How To Brake Boost A Manual Car

I was talking to my friend today - he has an automatic rsx-southward from 2003 or so.

He says he keeps using restriction boosting to spool the turbo on the automatic and that in no way a car with manual transmission of comparable charaterisitics tin trounce it off the line.

I kept telling him that you lot can however spool turbo without using the brakes with a transmission simply past using gas and keeping the clutch depressed in 1st @high rpm - just similar a regular hard launch.

Is this brake boost simply useful on automated trans? I've too heard launches with a e-brake on a manual. I guess e-brake is just useful on a slight incline to concur the car in place?

I've also read that you can kill your tranny pretty fast by doing this.

Whatever ideas?

Thank you)

Post by **VTECaddict** » Midweek Mar 19, 2008 9:14 pm

the turbo still spools when the engine is free-revving (eg in neutral or with clutch depressed). a manual tin rev college than an automatic thats "brake boosting" considering the automated is limited by the stall speed of the torque converter.

"brake boosting" (brake torquing is the more general term and applies to not-turbos as well) an automated is a surefire mode to dramatically reduce its life expectancy. its but a way for autos to build up engine speed/power for the launch, just its less harsh on the drive train than a neutral drop.

Post by **Nychold** » Wed Mar 19, 2008 ix:17 pm

Brake boosting is used for when y'all want to race from a roll rather than a dig. Since you're already cruising, you're driving in vacuum, non in boost, so when you mash the gas, you have to spool the turbo. But, if you concord the brakes a scrap, and requite it gas, the load on the engine can pre-spool the turbo, reducing the "turbo" lag.

From a dig, it'southward basically meaningless since yous SHOULD hold a automobile at higher than idle RPMs before you launch (which is substantially "brake boosting").

Post by **jomotopia** » Wed Mar 19, 2008 ix:30 pm

you tin can intermission the WRX tranny launching hard, so be conscientious. the AWD doesn't allow the wheels to spin so the drivetrain takes all the hit.

when the clutch is downward you won't build boost by only holding the gas b/c there's no load on the engine. as y'all button the throttle you will go some heave only if you're just holding it steady the boost will die off.

in an auto the engine is trying to pull the machine and the brakes are holding it back and then there is load and yous tin build boost. the style he does it is the best way to launch an car, turbo or non.

you can also restriction boost while moving for a rolling launch with an auto or stick. just apply heavy throttle, and enough restriction to keep the speed steady, rpms and load volition rise and boost volition build, so release the restriction and floor it to get. this is pretty hard on the brake pads though.

Mail by **Giant Robot** » Thu Mar 20, 2008 ii:11 pm

jomotopia wrote:when the clutch is downwards you won't build boost by simply belongings the gas b/c there'south no load on the engine. as y'all push the throttle you volition get some boost but if you're just holding information technology steady the heave volition die off.

in an auto the engine is trying to pull the motorcar and the brakes are holding information technology back so there is load and you can build boost. the mode he does it is the all-time mode to launch an motorcar, turbo or not.

yous can also restriction boost while moving for a rolling launch with an automobile or stick. just apply heavy throttle, and enough restriction to keep the speed steady, rpms and load will rise and boost will build, so release the brake and floor it to go. this is pretty hard on the brake pads though.

+1. An car can build boost more easily, since brake boosting from a dig is simply similar brake launching. Restriction boosting can be done on a manual, but it requires extra equipment. I've seen them bachelor, though.

Mail by **bde** » Thu Mar 20, 2008 2:52 pm

Thank you guys-very informative!

Was totally clueless on the subject so had to ask)

I've heard people actually brake boosting past heel-toe manual setup and slipping the clutch from reading the forums and I can see that it tin can work, but requires a lot of practice - but enough to destroy your clutch/tranny doing that:) However y'all can;t rev that high and you can burn out clutch hands while slipping under load.

Jomo - you said that when u rev with clutch pedal pressed you genereate no boost since you have no load, but don't y'all still spool turbo by going loftier in the rev range and so that when yous launch from standstill yous have no turbo lag?

Thanks!

p.southward. btw when car magazines or manufacturers post 0-60 times, do they ever employ these techniques?

Mail by **jomotopia** » Thu Mar xx, 2008 2:55 pm

bde wrote:Jomo - y'all said that when u rev with clutch pedal pressed you genereate no boost since you lot take no load, only don't you even so spool turbo by going loftier in the rev range so that when you launch from standstill you accept no turbo lag?

every bit long as y'all launch right away while the rpms and boost are on the upswing then yes. but if you rev to 4k and just hold it in that location (which won't take much throttle) then no, the turbo won't withal be spooled.

basically you lot desire to floor it and launch every bit the revs are climbing. don't difficult launch your automobile too much though, you lot could break something and the dealer will likely merits abuse.

Thu Mar 20, 2008 3:13 pm

bde wrote:I've heard people really restriction boosting past heel-toe manual setup and slipping the clutch from reading the forums and I can see that it can work, but requires a lot of practice - but plenty to destroy your clutch/tranny doing that:) Nonetheless you tin;t rev that loftier and yous can burn out clutch easily while slipping under load.

p.due south. btw when motorcar magazines or manufacturers post 0-60 times, do they ever use these techniques?

This can be done, just it causes heavy wear (like doing a burnout by holding the brakes), and it's not very consequent, fifty-fifty if you're decent at information technology. And beingness consistent is important in a race.

As for car magazine numbers, never believe them.

