Gears and Forced Induction....
Thread Starter
Drifting
Joined: Apr 2001
Posts: 1,337
Likes: 52
From: Wentzville, MO.
Gears and Forced Induction....
I plan on keeping my 99 6spd for a longtime... In the short run, I want to get in on the DTE rear gear special.... in the long run I hope to add forced induction... ATI on Magnuson...
I'd like some feedback on gear ratio selection.... I want some bang for my buck but I don't want gears that will be a poor fit with forced induction... Will I get a kick out of 3.73s alone, will 3.90s be my best balance, are 4.10s to much??? I've read traction is a major issue with the stock 3.42s! :confused:
I'd like some feedback on gear ratio selection.... I want some bang for my buck but I don't want gears that will be a poor fit with forced induction... Will I get a kick out of 3.73s alone, will 3.90s be my best balance, are 4.10s to much??? I've read traction is a major issue with the stock 3.42s! :confused:
Supporting Vendor
Joined: Jul 2003
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From: http://www.mphparts.com 800-364-1975
Re: Gears and Forced Induction.... (99SilverC5Coupe)
Might want to ask this question in the FI forum. I think most will agree that if you're looking for street performance and you're going FI, to keep the 3.42s or maybe 3.73's... 4.10's appear to be generally regarded as overkill on a street FI setup.
Le Mans Master
Joined: Aug 2000
Posts: 5,294
Likes: 2
From: Suffolk, Long Island NY
Re: Gears and Forced Induction.... (diynoob)
Might want to ask this question in the FI forum. I think most will agree that if you're looking for street performance and you're going FI, to keep the 3.42s or maybe 3.73's... 4.10's appear to be generally regarded as overkill on a street FI setup.
Melting Slicks
Joined: Sep 2003
Posts: 2,458
Likes: 105
From: Northville Michigan
Re: Gears and Forced Induction.... (99SilverC5Coupe)
Luther,
I have 4.10 gears in my Z06, with the same 2.66 first gear 6-speed that you have in your Coupe. The 4.10 gear set gives you 19.8% more torque at the rear wheels in each gear, when compared to the stock 3.42:1 gear set.
Without forced induction I am able to smoke the tires with throttle tip-in anywhere under 35 mph.
The 4.10 does make your car extremely quick through 4th gear, where it tops out at 119 mph @ 6,500 rpm. Fifth gear tops out at 161 mph, and sixth gear hits 200 mph at 5,360 rpms if you have enough horsepower.
My plan is to also add a Vortech supercharger to my C5 in the future. When I do I plan on staying with the 4.10s.
Good Luck with your decision.
[Modified by Pumba, 6:11 PM 1/8/2004]
I have 4.10 gears in my Z06, with the same 2.66 first gear 6-speed that you have in your Coupe. The 4.10 gear set gives you 19.8% more torque at the rear wheels in each gear, when compared to the stock 3.42:1 gear set.
Without forced induction I am able to smoke the tires with throttle tip-in anywhere under 35 mph.
The 4.10 does make your car extremely quick through 4th gear, where it tops out at 119 mph @ 6,500 rpm. Fifth gear tops out at 161 mph, and sixth gear hits 200 mph at 5,360 rpms if you have enough horsepower.
My plan is to also add a Vortech supercharger to my C5 in the future. When I do I plan on staying with the 4.10s.
Good Luck with your decision.
[Modified by Pumba, 6:11 PM 1/8/2004]
Drifting
Joined: Dec 2002
Posts: 1,361
Likes: 0
From: Forest Hill MD
Re: Gears and Forced Induction.... (99SilverC5Coupe)
I have MN6 with ATI and 3.90's and love the set-up. Never used six gear before getting gear change, now 2000 rpm's in six gear is right on 80 mph. With anything over 450rwhp forget about worrying about traction in lower gears anyway. You'll have some but not much.
Melting Slicks
Joined: Oct 2002
Posts: 2,855
Likes: 0
Re: Gears and Forced Induction.... (supercoupe01)
:iagree: I have the same setup with 390s and I think it drives better in all regards and 6th gear deff becomes usefull, at one time I was thinking of building the bottom and turning up the boost and I felt 390s would let me make the quarter without a 5th gear shift since I expected to run in the mid to upper 130's.
Melting Slicks
Joined: Dec 2001
Posts: 2,765
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From: Dana Point Ca
Re: Gears and Forced Induction.... (Pumba)
Pumba,
Gears our my next mod and I was going to go with 3:90's because I was told with the z's different transmission compared to the coupe, the 4:10's would be to much. Sounds like your happy with yours :flag
Didnt mean to hijack the thread! :crazy:
Gears our my next mod and I was going to go with 3:90's because I was told with the z's different transmission compared to the coupe, the 4:10's would be to much. Sounds like your happy with yours :flag
Didnt mean to hijack the thread! :crazy:
Le Mans Master
Joined: Jul 2002
Posts: 7,370
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From: Slave to the evil empire
Cruise-In V Veteran
St. Jude Donor '04
Re: Gears and Forced Induction.... (99SilverC5Coupe)
The most important question is which supercharger do you really want, the peak torque numbers for an ATI come on later in the RPM band and 3.90 or 4.10's work well (depending on other mods of course), I have a Magnuson and I'm in the process of installing 3.73's. The peak torque for a Magnuson S/C is as soon as you step on it and I've been warned that 3.73's may be to much.
:reddevil we'll see :reddevil
:reddevil we'll see :reddevil
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Team Owner
Joined: May 2000
Posts: 25,343
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From: Frisco, TX
Re: Gears and Forced Induction.... (runamuk)
The most important question is which supercharger do you really want, the peak torque numbers for an ATI come on later in the RPM band and 3.90 or 4.10's work well (depending on other mods of course), I have a Magnuson and I'm in the process of installing 3.73's. The peak torque for a Magnuson S/C is as soon as you step on it and I've been warned that 3.73's may be to much. :reddevil we'll see :reddevil
I can't really say with the ATI, but in all events I think I wouldn't go any higher than 3.90s.
Racer
Joined: Nov 2002
Posts: 360
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From: Newport Beach CA
Re: Gears and Forced Induction.... (99SilverC5Coupe)
I have 4.10's ATI with 10psi and heads and cam. I love my 4.10's. I would never go with any other gear. It's nice to be able to blow off the tires at will in any of the first 3 or 4 gears, but when you learn to squeeze the throttle (still learning) you can manage to hook up and motivate like a mo' F---er. It makes alot more sense in the upper gears in lower RPM'd which is where you are alot of the time if it's a driver. just my .02