another new guy
Nice ride. Ask away.
Mopar Lover
Joined: Oct 2007
Posts: 1,127
Likes: 2
From: queensland Australia
g'day vorsy , i went from 3.55 to 3.9 and lost 2mph & 2 tenths over the 1/4 mile . with no other change . but it was a bit warmer & humidity was up the s@#t . if it's not a all out drag car 3.7 or 3.5 might be a bit better on the street . thats my 2 cents worth .
Mopar Lover
Joined: Apr 2009
Posts: 1,892
Likes: 4
From: Michigan: The First Line of Defense From The Canadians!
I never claimed to be an Einstien, but on the track, I thought the rear gear #'s were sized to make sure you were near the end of your powerband, in final gear when you cross the line. I mean you dont want to be still accelerating much then, you want to have used up almost everything you have by the line. If you hit third, or fourth in a stick, and you are just passin 4k when you trip the lights, then you are WRONG! From what I read, you want to shift just as every powerband starts to fall off in that gear, and trip the lights just as the powerband starts to fall off in your final gear.
Last edited by scotts74birds; Oct 16, 2009 at 07:37 PM.
Mopar Lover
Joined: Jul 2008
Posts: 6,204
Likes: 4
From: Brooklyn, N.Y.
I never claimed to be an Einstien, but on the track, I thought the rear gear #'s were sized to make sure you were near the end of your powerband, in final gear when you cross the line. I mean you dont want to be still accelerating much then, you want to have used up almost everything you have by the line. If you hit third, or fourth in a stick, and you are just passin 4k when you trip the lights, then you are WRONG! From what I read, you want to shift just as every powerband starts to fall off in that gear, and trip the lights just as the powerband starts to fall off in your final gear.
by the time you finish the race, to get the best possible time, you should be at redline in your final gear
Mopar Lover
Joined: Oct 2007
Posts: 1,127
Likes: 2
From: queensland Australia
I never claimed to be an Einstien, but on the track, I thought the rear gear #'s were sized to make sure you were near the end of your powerband, in final gear when you cross the line. I mean you dont want to be still accelerating much then, you want to have used up almost everything you have by the line. If you hit third, or fourth in a stick, and you are just passin 4k when you trip the lights, then you are WRONG! From what I read, you want to shift just as every powerband starts to fall off in that gear, and trip the lights just as the powerband starts to fall off in your final gear.
my 3.9 is a 8 3/4 30 spline , detroit locker & big brake drums , crossing the line @ about 5000 rpm . i'm thinking the extra weight is taxing more power so that with the worse weather as well that might explain the loss of et & loss of 2 mph . i didn't have time 2 explain this last time .
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