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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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Old 06-11-2011, 09:41 PM   #61
SamDoe1
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Quote:
Originally Posted by karatechop5000 View Post
If I jack up my front end, put on the ebrake, and put the car in drive; will that be a definative test? If the fronts spin, we have an open transfer case. Does anybody see a problem with that test?

Edit. DSC off.
Well I think you just proved it. Case closed then!
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Old 06-12-2011, 06:57 AM   #62
Kubica
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Originally Posted by karatechop5000 View Post
Does anybody see a problem with that test?
1) Did you give it some gas?
2) What happens when you floor it without the e-brake on?
3) With 4 wheels on the ground, can you put it in D, set the handbrake, and not move anywhere?
4) What happens when you do the same thing with the rear off the ground?

In a simple planetary gear set, there is one input, one output, and one fixed component. On our TC, there's one input (planetary carrier) and two outputs (sun to the front; ring to the rear). By lifting the front, you are in effect making the ring gear fixed, and turning it into a simple torque reducing planetary gear set. This move toward a simple planetary gear set is the 'slip' and is the reason the drivetrain doesn't bind up around corners. Even in a simple planetary gear set, a fixed ring gear is under load.

That video proves the TC isn't a 4x4 locker, and that your car won't drive itself up a hill at idle with the e-brake on.
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Old 06-12-2011, 02:57 PM   #63
TiAgXi
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Well I think you just proved it. Case closed then!
+1
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Old 06-12-2011, 07:51 PM   #64
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Quote:
Originally Posted by Kubica View Post
1) Did you give it some gas?
A little bit. Before I got out of the car to shoot the video.

Quote:
Originally Posted by Kubica View Post
2) What happens when you floor it without the e-brake on?
Did not do that.

Quote:
Originally Posted by Kubica View Post
3) With 4 wheels on the ground, can you put it in D, set the handbrake, and not move anywhere?
Yes. As with all automatics. Engine revs to stall limit.

Quote:
Originally Posted by Kubica View Post
4) What happens when you do the same thing with the rear off the ground?
Same thing? I don't have a front ebrake; so I couldn't easily test.

Quote:
Originally Posted by Kubica View Post
In a simple planetary gear set, there is one input, one output, and one fixed component. On our TC, there's one input (planetary carrier) and two outputs (sun to the front; ring to the rear). By lifting the front, you are in effect making the ring gear fixed, and turning it into a simple torque reducing planetary gear set. This move toward a simple planetary gear set is the 'slip' and is the reason the drivetrain doesn't bind up around corners. Even in a simple planetary gear set, a fixed ring gear is under load.
Agreed (except for the last sentence). 'Hold' is not either off or on. It's on with traction; and its variable during slip. I view it as 'feedback torque'. The ring is easily held until the fronts grab ahold of something.

Quote:
Originally Posted by Kubica View Post
That video proves the TC isn't a 4x4 locker, and that your car won't drive itself up a hill at idle with the e-brake on.
Could you agree "Its open; but specific torque ratio is enforced by wheel traction, 1/1 speed ratio is dependent on planetary gearset's 'mode', and it is permanantly engaged." ?

Last edited by karatechop5000; 06-12-2011 at 07:53 PM.
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Old 06-13-2011, 09:07 AM   #65
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Originally Posted by karatechop5000 View Post
Could you agree "Its open; but specific torque ratio is enforced by wheel traction, 1/1 speed ratio is dependent on planetary gearset's 'mode', and it is permanantly engaged." ?
I would agree with this sentence except for adding in the statement of up to a maximum of the ideal torque split. Even with the ring gear held fixed with traction, you are still gearing the front wheels down through the planetary gears and therefore reducing the percentage of engine torque heading to the front.
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Old 06-13-2011, 04:39 PM   #66
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I can answer all of this bullshit if you want I've had an xi in my garage with the front half shaft off. Only reverse works, The car won't move, vise versus. If you disconnect the rear half shaft it won't move unless in reverse. Nothing needs to be reflashed for the car to work, etc. No check engine lights provided you rewired your wheel speed sensors for your dsc/abs system. Bottom line is this has already been covered. forget about your tq split you guys are missing how this system works. wtf EDIT: you don't have a limited slip or an open TC Another EDIT: if you don;t have your abs unplugged, your DSC is still on so this thread has been a fail the whole time.

