top speed 4th gear

Discussion in 'SN95 4.6L Mustang Tech' started by WRXracer, Dec 12, 2003.


  1. WRXracer

    WRXracer New Member

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    ok what is the top speed with 410s and 430s in forth gear..


    how high do you rev..
     
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  2. WRXracer

    WRXracer New Member

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    ok

    there has to be drag racers that know this..
     
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  3. Dark Knight GT

    Dark Knight GT I can't get it up......ok that didn't sound right.

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    Ok, Im going to give you some gear calculations based a five speed transmission, the T-45. Theese gear calculations are also based with a 26in. tall tire w/ 4.10 gears.

    T-45

    4th gear@5800rpms = 109.422
    4th gear@5900rpms = 111.308
    4th gear@6000rpms = 113.195
    4th gear@6100rpms = 115.081
    4th gear@6200rpms = 116.968

    Here is a link to the site with the gear calculator is you wish to do more calculations.
    http://www.tchracing.com/tech/gearc...givenval=5800&givenvaltype=RPM&selectedgear=4
     
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  4. WRXracer

    WRXracer New Member

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    cool

    im getting 430 gears..
     
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  5. NitroDuck

    NitroDuck I put out on the 1st date Founding Member

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    My 4th is done at about 110-112 running it out the back door to redline.
     
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  6. TrueBlueCajun

    TrueBlueCajun Founding Member

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    I've done 130+ several times in 4th gear......unfortunately I still have 3.27s. :(
     
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  7. Huck

    Huck New Member

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    I calculate 113 mph w/ 4.10's, 26" effective tire diameter, and 6000 rpm. 4.30's would be 113 x 4.1/4.3 = 108mph.

    If your tire diameter is bigger, multiply whichever number (108 for 4.30's or 113 for 4.10's) by your tire diameter divided by 26. If you want a different engine speed, multiply by the new engine speed/6000.

    It is: speed = (rpms x diameter x 3.1416 x 60) /(rear ratio x 12 x 5280)

    or, more simply, speed = (rpms x dia.) / (336 x ratio)

    If you want to check it for other gears, just multiply the trans ratio by the rear ratio, and plug that total ratio into the formula.
     
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