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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Decided to fit a M3 diff



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      11-14-2009, 12:30 AM   #23
stressdoc
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0-60 in a MT with procede & no shift lag would be under 4 secs with these ratios if you could get traction. Ditto for 1/4 mile with traps >115. Little harder for the 120mph+ crowd though, they would have to shift into 5th.
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      11-14-2009, 01:11 AM   #24
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Quote:
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0-60 in a MT with procede & no shift lag would be under 4 secs with these ratios if you could get traction. Ditto for 1/4 mile with traps >115. Little harder for the 120mph+ crowd though, they would have to shift into 5th.
Yep and the 6AT is geared really well for the 400+ RWHP 335i's that are runnings 11's and traping over 118 MPH. 6000RPM = 113 MPH, 6250RPM = 118 MPH and 6500RPM = 123MPH.

And once people start trapping over 125MPH the 6MT will really shine 6000RPM = 122 MPH, 6250RPM = 127 MPH, 6500RPM = 132 MPH

5500RPM - 6500RPM seems to be the sweet spot in the RPM range.
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      11-14-2009, 05:43 AM   #25
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Impressive...this is a really nice post
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      11-14-2009, 07:16 AM   #26
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Impressive...this is a really nice post
I remember you mentioning that with the shorter ratio you could not get the traction down. I had the same problems with the M3 diff but what I did is a tuned in a far less aggressive boost map, stepping it up very gradually and it seems to have done the trick in terms of traction.
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      11-14-2009, 12:20 PM   #27
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what is the M3 AT Final Drive ratio?

Do you think the M3 MT final drive will be too short for a 335i MT?
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      11-14-2009, 03:10 PM   #28
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Georgie, you a goddam Greek hero ese! Well done to you & the master. This is a great breakthough. I rate find the diff from an M-DCT & swap ring & pinions. The M-DCT has a 3.15 final drive if I remember correctly.
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      11-14-2009, 03:14 PM   #29
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what is the M3 AT Final Drive ratio?

Do you think the M3 MT final drive will be too short for a 335i MT?
It is (at 3.84), but if you use the LSD from the M3 DCT, it has a 3.15:1 final drive, which differs very little from the 3.08 of the stock 335i 6MT.
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      11-14-2009, 03:15 PM   #30
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maybe now more people can experience one of the best upgrades you can do for our cars

nice find
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      11-14-2009, 03:37 PM   #31
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Georgie, you a goddam Greek hero ese! Well done to you & the master. This is a great breakthough. I rate find the diff from an M-DCT & swap ring & pinions. The M-DCT has a 3.15 final drive if I remember correctly.
I reckon the DCT is the one to go for. I am just waiting for them to become available on the used markets. A lot of guys are planning to go shorter with the DCT's which will make the parts available. The other option is to hang onto this diff, when much bigger turbo conversions become readily available I can just launch in second and the rest of the gears are perfect.
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      11-14-2009, 03:53 PM   #32
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      11-14-2009, 05:45 PM   #33
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difficult to find a DCF diff for the moment
Is the ring bolted to the diff for both DCT and 6MT?
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      11-14-2009, 09:18 PM   #34
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GeorgeSmith, it would be great if you could describe what extra engineering work is needed for the swap. What exactly must be done to the driveshaft ? Is there no adaptation needed for the sideshafts ? A bit more detail would be great...
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      11-14-2009, 09:21 PM   #35
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What happened to the Quailfe ?, planning on buying one but seems to need a very good mechanic to mount it properly otherwise it brakes...
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      11-15-2009, 04:38 PM   #36
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What happened to the Quailfe ?, planning on buying one but seems to need a very good mechanic to mount it properly otherwise it brakes...

The Quaife itself is in perfect condition. For some unknown reason the ring and pinion are worn. The company that fitted it either used the wrong oil or did something wrong. I have zero experience with differentials unlike motors etc so it is hard for me to know. I will be sending it for a opinion to a trustworthy company.

cstavaru, the engineering work that was required was the shortening of the front section of the 335 driveshaft. I am not sure what the exact measurements where.
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      11-15-2009, 06:31 PM   #37
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Thanks for the info, must be sure to find a company that has experience in mounting the LSD.
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      11-15-2009, 08:04 PM   #38
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When you chop the drive shaft you have to rebalance it, which is not a job for your local corner Eurotuner garage. Brett (KMS) would be the way to go short of the dedicated BMW race shops.
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      11-16-2009, 12:31 AM   #39
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      11-16-2009, 04:12 AM   #40
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could you simply assemble half shaft from M3 with the rest of 335i?
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      11-16-2009, 04:41 AM   #41
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Quote:
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could you simply assemble half shaft from M3 with the rest of 335i?
Yes they bolt together. I used a shaft from a E92 as the E90 shaft that came with the diff was damaged. I also know that the manual 335 driveshaft is slightly longer than the auto so it will require more cutting.

Everyone must please understand that I am giving this information as my personal opinion and should not go out and buy the components based on what I say. You should research things for yourself prior to financially committing.
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      11-16-2009, 05:26 AM   #42
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Yes I am analysing it based on the shaft length of different models.

Could you only confirm thet the junction point between the two half shafts fit together?
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      11-16-2009, 08:52 AM   #43
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first picture the M3 shaft, second the 335i one will they join correctly?
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      11-16-2009, 08:59 AM   #44
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Quote:
Originally Posted by GeorgeSmooth View Post
The Quaife itself is in perfect condition. For some unknown reason the ring and pinion are worn. The company that fitted it either used the wrong oil or did something wrong. I have zero experience with differentials unlike motors etc so it is hard for me to know. I will be sending it for a opinion to a trustworthy company.

cstavaru, the engineering work that was required was the shortening of the front section of the 335 driveshaft. I am not sure what the exact measurements where.
im not sure if this applies to your diff, but i tried installing a quaife lsd in a customers car, it got it to go in but the way it was build and not able to shim the bmw diff, it had the ring gear way to tight against the pinion gear so there was zero backlash, needless to say i would not leave it in, i pulled it back out and put the stock back in
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