3.90's or 4.10's for a Non-Race Weekend Driver with ~400 RWHP?
02-01-2012, 02:34 PM
#1
Racer
Thread Starter
3.90's or 4.10's for a Non-Race Weekend Driver with ~400 RWHP?
I have read numerous post on the subject, but most of them were either old, or a lot of the replies ran the 1/4 mile.
Are there any of you out there that went with 4.10's and use your car as the weekend driver with the occasional spirited driving?
I don't race, have no plans on racing, am going to stay NA with the goal to be around the 450-475 RWHP range.
I have new Firestone Firehawk Wideoval runflats, and will most likely keep them.
So if I had 4.10's, my questions are:
1. Will a mildly/medium aggressive launch from let's say a traffic light just spin? I'm not talking dump the clutch!
2. Is it an instantaneous shift from first to second?
I went from ordering 3.90's to 4.10's and keep second guessing myself.
Thanks!
~Joe
Are there any of you out there that went with 4.10's and use your car as the weekend driver with the occasional spirited driving?
I don't race, have no plans on racing, am going to stay NA with the goal to be around the 450-475 RWHP range.
I have new Firestone Firehawk Wideoval runflats, and will most likely keep them.
So if I had 4.10's, my questions are:
1. Will a mildly/medium aggressive launch from let's say a traffic light just spin? I'm not talking dump the clutch!
2. Is it an instantaneous shift from first to second?
I went from ordering 3.90's to 4.10's and keep second guessing myself.
Thanks!
~Joe
02-01-2012, 02:53 PM
#3
Race Director
4.10s for MN6 
I drive my ride the same way you do..street only now. Huge fun factor! 
Answers to your questions:
So if I had 4.10's, my questions are:
1. Will a mildly/medium aggressive launch from let's say a traffic light just spin? I'm not talking dump the clutch! No, as long as you lean on it with controlled throttle.
2. Is it an instantaneous shift from first to second? No
I drive my ride the same way you do..street only now. Huge fun factor! Answers to your questions:
So if I had 4.10's, my questions are:
1. Will a mildly/medium aggressive launch from let's say a traffic light just spin? I'm not talking dump the clutch! No, as long as you lean on it with controlled throttle.
2. Is it an instantaneous shift from first to second? No
Last edited by Ikester; 02-01-2012 at 03:02 PM.
02-01-2012, 03:11 PM
#4
Racer
Thread Starter
02-01-2012, 03:13 PM
#5
Racer
Thread Starter
4.10s for MN6 I drive my ride the same way you do..street only now. Huge fun factor!
Answers to your questions:
So if I had 4.10's, my questions are:
1. Will a mildly/medium aggressive launch from let's say a traffic light just spin? I'm not talking dump the clutch! No, as long as you lean on it with controlled throttle.
2. Is it an instantaneous shift from first to second? No
I drive my ride the same way you do..street only now. Huge fun factor! Answers to your questions:
So if I had 4.10's, my questions are:
1. Will a mildly/medium aggressive launch from let's say a traffic light just spin? I'm not talking dump the clutch! No, as long as you lean on it with controlled throttle.
2. Is it an instantaneous shift from first to second? No
02-01-2012, 03:19 PM
#6
Team Owner
I have 4.10's with heads/cam/headers/cutouts/Vararam on my MN6 coupe and it really woke up the setup. Tons of fun and really makes great use of the gear ratios all the way up to 6th. You'll find yourself in 4th where you previously would have used 3rd and in 5th when yould would be cruising in 4th. You will be shifting through the gears more quickly but it's not instantaneous.
02-01-2012, 05:03 PM
#8
Burning Brakes
I just installed 3.90s in my Z along with doing some head work and swapping the cam. I love it!!! I am going to have to go with a stickier tire in the summer though. The Invos just aren't doing it.
With a MN6 you should have a riot with 4.10s.
By the way, I don't drag race, but I do drive the car hard whenever I'm in it and the new gears and cam have made me fall in love with the car all over again.
With a MN6 you should have a riot with 4.10s.
