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SLP Speedometer Recalibration Box

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  • SLP Speedometer Recalibration Box

    Just wondering if anyone here has any experience with one of these??? I'm having a FIT of a time trying to get one to work on my car.
    Active Duty USAF KC-10 Boom

    93 F-Body Service Manual DTC and Driveability Charts

  • #2
    Well, not sure if it's exactly the same, but I have a "black box" like this. Works fine...except the ABS is now nonfunctional.


    What problems are you having?
    Al 96 Ram Air T/A
    Mods: Build # 784 * Hotchkis STB * SFCs * Borla cat back w/QTP cut-out * AS&M/RK Sports Mid-length headers w/single CAT * Koni SA shocks on lower perch w/ lowered rear * Strano Hollow front & rear antisway bars * 1LE front/rear springs * 1LE aluminum driveshaft * Strange 4.10 gears w/ Zexel Torsen diff. * ARP bearing cap studs & aluminum diff cover* J&M Hotpart poly/poly rear LCAs and poly/poly panhard bar * RAM Powergrip clutch w/ LT4 PP and RAM billet Al flywheel * C5 Z06 brakes * C6 Z06 wheels * Spohn T/A * Spohn DS Loop * fully custom interior w/ custom audio

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    • #3
      SLP speedo

      I have a 93 TransAm-with the SLP speedo adjustor. I got it because it was a lot cheaper than getting a new computer chip. Big mistake. It works OK until I stomp on the gas-then it gets really erratic! First time I noticed it-I was going about 90 mph and my speedometer showed about 50. As soon as I let off it slowly came back to normal.

      My best advice: wait until you do some more modifications-such as the rear end gears. Then it will be worth it to spring for a new chip with all the right adjustments built in-including the correct speed adjustment.

      Good luck-Scott

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      • #4
        Originally posted by Scott-93 TransAm
        I have a 93 TransAm-with the SLP speedo adjustor. I got it because it was a lot cheaper than getting a new computer chip. Big mistake. It works OK until I stomp on the gas-then it gets really erratic! First time I noticed it-I was going about 90 mph and my speedometer showed about 50. As soon as I let off it slowly came back to normal.

        My best advice: wait until you do some more modifications-such as the rear end gears. Then it will be worth it to spring for a new chip with all the right adjustments built in-including the correct speed adjustment.

        Good luck-Scott
        Scott, I hate to break it to you but there's no way to recalibrate the speedo on a 93 via the computer chip. I will admit that I just noticed that my speedo had done the same thing as yours, was reading 50 when I was doing 70, and once I stopped it had corrected. I'd believe that to be a signal interference issue, possibly a power or ground issue.

        I've got a cyberdyne box and Dakota Digital box both on the way that I'm going to try to work out also. My biggest issue with the SLP box right now is that my odometer doesn't seem to work hardly at all (50 mile trip to work showed 1.7 miles).

        Lastly Scott, check out the link in my sig for the speed density F-Body cars. You may like the site as it's a 93 specific site.
        Active Duty USAF KC-10 Boom

        93 F-Body Service Manual DTC and Driveability Charts

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        • #5
          Hey.I thought i read some wear slp has discontinued their speedo recalibration box due to issues as your explaining.I read Gm high-tech and they did a build up on an mid 90s camaro and used one and in that article or a later one i read that.Not this is any help.But I have the same problem with my 93.A lower gear set has been installed.Someone told me a gear my have to me changed on the vss?

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          • #6
            If you're an A4 you can change the driven and driven gears in the tranny tailshaft. If you're an M6 you MUST get some kind of recalibration box.
            Active Duty USAF KC-10 Boom

            93 F-Body Service Manual DTC and Driveability Charts

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