what gears would you go with?
Thread Starter
Burning Brakes
Joined: May 2010
Posts: 815
Likes: 0
From: scottsborro al
what gears would you go with?
my car is auto with 3.15s 2800 ptc converter, long tubes , borla exhaust, cam, and tune on a set of bfg gforce drag radials . Took it to the track last night and it runs good out of the hole just seems to lose its power mid track looking for a gear swap what gear do you recommend, i drive this car fairly often,
time was
1.588 60'
5.042 330'
7.318 594'
7.831 1/8
87.87 mph
time was
1.588 60'
5.042 330'
7.318 594'
7.831 1/8
87.87 mph
Safety Car
Joined: Oct 2007
Posts: 3,903
Likes: 1
From: You know your drunk when you swerve to miss the tree then you realize its your air freshener! Covington Ga
You will get a nice little kick from 3.42's. If you want more go up to 3.73 or 3.90. Going from 3.15 to 3.73/3.90 will be a very big change.
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Safety Car
Joined: Jul 2005
Posts: 4,205
Likes: 2
From: Chicago-NW Burbs Illinois
. You won't be dissapointed.
Safety Car
Joined: Apr 2000
Posts: 4,326
Likes: 140
From: Weatherford, TX
Try some online gear calculators, to find out what your cruise RPM will be (like 60mph = 2000rpm), also check your MPH at redline (like 140mph - 6500rpm). This will give an idea what you're getting into. Here's some examples using 26" tire. These are round numbers, but gives you and idea of the operating range you'll get.
.7 trans ratio (A4 OD)
3.42 2000=64mph
3.73 2000=59mph
4.10 2000=53mph
.56 trans ratio (manual 6th gear)
3.42 2000=80mph
3.73 2000=74mph
4.10 2000=67mph
1:1 gear (auto 3rd or manual 4th)
3.42 6500rpm=147mph
3.73 6500rpm=134mph
4.10 6500rpm=122mph
.7 trans ratio (A4 OD)
3.42 2000=64mph
3.73 2000=59mph
4.10 2000=53mph
.56 trans ratio (manual 6th gear)
3.42 2000=80mph
3.73 2000=74mph
4.10 2000=67mph
1:1 gear (auto 3rd or manual 4th)
3.42 6500rpm=147mph
3.73 6500rpm=134mph
4.10 6500rpm=122mph
Last edited by Chris Stewart; Aug 23, 2010 at 12:32 AM.
Pro
Joined: Sep 2007
Posts: 547
Likes: 2
From: Clinton Twp. Michigan
Think long and hard
You have an automatic! So I would only listen to people who tell you they have. a std auto, std. 6 spd, Z06 auto, or Z06 6 spd. Each rear end ratio will give you different results since the trans gear ratios are different. Next thing is the amount of rwhp they have. The more hp you have the less gear you will want. I had an 01 coupe 346 cu. in. with 309 rwhp and a 3.42 and I didn't have enough gear. Next I had 347 rwhp and a 4.10 gear. Too much gear in my opinion. Ate up the tires and I couldn't finish a left turn in 1st gear without hitting the rev limiter @ 6700, or banging a shift to 2nd. Shifting on a turn can get a little hairy, but fun. Put a 3.90 in it and its perfict. Now I have 437 rwhp and I think the 3.90 is still the best gear for my setup. When I SC it I don't think the 3.90 will work.
You have a std auto so in my opinion a 3.42 or maybe??? a 3.73 is about as high as I would go. Ride with someone, or look at ECS's site. They have a really nice chart with speed vs trans vs rpm vs gear ratio.
Hope my 2 cents helps you make the correct choice for you. Remember correct info leads to correct choices.
Oh ya the 4.10 was a lot of funnnn! Had to replace tires and road in 6th at 50mph.
You have a std auto so in my opinion a 3.42 or maybe??? a 3.73 is about as high as I would go. Ride with someone, or look at ECS's site. They have a really nice chart with speed vs trans vs rpm vs gear ratio.
Hope my 2 cents helps you make the correct choice for you. Remember correct info leads to correct choices.Oh ya the 4.10 was a lot of funnnn! Had to replace tires and road in 6th at 50mph.
