brake boosting?

4463 Views 17 Replies 12 Participants Last post by btm7687, Dec 12, 2003

btm7687

Discussion Starter · Dec 11, 2003

just to let u know i searched for about 30 min straight and i found nothing about how to brake boost and what it is.....i was just wondering cuz i read it in a thread a little while ago.

1 - 18 of 18 Posts

JuPa

· #2 · Dec 11, 2003

Brake boosting is when you hold the brake but get on the throttle at the same time when at a stop. This is used for auto's without highstalls in order to get somewhat of a better jump than just getting on the gas. Brake boosting allows the revs to start rising without the car actually moving. This causes the turbos to be somewhat prespooled before the car takes off, also at a higher rpm the car will have more torque to get off the line. Howeve ryou can only brake boost so far before the brakes can't hold anymore and you start spinning the rears.

Most usually hold down the brake hard, and rev to about 2700, anymore than that any my tires start spinning. But right before you let go of the brakes get on the throttle hard, to get just a bit more before you take off.

hope this helps

Rick

SupraSpeedMKIV

· #3 · Dec 11, 2003

you can also brake boost from a roll in 6 speed and autos. get to the speed you want to start at, hold the brake just enough to keep the car from speeding up, and step on the gas pedal.. so the pedal is floored or close to it and the brakes are being held so the car isnt accelerating, its just putting load on the engine/prespooling the turbos. Ive never raced someone with me brake boosting then with me not brake boosting so I dont know how big of a difference it makes, and I dont brake boost for every race.. just depends on if i think to or not. the car seems to take off harder when brake boosting though.

G

· #4 · Dec 11, 2003

I can hear your brakes scream!!!!!!!!!!!!! and your transmisson cry!!!!!!!!!!!!!!!!!!

SupraSpeedMKIV

· #5 · Dec 11, 2003

crucible said:
I can hear your brakes scream!!!!!!!!!!!!! and your transmisson cry!!!!!!!!!!!!!!!!!!

..ok..

it really doesnt put any wear on anything other than brake pads/rotors. And even then its not that much, an insignificant amount. Its not like its being done for an extended period of time. Matter of seconds.

Josh M

· #6 · Dec 11, 2003

crucible said:
I can hear your brakes scream!!!!!!!!!!!!! and your transmisson cry!!!!!!!!!!!!!!!!!!

Yeah he should take advice on brake boosting from someone with a Celica

brake boosting does fine, I probably wouldn't suggest it from every stop light, but once in awhile won't hurt much and at the strip I'd recommend trying to rev her a little higher so she has a little more right out of the gates

however I wouldn't suggest doing for extended periods of time either, that will really heat up your tranny and then it will be crying......but then you take it to boost logic and they make it all better

neonafk

· #7 · Dec 11, 2003

Don't break boost for too long, imagine trying to hold 400 rwhp still.. thats pretty damn hard on your breaks.

-Brett

Catch28

· #8 · Dec 11, 2003

xsentrixsupra said:
however I wouldn't suggest doing for extended periods

Yea just ask Powerhouse

ScrewDrvr

· #9 · Dec 11, 2003

brake boosting is a HUGE advantage froma stop or a roll. Hell, i can beet 600cc bikes from a roll if i brake boost at about 60mph in 2nd gear (auto), when i let off the gas both turbos are INSTANT..i.e. NO LAG PERIOD. If i dont brake boost, the bike will jump me and i wont have enough time to catch back up.

Same thing at the track, my times will be like +.3 or slower if i dont brake boost out the whole. Hell, I build 10psi with the e-brake on a hard launch, thats about 3krpms, so befor the 60ft mark the 2nd turbo has spooled and im off already.

Mr TT

· #10 · Dec 11, 2003

When Im racing I like to hold down the foot brake and the e brake to get the boost up and then just let go.The e brake helps you build way more boost then just the foot brake alone.

Pete

1997SilverTT

· #11 · Dec 11, 2003

Use a 75 shot and you won't need to brake boost.

John

bad94sup

· #12 · Dec 11, 2003

1997SilverTT said:
Use a 75 shot and you won't need to brake boost.

John

John:

How does nitrous work out on the street? Does it really boost instantly from a stop without stalling it up? Are you able to maintain traction? Im thinking about running a kit shortly and am wondering what size/type of a system I am going to use.