Last edited by xixixi; 06-13-2011 at 05:07 PM.
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Old 06-13-2011, 05:20 PM   #67
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Originally Posted by xixixi View Post
I can answer all of this bullshit if you want I've had an xi in my garage with the front half shaft off. Only reverse works, The car won't move, vise versus. If you disconnect the rear half shaft it won't move unless in reverse. Nothing needs to be reflashed for the car to work, etc. No check engine lights provided you rewired your wheel speed sensors for your dsc/abs system. Bottom line is this has already been covered. forget about your tq split you guys are missing how this system works. wtf EDIT: you don't have a limited slip or an open TC Another EDIT: if you don;t have your abs unplugged, your DSC is still on so this thread has been a fail the whole time.
I'd ask a few questons; but you seem kinda edgy.
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Old 06-13-2011, 05:33 PM   #68
xixixi
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I'd ask a few questons; but you seem kinda edgy.
Shitty day my friend, ask away! I'm sure I could help ya out I refuse to read this entire thread!
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Old 06-13-2011, 06:04 PM   #69
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Some of the threads I read seemed to give conflicting information. I'd like to see a link to the one you are referring to. I think I read it and came away confused. Also the issue came up in another good thread about putting in a rear wavetrak LSD. I have seen the issue indirectly come up in staggared tire size threads.

I was trying to 'keep the ball on the court' by staying focused on the transfer case. (I fear a lot of smart people here have a misunderstanding). I know it's a boring read, but my nerd antenna is fully extended.

First question: What's the thread title you are referring to?
Second question: What does the DSC do when 'off' different than when 'on'?
Third question: If the transfer case is not 'fixed', 'open', or 'limited slip'; what is the other choice?

Last edited by karatechop5000; 06-14-2011 at 08:09 AM.
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Old 06-13-2011, 06:16 PM   #70
xixixi
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Originally Posted by karatechop5000 View Post
Some of the threads I read seemed to give conflicting information. I'd like to see a link to the one you are referring to. I think I read it and came away confused. Also the issue came up in another good thread about putting in a rear wavetrak LSD. I have seen the issue indirectly come up in staggared tire size threads.

I was trying to 'keep the ball on the court' by staying focused on the transfer case. (I fear a lot of smart people here have a misunderstanding). I know it's a boring read, but my nerd antenna is fully extended.

First question: What's the tread title you are referring to?
Second question: What does the DSC do when 'off' different than when 'on'?
Third question: If the transfer case is not 'fixed', 'open', or 'limited slip'; what is the other choice?
http://forum.e46fanatics.com/showthr...ghlight=xi+rwd

I gave up on the thread, but I got it done.
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Old 06-13-2011, 06:52 PM   #71
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http://forum.e46fanatics.com/showthr...ghlight=xi+rwd

I gave up on the thread, but I got it done.
Did you ever finish the conversion?
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Old 06-13-2011, 07:10 PM   #72
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OK yes. Your thread was right about the TC. Other threads... not so much. It's 'open'. That's why you were spinning the fronts after removing the front axle. The reverse is a puzzle to me. I think either something in the front was jammed up, or it was rolling backwards down your driveway.
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Old 06-14-2011, 09:54 AM   #73
xixixi
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Did you ever finish the conversion?
yes.

Just the front output on the T case was spinning yes. Idk about the reverse. However a few people drove it before i swapped the diff and they said in reverse it "felt" like an lsd? IDK

Last edited by xixixi; 06-14-2011 at 09:56 AM.
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Old 06-14-2011, 08:27 PM   #74
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Old 06-14-2011, 11:52 PM   #75
karatechop5000
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Damn. Good point. But we don't have a torsen. Got me thinking though.
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Old 06-16-2011, 05:50 PM   #76
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I saw Steve Dinan last night and asked him if he knew how the E46 transfer case worked. He smiled and said his "head was filled with pistons and boost right now" and that he didn't know.

Also asked him if he planned on making any more xi springs, since they've been out of stock for a couple years. He had no idea and punted on that question too.
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