3.46 vs 3.08 in 6MT

Ingeniator · 08-14-2014, 11:19 AM

Looking to get an MFactory LSD to tide me over so I'll be able to do some of my turbo work. So the question. Who has done the 3.46 swap into a 6MT car. I think I saw some things around that it isn't worth it to do the swap for performance. I think 1st and 2nd are pretty short as it is. Anyway MFactory has 3.46 cores in so it will take less time just trying to get some pro's and con's. I know gearing so more looking for personal or secondhand experience vs theoretical gearing discussion.

Icewall · 08-14-2014, 11:51 AM

Mine in 3.46 comes monday. Wont have it in till next weekend, so i wont know until then.

135Pats · 08-14-2014, 11:54 AM

You will tire of it unless it's basically a dedicated track/race car. That's just IMO.

jbertino · 08-14-2014, 11:59 AM

Quote:

Originally Posted by Icewall

Mine in 3.46 comes monday. Wont have it in till next weekend, so i wont know until then.

No one cares

Ingeniator · 08-14-2014, 12:01 PM

Quote:

Originally Posted by 135Pats

You will tire of it unless it's basically a dedicated track/race car. That's just IMO.

Yeah not only is it dedicated track car it willjust be temporary. I'm swapping in a 9" once the cage is built. Changing up the build order a bit because of the motiv kit.

Allen@MOTIV · 08-14-2014, 12:08 PM

We run a 3.46 OS GIKEN in the track car. Works really well with our setup.

MFactory · 08-14-2014, 12:12 PM

Just so you know, switching up the ratio will give you a 12% increase in torque throughout the whole rev range, in every gear. This is at a sacrifice of top speed in each gear though.

If fuel consumption is of worry, unless your car is mainly driven on the freeway only, you will actually get better mpg due to less throttle required to move the car, especially if you do a lot of traffic light driving. RPM is only 1 of many variables involved in fuel consumption.

RWD, so traction issues can easily be sorted by better/different tires, different chassis setup etc etc

Obi Wong Kenobi will be posting up his review on the 3.46 with MFactory Helical LSD shortly.

'___' · 08-14-2014, 12:40 PM

Quote:

Originally Posted by Allen@PTF

We run a 3.46 OS GIKEN in the track car. Works really well with our setup.

Allen-

I'd love to see acceleration differences by gear between the two gear sets if you guys have info on that.

MFactory · 08-14-2014, 12:53 PM

3.46 MFactory Helical LSD review here: http://www.1addicts.com/forums/showthread.php?t=1023285

turb0mik3 · 08-14-2014, 02:06 PM

Love my Wavetrac 3.46 and have beaten on it for 3 years straight without an issue. You travel through gears relatively quickly, but I have never reached my top speed on a road course so I really don't care. If it was a daily driver and saw no track time I would not bother with the 3.46. You will also find that you get less mpg because 80mph in 6th is at like 3100rpm (if I remember correctly) vs. sub 2800rpm.

08-14-2014, 11:19 AM	#1
Ingeniator Major 34 Rep 1,093 Posts Drives: 07 335XI(90) 09 135I(82) Join Date: Nov 2013 Location: Fort Mac, Alberta iTrader: (1)	3.46 vs 3.08 in 6MT Looking to get an MFactory LSD to tide me over so I'll be able to do some of my turbo work. So the question. Who has done the 3.46 swap into a 6MT car. I think I saw some things around that it isn't worth it to do the swap for performance. I think 1st and 2nd are pretty short as it is. Anyway MFactory has 3.46 cores in so it will take less time just trying to get some pro's and con's. I know gearing so more looking for personal or secondhand experience vs theoretical gearing discussion. __________________ 07 335XI (A008006) 6AT ~94K miles JB4 G5 ISO VSRF DP's 09 135I M (VK80379) 6MT. Race Project car. 1) Install Cobb/piggyback? and Motiv 600 Kit[HTA3076R w/ tial .82] 2) JRZ or Moton suspension. 3) Build high flow intake manifold with multi-port fuel and relocate OFH 4) Build full cage 5) Complete staged twin setup with HTA4205R [w/Tial 1.16] 6) Complete dry sump system
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08-14-2014, 11:51 AM	#2
Icewall Private 1 Rep 90 Posts Drives: black 135i Join Date: Jul 2013 Location: Clark, nj iTrader: (0)	Mine in 3.46 comes monday. Wont have it in till next weekend, so i wont know until then.
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08-14-2014, 11:54 AM	#3
135Pats Major General 461 Rep 6,478 Posts Drives: A few BMWs Join Date: May 2012 Location: Maryland iTrader: (3)	You will tire of it unless it's basically a dedicated track/race car. That's just IMO. __________________ E88 N54 Alpinweiss/Coral Red/Motiv HTA 3586r Tial .82AR/Other stuff...652WHP F30 N55 XDrive EBII
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08-14-2014, 12:08 PM	#6
Allen@MOTIV 38 Rep 634 Posts Drives: 135i Join Date: Jun 2013 Location: VA iTrader: (0)	We run a 3.46 OS GIKEN in the track car. Works really well with our setup.
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08-14-2014, 12:12 PM	#7
MFactory Major 667 Rep 1,469 Posts Drives: E92 M3 Join Date: Feb 2014 Location: San Dimas, CA iTrader: (2)	Just so you know, switching up the ratio will give you a 12% increase in torque throughout the whole rev range, in every gear. This is at a sacrifice of top speed in each gear though. If fuel consumption is of worry, unless your car is mainly driven on the freeway only, you will actually get better mpg due to less throttle required to move the car, especially if you do a lot of traffic light driving. RPM is only 1 of many variables involved in fuel consumption. RWD, so traction issues can easily be sorted by better/different tires, different chassis setup etc etc Obi Wong Kenobi will be posting up his review on the 3.46 with MFactory Helical LSD shortly. __________________ - Specialists in Automotive Carbon Composite Technologies. Website: www.ctecarbon.com Official Partners: MFactory Competition Products, Porsche Cup Experience, Ferrari S.p.A, BYD Auto, Honda Racing Corporation, Three Five (555) Motorsport
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08-14-2014, 12:53 PM	#9
MFactory Major 667 Rep 1,469 Posts Drives: E92 M3 Join Date: Feb 2014 Location: San Dimas, CA iTrader: (2)	3.46 MFactory Helical LSD review here: http://www.1addicts.com/forums/showthread.php?t=1023285 __________________ - Specialists in Automotive Carbon Composite Technologies. Website: www.ctecarbon.com Official Partners: MFactory Competition Products, Porsche Cup Experience, Ferrari S.p.A, BYD Auto, Honda Racing Corporation, Three Five (555) Motorsport
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08-14-2014, 02:06 PM	#10
turb0mik3 247 Rep 2,781 Posts Drives: E90 335i Racecar Join Date: Jan 2010 Location: San Diego, CA iTrader: (1) Garage List 2010 BMW 335i [8.90]	Love my Wavetrac 3.46 and have beaten on it for 3 years straight without an issue. You travel through gears relatively quickly, but I have never reached my top speed on a road course so I really don't care. If it was a daily driver and saw no track time I would not bother with the 3.46. You will also find that you get less mpg because 80mph in 6th is at like 3100rpm (if I remember correctly) vs. sub 2800rpm. __________________ HG Motorsports \| Motiv Motorsport \| Sparta Evolution \| BBS Motorsports \| Sabelt \| JRZ \| NASA ST1 SoCal --- 554whp/487wtrq --- 3200lbs <<YouTube Channel w/ Race Videos>>
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