Rev Matching
11-01-2011, 05:40 PM
#8
I'm guessing 370z has a sensor in the transmission to tell the ECU what gear it's in. Megasquirt can only figure out the transmission gear via combination of vehicle speed sensor, RPM and user-specified gear ratios.
Because of that, even if you could electronically blip the throttle, MS can't be programmed to determine whether you're downshifting, upshifting or just pushing in the clutch until after you release the clutch in and engine RPM rises/drops/remains same.
Because of that, even if you could electronically blip the throttle, MS can't be programmed to determine whether you're downshifting, upshifting or just pushing in the clutch until after you release the clutch in and engine RPM rises/drops/remains same.
Reply
0
0
11-01-2011, 06:08 PM
#12
It'd be a lot less trouble to weasel out all the engineering challenges of teaching a brutally simple engine management system to know what gear it's in, what gear it's going into, what the vehicle speed is, what the corresponding rpm should be, how much throttle it needs to use to get there and stay there, and how to give it that much throttle, precisely and repeatably.
NM.
NM.
Reply
0
0
11-01-2011, 07:17 PM
#14
^haha sooner than we think. We already got cars with massage crap in the seats, ones that automatically slow down when a car ahead of slows down, and a few that check blind spots for you!
But yea, heel-toe is not as difficult as it sounds really. Just make a pedal extension and bolt it into the stock pedal, voila! easy* heel-toeing while trying threshold braking.
*With practice of course.
But yea, heel-toe is not as difficult as it sounds really. Just make a pedal extension and bolt it into the stock pedal, voila! easy* heel-toeing while trying threshold braking.
*With practice of course.
Reply
0
0
11-02-2011, 08:11 AM
#15
One way to figure out if downshifting or upshifting could be to analyze the delta-v during the last second.
If you are downshifting you usually have slowed down the last second, and if you are shifting up you usually have accelerated during the last second.
This could then be tagged into the flat-shift function (which doesn't care about vehicle speed as it is now I guess).
If you are downshifting you usually have slowed down the last second, and if you are shifting up you usually have accelerated during the last second.
This could then be tagged into the flat-shift function (which doesn't care about vehicle speed as it is now I guess).
Reply
0
0
11-02-2011, 03:14 PM
#16
Moderator
iTrader: (12)
Join Date: Nov 2008
Location: Tampa, Florida
Posts: 20,645
Total Cats: 3,009
Here's the device:
It is a pedal extender to allow easier heel-toe braking.
http://www.rennenmetal.com/proddetail.asp?prod=2280
It is a pedal extender to allow easier heel-toe braking.
http://www.rennenmetal.com/proddetail.asp?prod=2280
Reply
0
0
11-02-2011, 04:17 PM
#18
Boost Pope
iTrader: (8)
Join Date: Sep 2005
Location: Chicago. (The less-murder part.)
Posts: 33,019
Total Cats: 6,587
It may have something to do with shoe size (I wear size 14 Timberlands) but I find it amazingly simple, no need for any kind of pedal extension.
The thing I find misleading about the term is that I don't really use the heel and toe to do it. I just step on the brakes with the ball of my foot, and roll my foot at the angle. I can easily hit the throttle with the side of my shoe, and honestly, it's a very natural movement. No contortion or having to think about where my feet are, just side-step the brake and feel for the throttle.
The thing I find misleading about the term is that I don't really use the heel and toe to do it. I just step on the brakes with the ball of my foot, and roll my foot at the angle. I can easily hit the throttle with the side of my shoe, and honestly, it's a very natural movement. No contortion or having to think about where my feet are, just side-step the brake and feel for the throttle.
Last edited by Joe Perez; 11-02-2011 at 05:13 PM. Reason: mis-used an apostrophe.
Reply
0
0
11-02-2011, 05:00 PM
#19
^its exactly how you do it. Heel-toe is a misnomer.
And shoe/foot size is a big factor. I tried to heel toe without an extension because every one told me it was so easy and comfortable to do it in the miata. Well, as an average sized male with a 9.5-10 shoe size, I practically drove off the track trying to heel-toe on the backstraight of RA. missing your braking at 110mph is pretty ****** scary. If you got average-small feet, go ahead and extend the pedal, but if you are big one, you might just be fine.
Heel-toe on the street is pretty silly, but I was able to do that fine. your foot lines up much more easily on the throttle pedal, because you aren't 2in deep on the brakes.
And shoe/foot size is a big factor. I tried to heel toe without an extension because every one told me it was so easy and comfortable to do it in the miata. Well, as an average sized male with a 9.5-10 shoe size, I practically drove off the track trying to heel-toe on the backstraight of RA. missing your braking at 110mph is pretty ****** scary. If you got average-small feet, go ahead and extend the pedal, but if you are big one, you might just be fine.
Heel-toe on the street is pretty silly, but I was able to do that fine. your foot lines up much more easily on the throttle pedal, because you aren't 2in deep on the brakes.
Reply
0
0
11-02-2011, 05:15 PM
#20
Heel and toeing (or rev matching) is not silly anywhere. It is a skill, and like any skill the more you do it the better you get. You also get the benefit of keeping a neutral attitude on your car which helps your handling. This is also why I always do it when riding a motorcycle.
Reply
0
0
