sig_a

I learned how to heel/toe on the street years before applying it on a race track.

That Cervelli video is a great how-to reference. Almost graceful.

mark kibort

the problem is wear on the gear box.
the problem is also not getting the max amount of compression braking forces at the rear tires, and rear antilock characteristics with greater stability. Its probably a shaving hairs advantage if you have a close ration gear box.

Tom W

At Sears Point, I go from the top of 4th (~116 mph) down to 2nd for T11. I 'row' through 3rd to get there because I like to do it that way and I believe I have less chance of a missed shift or a poorly timed shift that would allow my competition to get past me due to a small mistake in one of the best places to pass.

I also usually compromise T2 with only going 4th to 3rd as it's too much for me to be going to 2nd and trying to keep the car settled while braking and turning. I'd likely get a better jump out of 2 by being in second but a mistake would be costly so I play it a bit more safe to ensure I keep the car settled and keep a good line through the turn.

333pg333

I don't see the extra load on the syncros etc if it's done properly. As mentioned, under the correct set of circumstances when you've slowed enough to realistically skip a gear I don't see the problem. Even if you 'over' blip for a safety margin vs over revving with clutch disengaged.

jrgordonsenior

2:55 is screaming for those who haven't had the pleasure of driving Miller. He makes it looks so damn easy. At least in the TWS video he corrected once....

Veloce Raptor

Yup, anything under 3:00 is fast. Chris is a very graceful driver.

mglobe

Decreasing the chances for a money shift by rowing through the gears is why I do it. I brake, keep the clutch in, and row through each gear. It just works best for me.

mark kibort

The extra wear is that you have a larger gap in transmission vs wheel speed, by jumping or skipping gears, unless you double clutch as you pass through neutral. Chis isnt double clutching, he is bliping and shifting as normal. again, for him, its not an issue because his gears are so close together. but, none the less, the synchros do wear more if the forces are greater, and they certainly are when you shift by skipping a gear. doing it "properly" has nothing to do with the wear. the transmission is spinning in 5th gear for example, you push the clutch in, (engine revs dont matter), and then you select 3rd. drive shaft, clutch discs and transmission layshafts are all running 5th gear vs wheel speed rpm. now, as you select 3rd, the drive shaft has to spin up 25% or 50% higher, in an instant. depending on the mass of all the components, the syncrhos take this load and force to spin up and match the road wheel speed at a shorter gear ratio. nothing to do with engine rev matching. the only thing you can do to avoild this is how you shift. not using as much clutch helps, or double clutching as you pass through neutral, and blip, will do it too. (but this takes a lot of time and is not really the best way to get around the track)

Mark

Carrera GT

That is textbook driving! Actually, it's the "rules" in the textbook that he's breaking (they're more "guidelines" anyway) that really illustrate the differences between good driving in a bespoke race car and amateur driving in the street car "equivalent" of the race car.


Now, more importantly, how much does a 993 RSR cost and where can I get one?!

333pg333

I take your point Mark. Mine is that by the time I'm pushing the shifter into 3rd I've already dropped a lot of speed off by pretty hard initial brake cadence. I'm also not going from flat out in 5th. In the instance that I'm describing I've only just snicked it into 5th for about 2-3 seconds. So by braking pretty hard, clutch in, (speed dropping considerably), blip, into 3rd, release clutch (not drop), I'm probably doing a similar engine to trans shift as if I was in 4th.

Anyway as we can see, it does work in some cases. What I don't get is people rowing down through the gears, blipping each time, yet keeping the clutch in all the way? This technique has me puzzled.

mark kibort

So, to my point, clutch in, rowing through the gears, still does a lot, because you spin up the layshaft, drive shaft and clutch plates , independant of the engine. the blipping then serves no purpose though, you are right, but the rowing does step the RPM of the drive line faser and faster and faster. skip a gear and that gear synchro takes more force to spin up the rotating compoents.
I still feel that if done quickly, as the shift is completed with a blip, that the engine helps with the spin up, but not positive about that.

maybe there is some minimal dragging of the clutch, in that there is enough force to spin up the drive shaft, but still enough disconnect to select in and out of gears.

I think the proof is in the video. if things look and feel smooth, you probably arent hurting anything.

jrgordonsenior

That car is now in So Cal and unfortunately I race against it all the time. The owner also owns another historic 993 RSR whcih you'll see at Rennsport, and a beautiful 993 Cup....