MFactory LSD Questions

[rstihl]

[IMG]


ok, will the pumpkin ($1999.95) for the e92 fit in a 2010 135i 6mt?

[tglazed]

I would probably shoot an email to M-Factory to get an answer or possibly to a retailer of the diff.

[Pig Farmer]

Yes, but the $1,999 unit has a 3.46 ratio, whereas the MT has a 3.08 ratio. A number of people run the 3.46 ratio with a MT for the added effective torque, but your top end & gas mileage suffers. Personally I wouldn't recommend the 3.46 ratio with your MT. The ratios in the MT are short enough as is.

If you decide to go with the 3.46 ratio, keep in mind that it could impact the core charge.

[rstihl]

i want a 3.46 final drive. also is the $2699 unit more expensive because its a 3.08 final drive. I want to understand why that one costs more.

[B6T]

Originally Posted by Pig Farmer

The ratios in the MT are short enough as is.

I HATE the gearing in the 135.

... which is precisely why I have two 3.46 differentials from automatic 335s sitting under my bench in the garage awaiting spring time...

[Pig Farmer]

Originally Posted by B6T

I HATE the gearing in the 135.

... which is precisely why I have two 3.46 differentials from automatic 335s sitting under my bench in the garage awaiting spring time...

Interesting. I know everyone has their own goal when modding their car, but what do you hate?

I find that with my moderately tuned MT 135i, the 3.08 ratio is almost too close to take advantage to the torque generated by the engine. In fact there's more than enough torque to break the tires free in 1st, 2nd and 3rd gear if you get aggressive with the throttle. That's with a LSD and running 265 section width PSSs. If anything, I think I could get away with a slightly taller final ratio and have even considered installing the DCT's 2.81 ring and pinion.

[Pig Farmer]

Originally Posted by rstihl

i want a 3.46 final drive. also is the $2699 unit more expensive because its a 3.08 final drive. I want to understand why that one costs more.

The ring gear on the MT is welded to the OE differential whereas the AT ring gear is a bolt-on unit. The additional cost is for removing and machining the ring gear.

[lowbudgethero]

Originally Posted by Pig Farmer

Interesting. I know everyone has their own goal when modding their car, but what do you hate?

I find that with my moderately tuned MT 135i, the 3.08 ratio is almost too close to take advantage to the torque generated by the engine. In fact there's more than enough torque to break the tires free in 1st, 2nd and 3rd gear if you get aggressive with the throttle. That's with a LSD and running 265 section width PSSs. If anything, I think I could get away with a slightly taller final ratio and have even considered installing the DCT's 2.81 ring and pinion.

Agreed, 3.46 is great for a stock or mild tune perhaps one with a boost response that increases as you rev. It's pretty wild to handle on a cold day with the 3.46 LSD, 255 ZII tires, tune, intercooler, and downpipes. If you think of what kind of tires a 400-450hp a modern car is running and what you can fit on the stock car it's amazing we get as much grip as we do. At a stock or reduced tune the car is pretty much perfectly balanced for the gears.

I think the 3.08 is a good ratio with the right tires, the only think I wish I had with my 3.46 was a taller 6th gear, 5th and 6th seem too close now.

[HP Autosport]

Originally Posted by Pig Farmer

Yes, but the $1,999 unit has a 3.46 ratio, whereas the MT has a 3.08 ratio. A number of people run the 3.46 ratio with a MT for the added effective torque, but your top end & gas mileage suffers. Personally I wouldn't recommend the 3.46 ratio with your MT. The ratios in the MT are short enough as is.

If you decide to go with the 3.46 ratio, keep in mind that it could impact the core charge.

Many of you may not know this, but Mfactory chose to use the smaller 3.46 final drive, not the correct large case pumpkin that is more expensive and harder to come by. If you have a MT, that is a 3.08 large case and should only replace it with the same large case 3.46 from the early 335i autos.

[ShocknAwe]

2.81 would be interesting. Has anyone done that on a tuned MT 135i?

[arcticcat522]

Originally Posted by Pig Farmer

Interesting. I know everyone has their own goal when modding their car, but what do you hate?

I find that with my moderately tuned MT 135i, the 3.08 ratio is almost too close to take advantage to the torque generated by the engine. In fact there's more than enough torque to break the tires free in 1st, 2nd and 3rd gear if you get aggressive with the throttle. That's with a LSD and running 265 section width PSSs. If anything, I think I could get away with a slightly taller final ratio and have even considered installing the DCT's 2.81 ring and pinion.

I have the same feeling. Would like to know if anyone has done this also.

[HP Autosport]

Originally Posted by MFactory

Ermm, no.

For the large 215 diff, we have 2.56, 2.81, 3.08 and 3.46 available and in stock, ready to ship, with all final drives (ring & pinions) interchangeable as we have both oem machined and brand new MFactory ring & pinions on the shelf (and we are the only company to offer brand new, upgraded/stronger ring & pinions with the stock oem ratios)

For the small 188 diff, we have the 3.46's (oem) in stock as well.