By the way, I don't drag race, but I do drive the car hard whenever I'm in it and the new gears and cam have made me fall in love with the car all over again.
02-01-2012, 05:15 PM
#10
Racer
Thread Starter
I just installed 3.90s in my Z along with doing some head work and swapping the cam. I love it!!! I am going to have to go with a stickier tire in the summer though. The Invos just aren't doing it.
With a MN6 you should have a riot with 4.10s.
By the way, I don't drag race, but I do drive the car hard whenever I'm in it and the new gears and cam have made me fall in love with the car all over again.
With a MN6 you should have a riot with 4.10s.
By the way, I don't drag race, but I do drive the car hard whenever I'm in it and the new gears and cam have made me fall in love with the car all over again.
MStrahan...this is my ultimate goal! After reading 118 posts on 3.90's vs 4.10's, my head is about to explode...but am feeling much better that I picked the 4.10's for my MN6. I'm also doing a cam swap and adding a Fast 102 Intake & TB. So I'm hoping the SOTP feeling is dramatically improved. (Coming from 348 RWHP with 3.42's)
Have a good one!
02-02-2012, 04:42 AM
#12
Team Owner
My FRC had 3.90's on it when I bought it. Was my first experience with gears, and very noticeable from the stock 3.42's that were on my coupe. Combine the gears with the torque of the 402 and blower... Holy fun bags. 
I am thinking this will be my next mod...
02-02-2012, 09:31 AM
#15
Burning Brakes
MStrahan...this is my ultimate goal! After reading 118 posts on 3.90's vs 4.10's, my head is about to explode...but am feeling much better that I picked the 4.10's for my MN6. I'm also doing a cam swap and adding a Fast 102 Intake & TB. So I'm hoping the SOTP feeling is dramatically improved. (Coming from 348 RWHP with 3.42's)
Have a good one!
Have a good one!
4.10s with your transmission is the perfect fit. I talked long and hard with the shop owner who works on my car and he said that if my car wasn't a Z then he would certainly recommend 4.10s.
Changing the gears puts you in the power band so much faster than stock gears. You're going to love it.
02-02-2012, 11:19 AM
#16
Racer
Member Since: Jul 2010
Location: Jefferson City Missouri
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Would someone pass along what the engine RPM is at 70 with the 4:10 gears in 6th gear. I am accustomed to the old hotrod 4 speeds and I took the 4:10's out of mine rather than run 3000 rpm just driving down the road at highway speeds and shift out of lst at 20 mph. In the hotrod the 4:10's were great on the strip but not suited for any real road trips.
02-02-2012, 11:45 AM
#17
Team Owner
Would someone pass along what the engine RPM is at 70 with the 4:10 gears in 6th gear. I am accustomed to the old hotrod 4 speeds and I took the 4:10's out of mine rather than run 3000 rpm just driving down the road at highway speeds and shift out of lst at 20 mph. In the hotrod the 4:10's were great on the strip but not suited for any real road trips.
02-02-2012, 01:11 PM
#18
Race Director
I have 3.90s in my 97 A4 4K stall and around 500 RWHP NA
I have 4.10s in my 01 MN6 and around 520 rwhp NA
Either is a good but a set of sticky tires will be in order either way
I have 4.10s in my 01 MN6 and around 520 rwhp NA
Either is a good but a set of sticky tires will be in order either way
02-02-2012, 07:41 PM
#20
Racer
Thread Starter
Would someone pass along what the engine RPM is at 70 with the 4:10 gears in 6th gear. I am accustomed to the old hotrod 4 speeds and I took the 4:10's out of mine rather than run 3000 rpm just driving down the road at highway speeds and shift out of lst at 20 mph. In the hotrod the 4:10's were great on the strip but not suited for any real road trips.
At 70 MPH: (with a MN6 trans)
3.42's would be 1500 RPM's
3.73's would be 1650 RPM's
3.90's would be 1725 RPM's
4.10's would be 1800 RPM's (And apparently you can actually pass someone in 6th gear)
I've also read the highway fuel loss with 4.10's is approx ~2mpg