RPM-MPH chart for W58 & stock wheels/tires - Page 2

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  1. #11
    CelicaSupra.com Member Ross's Avatar
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    120 is a lot short of 160 though
    I'm too lazy to type long replies.

    Ross from Oz

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    "Hotrod Supra"

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  3. #12
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    hmmm, i cant really claim a verified 5th gear max speed, however when i maxed out 4th in my 4.30 rear p-type the state trooper said i was going 110 mph.

    that is going totally from him though since my speedo starts swinging back and forth pretty wildly after about 90 mph.

  4. #13
    CelicaSupra.com Member joefoe's Avatar
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    I can do it easy! but it an't no stocker....
    Just an 82 supra Hidden Content

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  6. #14
    CelicaSupra.com Member dogstar's Avatar
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    Quote Originally Posted by Ross
    120 is a lot short of 160 though
    sure is, i was simply trying to make the point that 120 is easy, and i should have elaborated on that.

    120 mph isnt hard, with a mostly stock, unknown milage low compression 82.

    the problem with cars is, once you reach a certain speed, thats it, your aerodynamically limited, drag is equal to the forward motion provided by your drivetrain.
    as you get faster, it takes considerably more power to go any faster.
    look at modern cars and compare the gearing, power, weight, friction, and drag.
    then look at their top speed.

    usually, if you can find a car with everything else the same, except drag, your gonna notice a huge difference in top speed.

    basically what my long rambling confused post is trying to say is that i dont think a mkII is possible of an honest 160mph without insane power.

    its easy to read a speedo and say my car does 120 or 150 or whatever, but we all know stock instruments are pretty inaccurate.
    anyone wanna go to bonneville and bring a hot supra??
    - the Bentley Continental GT...at 1600 rpm it makes more torque than an entire production run of hondas
    - "Drifting...isn't that what homeless people do?"
    - Ah VTEC. All the lag, none of the turbo. It's like waiting for bad sex

  7. #15
    CelicaSupra.com Member
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    Power goes as the speed cubed so if 161 hp gives u 127mph (car and driver top speed as i remember) then u need 161* (140/127)^3 or 216 hp
    to get to 140 mph. prolly a little more hp required since wp losses prolly get horrific at 6500 rpm.

  8. #16
    CelicaSupra.com Member Ross's Avatar
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    According to StanS formula, how much power would it take to do 160 MPH with a 3.7 diff?
    Just wondering, and too lazy to work it out myself.
    I think that formula may be a little simplistic, as it doesn't take into account aerodynamics and drag, as mentioned by dogstar.
    (I should have mentioned the drag myself, which is why I said it would take an awful lot of power to hit 161)
    I'm too lazy to type long replies.

    Ross from Oz

    It's red
    It's had an engine swap
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    "Hotrod Supra"

  9. #17
    CelicaSupra.com Member Ross's Avatar
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    OK I worked it out using StanS supplied formula = 328 hp
    I still think it would require more than this though.
    It's just a gut feeling, I don't have any proof, but I would expect you to need at least 350 and maybe 400 hp
    I'm too lazy to type long replies.

    Ross from Oz

    It's red
    It's had an engine swap
    It has bigger wheels

    "Hotrod Supra"

  10. #18
    CelicaSupra.com Member
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    Strange. I routinely accelerate onto the freeway in 2nd gear. when I am going 100kms(60mph) I am only at about 5000rpm not 6000
    -Wil

    82 Ptype
    Moving not at all

    DOA

  11. #19
    CelicaSupra.com Member
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    as it doesn't take into account aerodynamics and drag,
    It does take aero and drag into account since the same car is used in both cases. It doesn't take non-linear losses (such as wp losses) with rpm into
    account. I'm only guessing that wp losses are not linear i.e. double the
    rpm and get more than double the loss.

  12. #20
    CelicaSupra.com Member
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    In fact the formula is solely based on aero drag. It predicts the power
    required to move the car at any speed. Gearing has nothing to do with it. Gearing only keeps the motor operating in it's design rpm range. Gearing will require different motor Torque so the motor will produce the required hp predicted by the aero based formula.

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