4.10 and/or 3.90 gears....
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4.10 and/or 3.90 gears....
I'm debating on doing rear gears since I'm mostly drag racing anyway. What are some exxperiences or gains some of you had or know from switching gears? Which is better 4.10 or 3.90? How much E/T and mph will I gain?
This is with a mild heads and cam setup making 430rwhp 390 rwtq.
Thanks.
This is with a mild heads and cam setup making 430rwhp 390 rwtq.
Thanks.
Burning Brakes
Joined: Mar 2006
Posts: 1,015
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From: Loxahatchee Florida
I have a stock engine but STS TT at 6lbs. I had 3:42's and went to 4:10's recently. I don't drag race so I can't help you with that just my impression. 4:10's are crazy. Whole different car and now I have to get used to it all over again. Might have to run drag radials because it is so completely traction impaired.
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I have a stock engine but STS TT at 6lbs. I had 3:42's and went to 4:10's recently. I don't drag race so I can't help you with that just my impression. 4:10's are crazy. Whole different car and now I have to get used to it all over again. Might have to run drag radials because it is so completely traction impaired.
Anyone have any before and after track results?
Burning Brakes
Joined: Feb 2012
Posts: 1,047
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From: Longview Texas
We have an '04 coupe and when we did the gear change (went with a 3.90) we also put a Yank SS4000 in too. The engine was stock (didn't even have headers) and we picked up a full second in the 1/4 changing from the 3.42. So basically gears and converter was worth a second for us.
If I had to do it again I'd go with 4.10s. If you primarily drag race you may want to do the same.
Scott
If I had to do it again I'd go with 4.10s. If you primarily drag race you may want to do the same.
Scott
Drifting
Joined: Oct 2003
Posts: 1,932
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From: Warrenville Il
From what I've seen in the past, most guys with C5Z06's go with the 3.90's while Base C5's will go with 4.10's due to the differences in transmissions between the base and Z06 models. However if your car is being used primarily as a drag car than I would think the 4.10's are what you will be happier with.
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We have an '04 coupe and when we did the gear change (went with a 3.90) we also put a Yank SS4000 in too. The engine was stock (didn't even have headers) and we picked up a full second in the 1/4 changing from the 3.42. So basically gears and converter was worth a second for us.
If I had to do it again I'd go with 4.10s. If you primarily drag race you may want to do the same.
Scott
If I had to do it again I'd go with 4.10s. If you primarily drag race you may want to do the same.
Scott
4.10s is what i'm leaning towards right now. I do some roll racing, but would like to be as fast as I can be in the 1/4 mile too. I would say 1/4 mile is my primary use and roll racing secondary.
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From what I've seen in the past, most guys with C5Z06's go with the 3.90's while Base C5's will go with 4.10's due to the differences in transmissions between the base and Z06 models. However if your car is being used primarily as a drag car than I would think the 4.10's are what you will be happier with.
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As for tire size, I run 305/35 nitto drag radials at all times, and will get hoosiars on different wheels for the track if I have to for traction. The Nittos are 26 inch tall, I believe.
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From: Fort Worth, Texas
Drifting
Joined: Sep 2009
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From: cinnaminson n.j.
St. Jude Donor '14
My shift point is 6800 rpm. As for the trap speed, I dont know what mph i'll be at, but i'm sure it won't hit the rev limiter before I cross the finish line. I'm guessing mid 120s somewhere.
As for tire size, I run 305/35 nitto drag radials at all times, and will get hoosiars on different wheels for the track if I have to for traction. The Nittos are 26 inch tall, I believe.
As for tire size, I run 305/35 nitto drag radials at all times, and will get hoosiars on different wheels for the track if I have to for traction. The Nittos are 26 inch tall, I believe.
http://www.ringpinion.com/calculators/calc_rpm.aspx
I would try several to be sure.
Drifting
Joined: Feb 2008
Posts: 1,596
Likes: 67
From: Bahama North Carolina
I'm debating on doing rear gears since I'm mostly drag racing anyway. What are some exxperiences or gains some of you had or know from switching gears? Which is better 4.10 or 3.90? How much E/T and mph will I gain?
This is with a mild heads and cam setup making 430rwhp 390 rwtq.
Thanks.
This is with a mild heads and cam setup making 430rwhp 390 rwtq.
Thanks.
Burning Brakes
Joined: Feb 2012
Posts: 1,047
Likes: 43
From: Longview Texas
Scott
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From: Rio Rancho NM
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Thread Starter
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I'm staying with a 26 inch tall tire. If I have to, I can rev it a little farther if I have to crossing the finish line, but I highly doubt that'll be necessary.