Honestly I think it does more damage to your car than anything.

You don't really need it on a new car.

Use the clutch twice as much etc.

However some people think they are good/race drivers if they use it :victory:

(On the street)

everytime you pull the pressure plate away from the clutch plate and then it re-engage it wear microns of clutch plate material away...just like brake pads. when i had a manual car the only time i change down was to overtake or stop very quickly. other wise i just coasted then went to neutral to stop.
double clutch dont you only change like that in truck

if you know how and can match the r.p.m you should be able to change gears without a clutch

Winkles wrote:

I rev match on the down change after I’ve put the transmission into gear. I.e. push down the clutch, take gear out of 5th put into 4th gear then rev to the apparent rev it should be doing at that speed then release clutch not sure if this is good or bad but certainly makes it seam like your putting less pressure on the clutch plate to get the engine up to speed

double clutching is fairly pointless if not for a reason.

it can extend the life of your clutch plate
it will lessen the life of your clutch assembly and hydraulics
it will lessen the wear on the syncros
it will use more fuel
it will wear out the engine more

so unless the gearbox is a bit dodge or your playing real life Daytona, then its probably serving very little purpose at all.

or your all cool and have a dog engagement gearbox

hawks123 wrote:

I rev match changing down. How badly or quickly does it do damage to the thrust bearing. It's usually only 5-4 4-3 gears. So it's only about 1000rpm difference or a short blip of the throttle.