): Why do they say to leave the car in 3rd while taking them down the 1/4 mile? Why is o/d not used? 
A4 at the Track Question
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Joined: Sep 2006
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From: MI
that is mainly so it doesn't shift to 4th. but some testing has shown, that you actually get more line pressure in OD(4th), and IIRC, the overrun clutches are not engaged all the time, or something like that. turns out, that you want to put it in OD, and just ajust the shift rpm if you need to. That keep it in 3rd gear is left over from the 700r4.
11 Second Club
Joined: Oct 2005
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From: Sandwich, IL
You can race in 3 or OD, either is fine. I have tried both and don't get any better ET's with one or the other so I just leave mine in 3 (no particular reason other then it's one shift position up from 2 where I do my burnouts).
On The Tree
Joined: Aug 2006
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Originally Posted by charlie c5
Call any tranny builder in the world and they will all tell you that the computer can and will shift better then you can. So leave it in OD.
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Originally Posted by bjamick
i only raced mine in the 1/8 and put it in 2nd so i would finish in 2nd and it wouldn't go 2 third. bc if i left in OD then it would have shifted losing time..
Originally Posted by Dan
Never understood why assclowns manually shift an A4 
..tune the car & it will shift where you want it without doing it manually
..tune the car & it will shift where you want it without doing it manuallythe only time I might manually shift my a4 is if Im on the street and I want to hold 1st or 2nd for a little longer at a lower TPS so it wont shift on me. Othterwise I put it in OD and let er rip
Originally Posted by Ls1CamaroGuy87
i usually use 3rd for races and the strip...I mean in a stock A4 car you barely hit 3rd in the 1/4...I hit third at the finish line
11 Second Club
Joined: Oct 2005
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From: Sandwich, IL
Originally Posted by BlackHawk T/A
With what gears? I'm in 3rd somewhere around 85mph. The 1/4 doesn't end until ~110.
TECH Regular
Joined: Sep 2006
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From: MI
heres a test for some of you guys, do a blast in D, then start over and do a blast in @. When I did that in the caddy, i swore @ felt firmer, on the 1-2, and 2-3 shifts. I'll see if I can find the thread on the @ higher pressure.
Nope, seams ISSF has lost it.
When I took my caddy to the strip, with 29" tires and 2.93's it had JUST finished the shift to 3rd at the traps.
Nope, seams ISSF has lost it.
When I took my caddy to the strip, with 29" tires and 2.93's it had JUST finished the shift to 3rd at the traps.
TECH Resident
Joined: May 2006
Posts: 969
Likes: 119
With the lever in the "D" (3rd) position, the overrun clutches will come on when the transmission shifts into 3rd gear. This will rob some of the apply oil going to the 3-4 clutch pack. In "OD" (4th) this does not happen. Not "all" 4L60E's are going to be hurt by leaving them in "D" position, but why take the risk when racing, the 3-4 clutch pack needs all the help it can get. Driving around town in "D" or "OD" is a personal preference.