RPM jump when upshifting

Spikuh · 03-25-2012, 02:44 PM

Quote:

Originally Posted by roy'sz

srm doesn't match up shifting, i don't know why people are thinking that it does. If you aren't getting a shudder from the motor ( sounds like a f1 car going through the gears) then you are doing a good job also.

Incorrect. Simply get in the car, turn on SRM, start driving and rev to 4k, shift from 1 to 2 and don't release the clutch. You will notice the RPM's do NOT drop back to idle. They hold considerably higher somewhere near 3k.

That is rev matching.

Now do the same thing except with SRM off. Notice how the RPM's drop back to idle.

That is NOT rev matching.

Quote:

Originally Posted by Drex

it doesn't match on upshifts but it does hold the revs from dropping too low if you're slow to shift

Also called rev matching....

Rev matching has nothing to do with downshifting or upshifting, but is simply about matching the engine rotation with the rest of the drivetrain. It just does not happen as much on the upshift because if done properly, you can basically "catch" the engine as it slows down. Done properly will allow for a smooth shift, done less than properly will provide a rougher shift.

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