ae_xiong

iTrader: (3)

Hey everyone, just wondering if anyone here with the zfr brake boosts or not? I have a 09 ss/tc with full-bolt ons and zfr/Powell 4.45 tranny and I was curious how many psi should I be boosting if I were to brake boost on a roll of course in 2nd gear at about 40 mph? What is the recommended psi to be at? Thanks in advance.

BigBoost954

iTrader: (1)

I brake boost to about 20psi on my stock trans . Lol

ae_xiong

iTrader: (3)

You can't be serious right? That's almost full boost... especially on stock tranny? I've got the 4.45 and I'm not even willing to push it that high. LOL I was thinking of something in the teens maybe?

I'm on 91 octane and roughly 24 psi btw...

tomj77

iTrader: (2)

I don't even know how to brake boost , I mean I do but I can't do it lol nor do I want to abuse my brakes like that lol

Shortbus

Not needed on a zfr, it spools so fast as is.

AaronJ

iTrader: (4)

That's exactly what I was thinking. Just make sure when you start the race you are above 3k rpm and you'll spool instantly. The thing slowing us down the most is probably the time it takes the drive by wire throttle body to open fully

BigBoost954

iTrader: (1)

Just saying I do I'm on e47 28psi. Stock trans I brake boost it

ae_xiong

iTrader: (3)

Hmmm... I think that's still very high even on e47. LOL but hey, how much of a difference do u notice? Also, yea I can understand that it doesn't really need the brake boost to spool but when it's a close race and you're racing for money then it's something that's nice to have as an advantage.

08VRSS

I brake boost just enough to take it out of vacuum, thats all. Worked well raping an 04 cobra, a hemi magnum, an SRT4 with full bolt ons and an LSJ cobalt that was very surprised, 3rd - 4th gear, he got left about a 1/8 mile back once it hit 4th lol.

Stealth-TC

iTrader: (1)

Never tried this, can do it in 3rd aswell? I'd imagine it's gotta destroy your brake pads

ae_xiong

iTrader: (3)

How many psi were u at n how many psi r u boosting?

Sl0wbaltSS

He said enough to take it out of vac. = 1psi

alerosaint

I should have done that in my races

08VRSS

Yeah anywhere just out of vacuum, not much, and I'm at 25-26psi full boost

footballplaya3k

iTrader: (1)

Damn, you've got *****. Just have that backup tranny ready to go haha.

ae_xiong

iTrader: (3)

LOL Damn, that's only enough to wear your brakes... I doubt there will be any noticeable difference with only 1 psi but I guess... I'll just have to try myself and see what works for me. I was looking for a reference point but I guess I'll just have to experiment myself. Thanks anyways for all the input so far.

ae_xiong

iTrader: (3)

That's why I thought he couldn't be serious. LOL That's freaken high! Even on e-47... The only thing I can think of to justify brake boosting that high is if you're running for serious money or pink slip. Then at that point it will be do or die so to speak. But if you're just racing for sh*ts and giggles then it's really not worth risking your tranny. But then again, that's just my opinion...

ae_xiong

iTrader: (3)

Yea, after personally experimenting on my car... 2 Psi is a good place to start. It spools so fast that you don't even really notice much of a difference.
Would only recommend doing it on serious races where you have something to lose. If you're just racing for fun... Save your breaks, rotors, and wallet.

alerosaint

Fixed

colodude18

iTrader: (4)

Why is everyone so worried about wear on the brake pads? My pads probably take more abuse during a typical day of driving than they would brake boosting

ECaulk

iTrader: (6)

I really doubt most ppl drive like you do, I'd be more worried about than trans than the brakes

ae_xiong

iTrader: (3)

Well, considering how much WHP and WTQ you have... I wouldn't be surprised. I'm still on 91 and I'm only talking about a single event when I say it's not worth it unless you're racing. When you say a whole day... then well, it's the whole day driving with close to 500whp... I know you're not making all those ponies to baby the car around...

Shanedude

I have never tried brake boosting...Those rare "have to win" races is when I bust out the 2-3 and 3-4 NLS. Haven't done a 1-2 NLS though.

08VRSS

Just fyi, I baby my car lol. I rarely do the on ramp pull, save it mostly for those cocky 5.0s or vettes.