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Thread: 4:10's Trap Speed

  1. #21
    Senior Member silver03cobra's Avatar
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    Dont Let Jeff Drive Your Cobra!!!!!!!

    He Will Go Race Old Guys In Vetts!

    Ha Ha Ha Ha Ha Ha

  2. #22
    Senior Member P Machy's Avatar
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    SonicVenum almost hit his rev limiter (set at 7000 rpm) while trapping 131.96 at a Sea Level Track.

    He was pretty informative when he raced, but then again, he was losing alot of air from the screwed rims he had.

    From the tires I ran, the combination of tire pressure and duration of the burnout effected my top rpm too.

  3. #23
    Administrator BurnTire's Avatar
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    Quote Originally Posted by vtecthis349pony View Post
    Dont Let Jeff Drive Your Cobra!!!!!!!

    He Will Go Race Old Guys In Vetts!

    Ha Ha Ha Ha Ha Ha
    And they get their ass handed to them
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    2004 Cobra, Whipple ,TH-400
    Burning Corn
    9.97 - 135.5

  4. #24
    Administrator BurnTire's Avatar
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    Quote Originally Posted by P Machy View Post
    SonicVenum almost hit his rev limiter (set at 7000 rpm) while trapping 131.96 at a Sea Level Track.

    He was pretty informative when he raced, but then again, he was losing alot of air from the screwed rims he had.

    From the tires I ran, the combination of tire pressure and duration of the burnout effected my top rpm too.
    I think 4.10s are a little too much.

    I will go with 3.73 or 3.90's.
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    2004 Cobra, Whipple ,TH-400
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  5. #25
    Senior Member P Machy's Avatar
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    Quote Originally Posted by BurnTire View Post
    I think 4.10s are a little too much.

    I will go with 3.73 or 3.90's.
    I seen one too many motive gears lose a tooth or teeth.... 3.73 would be nice if you have the trap speed and 4.10's is almost perfect for my track. Almost meaning I wish I had taller tires then 25.7"...cross the line 400rpms beyond 6200 and forget sea level. 6700 ~ 6800rpm's.

  6. #26
    Administrator BurnTire's Avatar
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    Quote Originally Posted by P Machy View Post
    I seen one too many motive gears lose a tooth or teeth.... 3.73 would be nice if you have the trap speed and 4.10's is almost perfect for my track. Almost meaning I wish I had taller tires then 25.7"...cross the line 400rpms beyond 6200 and forget sea level. 6700 ~ 6800rpm's.
    Ultimately I would like to trap at 133-134 and Low 10's.

    The tracks are strict out here if you exceed 135 or go under 10.
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    2004 Cobra, Whipple ,TH-400
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  7. #27
    Senior Member P Machy's Avatar
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    Quote Originally Posted by BurnTire View Post
    Ultimately I would like to trap at 133-134 and Low 10's.

    The tracks are strict out here if you exceed 135 or go under 10.
    over 135mph? 140mph is where I thought you needed to worry about?

    3.73's look like you gear, but wont 28" tall tires be too much?

    I believe it is ok to over rev just a tad bit at the big end, but not by too much. Dont you only need like 138mph to dip into the 9's anyways? Full Weight, Great Short Time and Ratt Daddy style of shifting?

  8. #28
    Administrator BurnTire's Avatar
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    Quote Originally Posted by P Machy View Post
    over 135mph? 140mph is where I thought you needed to worry about?

    3.73's look like you gear, but wont 28" tall tires be too much?

    I believe it is ok to over rev just a tad bit at the big end, but not by too much. Dont you only need like 138mph to dip into the 9's anyways? Full Weight, Great Short Time and Ratt Daddy style of shifting?
    Ratt runs the 3:73's and things work well.

    I am looking for a good street strip gear.
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    2004 Cobra, Whipple ,TH-400
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  9. #29
    Senior Member 5.0Stanger's Avatar
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    Burntire, I just checked Speedworld's mph/rpm range calculator and it says that with a 28" tire and 4.10s, you should be running 132.1138211382114 at 6500 rpm. Of course, that's assuming you're in 4th gear.

    Hope this helps.
    '03 Cobra - Mildly modded. A work in progress. 12.566 @ 110.755, 1.89 60' on street tires
    '93 Notch - Looks faster than it is.
    '72 F100 4x4 - Dormant, for now.
    Race '99 L - 12.40 @ 110


  10. #30
    Administrator BurnTire's Avatar
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    Quote Originally Posted by 5.0Stanger View Post
    Burntire, I just checked Speedworld's mph/rpm range calculator and it says that with a 28" tire and 4.10s, you should be running 132.1138211382114 at 6500 rpm. Of course, that's assuming you're in 4th gear.

    Hope this helps.
    I added a ton of calculators to the site due to this question.

    Enjoy
    http://www.highperformancestangs.com....php?page=calc
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    2004 Cobra, Whipple ,TH-400
    Burning Corn
    9.97 - 135.5

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