MrElussive said:
Thanks for the advice.
In the video, it looked like these guys were heel-and-toe downshifting simply for optimum braking power before entering the turn and because they would be a lower gear so they had maximum engine power when powering through it.
Getting into a lower gear is a separate issue from the heel and toe downshift versus a downshift that uses the synchros to match the rpms. Of course, if you are entering a corner at speed, you will be downshifting to the gear that puts you in the engine's powerband for when you apply the throttle again.
Think about it: Engine braking is stronger when you don't match the rpms in the lower gear. If you blip the throttle and match the revs, you don't get as much engine braking from the downshift, and most importantly you don't get the mad jerk of power that will send you into a spin. The point of matching the revs is to avoid the negatives of engine braking and save wear and tear on the clutch and/or synchros (if you even have them).
The only way to learn it is to do it. I've been trying to do it most of the time for the last year and I think it has finally clicked (more on that later).
Here's a good explanation of something we all know but may fail to consider when thinking about what heel and toe is about. (from a fellow nsxer)
"When your car is traveling at a certain speed, there is a specific engine speed that matches that road speed in any given gear, when the clutch is out. Matching revs during shifts means that while the clutch is pressed in, you adjust the accelerator position so that the engine is turning that exact engine speed, before you let out the clutch.
For example, let's say you have a stock '91 NSX, and you're going 40 miles per hour. Depending on which gear you're in, here is how many RPM the engine is turning:
1st - 6853
2nd - 3854
3rd - 2745
4th - 2158
5th - 1720
Matching the revs means that you try to make the engine turn at the proper number of revs when you're shifting, before you let out the clutch. For example, let's say you accelerate from 0 to 40 mph in first gear, and then you shift. Before the shift, your engine was turning at 6853 RPM. While the clutch is pressed in, you let off the gas enough for the revs to drop to 3854 RPM, hold it there if you need to (not necessary when you get good at this), and then let out the clutch. This means that there will be no change in revs when you let out the clutch - because there is no difference in speed, and no work for the synchros.
This results in the least amount of wear on the clutch."
**
Well, it works both ways. When you are braking from 150 to 40, and you starting going down from 5th to 4th, you need to match revs to the rpm that corresponds to 110 in 4th or 75 in 3rd, etc., until you turn, get on the gas, and make your track out. The good drivers time it all perfectly. I can't do it consistently at 9/10ths or above.