700+ hp LSD options

[Dc317]

I've lurked the forums for some time and finally pulled the trigger on making an account. I have a built e82 1M clone that's lacking lsd and strong enough axles to support the power it's making. Before winter hit (I live in the #1 snowiest city in the nation) the car put down 633whp on a mustang dyno, with about 8 more lbs of boost left. I'm looking to order a diff/axles this week before it starts getting nice out. I have a few different routes I'm considering but I'm unsure of the limitations. So, here's the situation

Primary use of the vehicle is street driving, roll racing, potentially some 1/4 digs at some point so I'm unsure of what ratio to go with for my LSD.

Option #1 M factory diff, with either m factory axles or Driveshaft shop axles. My main concern here are the limitations of the Mfactory diff and axles, as well as the factory Drive shaft.

Option #2 Ad-e Ford 8.8 IRS conversion, obviously going to hold all of the ponies. Just costs almost twice as much.

If anyone could shed some light on the ratio I should run as well as what other higher horsepower cars are running, that would be greatly appreciated!

 

[doublespaces]

Welcome to the board (officially)!

Is your car an automatic?

As far as your other requests, I think you've done some research already but this may just come down to budget. If you're looking for someone to tell you "NO DON'T GET XYZ" I doubt you'll hear anything like that, but if you're using hybrid turbos then some broken axles are likely in your future if you are doing digs.

Making this a GOOD drag car simply means a lot of changes will be necessary. Also worth pointing out the pinion of the oem style diff will break off in addition to the axles.

 

[Brule]

Put a m3 diff and axles in.

Putting a lsd in a 335i housing is all good until you try and launch with slicks on.
You will snap axles, then if you upgrade axles you will snap the joint between your drive shaft and diff.

As for ratio stay with your stock ratio or closest m3 option. If you start 1/4 or half mile racing a bit more dedicated you can get a more suited ratio then.

 

[Dc317]

Ah I knew I left something out, it’s a manual. Running a big single turbo and most likely going to go the ad-e route since I’m well beyond any sort of budget at this point haha

 

[Milan]

Put a m3 diff and axles in.

Putting a lsd in a 335i housing is all good until you try and launch with slicks on.
You will snap axles, then if you upgrade axles you will snap the joint between your drive shaft and diff.

As for ratio stay with your stock ratio or closest m3 option. If you start 1/4 or half mile racing a bit more dedicated you can get a more suited ratio then.

Only if you are manual and not preloading the clutch

 

[tisdrew]

My plan:
* Hoosier slicks
* DSS axles
* Weld manual diff
* Diff brace
* Solid diff bushings
* M3 rear tension rods
* Pray driveshaft doesn't break

 

[Seaneezy]

I have a set of BNIB YCW/MFactory rear axles I can let go for cheap, never installed or unboxed.

As for the discussion, the wavetrac LSD with finned cover in my car has been running well for 20k miles+ with a single fluid change. Had to get a replacement unit at install as the first unit was shaving metal everywhere, I guess they are hit or miss. Have had no problem with this unit outside of some diff noise on steep hills. I was planning on installing the axles when I move to ST, but I'm not aiming for high enough power levels with ST to break the OEM axles. Transmission makes a lot of the difference. The absolute POS 6HP21 in our cars doesn't launch well enough to break a LSD or stock axles, even with 2 step. Post DCT swap there are a lot less options, M3 diff or 8.8 being the primary options. IMO swapping in a 8.8 rear end will take a lot of the BMW DNA out of the car, but if you are strictly for results it will be the best option.

 

[Brule]

I have a set of BNIB YCW/MFactory rear axles I can let go for cheap, never installed or unboxed.

As for the discussion, the wavetrac LSD with finned cover in my car has been running well for 20k miles+ with a single fluid change. Had to get a replacement unit at install as the first unit was shaving metal everywhere, I guess they are hit or miss. Have had no problem with this unit outside of some diff noise on steep hills. I was planning on installing the axles when I move to ST, but I'm not aiming for high enough power levels with ST to break the OEM axles. Transmission makes a lot of the difference. The absolute POS 6HP21 in our cars doesn't launch well enough to break a LSD or stock axles, even with 2 step. Post DCT swap there are a lot less options, M3 diff or 8.8 being the primary options. IMO swapping in a 8.8 rear end will take a lot of the BMW DNA out of the car, but if you are strictly for results it will be the best option.

Ive got an 8.8 diff and you cannot tell the difference between it and the stock housing with lsd. Its still got irs.

 

[SJ_1989]

I think what he means is that you're no longer using a major BMW component anymore. You've swapped it with a Ford unit.

 

[Rob09msport]

I have a set of BNIB YCW/MFactory rear axles I can let go for cheap, never installed or unboxed.

As for the discussion, the wavetrac LSD with finned cover in my car has been running well for 20k miles+ with a single fluid change. Had to get a replacement unit at install as the first unit was shaving metal everywhere, I guess they are hit or miss. Have had no problem with this unit outside of some diff noise on steep hills. I was planning on installing the axles when I move to ST, but I'm not aiming for high enough power levels with ST to break the OEM axles. Transmission makes a lot of the difference. The absolute POS 6HP21 in our cars doesn't launch well enough to break a LSD or stock axles, even with 2 step. Post DCT swap there are a lot less options, M3 diff or 8.8 being the primary options. IMO swapping in a 8.8 rear end will take a lot of the BMW DNA out of the car, but if you are strictly for results it will be the best option.

You still want get rid of the axles?

 

[Seaneezy]

You still want get rid of the axles?

Sure, they've been sitting in my room for a year now, I'll send some pics over later

 

[Gra335]

I have a set of BNIB YCW/MFactory rear axles I can let go for cheap, never installed or unboxed.

As for the discussion, the wavetrac LSD with finned cover in my car has been running well for 20k miles+ with a single fluid change. Had to get a replacement unit at install as the first unit was shaving metal everywhere, I guess they are hit or miss. Have had no problem with this unit outside of some diff noise on steep hills. I was planning on installing the axles when I move to ST, but I'm not aiming for high enough power levels with ST to break the OEM axles. Transmission makes a lot of the difference. The absolute POS 6HP21 in our cars doesn't launch well enough to break a LSD or stock axles, even with 2 step. Post DCT swap there are a lot less options, M3 diff or 8.8 being the primary options. IMO swapping in a 8.8 rear end will take a lot of the BMW DNA out of the car, but if you are strictly for results it will be the best option.

Do you still have these axles?

 

[SlowE93]

It has been close to 4 years. Why not just buy them new?

 

[Gra335]

just trying my luck