Results 1 to 7 of 7

Max Possible Top Speed

This is a discussion on Max Possible Top Speed within the General Help forums, part of the LSx Technical Help Section category; Does anyone know how to do the math on this. If you have a stock 02 F-body with an A4 ...

  1. #1
    Member
    Join Date
    May 2008
    Location
    New Brunswick
    Posts
    326

    Max Possible Top Speed

    Does anyone know how to do the math on this. If you have a stock 02 F-body with an A4 and 3.23 rear end, what is the maximum possible top speed you could achieve (assuming you had enough horsepower) with a 6800RPM limit in 4th gear?

    Second question, has anyone ever pinned 4th in an A4 with stock gears and what kind of power would be required to do it?

  2. #2
    Awaiting Activation
    Join Date
    Oct 2007
    Location
    NC
    Posts
    635

    SOM
    1998 T.A.

    Yep I pinned mine and the gps said 161 when the limiter cut off fuel. Did 174.6 with H/C/I and boltons and the GF told me to back out....... It was 4:30am and I was scared Sh!tless a deer was going step out in the road. I am done on wide open runs unless I do an organized event like the Maxton Mile or another ECTA event....

    EDIT: 161 was lid and CB only so basically stock.

  3. #3
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    Start by measuring your tire diameter. Ours is 25.6 inches, so I will use that for this example:

    For every 3.23 turns of the driveshaft your tire will make one full revolution. Engine revolutions to driveshaft revolutions depends upon transmission gearing. Assuming overdrive is 0.70:1 (engine rpm : trans rpm), running the engine at 6,800 rpm means that the transmission is turning the driveshaft at approximately 9,700 rpm. There is going to be some converter slip, etc... so this is a close approximation.

    With 9,700 rpm at the pinion, the wheels are turning 3,003 full revolutions per minute. Your tire circumference is the distance the tire travels in one revolution. Assuming a stock tire diameter of 25.6", the circumference is equal to the diameter times pi. This yields a circumference of 80.425" being 3.14159 x 25.6". Converting the circumference to feet (divide by 12) equals 6.702 feet per revolution.

    6.702 feet per tire revolution times 3,003 revolutions per minute equals 20,126.1 feet per minute. There are 5,280 feet in a mile, so the car is traveling 3.8117 miles per minute. Multiply this by 60 and you get 228 miles per hour at 6,800 rpm.

  4. #4
    Carless blkSS98's Avatar
    Join Date
    Jan 2008
    Location
    Eastsound, WA
    Age
    37
    Posts
    410
    Holy Shit!!! HAHA!!!
    I can't imagine a 4th gen going 230mph

  5. #5
    Member lrader99's Avatar
    Join Date
    Nov 2005
    Location
    NW Georgia
    Age
    32
    Posts
    397

    flat black
    this is theoretical it does not take into account for CD coefficient of drag which compounds exponentially with speed. basically you have to take your speed then figure out your surface area and CD and a bunch of other crap and it will give you a realistic number. i know personally i had my car clocked at 187, but it was way modified and slammed on the ground plus i had my own wing on the back for aero stability. Also the Factory gauges get very inaccurate above 100, there is a +/- correction factor that is built into the computer. the faster you go the less accurate the sensor gets

  6. #6
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    I agree -- the formula does not take into account drag or anything else. It would be "top speed in a perfect world".

  7. #7
    Senior Member redbird555's Avatar
    Join Date
    Mar 2009
    Location
    pompano beach florida
    Age
    27
    Posts
    1,008
    2002 Camaro Z/28 Pewter

    The drag has a huge impact on the top speed for example the bugatti veyron take oly 350hp to reach 150 mph it takes another 651hp to get it to 253 mph.

Thread Information

Users Browsing this Thread

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

Similar Threads

  1. Land Speed Racers - High-Speed Bombers
    By Ed Blown Vert in forum Almost Anything Goes
    Replies: 0
    Last Post: 11-16-2010, 06:20 PM
  2. lt16 speed compared to an ls1 6 speed
    By NOmulletLs7 in forum Manual Transmission
    Replies: 3
    Last Post: 08-07-2009, 01:26 PM
  3. Dodge Hemi Speed Demon - The Speed Demons
    By Ed Blown Vert in forum Almost Anything Goes
    Replies: 0
    Last Post: 10-10-2008, 09:30 PM
  4. 6 speed 1st geat speed
    By leod123 in forum Firebird / WS6
    Replies: 47
    Last Post: 10-17-2007, 01:41 PM
  5. 17 psi srt4 5 speed vs 6 speed 99' trans am
    By via sin dios in forum Kill Stories
    Replies: 21
    Last Post: 05-26-2007, 04:05 PM

Bookmarks

Posting Permissions

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