Someone Explain Why Skip Shifting Is Bad
06-07-2013, 07:59 AM
#1
Someone Explain Why Skip Shifting Is Bad
I've repeatedly seen members claim it is bad to skip shift on these transmissions. As in from 1-3. I find that highly unlikely. Anyone have proof that is true?
06-07-2013, 08:03 AM
#2
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People think that for some reason you're putting exponentially more wear on the syncros, which isn't true if you rev match properly. Maybe slightly more, but not on the order of magnitude they are all convinced.
06-07-2013, 08:24 AM
#3
06-07-2013, 11:08 AM
#6
06-07-2013, 11:36 AM
#7
Moving the shifter through the gears engages the syncros and slows down the input shaft. Lets say you're at 7,000 rpm in 1st gear and want to shift.
If you're skipping 2nd and going straight for 3rd, that 3rd gear syncro has to slow down the shaft from 7,000 rpm to 3,250 rpm in a short amount of time.
If you move the shifter through the gear, the 2nd gear syncro is going to do some work to slow down the shaft from 7,000 to 4,500 first, then the 3rd gear syncro only has to slow it down from 4,500 to 3,250.
So: not moving through the gears = 3rd gear syncro has to deal with a speed delta of 3,750 rpm.
Moving through the gears: 3rd gear syncro has to deal with a speed delta of 1,250 rpm.
What is going to be easier on the syncro?
If you're skipping 2nd and going straight for 3rd, that 3rd gear syncro has to slow down the shaft from 7,000 rpm to 3,250 rpm in a short amount of time.
If you move the shifter through the gear, the 2nd gear syncro is going to do some work to slow down the shaft from 7,000 to 4,500 first, then the 3rd gear syncro only has to slow it down from 4,500 to 3,250.
So: not moving through the gears = 3rd gear syncro has to deal with a speed delta of 3,750 rpm.
Moving through the gears: 3rd gear syncro has to deal with a speed delta of 1,250 rpm.
What is going to be easier on the syncro?
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06-07-2013, 11:57 AM
#8
Moving the shifter through the gears engages the syncros and slows down the input shaft. Lets say you're at 7,000 rpm in 1st gear and want to shift.
If you're skipping 2nd and going straight for 3rd, that 3rd gear syncro has to slow down the shaft from 7,000 rpm to 3,250 rpm in a short amount of time.
If you move the shifter through the gear, the 2nd gear syncro is going to do some work to slow down the shaft from 7,000 to 4,500 first, then the 3rd gear syncro only has to slow it down from 4,500 to 3,250.
So: not moving through the gears = 3rd gear syncro has to deal with a speed delta of 3,750 rpm.
Moving through the gears: 3rd gear syncro has to deal with a speed delta of 1,250 rpm.
What is going to be easier on the syncro?
If you're skipping 2nd and going straight for 3rd, that 3rd gear syncro has to slow down the shaft from 7,000 rpm to 3,250 rpm in a short amount of time.
If you move the shifter through the gear, the 2nd gear syncro is going to do some work to slow down the shaft from 7,000 to 4,500 first, then the 3rd gear syncro only has to slow it down from 4,500 to 3,250.
So: not moving through the gears = 3rd gear syncro has to deal with a speed delta of 3,750 rpm.
Moving through the gears: 3rd gear syncro has to deal with a speed delta of 1,250 rpm.
What is going to be easier on the syncro?
06-07-2013, 12:01 PM
#9
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I never even move the shifter out of neutral into a gear unless the car is rpm matched to my estimates anyways. People really should go out and play around with shift points and take close note to learn the limits of every gear and then figure out the appropriate rpm differences between them for a given speed. It will make them much better drivers.