Andrew

HomeRocks

· #13 · Dec 12, 2003

I always break boost when racing from a roll. It kind of became second nature after a little while. I drive a 6-speed and I only do it from a roll, but it will make a very big difference. I tested it against a friend in his modded S4. The S4 has good bottom end torque because of the small turbos. If I didn't break boost he would get about a half car jump or more on me immediately. When I brake boosted I would get a good jump everytime. It seems that it can make about a good 1 car difference off the jump.
Tony

1997SilverTT

· #14 · Dec 12, 2003

bad94sup said:
John:

How does nitrous work out on the street? Does it really boost instantly from a stop without stalling it up? Are you able to maintain traction? Im thinking about running a kit shortly and am wondering what size/type of a system I am going to use.

Andrew

Andrew,

Whats up bud? With the 75 shot it spools the turbo instantly. Actually it doesn't increase spool time but allows the car to reach the spool rpm instantly. I am not sure with the 6 speeds but with auto's and higher stalls it's great. You have the AEM so you can shut it off when you reach desired boost to keep traction and can run a safer dry kit. I have not hooked up the NO2 with the AEM yet (I'll leave that up to Sean). I had the NO2 hooked to my horn as a switch (biggest button I could find) I would let off just when boost was climbing. Traction was a little better cause the car was moving faster when the turbo boosted. You should get the kit you'll like it. You will need a bottle heater to maintain constant bottle pressure. Cold bottle will push 400 - 600 psi but when heated will do 900 - 1000 psi.

Nick 95 6sp

· #15 · Dec 12, 2003

Since I'm a little bored right now and don't use nitrous in my car yet let me try to cause trouble.

Unless terminology has changed in recent years and I'm unaware of it ...very well could be ...IMO some of us are mixing up brake boosting and power braking. Most of the answers here are right but I'm just referring to the correct terminology. Power braking applies only to auto trannies from a standing start ...yeah yeah I don't even have an auto Supra but I've had other auto tranny cars; hold the brake push the gas pedal but not enough to move, release the brake and off you go. And we know the turbo will build boost at the line cause you're able to load the engine against the TQ without moving. Not as easy with a manual trans ...unless you're using a two step or the launch control option like on my Racelogic which also builds boost at the line. But brake boosting is when you load up the engine against the brakes while moving which then also builds boost so when you release brakes off you go.

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1997SilverTT

· #16 · Dec 12, 2003

Nick 95 6sp said:
Since I'm a little bored right now and don't use nitrous in my car yet let me try to cause trouble.

Unless terminology has changed in recent years and I'm unaware of it ...very well could be ...IMO some of us are mixing up brake boosting and power braking. Most of the answers here are right but I'm just referring to the correct terminology. Power braking applies only to auto trannies from a standing start ...yeah yeah I don't even have an auto Supra but I've had other auto tranny cars; hold the brake push the gas pedal but not enough to move, release the brake and off you go. And we know the turbo will build boost at the line cause you're able to load the engine against the TQ without moving. Not as easy with a manual trans ...unless you're using a two step or the launch control option like on my Racelogic which also builds boost at the line. But brake boosting is when you load up the engine against the brakes while moving which then also builds boost so when you release brakes off you go.

Good point Nick!

John

Nick 95 6sp

· #17 · Dec 12, 2003

Thanks, John. We both know in Pennsylvania it works that way. Other places? ...who the hell knows!

btm7687

Discussion Starter · #18 · Dec 12, 2003

1997SilverTT said:
Andrew,

Whats up bud? With the 75 shot it spools the turbo instantly. Actually it doesn't increase spool time but allows the car to reach the spool rpm instantly. I am not sure with the 6 speeds but with auto's and higher stalls it's great. You have the AEM so you can shut it off when you reach desired boost to keep traction and can run a safer dry kit. I have not hooked up the NO2 with the AEM yet (I'll leave that up to Sean). I had the NO2 hooked to my horn as a switch (biggest button I could find) I would let off just when boost was climbing. Traction was a little better cause the car was moving faster when the turbo boosted. You should get the kit you'll like it. You will need a bottle heater to maintain constant bottle pressure. Cold bottle will push 400 - 600 psi but when heated will do 900 - 1000 psi.

the formula for nitrous oxide is actually N2O, not NO2

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