3.90 Gears
Team Owner
Joined: Jul 2004
Posts: 24,652
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From: NJ
St. Jude Donor '05-'08
Originally Posted by Scatterbrained
Interesting thread. I'm still in the planning stages, most likely looking for 400 rwhp/rwtq. My question is will the 3.90's be enough ('98 M6), or would the 4.10's be a better all around gear with that amount of power. Or isn't there enough difference between the two to notice? This car is a fun daily driver, very limited track and strip. Wondering what you guys think....
S
S
limited road course then I would go with 4.10s. I had 450 rwhp with 4.10s and just loved them. The only reason I changed was because I do mostly road courses (15 or so a year now) and the 4.10s just required too much work.
Racer
Joined: Oct 2003
Posts: 377
Likes: 2
From: Palm Beach Gardens FL
I am planning to go 3:90’s by DTE. I am not sure if stage 2 is enough or go to stage 3. I am running about 400HP and 380 ft/lbs. I don’t drag race but I do get on it when I can. Any recommendations 
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
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From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Originally Posted by voda1
What mph is 6000rpm in 4th gear with 3.90 gear?
Stock tyre size = 275/40/18
A4 gears :
1st 3.06
2nd 1.63
3rd 1.00
4th 0.70
I don't know what the MN6/MN12 gear ratios are but 1:1 is the same no matter what
Race Director
Joined: Dec 2000
Posts: 19,304
Likes: 85
From: San Diego CA
Originally Posted by EnglandGreen
And this is wrong why? 
Another interersting tidbit: One of the car mags pitted an 06 Z06 against a bunch of tuner cars. The average tuner car had well in excess of 600 HP. Some had nearly 1000 HP. Guess what? The Z06 with its lowly 505 HP beat miost of them in 0-60 and 1/4-mile times. Why? No traction! Even with huge tires, the 800 HP cars were all over the place. It might be fun on the highway when you're already rolling at a good clip, but stoplight sprints require a super-gentle touch - kinda like using the throttle of a superbike - you get the idea.
The reason I bring this up is that you CAN take gears too far. If you are planning to pump up your engine beyond 500 HP, the low gears may get old really quickly. 350-450 HP might be the best range to stay within, IMO.
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
Likes: 39
From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Originally Posted by Dave68
I recall a Viper guy joining one of our mountain cruises a couple of years ago. Whenever he hit the gas, his car almost went sideways. He seemed to fall back at times because of all the tire spinning. Was it fun for him? Probably, but it sure didn't help him get the most out of his car.
Another interersting tidbit: One of the car mags pitted an 06 Z06 against a bunch of tuner cars. The average tuner car had well in excess of 600 HP. Some had nearly 1000 HP. Guess what? The Z06 with its lowly 505 HP beat miost of them in 0-60 and 1/4-mile times. Why? No traction! Even with huge tires, the 800 HP cars were all over the place. It might be fun on the highway when you're already rolling at a good clip, but stoplight sprints require a super-gentle touch - kinda like using the throttle of a superbike - you get the idea.
The reason I bring this up is that you CAN take gears too far. If you are planning to pump up your engine beyond 500 HP, the low gears may get old really quickly. 350-450 HP might be the best range to stay within, IMO.
Another interersting tidbit: One of the car mags pitted an 06 Z06 against a bunch of tuner cars. The average tuner car had well in excess of 600 HP. Some had nearly 1000 HP. Guess what? The Z06 with its lowly 505 HP beat miost of them in 0-60 and 1/4-mile times. Why? No traction! Even with huge tires, the 800 HP cars were all over the place. It might be fun on the highway when you're already rolling at a good clip, but stoplight sprints require a super-gentle touch - kinda like using the throttle of a superbike - you get the idea.
The reason I bring this up is that you CAN take gears too far. If you are planning to pump up your engine beyond 500 HP, the low gears may get old really quickly. 350-450 HP might be the best range to stay within, IMO.
I was north of 600rwhp with 3.90 gears and loved it. Soon I'll be north of 800rwhp - and I'm keeping the 3.90 gears.
It all depends on what you want. But hey! many people like stock.
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Team Owner
Joined: Feb 2001
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Cruise-In II Veteran
St. Jude Donor '03-'04-'05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19
Here's a good indicator of what 4.10's will do for you.....watch how fast the car raps out with 4.10's on a 100 shot....and yes, that is 4th gear! 
http://nelsonresidence.com/vehicles/...OSdynoRun2.wmv
http://nelsonresidence.com/vehicles/...OSdynoRun2.wmv
Race Director
Joined: Dec 2000
Posts: 19,304
Likes: 85
From: San Diego CA
Originally Posted by EnglandGreen
I disagree. Traction is just a matter of money. Re: Tuner car shootout - Michelin tyres are not sticky at all.
I was north of 600rwhp with 3.90 gears and loved it. Soon I'll be north of 800rwhp - and I'm keeping the 3.90 gears.
It all depends on what you want. But hey! many people like stock.
I was north of 600rwhp with 3.90 gears and loved it. Soon I'll be north of 800rwhp - and I'm keeping the 3.90 gears.
It all depends on what you want. But hey! many people like stock.
If you drive ONLY on dry roads, then having super-sticky-replace-em-every-10000-miles tires will prevent tire spinning, but don't get caught in a rainstorm with 410s, and drag radials. I have no doubt that you can find a way to avoid rainy days and can afford to replace your super sticky tires every year - that's great. It's just that not everyone here makes the mega-bucks that you do!
