Question about gearing for 1/4
Thread Starter
Joined: Jan 2005
Posts: 1,475
Likes: 1
From: Munfordville KY
Question about gearing for 1/4 Right now I cross the traps at 6100-6200 with 3.73's. What gear would get me there at around 6700-6800? I'm looking for max et, but I don't want to go over 7-7100 rpm's due to the factory computer. Help me pick my next gear.
If you're now turning 6200 at a given speed with the 3.73's, 4.10's will have you turning 6815 at the same speed assuming you're either a M6 car or are locking up your converter if you're an A4.
Just curious, what's your power curve looking like. I'm getting ready to switch gears as well and am probably settling on 4.30's because of my engine making max power up around 6800. I'd really like 4.56's but I'm afraid I might run out of gear just before the traps. I'm scared of turning much more than 7000 RPM.
Just curious, what's your power curve looking like. I'm getting ready to switch gears as well and am probably settling on 4.30's because of my engine making max power up around 6800. I'd really like 4.56's but I'm afraid I might run out of gear just before the traps. I'm scared of turning much more than 7000 RPM.
Thread Starter
Joined: Jan 2005
Posts: 1,475
Likes: 1
From: Munfordville KY
[QUOTE=Smokinstorm]If you're now turning 6200 at a given speed with the 3.73's, 4.10's will have you turning 6815 at the same speed assuming you're either a M6 car or are locking up your converter if you're an A4.
Just curious, what's your power curve looking like. QUOTE]
I'm not sure what my power curve looks like, I've yet to get on the dyno with my new motor.
Just curious, what's your power curve looking like. QUOTE]
I'm not sure what my power curve looks like, I've yet to get on the dyno with my new motor.
Thread Starter
Joined: Jan 2005
Posts: 1,475
Likes: 1
From: Munfordville KY
Originally Posted by Dragula
7100/6200=X/3.73
X= 4.27
6800/6200=Y/3.73
Y= 4.09
I would go with 4.10 or 4.11 depending on your options.
4.10/3.73=Z/6200
Z=6815
X= 4.27
6800/6200=Y/3.73
Y= 4.09
I would go with 4.10 or 4.11 depending on your options.
4.10/3.73=Z/6200
Z=6815
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Originally Posted by matt94z
Thanks man, I have a Moser 12 bolt with a series 3 carrier. Will I have to swap to a series 4 carrier?
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here is a quick calculation
RPM / rear gear / tranny ratio(omit of 1:1) / 336 * tire size = SPEED
6700/3.89/1/336*27=138.404 MPH
or if you know you MPH you wanna hit
rear gears*tranny*speed/tire size*336=RPM
3.89*140/27*336=6777.24 RPM
hope this helps ya its how i picked my 3.89s and my 27in slicks for my 6900RPM red line
RPM / rear gear / tranny ratio(omit of 1:1) / 336 * tire size = SPEED
6700/3.89/1/336*27=138.404 MPH
or if you know you MPH you wanna hit
rear gears*tranny*speed/tire size*336=RPM
3.89*140/27*336=6777.24 RPM
hope this helps ya its how i picked my 3.89s and my 27in slicks for my 6900RPM red line
jeez, if you need to buy a carrier and everything, why not just spend that money to get another 50hp somehow. Should be around 65-6600 then, and alot faster.
An old guy told me once, if you need bigger gears, you just aint got enough motor. **** im switching to 3.08's from my 3.42's this winter
Gary
An old guy told me once, if you need bigger gears, you just aint got enough motor. **** im switching to 3.08's from my 3.42's this winter
Gary