Brake boost

B5 S4/ RS4
#1

Last night I was playing some roll races… well the zo6 c6 have a tremendous response ,even more when they are modded( of course I got my ass handed pretty hard 8) boosting only 12lbs , no more excuses) , I was trying to brake boost in this car without much success ,was only getting 7-8lbs in 2gear at 40 mph ( we usually roll from 40 mph) So I start to think if the ECU gurus can do some type configuration to the ecu to emulate what for ex launch control do… (I know there is a little box that do that called wotbox)??
Well surfing in the GTR forums ::slight_smile: I found a very interesting device that do brakeboost via remote control, very nice little thing by the way .
Here its the little box

http://www.youtube.com/watch?v=R9g7wqEexPI&feature=channel&list=UL

pd; I did beat a e92 6speed manual m3… :smiley: So I was not the slowest…but not by much.

Thanks
Regards.

#2

Code changes have to be made to enable left foot braking as its called. Otherwise your car closes the throttle for a sort of soft limp mode.

If you have a custom tuner working with you they can enable this, it is three variables in the M-box code located at:

0x109D3 NWPMBBR - Minimum RPM for acc pedal value lockout on brake operation. stock value is 1200 rpms, I put it to 10,200rpm

0x109EB VWPMBBR - Minimum speed for acc pedal value lockout on brake operation. stock value is 3.75 kmh, I put it to 210kmh so at high speeds you cant do it and melt brakes, because in most of our cars we can.

0x109DC TWPMBBR - Delay time for acc pedal value lockout on brake operation. stock value is 2 seconds, I max it to 2.55 just because.

If you can suck your file out you can also do it yourself.

#3

very nice Snow trooper
I will do this when the new ecu arrive.
Thanks!!!

I just want it to ad that its pocible to do it without probs but its not boosting enough .

#4

ive noticed if i let of the gas then 3 sec later hold the brake wait a sec then apply the gas i can brake boost!

#5

same here

#6

Adam who showed you that?

#7

last night I did it … 2 gear roll 15 lbs… it s like night and day , I put aprox 2 cars right away to the m3 and almost half car to the z06 8)
now wait for the new tune…
regards

#8

Yeah it works well. And s6atron i showed my self that

#9

brake boost is enabled in your new file :slight_smile:

#10

So as I understnad it. this isn’t something you need turned on in the tune you just need to know how to do it.

#11

no, it has to be turned on, chances are people pulling off this 3 second trick have something in their code allowing or causing it. motronic is a big backwards complicated beast.