Page 1 of 2 12 LastLast
Results 1 to 10 of 13

Thread: will it go faster or slower?

  1. #1

    will it go faster or slower?

    took the car out for the first time last week and was impressed with the new engine set up. 1/8 mile it it ran 5.51 @126 at 7000 rpm. engine is 565 bbc that dynoed 1011 peak at 7200 thru 7400. max torque 795 at about 6200. car weighs 2910 with driver and has glide with 1.80 first. the rear i have now is a 4.88 with a 33" tire. i feel that when i quarter the car it might run high in the rpms. i have a new 3rd member that is 4.56 and wondering if that gear will slow the 1/8 time down or will it improve? the converter locks at aprx 6000 rpm and 2nd gear shift point is 7000.

  2. #2
    Senior Member DYNO OPERATOR
    Join Date
    Mar 2007
    Location
    Texas
    Posts
    525
    JMO slower ET but more MPH.
    Wesley
    60' 1.30
    5.58 @ 127.89

  3. #3
    Go to Pages 2 and 3 of my site and insert the weight, gearing, shift speed, etc. into the spreadsheets. Play with the rear wheel horsepower number until you get your eighth mile speed. (The ET will probably not match very well, but don't worry about that. It's difficult to closely calculate ET.) Then, you can change rear gear and see what happens in the quarter.

  4. #4
    Junior Member APPRENTICE
    Join Date
    Jul 2005
    Posts
    12

    faster vs slower

    I have had a very similiar setup in the past, but went from a 4.88 gear to a 4.10 and my 60' and 1/8th both got better, I guess it was spinning the tires off of the line anyways goodluck

  5. #5
    i'll be takeing it out this thursday and find out how she does. just hope the air is close to the last time. i'll let ya know

  6. #6
    did'nt seam to change much. it went a 5.54 and back to back 5.53's at 125mph. the air was up apr. five hundred feet from the first time out. the best the first time out was 5.51 and a couple of 5.52's. i'll have to wait till the 17-18th of nov for the psca to run the quarter.

  7. #7
    Senior Member DYNO OPERATOR
    Join Date
    Mar 2007
    Location
    Texas
    Posts
    525
    Let us know what happens.
    Wesley
    60' 1.30
    5.58 @ 127.89

  8. #8
    Senior Member RACING JUNKIE jmarksdragster's Avatar
    Join Date
    Jul 2007
    Location
    Florida
    Posts
    635
    If you ran the same on the 1/8th, why change it? It won't run slower on the 1/4.

  9. #9
    Member JUNIOR BUILDER
    Join Date
    Sep 2005
    Location
    East Texas
    Posts
    86
    How much lower was your RPMs at the traps?

  10. #10
    in the 1/8th it appeared to have went from 7000 to 6900. i just got back fromcalifornia speedway psca yesterday and got in two practices. went 8.68 at 156 and 8.68 at 156 right at 7500rpm. now maybe you gus can help a little and try to figure converter slip? glide with 180 first 4.56 rear and 33" tire. the 1/8 time was 5.55 at 125. also with the new motor set up it is torqueing to the right off the line. it looks like a upper right four bar can be preloaded a little to help correct this. what do i do for the pre load, shorten the bar or lengthen it a half flat. it is in a neautral spot now. thanks fot the help


Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Email us - Support@RacingJunk.com
Call us - 866.326.9227
Copyright © 2005-2016 RacingJunk.com All Rights Reserved.

Designated trademarks and brands are the property of their respective owners. Use of this Web site constitutes acceptance of the RacingJunk.com
Terms of Use, Classifieds Disclaimer, Privacy Policy, and Cookie Policy