Racer
Joined: Nov 2002
Posts: 289
Likes: 0
Originally Posted by Wicked Weasel
Just as an FYI - Before you make your gear decision make sure you plan out your long term goals for your car and figure out what type of driving you like to do. In the long run you will save money.
I currently have 3.73 gears in my car. I did start with 3.42s and decided that I wanted 4.10s as a replacement because I was doing more 1/4 mile stuff and my car only had a cat-back and air intake. As my power increased, g5x3 cam and afr heads, the 4.10s were still good for 1/4 mile stuff, but on the open road I had to watch my shifts. I did love them though.
My interest then changed to road racing and it only took me a few days at the track to realize the 4.10s were not good. I then had to go back and change to 3.73s to give me more range on the track.
I am not stating that you shouldn't change your gears because as you can see I changed mine twice, but if you think about the type of driving you plan on doing and your future rwhp/rwtq you will make a better decision.
I currently have 3.73 gears in my car. I did start with 3.42s and decided that I wanted 4.10s as a replacement because I was doing more 1/4 mile stuff and my car only had a cat-back and air intake. As my power increased, g5x3 cam and afr heads, the 4.10s were still good for 1/4 mile stuff, but on the open road I had to watch my shifts. I did love them though.
My interest then changed to road racing and it only took me a few days at the track to realize the 4.10s were not good. I then had to go back and change to 3.73s to give me more range on the track.
I am not stating that you shouldn't change your gears because as you can see I changed mine twice, but if you think about the type of driving you plan on doing and your future rwhp/rwtq you will make a better decision.
I have an MN6 'Vert w/ 420rwhp / 390 rwtq and recently installed an RPS Synergy clutch & flywheel and 3.90. I put 400 mi. on them and am now planning to go back to 3.42 for the type of driving I'm doing and future plans for a big inch N/A engine.
I will soon have a 400 mi. 3.90 w/ fresh GM synthetic gear oil and limited slip additive For Sale. It was purchased from Andy @ A&A. If anyone is interested, please PM me and we'll discuss a price.
Safety Car
Joined: Sep 2000
Posts: 3,604
Likes: 395
From: Austin, TX
I installed DTE 3.90's on my car a while back. This is one of the best mods I've done to date. For me the car is geared how it should have been from the factory. RPMs at various speeds are perfect. I made the right decision to not go for the 4.10's as this is my daily driver.
Safety Car
Joined: Jul 2001
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From: Ocean Springs MS
Originally Posted by EnglandGreen
And this is wrong why?
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
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From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Originally Posted by Dave68
I think it's safe to say you don't represent the average CF member. If you drive ONLY on dry roads, then having super-sticky-replace-em-every-10000-miles tires will prevent tire spinning, but don't get caught in a rainstorm with 410s, and drag radials.
I have no doubt that you can find a way to avoid rainy days and can afford to replace your super sticky tires every year - that's great. It's just that not everyone here makes the mega-bucks that you do!
If you drive ONLY on dry roads, then having super-sticky-replace-em-every-10000-miles tires will prevent tire spinning, but don't get caught in a rainstorm with 410s, and drag radials. I have no doubt that you can find a way to avoid rainy days and can afford to replace your super sticky tires every year - that's great. It's just that not everyone here makes the mega-bucks that you do!
Supporting Tuner
Joined: Sep 2004
Posts: 51,896
Likes: 39
From: ================== Houston, Texas www.englandgreen.com ================== Necessary Evil™ __________
CI 6-7-8-9-10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14
Originally Posted by fdxpilot
Yeah, for you, it's OK; But we all know your demented, not to mention the bottomless bag of money you have to cover mods, tires, and new engines.
----snake bitten----
Joined: Apr 2005
Posts: 852
Likes: 0
From: midland tx
Originally Posted by Dave68
I think it's safe to say you don't represent the average CF member. If you drive ONLY on dry roads, then having super-sticky-replace-em-every-10000-miles tires will prevent tire spinning, but don't get caught in a rainstorm with 410s, and drag radials.
I have no doubt that you can find a way to avoid rainy days and can afford to replace your super sticky tires every year - that's great. It's just that not everyone here makes the mega-bucks that you do!
If you drive ONLY on dry roads, then having super-sticky-replace-em-every-10000-miles tires will prevent tire spinning, but don't get caught in a rainstorm with 410s, and drag radials. I have no doubt that you can find a way to avoid rainy days and can afford to replace your super sticky tires every year - that's great. It's just that not everyone here makes the mega-bucks that you do!
)!!! you pay to play and thats not a problem for most of the vette guys i know, including myself.
Team Owner
Joined: Apr 2001
Posts: 54,204
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From: S.W. Ohio. . . . . . NRA Life Member
Originally Posted by fdxpilot
But we all know your demented, not to mention the bottomless bag of money you have to cover mods, tires, and new engines.
"going EG extreme"
Race Director
Joined: Dec 2000
Posts: 19,304
Likes: 85
From: San Diego CA
Originally Posted by wannabe-psi
all the vette guys i know are mod heads(its a sickness )!!!
you pay to play and thats not a problem for most of the vette guys i know, including myself.
)!!! you pay to play and thats not a problem for most of the vette guys i know, including myself.