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Thread: rer gear confusion.

  1. #1
    Senior Member MASTER BUILDER
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    rer gear confusion.

    hey guys I know yall have answered 1000's of these questions about rear gears. But now I'm getting a little confused and need some help on these equasions. now these are 1/8 mile numbers I have a 5.14 gear/ powerglide 1.76-31''tires and going thru the lights @ 6.10 et and 111.57 mph at 6200 rpm, now my 670 hp comes in at 6700 so to go thru the lights at 6800 w31'' tires the calculaters say I need a 5.67 gear. ok thats good but the MPH stays the same that I understand, now does this mean I will be getting quicker 330 ft times and slower the 2nd half and would it still equate to a 6.10 et at 111 mph, ??? just quicker on the 1st 1/2 of the track. car is 85 camaro 2700 me in it. 434 sbc. I leave off the brake at 4000 I shift @7000 Thanks
    I did all these calculations on wallace racing and this is asuming that you want to go through the lights at Max H/P and get to max H/P as quick as possible comming off the tree.
    Thanks Andy

  2. #2
    Senior Member RACING JUNKIE
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    Wow...my converter must be crap cause I run the same combo as you (trans ,gear, tires) except my tires are 32" tall and I cross the line at the same mph but at 6800 rpm. :?

  3. #3
    Senior Member RACING JUNKIE
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    Re: rer gear confusion.

    Quote Originally Posted by andybyrd
    hey guys I know yall have answered 1000's of these questions about rear gears. But now I'm getting a little confused and need some help on these equasions. now these are 1/8 mile numbers I have a 5.14 gear/ powerglide 1.76-31''tires and going thru the lights @ 6.10 et and 111.57 mph at 6200 rpm, now my 670 hp comes in at 6700 so to go thru the lights at 6800 w31'' tires the calculaters say I need a 5.67 gear. ok thats good but the MPH stays the same that I understand, now does this mean I will be getting quicker 330 ft times and slower the 2nd half and would it still equate to a 6.10 et at 111 mph, ??? just quicker on the 1st 1/ of the track. car is 85 camaro 2700 me in it. 434 sbc. I leave off the brake at 4000 I shift @7000 Thanks
    I did all these calculations on wallace racing and this is asuming that you want to go through the lights at Max H/P and get to max H/P as quick as possible comming off the tree.
    Thanks Andy
    Whats it 60ft now ...
    my guess just by the info you have giving is your converter is off, 5.14 gear should spin much higher then that with the right converter.
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
    419-280-1406
    Lanning Electric
    Complete Drag Car Wiring
    APD Race Engines
    www.apdracing.com

  4. #4
    Senior Member RACING JUNKIE
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    I'm curious to know what stall converter you have and if it will stall at what it's supposed too. On the good side you can run a 1/4 mile with that gear and converter setup.

    JMO

    Zip.

  5. #5
    Senior Member RACING JUNKIE
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    Not to highjack but does mine sound like it's too loose? I cross at 110-112 mph and I'm usually coming up on 7000 I'd say 6800 at least......I have a 5.14 ,glide and 32x14 tires with an 8 inch COAN.

  6. #6
    Senior Member MASTER BUILDER
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    Tod I had 32 x 14's M/T's and was going thru at 6050 rpm and 114 mph at 6.15 now I'm running 31 Hoosiers my converter is a 8'' coan and it spins to 5000 with the brake and no chip. they said it was a 5500 but it won't spin to that. my 60' is 1.38 oh yea my 1/4 mile times were 9.72 @ 140 MPH 7500 rpm, and Tod your not highjacking this post the more info we get the better, and I really don't understand this whole converter slipping thing anyway, I don't understand why they should slip ?
    Thanks Andy

  7. #7
    Getting back to the original question, a higher numerical ratio will allow the engine to operate near the power peak over a greater portion of the track. This means a higher trap speed. It should also mean a better 60, but a poorly set up suspension can cancel...or even reverse...that benefit.
    http://www.racetec.cc/shope

  8. #8
    Senior Member MASTER BUILDER
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    Billy thanks for the reply our track has been closed do to our bad weather but I a waiting the sun so I can go and try this out, I bought a 5.67 chunk so I'll see. Everyone thats looked at the car says it looks like its put together well. but seeing ain't allways the case.
    Thanks Andy


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