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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here. |
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#61 |
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That's pretty cool being able to swap between the two types of drive. I live up in a snow state too, so I feel your pain. Keep up the creativity, and wrenching.
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#62 |
Registered User
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Sick
Awesome post man
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#63 |
Registered User
Join Date: Jan 2014
Location: Denver, CO
Posts: 121
My Ride: 330xi, 330i, 135i
Transmission: 6MT
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Haha thanks
As for an update, I'm over 5k miles in with no issues. I swapped my 3.07 rear diff for a 3.46, which is pretty great. I have the matching front diff too, if I want to go back to 4wd. Any electronics guys out there? I've been researching a work-around for the single stage xi DSC. I found a thread that seems to confirm the later e39 Bosch 5.7 units will bolt right in with a few swapped pins in the connector. I'm wondering if the new unit will bring fully disable-able DSC to the car, or if coding it will force it to act like a normal xi unit. |
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#64 | |
Registered User
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If we can turn off our DSC units' longitudinal differential-lock function (braking the slipping axle as previously discussed), then this mod can be done without any risk to drivetrain components. |
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#65 | |
Registered User
Join Date: Jan 2014
Location: Denver, CO
Posts: 121
My Ride: 330xi, 330i, 135i
Transmission: 6MT
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#66 | |
Registered User
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Hi! Congratulations for the good idea ![]() Do you think that it's possible to obtain the same result like in the following picture? I'm thinking to weld all the space inside the red arrow, and completely remove all the other gears (yellow arrows). Because there is no more reason to leave connected the central/front gears (less components, less friction and less heat). What do you think about? ![]() Last edited by ROX; 10-10-2017 at 06:00 PM. |
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#67 |
Registered User
Join Date: Jan 2014
Location: Denver, CO
Posts: 121
My Ride: 330xi, 330i, 135i
Transmission: 6MT
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I'm not really sure how you would accomplish the extra welds you're talking about, and they seem unnecessary if you're going to start by following in my footsteps. That input gear you're pointing to (red) is already locked in place while in constant mesh with the welded planetary unit on the other side of the case. As for removing the other gears for weight and friction reduction, I thought about it but it seemed like more trouble than it was worth. The outer of the two gears is involved with retaining the front output flange. Removing it would bring up a new problem of sealing the case. Removing the big intermediate gear is more feasible, but getting it out would have required major disassembly of rest of the internals, including pulling bearings, and I didn't want to mess with it. Also, you could end up with lubrication issues without those gears there to carry oil up to the carrier and bearings. But hey, this is all speculation anyway. I say go for it. Tell us how it works out...
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#68 |
Registered User
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I will receive the spare transfer case in next few days... I let you know
![]() Last edited by ROX; 10-12-2017 at 07:31 PM. |
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#69 |
Registered User
Join Date: Jan 2014
Location: Denver, CO
Posts: 121
My Ride: 330xi, 330i, 135i
Transmission: 6MT
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Back to 4wd just in time for the first snow day of the year. I put about 10k on the car in rwd with the front diff and axles still in place. No noise or vibrations on the ride home. I'd say this first season was a success.
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#70 | |
Registered User
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Thanks for the update. I haven’t had time to explore the traction control issue discussed previously, but hopefully sometime this winter so I could try this out during the summer. |
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#71 |
Registered User
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I was thinking about this recently. My thought was a disconnect like the front axels on the YJ jeeps. But, I am curious now. What happens if you just remove the front drive shaft without welding anything. In the real world, this would be the equivalent of having the front tires on ice, and the rear on pavement. Looking at drawings of this transfer case, it doesn't resemble a differential at all. Again, just curious and looking for a conversation, not a debate. let me know what you think.
The manual states "The transmission ratio of the planetary gearset provides a fixed torque transfer of 38:62 (front:Rear). The output speeds to the frontand rear axle are the same (1:1). https://www.manualslib.com/manual/80...page=54#manual |
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#72 | |
Registered User
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$200 rwd conversion
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If you were to remove the front driveshaft without welding, the front driveshaft output would spin freely and the car wouldn’t move. This is not equivalent to having the front tires on ice and the rear on pavement because without the front driveshaft in place, the car is unable to force power to the rear wheels by braking the front wheels. Our AWD system would be worthless without the DSC module. Last edited by xi46; 12-14-2017 at 10:27 PM. |
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#73 | |
Registered User
Join Date: Jan 2014
Location: Denver, CO
Posts: 121
My Ride: 330xi, 330i, 135i
Transmission: 6MT
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Quote:
The "torque split" is the natural result of the sun and ring gears being different sizes. The planets are providing power to the sun and ring simultaneously. When a differential action occurs, the X-many-tooth planets rolling on the Y-tooth ring versus Z-tooth sun creates two different torque ratios, hence the rwd bias. This only occurs when the planets are spinning for diff action, so under normal conditions its really 50/50. Last edited by Manchicle; 12-14-2017 at 11:51 PM. |
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#74 |
Registered User
Join Date: Jan 2014
Location: Denver, CO
Posts: 121
My Ride: 330xi, 330i, 135i
Transmission: 6MT
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In essence, by removing the front driveshaft, the traction of the rear wheels would "hold" the ring gear. Applying power to the planets inside a held ring gear would just spin the crap out of the "free" sun gear. Again, to compare to the rear, if you pull one wheel off and leave the other on the ground, you're essentially "holding" one of the spider gears and sending power through the diff, making the "free" side go extra fast.
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#75 |
Registered User
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Thank you both for the explanations. I appreciate your time.
Sent from my iPhone using E46Fanatics |
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#76 |
Registered User
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I purchased a TC today and plan to do the same conversion.
Plenty of time to wrestle the old TC free while the car is away for the winter. I will document as much as I can. |
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#77 |
Registered User
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I just bought a 2001 330xi and my front differential basically exploded the night I bought the car. This should be very helpful. Thank you
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#78 |
Registered User
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Found one from an AT which is the same PN as the MT, and i thought were going for cheaper than ones from a MT.
Not sure about the "adapter shaft" though. If I have a MT I assume I already have that- any ideas? http://www.realoem.com/bmw/enUS/show...diagId=27_0013 |
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#79 |
Registered User
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My children, unplug abs brain in drug bin. remove front half shaft, remove tranny, tcase, add a rwd trans, plus this custom trans mount. This custom trans mount is for sale, uses all oem mounting locations on xi's, direct swap. With this custom mount, you can make your xi rwd. I sold my old rwd swap xi, working on a new project. GL, if you guys have any questions lmk. To the guy above me, yes if you have a manual tc laying around you have that small shaft.
Last edited by 332; 04-26-2018 at 09:23 PM. |
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#80 | |
Registered User
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Where you been hiding with this!!
How much does this sell for? You fabricate it your self? Quote:
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