BrenBmwNut said:The reason for blipping over the correct rpm is that it takes a little bit of time to get the clutch out once you have blipped. Gregs advice is spot on as always, as it is best to learn how to downshift to a given gear and rpm before experimenting. After sometime you will develop the feel for how much to blip for a given shift, and the numbers wont matter. Until that time, blip for the numbers that you remember.
When I blip the rpms go over where I need them to be, and then I pull the clutch out while the rpms are falling to the correct rpm. Do what works best for you, as I know some people who like to catch them on the way up, but I prefer catching them on the downswing.
If you shift, get it in the lower gear and then blip, I recomend sitting in the driveway with the car off to practice the motion. What works best is clutch in, then blip and shift at the same time. By sitting the driveway with the car off you can get used to the motion better, and at some point it will be second nature. You dont have to do this, but it saves time and is IMO easier.
There are quite a few great threads on this, so doing a search might help answer some questions. Hope this helps!
Yes makes sense. I have done double clutches ( butter smooth as you say) and singles (almost as smooth with practice). I understand with clutch in the you have disengaged, but any time I have resistance on the stick a quick blip always lets it slip right into the lower gear. Maybe I am subconsciously doing a quick double clutch, I will have to pay more attention next time.BmwNut said:As a small point of clarification Jerry unless you double clutch you dont spin the input shaft of the tranny, so the internals dont get rev matched. Once the clutch goes in, it really doesnt matter when you blip as the engine and tranny are not connected anymore. Almost all of my downshifts are double clutches, and by blipping with the clutch out in neutral the input shaft turns the internals of the tranny to the correct rpm, and gears slot in buttery smooth like you mentioned. Hope that makes some sense.
You are correct, I think I admitted to occassionally doing just that!! I was taught downshifting for track driving, so the "always use the brake" was part of the general rule. For passing power, drop down 2 (no brake needed) and call me in the morning!! :flag:MEnthusiast said:Also, Jerry, I think I understand your comment about always using the brake too, but what if you are just looking for passing power- you don't need the brakes for that- just rev match and go!
These are exactly my observations. I can´t imagine that it stresses the clutch overly if only a very small amount of throttle in the lower rpms is applied an thus the engine does not deliver much power to harm the clutch. And you do your drive train a big favour because gear changes really go smooth and without any jerking motion. It took me quite some time to shift this car properly, but with a lot of practice and some good advice of the board (thanks greg!!) things are going well now.HDClown said:Is it bad for the clutch/transmission to blip the throttle on a downshift but still leave your foot very slightly on the gas as you let the clutch re-engage? I've found this an easier way to get the clutch engaged smoothly. This is primarily in low RPM downshifting however. In the higher RPM range, doing a true blip with no foot on the gas until after the clutch engages is easier.