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  1. #1
    Junior Member
    Join Date
    Apr 2016
    Posts
    2

    600+hp gear ratio and RPM help

    hello guys,


    I am newbie here, so maybe Ill ask some dumb already 100x asked questions - but Iv checked the forums and cant find my answers...
    Also please excuse my bad english.


    Almost 3 years I am buliding my Mustang 2005, bellow please find very short list of main changes and modifications.
    Now i am on 600hp and 810Tq and best 1/4time 11.9 - and I am stuck there...
    I think I should have a beter time, but I am not sure.


    My main actual question is about gear ratio, tire preasure, shift point and launch RPM.


    (My final goal is 1/4 time 10.xx, but its a long way, I know.)
    (I still think that I should get more HP from this engine, but I am stuck there aswell)


    Ill be glad for any advices, thank you in advance!






    **** E N G I N E ****


    5.0L MODULAR STROKER SHORTBLOCK M-6009-A46X
    1.9L TVS VMP Supercharger
    66mm Supercharger Pulley
    STOCK 3V HEADS (from 2005 4,6 V8 engine)
    FORD RACING HOT ROD PERFORMANCE CAMSHAFTS
    Manley 3V HP Valvev springs
    FORD RACING 47 LB/HR FUEL INJECTOR SET
    FORD RACING Throttle Body OEM 60mm GT500 2007-2014
    FORD RACING HIGH PERFORMANCE DUAL FUEL PUMP KIT (05-09 GT)
    AFCO PRO-SERIES HEAT EXCHANGER W/ FANS (07-12 GT500)
    Kooks Headers Long Tube Headers + Kooks Headers X-Pipes (no cat)
    Kenne Bell Boost-A-Pump
    Kenne Bell Boost-A-Spark
    MSD Launch Control


    *** DRIVETRAIN ***


    STEEDA TRI-AX SHORT SHIFTER - TR-3650 (05-10 GT)
    McLeod RST Street Twin Clutch Kits 6912-03
    McLeod Aluminum Flywheels 563408
    FORD RACING 4.10 GEARS (05-09 GT)


    *** SUSPENSION ***


    BMR Control Arms, controls, relocation, sway bar, K-member
    stock springs
    Strange Externally Adjustable Mustang Shocks
    Air Lift 1000 Load Assist Rear Spring Kits


    *** WHEELS ***


    15" Weld Racing Draglite Polished Wheels 90-510354
    315/60-15 Mickey Thompson ET Street Radial Tires 3763R



    Dyno tested 600 RWHP, 810 troque
    Shift point 6000 RPM (limeter 7000 RPM)
    Launch RPM 2800
    Tire preasure 8 psi


    If you check my time slips, yesterday Iv started on 12,4sec and ended on 11.915 sec (1.815 6oft)
    (we changed only launch RPM and tire preasure during the day)
    but my max speed is still almost exactly 195 km/h - and I dont know why.
    I cant improve my 1/4mile time anymore.


    I have few questions:


    ==1==
    with 600hp and 810Tq, should I still go with 4.1 gear ratio?


    ==2==
    I think that 2800 launch RPM is far too low - but with this tires tire preasure I cant go higher
    any advice?


    ==3==
    generally, I would like to ask you for any advices, how to improve my 1/4 time with this car configuration, or what changes are you recomending.


    ==4==
    if you check the dyna graph, what shift RPM can you recomend?


    ...and:
    I am doing something wrong - or I simply cant go faster with 600hp?


    Thank you very much for your help!


    Tomas
    Attached Images Attached Images

  2. #2
    Senior Member
    Join Date
    Nov 2010
    Location
    Long Beach, New York, United States
    Posts
    762
    Those Dyno numbers don't add up to me with the combo posted.

    4.10 and a 30" tire should be a workable combo

    you're launching too soft.

    you're shifting too low at 6000

    Tire pressure seems too low as well. Have u tried higher pressures?


    how are you doing you're burnout? Gear? MPH? Details

    with 600 hp you should be well faster.

  3. #3
    Junior Member
    Join Date
    Apr 2016
    Posts
    2
    hello,


    Quote Originally Posted by stkjock View Post
    Those Dyno numbers don't add up to me with the combo posted.
    why?


    Quote Originally Posted by stkjock View Post
    4.10 and a 30" tire should be a workable combo
    v checked the calculations and it seems I should use 26" (or 28") to cross the line with atleast 6500RPM


    Quote Originally Posted by stkjock View Post
    you're launching too soft.
    you mean too low RPM on launch - or bad 60ft time?
    note: we are racing on non-penetraed strip..


    Quote Originally Posted by stkjock View Post
    you're shifting too low at 6000
    Ill tro to go up to 6400


    Quote Originally Posted by stkjock View Post
    Tire pressure seems too low as well. Have u tried higher pressures?
    yes, I did - but cant properly launch - wheels spin whole 1 gear


    Quote Originally Posted by stkjock View Post
    how are you doing you're burnout? Gear? MPH? Details
    gear 3


    Quote Originally Posted by stkjock View Post
    with 600 hp you should be well faster.
    true..

  4. #4
    Senior Member
    Join Date
    Nov 2010
    Location
    Long Beach, New York, United States
    Posts
    762
    See red below

    Quote Originally Posted by TomasV View Post
    hello,



    why?
    Because in 8 years I e never seen a blower 3v make more tq than HP unless a big nitrous shot was also there.


    v checked the calculations and it seems I should use 26" (or 28") to cross the line with atleast 6500RPM

    yes 28" would be better


    you mean too low RPM on launch - or bad 60ft time?
    note: we are racing on non-penetraed strip..

    Too low RPM, however, if it's no prep, well you're not going to do much better.



    Ill tro to go up to 6400

    Even 6400 seems low, 6700-6800 with a built motor and spring upgrade.


    yes, I did - but cant properly launch - wheels spin whole 1 gear

    Odd, those radials usually work well in the 12psi -14 area


    gear 3

    Thats good if you're seeing at least 60 MPH

    true..

 

 

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