« previous next »
Pages: [1]   Go Down

Author Topic: Higher trans lower rear  (Read 2960 times)

Offline wideopen231

  • Hero Member
  • *****
  • Posts: 1911
    • View Profile
  • Your Best Time: 1/8 3.70@ 198 1/4 5.78@245
  • Your Engine: Hemi 526 ci alcohol
  • Your Track: Piedmont
  • Your Vehicle: 225 CMC FED
  • General Location: NORTH CAROLINA
Higher trans lower rear
« on: March 17, 2022, 05:39:51 AM »
Anyone running higher trans gear(lower number) and lower rear gear(higher number ? My thinking is it will ease hit at starting line tq wise while allowing for lower top end gearing to give it extra ump  to pull  last 1/4 of track. Not really concerned about top end rpm. In my case the motor use to turn 10.5k with a blower,  so a few hundred extra NA, extra being above 8000 or 8500 rpm is no biggy.  Plus 99% of runs will be 1/8 mile.

 I did have some input from ol guy in Kansas about trans gear and was told do not run 1.80 low. Yea I am not lkeaving at 9200 rpm, but figure TQ with bigger crank will make up for that.Maybe wrong. What are you running.If known weight and HP please.
Logged
Relecting obama is like shooting right foot because it did not hurt enough when you shot left foot

Offline Finnish Fireball

  • Jr. Member
  • **
  • Posts: 87
    • View Profile
  • Your Best Time: 4.69 / 147 mph 1/8 mile
  • Your Engine: 540 cid BBC 8-71 Hampton e85
  • Your Track: Kauhava
  • Your Vehicle: Fireball Slingshot
  • General Location: Finland
Re: Higher trans lower rear
« Reply #1 on: March 17, 2022, 10:28:17 PM »
Interesting topic, lets hope someone who has the knowledge jumps in with facts. I always thought this is only a matter of final starting line ratio and one can compensate.
http://www.wallaceracing.com/calc-slr.php
Logged
I'm fast. I can make five mistakes while others think.

Offline masracingtd1167

  • Hero Member
  • *****
  • Posts: 1110
  • bill masiello Shelton Ct.
    • View Profile
  • Your Best Time: 7.40's at 181 on motor 6.94 at 192 nitrous
  • Your Engine: 394 chevy
  • Your Track: Lebanon Valley Dragway
  • Your Vehicle: 2003 Neil and Parks
Re: Higher trans lower rear
« Reply #2 on: March 19, 2022, 10:00:33 AM »
Chris you want to cross about 200 rpm above peak HP ! Thats if you want to be as fast as the car can run ! Your low gear choice should not change what your rear end ratio should be ! Great to finally meet you in Gainsville ! I wish we had more time to talk but the weather put a dampner on that ! We got down to 5 cars in Top Dragster ! We lost in round 3 and the guy we raced had a .000 light and went dead on with a three ! My friend was .012 on the tree and ran 6.42 on a 6.43 still a good race !   
Logged

Offline wideopen231

  • Hero Member
  • *****
  • Posts: 1911
    • View Profile
  • Your Best Time: 1/8 3.70@ 198 1/4 5.78@245
  • Your Engine: Hemi 526 ci alcohol
  • Your Track: Piedmont
  • Your Vehicle: 225 CMC FED
  • General Location: NORTH CAROLINA
Re: Higher trans lower rear
« Reply #3 on: April 03, 2022, 07:54:36 PM »
Yea weather screwed everything up. We had a broken reverse cable and jammed up inside the outer shield.  Hopefully Charlotte will be better. Owner spending a small fortune on flowing pump and system. Cool thing is we are going down to play on the flow bench at Rage .Found out we are 300 psi instead of 400 and about 50 gpl instead of 50, reason for dropping cylinders.

You going to Charlotte?
Logged
Relecting obama is like shooting right foot because it did not hurt enough when you shot left foot
Pages: [1]   Go Up
« previous next »