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Thread: Tuning Question

  1. #1

    Tuning Question

    I have a 2800lb, backhalved, '95 S-10 with a 10.5:1 360ci SBC. It has a solid cam (254/263 @ .050, lift: 534/555), Dart Iron Eagle heads (64cc, 2.02/1.60), roller rockers, Team G intake, Holley 750 double pumper. It has ladder bars with a Ford 9" and brand new 4:88 gears. The rear tires are 32x13.5 M/T Street Ets. I am running a powerglide trans with a hardened input shaft, 4500 stall converter and a pro brake. I am currently launching at 4300 rpm. I have an electronic shifter that shifts at 6600 rpms. My last year’s best was 7.41 in the 1/8 with a 4:11 gear and manually shifting at 6500 rpm. Last winter in when we added the new gears and the electronic shifter, and now my best is 7.66. I have tried adjusting tire pressure from 13 psi down to 9 psi, stopping at pretty much everything in between, because I was having a bit of trouble getting them to bite. I am thinking that next I will be adjusting the launch rpm and shifting rpm. Any ideas on why I lost .20? Any ideas on where I should look to get it back? Thanks.

  2. #2
    Senior Member RACING JUNKIE
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    which gears did it have it it last year ?
    David Lanning
    IHRA NHRA 387B

    Fleenor Racing Transmission
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    Complete Drag Car Wiring
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  3. #3
    Senior Member RACING JUNKIE BEAST477's Avatar
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    Quote Originally Posted by hammertime
    which gears did it have it it last year ?
    David it looks like he ran 4.11's last year and 4.88's now if I read it right.
    BEAST477






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  4. #4
    Senior Member RACING JUNKIE
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    Quote Originally Posted by BEAST477
    Quote Originally Posted by hammertime
    which gears did it have it it last year ?
    David it looks like he ran 4.11's last year and 4.88's now if I read it right.
    opps I did miss that, my guess is right there is why, motor dont like the rpms
    David Lanning
    IHRA NHRA 387B

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

  5. #5
    Senior Member MASTER BUILDER
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    from 1 s10 driver to another, put some slicks on it and try it. try some 31-10.50w's at @ 11-12# of air. what's your 60' time from last year to this year?

  6. #6
    Hammertime- What rpms would you suggest I run?

    sds10racer- I am afraid that I don't have any time slips from last year. I didn't start keeping records till this year, which I am finding out was really stupid.

    Thanks for the help...but keep the suggestions coming!

  7. #7
    Senior Member MASTER BUILDER
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    any 60' for this year. i've run 4.88 w/ 31-10.50w set up for the 1/4 and go thru the beams at 7.38 1/8 and 11.67 1/4. this is with a smaller cam and a 3500 stall. you should be able to do high 7.teens to low 7.20s if you hook.

  8. #8
    Here is my best 60ft time and the two times I ran 7.66. Beside weather tire pressure was the only change.

    Reaction 60ft ET Tire Pressure
    .5090 1.62 7.73 12 PSI
    .5540 1.6649 7.66 10.5 PSI
    .5048 1.6601 7.66 9 PSI

  9. #9
    Senior Member MASTER BUILDER
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    looks like you're tires like higher pressures. try going up. they might not be flat on the track with low pressure, cupping in the middle. when i ran the et street radials, ran 13# and ran about the same as the slicks for et.

  10. #10
    Senior Member RACING JUNKIE
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    Quote Originally Posted by gullion454
    Hammertime- What rpms would you suggest I run?

    sds10racer- I am afraid that I don't have any time slips from last year. I didn't start keeping records till this year, which I am finding out was really stupid.

    Thanks for the help...but keep the suggestions coming!
    I assume you have a tach in the truck, where did you cross for rpms this year vs last.
    David Lanning
    IHRA NHRA 387B

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


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