Mail by **bde** » Thu Mar twenty, 2008 6:55 pm

jomotopia wrote:

bde wrote:Jomo - you said that when u rev with clutch pedal pressed you genereate no heave since you have no load, but don't you still spool turbo by going high in the rev range so that when y'all launch from standstill you take no turbo lag?

equally long as you lot launch right abroad while the rpms and boost are on the upswing then yes. only if you lot rev to 4k and merely hold it there (which won't have much throttle) and so no, the turbo won't still exist spooled.

basically y'all want to flooring it and launch as the revs are climbing. don't difficult launch your car as well much though, yous could break something and the dealer will likely claim abuse.

Gotcha) Thanks!

Not practicing hard launches any fourth dimension soon- just getting educated about stuff for at present:)

Post past **bde** » Thu Mar xx, 2008 6:58 pm

Giant Robot wrote:

bde wrote:I've heard people actually brake boosting past heel-toe manual setup and slipping the clutch from reading the forums and I can encounter that it can work, but requires a lot of practice - just enough to destroy your clutch/tranny doing that:) Even so you can;t rev that high and you can burn down out clutch hands while slipping under load.

p.south. btw when machine magazines or manufacturers post 0-lx times, do they ever use these techniques?

This tin be washed, merely it causes heavy article of clothing (like doing a burnout past holding the brakes), and it'due south non very consistent, even if you're decent at it. And being consistent is of import in a race.

As for machine mag numbers, never believe them.

Figured as much:) After reading the replies , I'thou pretty much negated brake boosting equally a potential thing to endeavour in the future - pretty useless technique that destroys your cars' internals. Isay if yous want good launches spend more money and get a car that can get it right without any of that rubbish)

Post past **comingbackdown** » Friday Mar 21, 2008 8:27 am

bde wrote:

Giant Robot wrote:

bde wrote:I've heard people actually brake boosting by heel-toe manual setup and slipping the clutch from reading the forums and I tin can see that it tin work, simply requires a lot of practice - simply enough to destroy your clutch/tranny doing that:) Nonetheless you tin;t rev that high and yous can burn out clutch hands while slipping under load.

p.s. btw when car magazines or manufacturers postal service 0-60 times, exercise they ever apply these techniques?

This tin be done, only information technology causes heavy vesture (like doing a burnout by holding the brakes), and information technology's not very consistent, even if you lot're decent at it. And being consistent is important in a race.

Every bit for car magazine numbers, never believe them.

Figured equally much:) After reading the replies , I'm pretty much negated brake boosting as a potential thing to try in the future - pretty useless technique that destroys your cars' internals. Isay if you desire good launches spend more money and get a motorcar that tin can go it right without whatsoever of that rubbish)

I say if you desire proficient launches, accommodate to whatever auto y'all have.

Post by **Johnf514** » Fri Mar 21, 2008 9:36 am

A friend of mine had a fourscore's Supra turbo with automatic and showed me how to boost. He held downward the brakes and slowly rolled on the throttle. Manifestly, the wheels started "burning out," but not like you lot would retrieve. Instead of spinning madly, they were slowly rotating against the pavement while the car held in identify.

When nosotros took off, it was uber Grand-forces all over.

Post by **GarySheehan** » Fri Mar 21, 2008 3:13 pm

Yous tin can build boost in a transmission transmission turbo auto by bringing the revs way up, then blipping the throttle very speedily at those high rpms. It creates load on the engine, which builds boost.

Mail by **bde** » Fri Mar 21, 2008 8:59 pm

comingbackdown wrote:

bde wrote:

Behemothic Robot wrote: This can be washed, but it causes heavy article of clothing (like doing a burnout by property the brakes), and it'due south not very consistent, even if y'all're decent at it. And existence consistent is important in a race.

Every bit for car magazine numbers, never believe them.

Figured as much:) Subsequently reading the replies , I'one thousand pretty much negated restriction boosting every bit a potential thing to try in the future - pretty useless technique that destroys your cars' internals. Isay if you desire practiced launches spend more money and get a car that can become it correct without any of that rubbish)

I say if you want good launches, adapt to whatsoever car you have.

oh, i'g not complaining at all on my present machine. I 'm but proverb that if you have the need to go practice some restriction boosting on your car - so purchase a better auto which can give you a good launch without having to resort to such technique)

Post by **bde** » Fri Mar 21, 2008 9:02 pm

Johnf514 wrote:A friend of mine had a eighty's Supra turbo with automatic and showed me how to boost. He held downwardly the brakes and slowly rolled on the throttle. Apparently, the wheels started "burning out," just not like y'all would recall. Instead of spinning madly, they were slowly rotating against the pavement while the auto held in place.

When we took off, it was uber G-forces all over.

I e'er had an impression that a regular automatic can't launch equally fast as comparable stick. The restriction boosting on auto is like copying the revving up on the stick- otherwise you can simply time the pressing of the gas pedal if you lot dont build heave in auto. If you rev in neutral and switch to d- y'all tin actually damage your tranny similar that. And then brake boosting is the only resort for an auto I guess)

Gary- never heard of that- always nice to get some professional input)(not negative anyone else hither I hope) So if you practice the bleep - you intend to be rev limited and then dump the clutch every bit you are finishing the bleep? Tin you comment a bit on why this would put a load on the engine and assistance achieve better boost?

Thanks!

How To Brake Boost A Manual Car

brake boosting

restriction boosting

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