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05-11-2009, 11:22 PM | #1 |
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how would a 4.10 FD affect 1/4 mile times?
i have a e92 m3 and im just wondering how a 4.10 FD would affect 1/4 performance. dinan says its like a 6% increase but would it hurt or improve 1/4 mile times?
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05-12-2009, 06:17 AM | #2 |
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I think it would help as long as you can get through the 1/4 mile without an extra shift. I'm going for this mod soon. It's not a drastic change but it should be a nice one. What I like about it is that it is a 6% increase in torque over the entire RPM band with no questions. Not like some of the engine mods that only improve at high RPM and are still questionable due to their testing strategies.
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05-12-2009, 06:27 AM | #3 |
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I'm thinking it would improve times if it's a DCT. How much does a new FD cost?
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05-12-2009, 09:54 AM | #6 |
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At least as far as MPH go, a E92 M3 with a 4.10 and OEM 18" wheels and tires will just hit 100mph at the top of 3rd, and be pushing 135ish at the top of 4th.
A shorter final drive will always help with overall acceleration, and the nice thing about the 4.10 is that you still run out of gear at about 180mph- more than most M3 owners will ever need.
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05-12-2009, 10:03 AM | #7 |
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I think the 4.10 gears would be a good mod. The M3 GT4 is running them from the factory, btw.
As far as 1/4 mile gains, who knows. Probably a modest gain since it's not a big jump. The toughest part would be maintaining traction in 1st gear since that can already be a challenge with the stock gears. Last edited by FStop7; 05-13-2009 at 09:48 AM.. |
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05-12-2009, 11:05 AM | #9 |
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A shorter final drive like a 4.10 would make getting traction more difficult, as power at the ground would be improved. Technically a taller ratio like a 3.43 would improve traction, but only by hurting overall acceleration.
I personally don't follow the logic of getting taller gears to improve traction. Turbo guys do this in the US all the time. What good is having a high horsepower car if you're going to diminish acceleration by running a numerically lower gear ratio?
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05-12-2009, 11:10 AM | #10 |
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The problem I find with a higher gear is once you lose traction and start spinning the wheels and the faster they are spinning the less chance you have at regaining traction. So the lower gear will actually slow the acceleration of the wheel down, yet increase torque at the same time.
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05-12-2009, 11:18 AM | #11 |
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A 3plate diff with variable ramps (30/90) will help in this. I have it because it was installed by DiffOnline when they did my 3.62, should work great with the 4.10 MT. It really is almost night and day difference between the stock diff. Although, I do drive without traction control most of the time.
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05-12-2009, 11:25 AM | #12 |
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If you can get the car to hook up 4.10's could be worth .25 sec in the 1/4mile with 1-2mph gain in trap speed.
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05-12-2009, 11:27 AM | #13 | |
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Dave
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05-12-2009, 01:15 PM | #14 | |
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actually i have a set of DR that im running on some stock 18's. so hooking up shouldnt be a problem, i just didnt wanna add another shift in the 1/4, because that would hurt my times. so since i should be in 4th at the end of the 1/4, the 4.10 should only improve my times since im not adding another shift. 4.10 it is. im gonna do it |
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05-12-2009, 09:14 PM | #15 | |
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05-12-2009, 11:39 PM | #16 | |
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05-13-2009, 03:29 AM | #17 |
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3rd Gear with the stock FD maxes out around 107MPH, given the better traps are generally around 110MPH+, I'd say the 4.10 FD won't make any negative impact on a good run and should in theory be slightly faster assuming you can manage the extra torque to the wheels in 1st gear...
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05-13-2009, 06:20 AM | #18 | |
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05-13-2009, 09:04 AM | #19 |
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05-13-2009, 09:18 AM | #20 |
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05-13-2009, 09:46 AM | #21 |
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05-13-2009, 09:49 AM | #22 |
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Yes I know that hence the slower spinning wheels
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