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      07-12-2012, 05:34 PM   #1
f32458
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how do I improve torque?

Currently my only performance mod is iPE F1 exhaust. I am changing the X pipe to another iPE X pipe which claimed to have more torque. I drive my M3 95% on stop and go heavy city traffic. Anyway I am heading to the track soon. I have my 18" TE37 SL with Hoosier R6 ready. I am still on stock suspension. I know usually people who run slicks they lower their rides. Will this be a problem?

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      07-12-2012, 05:42 PM   #2
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while not improving actual #s; for the biggest bang for buck and feel I would say rear gears
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      07-12-2012, 05:57 PM   #3
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Quote:
Originally Posted by talontid View Post
while not improving actual #s; for the biggest bang for buck and feel I would say rear gears
could you be more specific?
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      07-12-2012, 06:08 PM   #4
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Dinan differential. Take a look at their site.
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      07-12-2012, 06:16 PM   #5
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Since you have a DCT, the 3.62 Limited Slip Differential from Dinan would be suitable for your M3.

Almost 15% increase in torque! However, top end speed may fall a little.
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      07-12-2012, 06:27 PM   #6
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Buy a supercharger ....
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      07-12-2012, 06:44 PM   #7
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Buy a supercharger ....
Yeah, that definitely should do the trick!
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      07-12-2012, 07:03 PM   #8
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It certainly does.
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      07-12-2012, 07:25 PM   #9
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Buy a 335i

Joking aside..these cars are all about HP and that means correct gear selection..there is no way around that..you cant just lug it in a high gear and expect to take off like other torque laden cars
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      07-12-2012, 08:06 PM   #10
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I'd like to see a modded 335 run with a ESS 625 dct....come on boys!
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      07-12-2012, 08:32 PM   #11
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A modded 335i like the Vishnu single turbo. A good race.
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      07-13-2012, 03:10 AM   #12
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Quote:
Originally Posted by pbonsalb View Post
A modded 335i like the Vishnu single turbo. A good race.
im pretty sure the 335 would win
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      07-13-2012, 10:17 PM   #13
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Buy a 4.6 stroker
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      07-13-2012, 10:36 PM   #14
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I agree that this 4.0L V8 is not designed for strong low end torque. You really want more displacement or twin turbos or a positive displacement supercharger, none of which are reasonable cost items for these cars to the extent they exist. Another car with strong low end torque would be the best choice.
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      07-13-2012, 10:42 PM   #15
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I find the 3.45 to fit the car perfectly. As long as I'm in the right gear, feel like I have a fighting chance against some of the big boys on track (I always lose though ) great for city driving as in gear acceleration increases and you never use the full rev range in town (at least I don't ) and on the highway ( have over 35k on my 2011) not too busy at all as I'm around 3500 at 80... Good luck, but I love this mod
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      07-14-2012, 03:02 AM   #16
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Quote:
Originally Posted by SehrSchnell
I run the 4:10 gears with a 600 kit... solved the torque issue right away.
Had 4:10s in my old supercharged car(s). Took them out as went to a
3:73. That tall of gearing is useless in the first two gears. Also, that gearing doesn't increase torque, only multiples the feeling of it in the first three gears.
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      07-14-2012, 10:21 AM   #17
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S/C if you can afford it.
Otherwise, I say a differential from Dinan would do the trick
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      07-14-2012, 11:23 AM   #18
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Proceed, exhaust and meth got me
to 295ft tq and 400whp.

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      07-14-2012, 11:41 AM   #19
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Quote:
Originally Posted by Stealth ///M View Post
Had 4:10s in my old supercharged car(s). Took them out as went to a
3:73. That tall of gearing is useless in the first two gears. Also, that gearing doesn't increase torque, only multiples the feeling of it in the first three gears.
Going from a 3.85 to a 4.10 in an E9X M3 is very different from going from a 3.62 to a 4.10 in an E46 M3 or a 3.23 to a 3.64 in an E36 M3. It is only about a 5% difference and will not make the first two gears useless. BMW selected the 3.85 as a good compromise between efficiency and performance for the average driver -- it was a compromise.

A differential change will affect the multiplication of torque in all six gears on the 6MT, not just the first three gears. It is true that the additional multiplication offered by the transmission ratios ceases once you reach the 1:1 ratio, but that does not happen until 5th gear on the E9X M3 with 6 speed manual. The overall multiplication obviously does diminish as you go through the gears, but you will feel a diff change in 4th, 5th and 6th.
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      07-14-2012, 12:58 PM   #20
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Quote:
Originally Posted by Stealth ///M View Post
Had 4:10s in my old supercharged car(s). Took them out as went to a
3:73. That tall of gearing is useless in the first two gears. Also, that gearing doesn't increase torque, only multiples the feeling of it in the first three gears.
It doesnt increase torque at the flywheel, but it does increase torque at the wheels which is more important.
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      07-14-2012, 01:52 PM   #21
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Quote:
Originally Posted by pbonsalb
Going from a 3.85 to a 4.10 in an E9X M3 is very different from going from a 3.62 to a 4.10 in an E46 M3 or a 3.23 to a 3.64 in an E36 M3. It is only about a 5% difference and will not make the first two gears useless. BMW selected the 3.85 as a good compromise between efficiency and performance for the average driver -- it was a compromise.

A differential change will affect the multiplication of torque in all six gears on the 6MT, not just the first three gears. It is true that the additional multiplication offered by the transmission ratios ceases once you reach the 1:1 ratio, but that does not happen until 5th gear on the E9X M3 with 6 speed manual. The overall multiplication obviously does diminish as you go through the gears, but you will feel a diff change in 4th, 5th and 6th.
Isn't the 1:1 gearing reached in 4th gear...?

Hence why we dyno the car is 4th..
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      07-14-2012, 03:27 PM   #22
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Figures listed are for the 6MT model

Quote:
Originally Posted by Stealth ///M View Post
Isn't the 1:1 gearing reached in 4th gear...?

Hence why we dyno the car is 4th..
4.06 - 1st gear
2.40 - 2nd gear
1.58 - 3rd gear
1.19 - 4th gear
1.00 - 5th gear
0.87 - 6th gear
3.68 - Reverse
3.85 - Final drive

The difference in readings between 4th and 5th gears would be marginal at best on a dyno. I can only assume safety comes into play hence the reason we dyno in 4th gear.
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