A4 - How big of a RPM difference from 3.23's to 3.73's
12-30-2004 | 12:47 PM
#1
Thread Starter
Staging Lane
Joined: Oct 2004
Posts: 73
Likes: 0
A4 - How big of a RPM difference from 3.23's to 3.73's A4 - How big of a RPM difference from 3.23's to 3.73's.
thinking about doing this swap, but I might also get a TH400 where the 3.73's might make me turn tooo high of an RPM
thinking about doing this swap, but I might also get a TH400 where the 3.73's might make me turn tooo high of an RPM
12-30-2004 | 01:28 PM
#2
TECH Senior Member
Joined: Dec 2001
Posts: 5,399
Likes: 3
From: Jacksonville, FL
12-30-2004 | 01:54 PM
#3
Presuming you cruise locked, it's just the numerical ratio.
If you were turning 2500RPM at 80MPH, 3.73s will put you
to almost 2900 (in 4th).
If you want to see what a TH400 would be like, try driving
on the highway in 3rd and not locked up (like press in the
brake pedal just enough to light the lights but not enough
to drag).
If you were turning 2500RPM at 80MPH, 3.73s will put you
to almost 2900 (in 4th).
If you want to see what a TH400 would be like, try driving
on the highway in 3rd and not locked up (like press in the
brake pedal just enough to light the lights but not enough
to drag).
12-30-2004 | 04:16 PM
#5
mph X gear ratio
---------------- X 336 = RPM
tire diameter
That would be at 1-1 gear ratio (3rd in an A4), so you would have to multiply that by .7(roughly) for overdrive.
2350 for a 3.23 in overdrive at 80 mph
2700 for a 3.73 in overdrive at 80 mph
both with a 26" tall tire.
---------------- X 336 = RPM
tire diameter
That would be at 1-1 gear ratio (3rd in an A4), so you would have to multiply that by .7(roughly) for overdrive.
2350 for a 3.23 in overdrive at 80 mph
2700 for a 3.73 in overdrive at 80 mph
both with a 26" tall tire.
01-01-2005 | 10:18 PM
#6
i have 3.73's and 80mph is 3k in OD, top speed i can still get up to 140 maybe more, i have no reason to go any faster than that. My acceleration is awesome at top speed, but better than my stock 2.73's.
