Good stuff guys...reminds me of the Who's on first routine for some reason.

Anyway, since turbos are spooled be the exhaust gas, brake boosting makes perfect sense, as a good blip on the throttle will get your boost up and then you're free to go. The s/c is (correct me if I'm wrong) controlled directly by engine speed and throttle input. So if you brake boost on a turbo, the boost will stay for the short amount of time you need to get back in gear, but on our cars, as soon as your RPM drops, your s/c will spin slower and you'll instantly lose whatever boost you had. That's what it seems like to me anyway, but maybe an expert can set me straight?

 

Wtf is a fraction???

Brake boosting was origionaly used while launching a car equiped with an automatic transmission. Left foot on the brake, right foot on the gas, release the brake when it's go time. Then the turbo guys figured out they could use it while on a roll to help defeat some turbo lag and it works fairly well for them.

However, this technique while be mostly useless on our cars from a roll (and impossible to do from a stop). Just downshift and punch it, *****!

 

My God...haha

 

It only depends on your torque converter, basically it's like sitting in 1st with your foot on the clutch, except based on your torque converters stall rating it will begin to engage at the stall rpm. In my truck I have a racing 3500 stall torque converter, so I can bring it up to about 3100 rpm before it starts spinning the tires. A torque converter is also called a "fluid clutch". Just though I'd shed a little light on the subject

 

I believe this is called brake torqueing since there is always boost on a automatic car.

 

actualy they are trying to get better boost performance from dragging the brakes it really isent needed in a turbo car that is a stick car

from the time the turbo starts to build boost to how long it takes to reach full boost is turbo lag and boost performance is how long it takes for the turbo to start building boost

a stall converters stall speed is based mainly off torque and the fin angle inside of the converter you can have a steep fin angle and the converter will be loose or you can have a shallow fin angle and have a tight conver now now how the engine plays in in figuring stall speed is by the amount of torque then engine produces the more torque the lore stall speed will be had if you have a 3000 rpm stall converter behind mild small block you foot brake the car to stall it up you may only see 2500 rpm of stall speed then you can take the same converter and put it behind a mild big block and and stall the car up and see 3400 rpm of stall speed is it possable for the same converter to reach an even higher stall speed yes it is when you release the brake and nail the go pedal the converter will do what is called flash and when the converter flashes you can see even more stall out of the converter to get a well matched converter for your app is to know what parts you used in the engine build up and that will get the person who is building the converter for you really close to what you want

if your turbo car is an automatic you want a prety loose converter so your well into the torque band of the engine and it puts a load on the engine and boost will then start to build i nice trick to do for a stick car that is turbocharged is to get an msd 2 step module and set the chip at a somewhat high rpm wiht your foot on the floor (like 3500 rpms) and while the engone is bouncing on the 2 step it builds boost so when you come out on the clutch your already setting at 3 to 6 lbs of boost and then the engine will build boost like a raped monkey as soon as the clutxh is fully released


mrb

 

What the hell? It's called brake BOOSTing for a reason. It's used for BOOSTing a turbo equipped vehicle. Torque brake is what a non boosted vehicle does. If there's no "boost" capability, then how can an N/A vehicle brake boost?

 

necro please! posts from 2006 haha