Testing: Tire / Speedo / Differential Calculator - try it out! - Page 2

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  1. #11
    CelicaSupra.com Member charles q's Avatar
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    Thanks for the help. No not 4.30. Changed out to 3.73 for the 7MGTE
    C.Q.
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  3. #12
    CelicaSupra.com Member Deanfun's Avatar
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    Quote Originally Posted by charles q
    Thanks for the help. No not 4.30. Changed out to 3.73 for the 7MGTE
    Gah, what I wrote was confusing. I meant to say that your car came with a 4.30 stock, meaning that you'd have a 10/35 combination. This kind of sucks because you have to change both gears as opposed to just the easy one.
    Dean L.
    1985 Toyota Supra - Hidden Content
    1987 Toyota Land Cruiser BJ73
    2007 Lexus LX470

  4. #13
    CelicaSupra.com Member Donn29's Avatar
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    What is the other gear, there is one at the end of the cable, are you talking about the one in the Trans?
    Current fun car: Black 86 with 7M-GTE/W58/3.58/TrueTrack, 300whp, 13.5@102.
    Wifeys Car: Burgundy 84 Auto and stock. Previous Daily: Two Tone Brown 84 Cressida: Sold and helped it get a 7M/W58 Swap
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  6. #14
    CelicaSupra.com Member Deanfun's Avatar
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    Quote Originally Posted by Donn29
    What is the other gear, there is one at the end of the cable, are you talking about the one in the Trans?
    There are two gears. One is located on the output shaft of the transmission, requiring you to remove the tailshaft to change it. This is the 10 or 11 tooth gear. The other (30-35 tooth) is just inside the tailshaft behind the 90 degree fitting that the speedo-cable threads onto. I believe this one is replacable be removing the 90 degree adapter and accessing it there. This is what I have been led to believe. Until I have messed around in there more, I won't say this information is totally correct. I plan on correcting my speedometer in the coming weeks, as I only have to replace the 30-35 tooth gear in mine to correct my ratio.
    Dean L.
    1985 Toyota Supra - Hidden Content
    1987 Toyota Land Cruiser BJ73
    2007 Lexus LX470

  7. #15
    CelicaSupra.com Member swank's Avatar
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    Does the R154 use the same part numbers?
    -Chuck

  8. #16
    CelicaSupra.com Member Deanfun's Avatar
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    Quote Originally Posted by swank
    Does the R154 use the same part numbers?
    That's a very good question. If someone can provide an answer... and the requisite part numbers if necessary, i'll include them (and the R154 final drive calculation) in the sheet.
    Dean L.
    1985 Toyota Supra - Hidden Content
    1987 Toyota Land Cruiser BJ73
    2007 Lexus LX470

  9. #17
    CelicaSupra.com Member SupraFiend's Avatar
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    I'll look that up in my epc some time soon, but the comments for the 30-35 gears I looked up in the epc didn't list the MA70s so I'm guessing the answer is no.
    Black 86 mk2 Project Car
    New SDR 86 mk2 Daily User, Highway Cruiser AND Parking Lot Abuser in the works!

  10. #18
    CelicaSupra.com Member droptopsupra's Avatar
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    Very Nice.

    Works great if you are swapping to a larger gear (numerically lower).

    What if I go from a 3.73 to a 4.30 on a n/a car?

    I will take a look at the formulas on the spreedsheet too.

    Thanks!

  11. #19
    CelicaSupra.com Member Deanfun's Avatar
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    Quote Originally Posted by droptopsupra View Post
    Very Nice.

    Works great if you are swapping to a larger gear (numerically lower).

    What if I go from a 3.73 to a 4.30 on a n/a car?

    I will take a look at the formulas on the spreedsheet too.

    Thanks!
    I've noticed it gets finicky when you get speedometer ratios on the high or low side of the available range. I'll take a look into it and see what I can do.
    Dean L.
    1985 Toyota Supra - Hidden Content
    1987 Toyota Land Cruiser BJ73
    2007 Lexus LX470

  12. #20
    CelicaSupra.com Member 1suprafan's Avatar
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    I'm not very good at reading your spread sheet. I have a 5 speed out of a 82 supra which came with a 3.73. I put the transmission in my 84 after auto swap but the rear end is still the 4.10. Could you tell me what I would need to do to get the speed right. Or would I need to get either a 3.73 rear end or a 4.10 transmission?
    Larry R.
    1984 L-Type 2nd owner. Auto to 5-speed. Rabid Chimp 6mge with SPEC aluminum flywheel and SPEC stage 2 clutch. Ported and polished head and intake. Rabid Chimp cone air filter and intake pipe. Raptor Racing 6 into 1 header, test pipe and cat back 2.5 exhaust system. Dobinson standard height springs. KYB gr2 struts and shocks. 1985 blue P-Type interior.

    2005 Matrix

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