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      01-22-2013, 10:11 AM   #1
09BMW335i
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LSD Question

I am about to order a LSD from Turner MS for aeound 1800 ish and have a few questions for the board.



I have 2 options 3.08 or the 3.46 Is it worth the $500 More to go to the 3.46 gear. Do you really improve you times and is the acceleration that much more noticable?

With the 3.46 gear what are you at RPM wise at crusing speed say 80-85 MPH in 6 Gear?

how much is your topspeed with 3.46 really taken away?

Polishing of the ring gears to remove high spots is it worth it?

what are some other brands that other would recomeend instead of Turner and why?


Thanks
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      01-22-2013, 11:28 AM   #2
N111CUK
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I'm currently installing a complete M3 rear subframe which has loads of benefits

Ratios depends and your existing tranny is it MT or AT

Suspension and chassis is also vital hence the advantage of the M3 rear end

Search and you'll find some great info about this
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      01-22-2013, 11:30 AM   #3
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At 80-85mph you will be close to 3500rpm...it reminds me of driving a e36 m3 always wishing that it had a 6th gear. I went back to my 3.08.
It's very close to a 1000rpm difference all throughout the rpm range.
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      01-22-2013, 11:33 AM   #4
09BMW335i
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i have a 6MT
i also planned at the same time changing out bushing swaybars ect.
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      01-22-2013, 12:46 PM   #5
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1800 is a lot to for a LSD, unless prices have gone up in the last 6 months look for a better deal. I went through my local dealer SonicMS..
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      01-22-2013, 12:58 PM   #6
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I would look into the M3 rear subframe swap

Why?

Well by buying a good M3 subframe from a salvage yard you will automatically be upgrading the following in one hit

1, M3 LSD which is clutch type and IMHO better
2, All the M3 rear suspension components and their bushings
3, M3 Sway bar and bushing
4, M3 subframe bushing
6, Uprated rear brakes (you will need to upgrade your front brakes to balance the bias)
7, stronger axles to cope with power over 500hp
8, stronger prop shaft to cope with more power torque etc...

Shopping list

1 Complete M3 rear subframe with everything still bolted on
2 Complete M3 prop shaft both halves
3 If you are keeping your 335i hubs and disks then you need adjustable camber arms

I will be doing this transplant next week and the current steps to archive this will be as follows

Drop 335i subframe
Install M3 subframe
Customise the M3 prop with the trans side of the 335i prop measure cut weild and balance with a prop shaft company

My spend so far which is £

Subframe and prop £400 from a 2010 M3 DCT
Cut wield and balance prop £135
Labour 1 day £500

Total £1035 about $1650

Now that's a bargain

If you have a manual then you will need to find an M3 DCT diff which is 3.15 final drive which means gearing a slightly shorter but not by much.

Hope this gives you some more thoughts
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