May 15, 2018, 06:01 AM
deadon1578CHANGE REAR GEAR FOR 1/8 MILE?
Running 90% 1/8 mile everywhere I go. Any ET advantage to changing gear ratio? Door car 2250# with driver, 572 terminator on alky, 4.30 gears 33.5x16x15 3084S Mickeys, runs consistent 5.0, 1.10 60ft, 135 1/8 mile... anybody running 4;56 or even 4.88? Thanks!
May 15, 2018, 12:07 PM
1355PROYou won't notice much going to 4.56's.....I would leave it alone personally.
May 15, 2018, 12:11 PM
1320racerthe quicker you get to the 60 foot cone, the quicker you get to the finish line.
May 15, 2018, 10:10 PM
AlkyIROCA deeper gear will get you off the line quicker and with those big tires you still shouldn't overpower the tires with the increased torque.
I run 4.86 gears in my car and run 1/4 mile.
Does anyone run a 6.50 rear gear? Thoughts? Opinions?
May 17, 2018, 07:31 AM
wideopen231If not going to 1/4 mile anytime then its maybe worth change for little ET. If going to ru n some 1/4 stuff(10%) and don't want any extra rpm then I would say a lot of trouble for little gain. That said the rpm gain over 4.30 in 1/4 would not be huge IMO. Go to wallace calculator and run numbers and see if you like answers.
I know on little brothers dragster we went from 4.30 to a 4.86 gear and got very little to nothing for it. Thats 5.20 hardtail dragster.
If you are bracket racing and its consistent ,why would you change it or thats the question I have always heard.
May 17, 2018, 07:49 AM
Mike NitzscheI picked up .04-.05 by going from 4.10 to 4.57. I am currently installing 4.86 and may put 5.00 gears in later. I shift at 7800 and would like to cross at 8100 or so. I'm 2350# going 4.90's.
May 17, 2018, 08:21 PM
AlkyIROCBut changing gears can affect the way a lot of other things work.
ET calculators said my car would run better with 4.56 gears. I swapped in some 4.57 and it was a slug. Converter stall was all wrong. Went back to 4.86 and the car loved them. If I put in the 4.57 and a different stall speed converter, the car might have run quicker.
With my current combination of parts, my shift light comes on just before I cross the finish line. To me, that's running as close to perfect with how I currently run the car. If I wanted a higher or lower shift point, then other changes would have to be made to make everything work together.
I have also considered going to 5.00 gears just to get my shift point a little higher.
May 19, 2018, 05:28 AM
fuzzy diceI run 5:13's in mine...it weighs 2950...I used to run 32x14's out back but switched to Pro Bracket Radials recently...I go through the traps at 6500 rpm...
I find it easier to hit the tree for one thing...I tried 4:30's and they were awful for me...I still have them for sale if anyone is interested...4 passes on them...they fit a Dana 60...150 bucks plus the ride...