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Thread: Anyone have Gear/RPM/MPH Charts?

  1. #1
    beyerch is offline Cadillac Owners Member
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    Anyone have Gear/RPM/MPH Charts?

    Anyone already worked up a chart showing Gear/MPH/RPM?

    Thanks!


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    youknooow is offline Cadillac Owners Enthusiast
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    Go to road and tracks website and pull up their road test archives.

  4. #3
    beyerch is offline Cadillac Owners Member
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    Re: Anyone have Gear/RPM/MPH Charts?

    ok....

    Used the gear ratio info they had to put together a model for MPH RPM Gear .... Feel free to look over and let me know if the math looks right.

    Thanks

    https://skydrive.live.com/redir?resi...Gkzv82aw2MoD0s

  5. #4
    bobs-sts-v's Avatar
    bobs-sts-v is offline Cadillac Owners Fanatic
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    Re: Anyone have Gear/RPM/MPH Charts?

    Maybe on a dyno with no wind resistance, but I doubt the graph is linear once you get past 50 or 60 mph due to wind resistance and other such factors (mechanical resistance, etc). 254 mph? Didn't know we were competing with the Veyron!

  6. #5
    beyerch is offline Cadillac Owners Member
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    Re: Anyone have Gear/RPM/MPH Charts?

    Bob

    - Yeah I didn't account for wind resistance..... I could probably tweak it the next time I'm bored.
    - 255 MPH, I just calculated out to 6600 RPM for all gears. Never said you'd actually make it that fast!

  7. #6
    GizmoQ's Avatar
    GizmoQ is offline The Last Good Gremlin
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    Re: Anyone have Gear/RPM/MPH Charts?

    Quote Originally Posted by beyerch View Post
    Bob

    - Yeah I didn't account for wind resistance..... I could probably tweak it the next time I'm bored.
    - 255 MPH, I just calculated out to 6600 RPM for all gears. Never said you'd actually make it that fast!
    Your two biggest variables above 120MPH are wind resistance and the significant loss of torque in 5th and 6th gear (both overdrive gears). I can still pull in 5th, but the tranny does not like it. Luckily, in the Texas Mile, I was only in 5th for a few seconds on one of my runs.

    I also know for a fact (two years of Hot Rod Power Tour) that I can cruise all day long in 6th at 2200RPM averaging 100MPH.... hmmmm



    FIXED!!!!
    Last edited by GizmoQ; 09-12-13 at 08:02 PM. Reason: Fixed RPM #
    Snake Bit Super Chilled Black Raven 2006 Cadillac XLR-V aka Elwood (Jake's brother)
    Verified 510RWHP and 546TQ so far...final goal 575/550

    ELWOOD - "Corvette in a Tuxedo ... with a Jet Pack"



    2013 St Louis Region SCCA Solo SSM Class Champion
    Texas Mile Record Holder: Street Legal XLR @ 165.6MPH
    ECTA LSR Record Holder: 4.2-5.0L Blown Gas Modified Sports Car

  8. #7
    beyerch is offline Cadillac Owners Member
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    Re: Anyone have Gear/RPM/MPH Charts?

    Gizmo - Then do you have some input as to where the math is wrong for 6th gear? Used the drive ratio from the above referenced article and used standard formulas for calculating. There appears to be about a 20 mph difference between my math and your butt speedo. Suggestions?

  9. #8
    1madstsv's Avatar
    1madstsv is offline Cadillac Owners Connoisseur
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    Re: Anyone have Gear/RPM/MPH Charts?

    Yea my car is at 2000 at 70-75. 1900rpm is way low.

  10. #9
    GizmoQ's Avatar
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    Re: Anyone have Gear/RPM/MPH Charts?

    Quote Originally Posted by beyerch View Post
    Gizmo - Then do you have some input as to where the math is wrong for 6th gear? Used the drive ratio from the above referenced article and used standard formulas for calculating. There appears to be about a 20 mph difference between my math and your butt speedo. Suggestions?
    MY BADDDD!!!! I just checked my data logs from HRPT12 and 109MPH is 2345RPM. Other data points collected:

    12-1400rpm/55mph (my car wont go into 6th until 60MPH then I back down - trans tune)
    1500rpm/69mph
    1630rpm/75mph
    1689rpm/78mph
    1733rpm/80mph
    1780rpm/81mph
    1820rpm/83mph
    2200rpm 100mph
    2345RPM/109MPH

    The graph is still off for my car. Maybe my rear gears are different.
    Snake Bit Super Chilled Black Raven 2006 Cadillac XLR-V aka Elwood (Jake's brother)
    Verified 510RWHP and 546TQ so far...final goal 575/550

    ELWOOD - "Corvette in a Tuxedo ... with a Jet Pack"



    2013 St Louis Region SCCA Solo SSM Class Champion
    Texas Mile Record Holder: Street Legal XLR @ 165.6MPH
    ECTA LSR Record Holder: 4.2-5.0L Blown Gas Modified Sports Car

  11. #10
    1madstsv's Avatar
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    Re: Anyone have Gear/RPM/MPH Charts?

    Biger tires deferent wheels??

  12. #11
    GizmoQ's Avatar
    GizmoQ is offline The Last Good Gremlin
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    Re: Anyone have Gear/RPM/MPH Charts?

    Quote Originally Posted by 1madstsv View Post
    Bigger tires different wheels??
    Actually the tires on the power tour were shorter and wider.
    Snake Bit Super Chilled Black Raven 2006 Cadillac XLR-V aka Elwood (Jake's brother)
    Verified 510RWHP and 546TQ so far...final goal 575/550

    ELWOOD - "Corvette in a Tuxedo ... with a Jet Pack"



    2013 St Louis Region SCCA Solo SSM Class Champion
    Texas Mile Record Holder: Street Legal XLR @ 165.6MPH
    ECTA LSR Record Holder: 4.2-5.0L Blown Gas Modified Sports Car


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