Hello,

Couldn't find anything regarding that in the search.

It might be a silly question, but I'd like some input regarding this. Has anyone tried it? Results? Thoughts? Experiences?

Myself I have, and I found that if you brake boost properly, the boost seems to last at 1.2BAR longer. Whereas if you just floor it sometimes it doesnt even hit 1.2BAR.

Other times when you brake boost and pass a certain point the car jumps and lets go of the throttle itself(I believe)

Would like to see what you guys come up with, whether stock or modified. Although our turbos are small and there's minimal lag, but minimal is not zero and its notice-able, soo..

-Hamad

 

Sorry to be ignorant here, but what is brake boosting?

 

It's when you hold the brake and gas pedal down at the same time to maintain a speed and build boost while doing so. Only thing is I didn't think the factory ecu would allow this?!

 

OK thank you. Put the car into Sport+ and do that and you are in Launch Control.

 

It's like a rolling launch. I didn't know these cars would do it without being tuned to do so. Mine is being tuned and having exhaust made for it right now or I'd mess with it. It's tough on the brakes over time.

 

Back on topic please

 

Anyways so UAE991, you're saying you're able to brake boost on stock ecu in the 991?

 

I would love to figure this out as well. Assumed blow off valves would open and purge boost at part throttle?

 

Thank you Chuck,

Regarding the topic, couple weeks back I opened a thread asking about maximum boost you get in a stock turbo. People said 1.2 initially on lower RPMs and then it drops to 1.0

Which is what I was getting aswell in a Turbo S, brake boosting however.. trying it made me notice getting 1.2bar of boost on higher RPMs and for longer.

However the computer stops you when you've held the boost for too long or you've braked too hard one or the other, but at some point it gives up and says no. but it's definitely do-able and you can, for a fact, brake boost in a stock turbo. What i decided to do(from experience so far) is brake boost til 0.5 or 0.7 and then go.

Would love to see some of you guys try and see what you come up with.

-Hamad

 

Is this better than launch control? I admit to being somewhat confused. I guess if you aren't in sport maybe its one way to get going without going to sport plus?

 

To my understanding brake boosting is applied from a roll on. Say you are going at 50km. Someone pulls next to you and you try to find a fine line between braking and accelerating at the same time. So basically you are getting some boost staying at the same speed at 50. Once you let go, you get a stronger pull from that certain speed because of the boost being generated.

Think of it this way. You go at 50km being in gear 2. You are around 4 - 4.5k.
If you do not accelerate you will see there is no boost building up. (Psi or bar). With brake boosting you will get some psi going before you let go.

Hope that helps.

 

Oh, OK, wow, that seems to me like it would be hard on the brakes. I get the reasoning though, especially if you are just driving around in sport and get challenged to a roll race. Otherwise I would say that if you can get to sport+, the computer will pick the right gear and get to it pretty quickly I think. There was a feature on the M5 that if you pushed the pedal all the way down to where it clicked, it would downshift to the best power gear for the speed you were going and increase boost at the same time.