Brake boosting
 

Hi guys, I picked my 94' rx7 up two weeks ago and have read about brake boosting on this forum before. I never asked about it because I have never owned a turbo...Can someone explain to me how you brake boost? and what effect it is supposed to have?

"I've heard a lot about people brake boosting on the roll, so decided to practice it today, but it doesn't really feel much faster. When you're brake boosting, you're prespooled, but as soon as you let go of the brake, it just feels like the car keeps going, without that funny feeling in the gut, acceleration feeling. When you don't brake boost, you can really feel the car pickup and go as the turbos kick in.

So I'm wondering, how much of a difference this technique makes."

This is all I have found so far

-Andrew

I believe its where you excel. while braking and you brake so you can maintain speed and build boost while you are excelerating and maintaining the same speed.

Don't do it. It's hard on every part of the car and doesn't give you any advantages. Heel-toe is another story.

So can brake boosting get 0-100km/h faster or it just gives you a bigger kick in the back because you slow down a bit?

What is heel'n toe?

i don't think it helps in 0-100 but from a roll wen u are racing someone, it probably helps u keep your speed with the other car and gives u instant boost instead of waiting for boost

Yea its quite amazing when done right but you usually have to smash the brake down, but when you let go of that brake, whew!! get ready for a ride.

If you still have the stock twins, I fail to see how brake boosting is going to accomplish much of anything. Usually, this technique is used by cars with slower spooling turbos, where it can actually make a difference. The FD stock twin turbos spool so fast, especially from a "racing" rpm that brake boosting isn't going to help.

wile breaking you use your toes to break and at same time use your heel to push down on the gas to make the rpms go up so that you can downshift at higher speeds. By doing this you keep your engines momentom behind it instead of breaking and winding it down as you go around a corner, Also it lets you down shift higher rpm with out risk of damage to your syncros since before there invention the only way to down shift was to rev match(heel to toe), When doing this its best to have the car in neutral wile doing this since it will rev easyer. It take some practice but once you get it you may find your self doing it all the time ;)

I disagree. I do toe toe without any aftermarket pedals and size 7 feet. I find it easier to do it this way than twisting my leg to the side. I'd like to add some pedals to make it easier. Haven't gotten around to it yet. Just my preference. Not trying to bust your balls, Sean.

Most modern cars aren't really set up for the traditional heel-toe and it is usually easier to use the side of your foot. Either the traditional or sidestep technique is easier with one of the Widefoot pedals, either from Sleddriver or David Breslau.

Not to mention that boosting against the converter with the brakes depressed will destroy your converter sooner or later. Stock converters aren't made to take that kind of abuse.

what about people with non seq?

People with automatic transmissions should never be "people with non seq". If you have a manual transmission, it's a moot point because not only can't you brake boost effectively, but you don't need to.

Either way, a downshift is going to result in more rapid acceleration that trying to brake boost.

THanks
Heel and toe is amazing, i cant believe I can slot the gear so easily in when I raise the revs with the heel.

What are the other little tricks you people have??!

That's mostly it. I do heel-toe a little on the streets, but mostly it's useful on the track.

Another tip is to use the shifter with precision, rather than jamming it from gear to gear. That little bit of control in your shifting can help prevent blowing a gear or synchros. Double-clutching is also unnecessary, assuming you have enough skill to rev-match and you don't slam the shifter.

Before you ask, clutchless shifting is also a bad idea, and not faster.

Dave

its can be hard in some cars

haha no worries i understand, its easyer for me to do it since i got size 13 feet ;) cant help but do it.