I'm in the office right now, so cannot go out to the car to test this, but I just read on this page that the drive-by-wire throttle input is disabled any time brake is applied? Does anyone know if this is definitely true or definitely not true? That would technically make heel & toe impossible. I'll try it this evening when I get home for myself--the pedal arrangement doesn't work well enough with my foot that I've ever been able to actually try heel & toe yet while driving (have only had the car since late May), but I can just try with the car at a stand still and in neutral to try applying gas while my left foot holds the car still with the brake (I'll leave the hand brake disengaged).

-Ed

 

you can still heel toe it. its actually more of a ball of your foot on the brake pedal and the outside edge of your foot "blipping" the gas pedal. it will work. drive by wire has been out awhile and that isn't exactly what keeps you from power braking.

 

No no, if you read that article, they're indicating that on this car (2007 350Z), the system cuts throttle input when it senses brakes are applied (via the brake lamp sensor). I'm not citing throttle-by-wire in general (I've driven plenty of cars that are throttle-by-wire; my tC that I traded in for this car was throttle-by-wire and I used heel and toe daily on it). I'm specifically talking about the '07 350Z with VQ35HR.

BTW that's how I used to heel and toe my tC; left edge of the foot on the brake, right edge of the foot on the throttle. I had a set of Ultimate Pedals installed, which also made it easier.

-Ed

 

The issue isn't that when you hit the brake you can't rev...rather, when you hit the brakes and try to put torque down it cuts power. That is why you cannot hold the brake in a burnout or brake boost a turbo car, unless you pull a fuse (can't remember if it is the ABS fuse or the brake light fuse though). Heel-toe works fine though.

At least thats the way it is on the earlier 350Z's...I would figure 07 would be the same. Nissan wouldn't make a car that was un-heel-toe-able.

 

+1

 

You can still do it. I did it on my 07 NISMO this past weekend on a cruise.

 

My general logic would leave me to believe that Nissan would never make a car like this un-heel and toeable, but stranger things have happened. How does it, "know," the difference, whether the clutch is engaged or not?

-Ed

 

Heel and toe works just fine on my 07.

 

I can heel toe in my 07. Still not very good at it, but it works none the less

 

Correct...you can heel toe to downshift, but you cannot apply gas and brake at the same time when the trans is engaged

 

Thanks for clarifying!

-Ed

 

I take it none of you did any reading on the KPT module for this? When you hit the brakes, this module allows that signal to hit the ECU for about a second, and then it cuts off that signal. The ECU thinks you let off the brake, but in reality you're still holding it down.

The reason it's not just completely disabled (the signal), is because that signal is needed to keep a light from throwin. If the ECU doesn't see that signal for xx # of miles (xx meaning double digit), it will eventually have a code about the brake signal malfunctioning.

The momentary pulse allows the ECU to understand everything's still functioning fine, but also stops the ECU from pulling power due to sensing brakes being applied.

 

https://my350z.com/forum/forced-induction/231581-brake-boosting-a-tt-350z.html

 

Heel and toe works on all of them. You can free rev with the brake applied, but as mentioned, the throttle is cut while in gear, and load is being applied to the engine...not just a free rev that would occur during heal/toe action.

Electronically locked out heal/toe would be quite rediculous on any MT....and I hope it never comes to that.