Selecting a rear-end ratio, advice please
Thread Starter
Safety Car
Joined: Aug 2004
Posts: 4,734
Likes: 232
From: Youngstown Ohio
Selecting a rear-end ratio, advice please
Ok, so i would like to make some quarter mile runs this year, ran once, and I am looking at changing my rear-end to get the most out of my car.
What I have;
2004 coupe with a six speed, 3.42 rear-end
Haltech Stinger
Borla stinger cat-back
No other engine mods or power adders at this time.
Will be adding long tube headers and an X pipe with highflow cats
Considering switching over to a Honker intake
Tune
So keeping that in mind what would be the best ratio considering the setup I will have? I am not looking to do a cam/heads package and F/I is also out.
One last thing. Ran the car once and didn't have to shift out of fourth to clear the quarter mile. If I go with 4.10s will the gearing be so short that I have to shift to fifth to clear the quarter, which will slow me down a bit, extra shift? If this is the case can I compensate by raising the redline? How much can you raise the redline safely on a stock long block without causing valvetrain problems?
Thanks very much in advance for the information,
Darion
What I have;
2004 coupe with a six speed, 3.42 rear-end
Haltech Stinger
Borla stinger cat-back
No other engine mods or power adders at this time.
Will be adding long tube headers and an X pipe with highflow cats
Considering switching over to a Honker intake
Tune
So keeping that in mind what would be the best ratio considering the setup I will have? I am not looking to do a cam/heads package and F/I is also out.
One last thing. Ran the car once and didn't have to shift out of fourth to clear the quarter mile. If I go with 4.10s will the gearing be so short that I have to shift to fifth to clear the quarter, which will slow me down a bit, extra shift? If this is the case can I compensate by raising the redline? How much can you raise the redline safely on a stock long block without causing valvetrain problems?
Thanks very much in advance for the information,
Darion
Racer
Joined: Sep 2005
Posts: 383
Likes: 0
From: Michigan
Originally Posted by Darion
Ok, so i would like to make some quarter mile runs this year, ran once, and I am looking at changing my rear-end to get the most out of my car.
What I have;
2004 coupe with a six speed, 3.42 rear-end
Haltech Stinger
Borla stinger cat-back
No other engine mods or power adders at this time.
Will be adding long tube headers and an X pipe with highflow cats
Considering switching over to a Honker intake
Tune
So keeping that in mind what would be the best ratio considering the setup I will have? I am not looking to do a cam/heads package and F/I is also out.
One last thing. Ran the car once and didn't have to shift out of fourth to clear the quarter mile. If I go with 4.10s will the gearing be so short that I have to shift to fifth to clear the quarter, which will slow me down a bit, extra shift? If this is the case can I compensate by raising the redline? How much can you raise the redline safely on a stock long block without causing valvetrain problems?
Thanks very much in advance for the information,
Darion
What I have;
2004 coupe with a six speed, 3.42 rear-end
Haltech Stinger
Borla stinger cat-back
No other engine mods or power adders at this time.
Will be adding long tube headers and an X pipe with highflow cats
Considering switching over to a Honker intake
Tune
So keeping that in mind what would be the best ratio considering the setup I will have? I am not looking to do a cam/heads package and F/I is also out.
One last thing. Ran the car once and didn't have to shift out of fourth to clear the quarter mile. If I go with 4.10s will the gearing be so short that I have to shift to fifth to clear the quarter, which will slow me down a bit, extra shift? If this is the case can I compensate by raising the redline? How much can you raise the redline safely on a stock long block without causing valvetrain problems?
Thanks very much in advance for the information,
Darion
Safety Car
Joined: Aug 2003
Posts: 4,988
Likes: 16
From: Hooterville, NJ
4:10's will give you the best Et's for the most part. For the Mod's you are going to do and considering that you will not be spinning the engine to 7k I would opt for 3.90's for the best compromise.
Melting Slicks
Joined: Jul 2005
Posts: 2,060
Likes: 46
From: winter haven florida
St. Jude Donor '12
go with 3.90's or 4.10's. i am running the 3.90 in my z06 with an mn12 in it and it is great. this is for a z06 mn12 but 4th gear is the same in mn6 cars so that will tell you if you will need to shift or not. you can also plug in your mn6 gear ratios also and that will tell you everything you want to know about speed and rpms for each gear. http://www.xse.com/leres/bin/gearrat...mference=82.00
Last edited by 2000FRCZ19; Jul 17, 2006 at 01:44 PM.
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Thread Starter
Safety Car
Joined: Aug 2004
Posts: 4,734
Likes: 232
From: Youngstown Ohio
Originally Posted by 2000FRCZ19
go with 3.90's or 4.10's. i am running the 3.90 in my z06 with an mn12 in it and it is great. this is for a z06 mn12 but 4th gear is the same in mn6 cars so that will tell you if you will need to shift or not. you can also plug in your mn6 gear ratios also and that will tell you everything you want to know about speed and rpms for each gear. http://www.xse.com/leres/bin/gearrat...mference=82.00
Thanks again,
Darion
Team Owner
Joined: Mar 2006
Posts: 27,567
Likes: 99
From: San Diego
I want to do 3.90's in my A4, but since I have the 2.73's, what I've heard tells me it's too much $ and too much work to really make it worthwhile, and was told it made more sense to go 3.42's 
Safety Car
Joined: Jul 2001
Posts: 4,661
Likes: 67
From: Ocean Springs MS
Originally Posted by JustinStrife
I want to do 3.90's in my A4, but since I have the 2.73's, what I've heard tells me it's too much $ and too much work to really make it worthwhile, and was told it made more sense to go 3.42's
Of course, with 3.90s, your A4 will be at almost 2700 rpm at 70 mph, and if you run the 1/4 mile, 3rd gear will only go to 118mph, unless you up the rev-limiter. IMHO, 3.42s are the best bet for a DD A4.
