gears
Thread Starter
Melting Slicks
Joined: Sep 2007
Posts: 2,145
Likes: 283
From: cary Il
gears
what gears would be a better fit ,373 or 390 on a 02 z with cai and a tune, 372 at the rear wheels, the car runs low 12s and would like to get in the mid to high 11s, also would LT headers work better instead of a lower gear, thanks
AMP Racing
Joined: Aug 2006
Posts: 10,754
Likes: 588
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
With seat time and practice, you should be able to get into the 11s as it is. Provided you have a good tire on it.
That said, 4.10s are a great choice. I certainly wouldn't go 3.73. Not enough difference from stock.
Don't fear the gear.
That said, 4.10s are a great choice. I certainly wouldn't go 3.73. Not enough difference from stock.
Don't fear the gear.
Melting Slicks
Joined: Aug 2006
Posts: 2,205
Likes: 2
From: port monmouth nj
4.10 stick shifters and 3.73 automatics seem to work the best gears
AMP Racing
Joined: Aug 2006
Posts: 10,754
Likes: 588
From: Washington TWP NJ
2023 C5 of the Year Finalist - Modified
2017 C5 of Year Finalist
St. Jude Donor '09-'10-'11-'12
Gears do nothing for your HP level - other than reduce it a bit.
Headers will give you more power - with a proper tune, but you will not likely get as much of a "seat in the pants" feel from them.
Do both - but which one first? If it were me, I'd do gears.
Headers will give you more power - with a proper tune, but you will not likely get as much of a "seat in the pants" feel from them.
Do both - but which one first? If it were me, I'd do gears.
Pro
Joined: Mar 2007
Posts: 507
Likes: 5
From: Macungie Pa
How much 1st gear do you want ??
With the M12 trans you won't have much. A track car or chasing a time slip, I agree, 4.10s are a part of alot of combos. I have em now but will change to 3.90s the next shop visit. I drive more street miles than track and traction became a huge problem in all the lower gears once 4.10s were introduced. I can't really say how I'll feel about the 3.90s but I'll let you know.
With the M12 trans you won't have much. A track car or chasing a time slip, I agree, 4.10s are a part of alot of combos. I have em now but will change to 3.90s the next shop visit. I drive more street miles than track and traction became a huge problem in all the lower gears once 4.10s were introduced. I can't really say how I'll feel about the 3.90s but I'll let you know.
Le Mans Master
Joined: Nov 2005
Posts: 7,057
Likes: 363
From: Kendall Park NJ
with these guys. They have a good handle on it. 