Not quite sure where you got your information from, but you are wrong.

P.S Those images in the OP are from ECS Tuning, which is not 100% accurate

Customer supplied part. Maybe it was the other way around. Customer said to install it anyway.

[500AF]

Originally Posted by MFactory

Maybe? Word of advice; before trying to pass information off as the truth, you should try to get your facts in order first.

And thanks for the apology btw...

I would be really interested to know how different the MT feels with the 3.46 gears?

For me the 3.08 feels like the gears are way to long but going to a 3.46 may be way to aggressive.

Does anyone make a gear in between? Are we allowed to ask how much it cost on here?

[Dmak]

My car is 6mt, fbo+inlets with mhd stage 2+ 91oct. I got the mfactory lsd with 3.08. From my experience, before inlets with 245 mpss, it does feel like i can use more torque from 3.46. But after inlets and mfactory flywheel, i m starting to have traction problem. Now, yes, you can change suspensions/wheels/tires set up to get better traction which = $$. Now my 1st gear almost feels useless, and just zip by so fast. One thing to keep in mine is, no matter what diff you put in, the ratio in the transmission(between gears) will not change unless u get a different or custom geared transmission. At the end of the day, having extra torque is always good, but the problem would be is the car set up to handle all that extra torque.
A fbo+ inlets car with 3.46, my guess would be 1st and 2nd gear would go by so fast, might have a hard time to keep up with shifting.

[ShocknAwe]

Originally Posted by Dmak

My car is 6mt, fbo+inlets with mhd stage 2+ 91oct. I got the mfactory lsd with 3.08. From my experience, before inlets with 245 mpss, it does feel like i can use more torque from 3.46. But after inlets and mfactory flywheel, i m starting to have traction problem. Now, yes, you can change suspensions/wheels/tires set up to get better traction which = $$. Now my 1st gear almost feels useless, and just zip by so fast. One thing to keep in mine is, no matter what diff you put in, the ratio in the transmission(between gears) will not change unless u get a different or custom geared transmission. At the end of the day, having extra torque is always good, but the problem would be is the car set up to handle all that extra torque.
A fbo+ inlets car with 3.46, my guess would be 1st and 2nd gear would go by so fast, might have a hard time to keep up with shifting.

You want long gearing in turbo cars not short. Relatively of course. Spinnings not winning and you want to stay in boost as long as humanly possible. Every time you shift you lose.

[ShocknAwe]

I actually think on a modified N54, especially if larger turbos are added, that a 2.81 rear from the 335d would be perfect.

Edit: Old thread and I seem to be repeating myself, haha

[Dmak]

Originally Posted by ShocknAwe

I actually think on a modified N54, especially if larger turbos are added, that a 2.81 rear from the 335d would be perfect.

Edit: Old thread and I seem to be repeating myself, haha

I 100% agree. Especially with the power that a tuned n54 can put out. But 3.46 would be a cheap/easy upgrade to get more torque for someone who only doing a light tune. 3.46 can also be useful on autox or road crouse(depend on the track).
For how my car is tuned right now, i wouldnt want the 3.46 in my car for sure.

[ShocknAwe]

Originally Posted by Dmak

I 100% agree. Especially with the power that a tuned n54 can put out. But 3.46 would be a cheap/easy upgrade to get more torque for someone who only doing a light tune. 3.46 can also be useful on autox or road crouse(depend on the track).
For how my car is tuned right now, i wouldnt want the 3.46 in my car for sure.

Oh yeah, if we are talking about track duty, it depends on where you want to be in the power band coming out of the corner. Pick your poison then.

[500AF]

Originally Posted by Dmak

I 100% agree. Especially with the power that a tuned n54 can put out. But 3.46 would be a cheap/easy upgrade to get more torque for someone who only doing a light tune. 3.46 can also be useful on autox or road crouse(depend on the track).
For how my car is tuned right now, i wouldnt want the 3.46 in my car for sure.

Its too bad they don't make something in between the 3.08 and 3.46.

[Dmak]

Originally Posted by 500AF

Its too bad they don't make something in between the 3.08 and 3.46.

Fyi. The 1m has 3.15, but thats a completely different diff.

https://www.1addicts.com/forums/showthread.php?t=463740

[500AF]

Originally Posted by Dmak

Fyi. The 1m has 3.15, but thats a completely different diff.

https://www.1addicts.com/forums/showthread.php?t=463740

I actually did notice that when I first started researching it. From everything I have been reading I will probably stick with the 3.08 and just get a limited slip.

With the 3.08 6th gear is rated at something like 190mph plus and I dont ever see myself going that fast hence why I wanted lower gears. 3.46 would probably be way to low.