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  1. 10-04-2012 09:28 PM #1
    Blown67
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    freeway brake boosting???

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    I have a 2000 b5s4 6 speed. is there a proper or improper way of brake boosting my car. Its a stage3 ko4's btw. just dont want to damage something.
    2000- B5S4 silver 6mt-asp stage3-KO4 Turbos-OEM RS4 Inlets-ASP Stage3 Fueling w/60lb Dekas-ASP 4 program ECU(Stock, Valet, 91 Oct, 93 Oct)-Slipping Stage4 clutch Clutchmasters -ssac 3" dp, 3.5" single pipe 2-Borla xr-1's exhaust-New 034Street Density Motor Mounts-New 034Street Density Trans Mounts-Apikol Rear Diff Mount- ER SMIC's, Vogtland coilovers (225K miles)
    56' Oval bug project for my Daughter
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    In search of a cool project for my son.
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  2. 10-04-2012 09:57 PM #2
    CELison
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    you have k04s. no need really.
    B5 S4- K24s, built bottom end, E85 - Gone
    B9 S4- EPL/AWE
    996TT X50 - Marski 700hp
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  3. 10-04-2012 10:32 PM #3
    Rdp616
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    I tried doing it just messing around and it wouldn't let me. As soon as i apply the brake it cut's the throttle. Perhaps it's the stock tune .
    Single Turbo Hibiscus coming soon
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  4. 10-04-2012 10:37 PM #4
    z00lander
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    Brake boosting requires a tune
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  5. 10-05-2012 01:15 AM #5
    BoostinonYOU
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    Step 1 take foot off of accelerator.
    Step 2 apply pressure to brake pedal.
    Step 3 apply pressure to gas pedal :/
    APR Stage 1 13.0009 @ 105 FULL INTERIOR | 100 OCT RACE GAS

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    I have a faster 1/4 time but no slip, didn't bring my helmet and promptly got kicked off the track w/o time slip :(
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  6. 10-05-2012 04:20 AM #6
    Sl0w_S4
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    My stage 2 car does it but really no need for it with a ko4 car
    2000 S4
    Dillenger Tuned - RS4 K04 Housings with K24 compressor and RS6 turbine from SRM-JHM FMIC-034 Soild Mounts - 034 TBB
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  7. 10-05-2012 04:44 AM #7
    obijohn22
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    yessir, youll get throttle cut without a tune that allows brake boosting. Its a safety feature.
    "NIGHTMARE" Stage 3+ 2001.5 Brilliant Black S4. VAST sauce

    My shit goes like whoosh boom pshhh and like vroom and junk. So fast.
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  8. 10-05-2012 05:11 AM #8
    jesters22
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    i was always under assumption that u get throttle cut from the abs sensors kicking on. if u turn traction control off you can brake boost.

    but brake boostin is gay
    PARTING OUT A SILVER 2001.5 S4 PM ME FOR PARTS

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  9. 10-05-2012 06:23 AM #9
    julex
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    YOU CAN BRAKE BOOST WITHOUT A TUNE.

    End of story. See post #5.

    Proper tune will also allow you to apply brake pedal while having gas pedal applied without throttle cut but again, for brake boosting just follow #5 on stock and tunes without brake boosting feature.
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  10. 10-05-2012 03:15 PM #10
    Blown67
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    ok thanks, again still learning more and more about these cars. I was having same issues as others where it would cut the throttle off acting like i slammed on the brakes. Thanks again and yes the k04's wake up fairly easy without brake boosting. just thought i give it a try.
    2000- B5S4 silver 6mt-asp stage3-KO4 Turbos-OEM RS4 Inlets-ASP Stage3 Fueling w/60lb Dekas-ASP 4 program ECU(Stock, Valet, 91 Oct, 93 Oct)-Slipping Stage4 clutch Clutchmasters -ssac 3" dp, 3.5" single pipe 2-Borla xr-1's exhaust-New 034Street Density Motor Mounts-New 034Street Density Trans Mounts-Apikol Rear Diff Mount- ER SMIC's, Vogtland coilovers (225K miles)
    56' Oval bug project for my Daughter
    67' Mustang Fastback project for me
    In search of a cool project for my son.
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  12. 10-05-2012 03:47 PM #11
    omgwtfbbq!
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    Is your throttle cutting instantly or after 5-10 seconds? Mine has a delay before it cuts, but yeah on the highway there isn't any lag on my F4Hs.
    01 Sedan /// Brilliant Black ///F4H Frankenturbos w/ tubular manifolds /// J-Fonz stage 3- /// Borla 3" /// Darintake

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  13. 11-22-2014 01:28 AM #12
    christianb5s4
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    Resurrecting an old thread, but I tried brake boosting and as soon as I let of the brake and mashed the gas the car hit the normal 16psi before it instantly dropped to 5psi and wouldn't boost past that. Had to unplug the battery and reset the ECU before it started boosting properly again. No need on a K03 car but I also had my foot on the gas when I applied the brake.
    Imola 2001 Stage 3 S4: 324K - 157mph 1/2 mile - 543whp/530ftlbs Mustang Dyno - Built BEL Block - RS4 cams/intake - TTE600s - Ringer Racing Stage 5 - Etspec - SRM V3 Intercoolers - AA built trans - 4:1 Diff - Vast cooler - JHM Trio - 034 - H&R Coilovers - OZ Racing - SRM/SSAC exhaust
    2024 M3 Comp xDrive
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  14. 11-24-2014 10:56 AM #13
    omgwtfbbq!
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    Run VCDS and check for codes.
    01 Sedan /// Brilliant Black ///F4H Frankenturbos w/ tubular manifolds /// J-Fonz stage 3- /// Borla 3" /// Darintake

    I hate: FMICs, flat colors, A-pillar gauge pods, vented hoods, drilled brake rotors, SSAC products, Rotas, you
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  15. 11-24-2014 11:02 AM #14
    MikeyB3
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    These cars can produce oodles of power and even with 770s, I just choose the right gear. No need for brake boost.
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  16. 11-24-2014 01:43 PM #15
    christianb5s4
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    Agreed, just did it out of curiosity. Anything at 3k or above for K03 cars is pretty much instant spool. I unhooked the battery for a few minutes, car is back to normal.
    Imola 2001 Stage 3 S4: 324K - 157mph 1/2 mile - 543whp/530ftlbs Mustang Dyno - Built BEL Block - RS4 cams/intake - TTE600s - Ringer Racing Stage 5 - Etspec - SRM V3 Intercoolers - AA built trans - 4:1 Diff - Vast cooler - JHM Trio - 034 - H&R Coilovers - OZ Racing - SRM/SSAC exhaust
    2024 M3 Comp xDrive
    2016 A6 prestige w/ s-line, APR Stg 1, Melen TCU, PS4S, valcona S6 interior parts
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  17. 11-24-2014 08:32 PM #16
    MacDaddy
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    brake boost, factory coding on toyotas.
    the B5 S4 is like the mafia... there is only one way out!
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  18. 11-25-2014 01:12 AM #17
    snoozin_s4
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    I brake boost on STG 2 SMS tune and works very well. Follow post # 5. As for those of you that think its pointless with k03s. results vs various cars suggest over and over that brake boosting helps a lot!
    As for gearing when brake boosting.
    20roll-2nd
    30roll-2nd
    40roll-3rd
    50roll-3rd
    60roll-4th
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