I want to know what happen if i do not rev-match correclty while downshifting
07-30-2004, 07:58 PM
#27
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Wokuku my 2c worth:
You need not stare at the rpm gauge and calculate based on gear. The easier approach is to blip (i.e. rev up) and then shift into gear.
Aim for slightly higher than rpm you desire.
Check point: When you are shifting if you are off by a lot the gear will not shift smoothly. So stop there and then retry you blip or abort.
Once you shifted in release the clutch smoothly but quickly (taking a few seconds is not a good idea as the engine is slowing down from its blipped rpm).
My re-enaction of the event:
a) With clutch in front wheels are moving at 35 mph rear wheels at 35mph
b) When clutch is released the rear wheel speed depends on engine rpm and gear you are in. Assuming you are off in rev matching this be like rear wheel speed is slower for fleeting moments. Note the car is rigid and front wheels cannot fly off on their own. So faster moving front wheels and slower moving rear wheels will balance out very quickly. If speed difference is large could seem very jerky or like weight being thrown around.
My hypothesis is that this sudden speed difference and corresponding weight shift and slowing is what you are describing.
It is your car and all that, but my advice is to keep trying.
You have experienced the stick, the carrot is access to instant acceleration. The carrot is real sweet.
In summary: Blip higher, release quicker.
You need not stare at the rpm gauge and calculate based on gear. The easier approach is to blip (i.e. rev up) and then shift into gear.
Aim for slightly higher than rpm you desire.
Check point: When you are shifting if you are off by a lot the gear will not shift smoothly. So stop there and then retry you blip or abort.
Once you shifted in release the clutch smoothly but quickly (taking a few seconds is not a good idea as the engine is slowing down from its blipped rpm).
My re-enaction of the event:
a) With clutch in front wheels are moving at 35 mph rear wheels at 35mph
b) When clutch is released the rear wheel speed depends on engine rpm and gear you are in. Assuming you are off in rev matching this be like rear wheel speed is slower for fleeting moments. Note the car is rigid and front wheels cannot fly off on their own. So faster moving front wheels and slower moving rear wheels will balance out very quickly. If speed difference is large could seem very jerky or like weight being thrown around.
My hypothesis is that this sudden speed difference and corresponding weight shift and slowing is what you are describing.
It is your car and all that, but my advice is to keep trying.
You have experienced the stick, the carrot is access to instant acceleration. The carrot is real sweet.
In summary: Blip higher, release quicker.
07-31-2004, 12:32 PM
#28
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j/w is it ok to just hold your clutch in the whole time? cuz when i downshift i...
1) shift into neutral holding down the clutch
2) still while holding the clutch down i rev it up
3) then shift into the lower gear and let go of the clutch smoothly
is this approach ok? i mean thats the way ive always been rev matching...
1) shift into neutral holding down the clutch
2) still while holding the clutch down i rev it up
3) then shift into the lower gear and let go of the clutch smoothly
is this approach ok? i mean thats the way ive always been rev matching...
08-02-2004, 04:34 PM
#29
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Mikelikes2drive what you describe is rev matching. You can even do it after shifting to lower gear and not in neutral.
This is however not double clutching. Rev matching is great for down shift of say a gear (6 to 5). For aggressive shifts, down shift many gears (say 6 to 3), double clutching is way to go.
Note that if you want to decrease speed by end of shift you heel and toe.
a) Single gear down shift : Rev matching
b) Multi gear down shift : Double clutching
c) Gear shift while slowing : Heel and toe (you can use either rev match or double clutch along with braking depending on situation)
There are numerous good sites out there, one of them is:
http://www.waycoolinc.com/z3/essenti...e/shifting.htm
This is however not double clutching. Rev matching is great for down shift of say a gear (6 to 5). For aggressive shifts, down shift many gears (say 6 to 3), double clutching is way to go.
Note that if you want to decrease speed by end of shift you heel and toe.
a) Single gear down shift : Rev matching
b) Multi gear down shift : Double clutching
c) Gear shift while slowing : Heel and toe (you can use either rev match or double clutch along with braking depending on situation)
There are numerous good sites out there, one of them is:
http://www.waycoolinc.com/z3/essenti...e/shifting.htm
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