Supercharged 3.42 or 3.73
Thread Starter
Instructor
Joined: Dec 2007
Posts: 197
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From: Gretna Louisiana
Supercharged 3.42 or 3.73
Looks like my DTE rear is done. Would 3.42 be better than 3.73? Here's my set up. 03 C5, Vortech SC, 484 hp, 410 tq, full exhaust, cam, A4 with 3500 stall. Currently running 3.73 and traction is none existant with 295 35 18's. Will be getting DR's 305 35 18. Looking for better traction and to get the best ET possible while still able to drive on the highway. Not a daily driver.
Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,170
From: Dyer, IN
Looks like my DTE rear is done. Would 3.42 be better than 3.73? Here's my set up. 03 C5, Vortech SC, 484 hp, 410 tq, full exhaust, cam, A4 with 3500 stall. Currently running 3.73 and traction is none existant with 295 35 18's. Will be getting DR's 305 35 18. Looking for better traction and to get the best ET possible while still able to drive on the highway. Not a daily driver.
Thread Starter
Instructor
Joined: Dec 2007
Posts: 197
Likes: 0
From: Gretna Louisiana
Le Mans Master
Joined: Feb 2004
Posts: 8,629
Likes: 16
From: York PA
There is a formula of choosing gear ratio. I don't know what it is 
You will need to know the weight of car, HP/tq, tire diameter for the right gear running 6200 to 6500? rpm thu the traps. I'm guessing with your power the 3:73 would do the job. But if you add more HP later the 3:73's might run out of gear before the traps. You should ask DTE or RPM about this.
You will need to know the weight of car, HP/tq, tire diameter for the right gear running 6200 to 6500? rpm thu the traps. I'm guessing with your power the 3:73 would do the job. But if you add more HP later the 3:73's might run out of gear before the traps. You should ask DTE or RPM about this.
Tech Contributor
Joined: Jan 2007
Posts: 19,470
Likes: 1,170
From: Dyer, IN
, still ran a 12.5. I'm going through the traps at 120-122, so she has more potential, I'm the only thing holding her back. I have M/T 315/30/18's.
Pro
Joined: Mar 2007
Posts: 600
Likes: 11
From: Wilmington NC
I run a N/A head and cam vette at 460 RWHP with 3.73 DTE rear and Yank SS3200. Runs great! Save money and keep your 3.73. I would only go to a 3.42 if you had over 600 RWHP. I pull 120.5 MPH in the 1/4 with 295 BFG street tires.
Drifting
Joined: Apr 2000
Posts: 1,390
Likes: 36
From: INDIANA
Looks like my DTE rear is done. Would 3.42 be better than 3.73? Here's my set up. 03 C5, Vortech SC, 484 hp, 410 tq, full exhaust, cam, A4 with 3500 stall. Currently running 3.73 and traction is none existant with 295 35 18's. Will be getting DR's 305 35 18. Looking for better traction and to get the best ET possible while still able to drive on the highway. Not a daily driver.
Team Owner
Joined: Mar 2005
Posts: 32,269
Likes: 35
From: Somewhere between mild insanity and complete psychosis
I regret the 3:42 gears.
Leave a lot to be desired on the freeway, and no traction even with these before the converter is locked up, so it's not like steeper gears would be any worse.
I wish I went more aggressive. But my setup is on a stock motor with 7psi. Maybe If I had more power the 3:42 would be perfect.
I'd stick with what you have for now, and only swap if it ever becomes a necessity because you want to run the 1/4 mile and have too much power and the 3.73 are causing you to have to shift to 4th before the traps.
Leave a lot to be desired on the freeway, and no traction even with these before the converter is locked up, so it's not like steeper gears would be any worse.
I wish I went more aggressive. But my setup is on a stock motor with 7psi. Maybe If I had more power the 3:42 would be perfect.
I'd stick with what you have for now, and only swap if it ever becomes a necessity because you want to run the 1/4 mile and have too much power and the 3.73 are causing you to have to shift to 4th before the traps.
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Thread Starter
Instructor
Joined: Dec 2007
Posts: 197
Likes: 0
From: Gretna Louisiana
Thats the problem I have with the 3.73. No first gear and very little second with an FLP stage 4. The rear end is shot and gonna need to make my mind up soon. I'm leaning toward 3.42. Any more input to convince me one way or the other? Also, if I switch to 3.42, the computer will need to be reprogramed, correct?
Team Owner
Joined: Jan 2006
Posts: 20,800
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From: Tellico Village, Tn
St. Jude Donor '08
