RPM-MPH chart for W58 & stock wheels/tires - Page 12

Page 12 of 12 FirstFirst ... 2101112
Results 111 to 120 of 120
  1. #111
    CelicaSupra.com Member Snafu_Bohica's Avatar
    Join Date
    Dec 2009
    Location
    Issaquah, WA
    Posts
    1,377
    My 1982 with 4:31, W58, 225/65-R14 and standard 5M only made it to 128 MPH, at ~6,750 RPM. Stock weight + 250lbs (I'm a big dude). I was heading down hill at about 10% Grade. The chart just looks a little off. I may be wring though.

    Quote Originally Posted by Tanya View Post
    just can't figure out a way to get a speed check unless you have a cop friend who'll clock you, heh
    or maybe an aftermarket speedo that does over 130?
    RE: My father has been an officer for 25 years (get outta jail free card)
    I was along side a 2008 Porsche... My speedo read past 85, that was as high as it went. But he signed "1...2...3-5." I took it as 100 + 20 + 3 + 5
    -Taylor Nielsen|Hidden Content
    9/1981 Production Number 4,913 Black MK2 P-Type "Desiree" - BillyM shift kit - LED dash swap - Fog Light Mod -Hidden Content in progress
    2001 Yamaha YZF600R. 1985 4runner with a 6" lift, 33s and all the fixins Had a white '82 and a black '83 in the past...
    Hidden Content

  2. Remove Advertisements
    CelicaSupra.com
    Advertisements

  3. #112
    CelicaSupra.com Member 83zed&supra's Avatar
    Join Date
    Oct 2008
    Location
    Van Nuys,CA
    Posts
    637
    Quote Originally Posted by Snafu_Bohica View Post
    My 1982 with 4:31, W58, 225/65-R14 and standard 5M only made it to 128 MPH, at ~6,750 RPM. Stock weight + 250lbs (I'm a big dude). I was heading down hill at about 10% Grade. The chart just looks a little off. I may be wring though.


    RE: My father has been an officer for 25 years (get outta jail free card)
    I was along side a 2008 Porsche... My speedo read past 85, that was as high as it went. But he signed "1...2...3-5." I took it as 100 + 20 + 3 + 5
    6,750 RPM? impossible, my 5m topped out at 6,6xx RPM on the freeway, BLAH BLAH it was at 3 in the morning and no one in site lol, i had to slow down because the wind popped my passenger window out a bit lol.
    but my 5m is a late high comp engine, and it's on an 83 with 4:10 gears, all i have done to the car is suspension and exhaust.
    1978 datsun 280z 5speed, 1983 datsun 280zx n/a, 1983 toyota supra p-type, 1983 toyota corolla coupe


    Hidden Content ..fun

  4. #113
    CelicaSupra.com Member Moorman's Avatar
    Join Date
    Mar 2003
    Location
    Carlsbad, CA
    Posts
    802
    Quote Originally Posted by Dakar2008 View Post
    chart doesn't seem right. im at 80 mph in 5th @ 3000rpm W58 and 3.73 lsd gps confirmed 205/60/15
    Let me provide some alternate sources:

    The pertinent inputs-
    W58 gear ratios
    5th gear = 0.783

    Tire diameter: 205/60-15 = 24.7in

    Rear Gear Ratio: 3.73

    The formula: mph = (rpm * tire diameter in inches) / (gear * differential * 336)

    mph = (3000 * 24.7) / (0.783 * 3.73 *336)
    mph = 74100 / 981.3
    mph = 75.5

    Alternate calulator

    IMO, if you feel the chart is off, it's more likely that some portion of the input is incorrect. My bet is that your RPM is inaccurate; next up is that your diff isn't really 3.73. Less likely is that the gps is wrong or, grasping at straws, you don't know how to read what's printed on your tire.
    -Jason Moorman
    1986 MkII
    7mgte 407rwhp 416rwtq
    Hidden Content
    Hidden Content

  5. Remove Advertisements
    CelicaSupra.com
    Advertisements

  6. #114
    Whistles racerxj220's Avatar
    Join Date
    Aug 2006
    Location
    Alabama
    Posts
    550
    I hope that information is correct. 8750rpms, 17 inch rim/tire = 24.7 (same as 15 inch tire above?????)

