchros are little clutches who’s job it is to match the speed of the of the inputshaft/countershaft to the outputshaft. When you disengage the clutch and move the shifter, the synchro accelerates the mass of the input/countershaft. This is the whirring sound you hear when you shove it into 1st gear as you are coming to a stop. When you double clutch, you reduce the speed differential between the shafts and the synchros have an easier task.
Example one; down shifting. You are at 80 mph in 5th gear at 2500 rpm and a pesky Porsche wants to race. You are going to shift into 3rd to maximize your acceleration but you want to be smooth, easy on the synchros and impress your woman doing it. Your steel trap mind estimates that 80 mph in 3rd gear is ~4400 rpm so you quickly shift into neutral and let out the clutch. Then, you quickly rev the engine and depress the clutch just as the tach hits 4400 rpm. In one sweeping motion you simultaneously depress the clutch, effortlessly engage 3rd gear and release the clutch to unleash the dominating power of your LSX. What a magnificent display of driving prowess. You’re going to get lucky!
Sidestepping the clutch is when you hold the clutch down to the floor and to release it, you slide your foot sideways off of the pedal! Not a subtle technique but it’s the quickest way to engage the clutch and will maximize the impact to the driveline, if that’s what you’re interested in.
Have fun,
Steve
Double clutching is a technique used to match the rpm of the engine to the rpm of the next gear you will be selecting. In a modern transmission, all of the gears are turning all of the time. This is called “constant mesh”. The synchros engage one gear set at a time to the output shaft. Since all the gears have different gear ratios, they are turning at different speeds at the same engine rpm.
The synchros are little clutches who’s job it is to match the speed of the of the inputshaft/countershaft to the outputshaft. When you disengage the clutch and move the shifter, the synchro accelerates the mass of the input/countershaft. This is the whirring sound you hear when you shove it into 1st gear as you are coming to a stop. When you double clutch, you reduce the speed differential between the shafts and the synchros have an easier task.
Example one; down shifting. You are at 80 mph in 5th gear at 2500 rpm and a pesky Porsche wants to race. You are going to shift into 3rd to maximize your acceleration but you want to be smooth, easy on the synchros and impress your woman doing it. Your steel trap mind estimates that 80 mph in 3rd gear is ~4400 rpm so you quickly shift into neutral and let out the clutch. Then, you quickly rev the engine and depress the clutch just as the tach hits 4400 rpm. In one sweeping motion you simultaneously depress the clutch, effortlessly engage 3rd gear and release the clutch to unleash the dominating power of your LSX. What a magnificent display of driving prowess. You’re going to get lucky!Sidestepping the clutch is when you hold the clutch down to the floor and to release it, you slide your foot sideways off of the pedal! Not a subtle technique but it’s the quickest way to engage the clutch and will maximize the impact to the driveline, if that’s what you’re interested in.
Have fun,
Steve