    (8750*24.7) / (1.00*4.10*336) = 156.88mph

    The dyno said 158mph in 4th (R154).

    I am just trying to calculate the speed because I have no speedometer.

    Calculated 208.35mph in 5th.
    Last edited by racerxj220; 08-12-2011 at 11:58 AM.

  7. #115
    CelicaSupra.com Member buhay6's Avatar
    Join Date
    Jun 2012
    Location
    Saskatoon Canada
    Posts
    351
    hhmm interesting, think I'm going to print this into a sticker and slap it on my dash so I can figure out what speed I'm doing for once. My speedo's out 60+ kmh it fluctuates as you drive.

  8. #116
    CelicaSupra.com Member punkara's Avatar
    Join Date
    Feb 2005
    Location
    florence, italy
    Posts
    166

    precise speedo on the MK2!

    With the 3.72diff, and its correct speed gear in the W57 and the speedo INTERNAL (all from the same Euro. spec MK2) behind the US standard MPH/kph dash, and 215/65R14 tires on the back, the speed is PRECISE! I clocked it on FEW roadside radars (used in Europe to show your speed so you can correct it) in different speeds, and I was stunned at the preciseness of my speedo!!! The reason I swapped the internal speedo mechanism, was because my original US Spec. one had over 330,000 miles on it and its gears were worn and the arrow would dance around, while the Euro spec. one I had only a bit over the equivalent of 111,000 miles.
    So it is safe to say that the Euro spec. MK2s had pretty decent speedo (safe for the larger rear tires I run 215/65R14 vs. 225/60R14).
    Last edited by punkara; 01-01-2014 at 03:45 PM. Reason: typo

  9. #117
    CelicaSupra.com Member
    Join Date
    Aug 2011
    Location
    Arlington, WA
    Posts
    1,158
    My 85P has always been a bit optimistic and with 225/60/15's, it's very close. I can't recall the diameter difference compared to the 225/60/14's but I think it's a bit over 4%. Most vehicles tend to read a bit high though. It's not uncommon for some motorcycles to be read way over reality, some by between 10 and as much as 15%!
    As far as top speed, my car has always been able to go faster in 4th gear and this is true of many vehicles. Upshifting to 5th and the engine just doesn't have enough power to sustain that speed. I've had mine verified by a friend with his police cruiser at 135 or so and might have had a few more in it but very few.

  10. #118
    Member ibmx610's Avatar
    Join Date
    Oct 2013
    Location
    Bethlehem, Pennsylvania
    Posts
    51
    Hate to continue to revive an old thread, but is there a way i can tell if i have an LSD without getting under the car? it sits relatively low to the point where its hard to get under plus its like 10 degrees out.
    Felix
    Rusty, daily 84 P-Type 'from hell'
    CS saved my (cars) life.
    Pod filter, Pacesetter Headers, removed exhaust from cat to muffler, ngk platinum spark plugs and wires.

  11. #119
    CelicaSupra.com Member SupraFiend's Avatar
    Join Date
    Mar 2003
    Location
    Vancouver, BC
    Posts
    9,054
    This thread is funny, all you guys doing math when there's a calculator made to solve all these problems for you with just a few button clicks! Have you all not seen DeanFun's Tire Speed calculator? It was posted 2 years after this thread started. ANYWAYS, I just solved a huge mystery in the land of correcting Toyota speedometers and magical part numbers, see this post in the aforementioned thread...
    http://www.celicasupra.com/forums/sh...866#post853866
    Black 86 mk2 Project Car
    New SDR 86 mk2 Daily User, Highway Cruiser AND Parking Lot Abuser in the works!

  12. #120
    Member
    Join Date
    Jun 2014
    Location
    chicago
    Posts
    57
    Quote Originally Posted by Tanya View Post
    would like to see someone pull 161mph out of a 3.73 mk2, that'd be nice...
    so far all I've heard was topping out at 125-135 in any particular mk2...
    mathmaticly it should be possible
    :?
    With Mathematics Anything Is Possible My Friend.. Lol
    Hidden Content "Who Needs A Radio, 5mge Is Music To My Ears."

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts