facelift/pre-facelift & 1/2 model years??

[PropellerHead]

I drove a 10/2004 model for nearly 7 years. I loved that thing. Early 2004 X5's (including yours) have XDrive. A change to the standard all wheel drive of the pre-facelift. X Drive can put 100% of the engine power to the one wheel it senses with traction. The older ones were static 48/52 (I think that's the right ratio)

The best thing ab early '04's? The good ole, reliable small sunroof. Less top side weight, too. Between the lowered weight so high on the body and the intelligent XDrive, I still find myself looking for early face lift builds. After they cleared through the body's from the older models with smaller roofs, they rolled out the 4.8is and the giant, heavy glass up top. Such a silly idea for a performance geek. Great for a rich mom, though.

Also, no screwy adaptive headlights. The ones on my 4.8is have yet to break, but when they do, I will strongly consider just getting the early ones. That said- it *is* cool that they sweep from left to right based on steering input. And it *is* cool to watch happen. But it does absolutely nothing practical (for me) and is thus just a gimmick as far as I am concerned.

You got screwed on Bluetooth, but so did every 2004 and it is an easy fix. I replaced the SOS module with a BT module and BOOM: Bluetooth.

Those are the two big things that I noticed when I went from my '04 3.0 to an '04 4.8is (07/04 build). Well, besides the obvious.

[TiAgX5]

Originally Posted by PropellerHead

I drove a 10/2004 model for nearly 7 years. I loved that thing. Early 2004 X5's (including yours) have XDrive. A change to the standard all wheel drive of the pre-facelift. X Drive can put 100% of the engine power to the one wheel it senses with traction. The older ones were static 48/52.........

Not the case. Pre-facelift Xs were able to direct 100% of torque to front/rear axles and side to side using automatic brake activation. The XDrive just does this using the transfer case actuator to adjust fore/aft and still uses the brake actuation for side to side (just like pre-facelift).

Here's a good example of a pre-facelift transferring torque. You can see the X spinning front/rear/front/rear tires in search of grip......

BMW x5 summer tyres on snow - YouTube

[PropellerHead]

Originally Posted by TiAgX5

Not the case. Pre-facelift Xs were able to direct 100% of torque to front/rear axles and side to side using automatic brake activation.

I'd like your source on that one. Everything I have seen including my experience with a 2001 X5 since new and the two Xdrive 2004's is different. If you're saying it's 100% of *available* torque, that would be correct, but the available TQ to front and rear is not 100% of the engine power in the earlier cars. The later cars transfer allows this.

Also, I am reading I had the earlier ratio incorrect. Still fixed, but fixed at 38/62.

The video shows an X5 with ZERO grip on all wheels. The later portion of the video shows that the other wheels are spinning at the same rate or close to it until the braking kicks in. This happened quite a bit on my '04 3.0 in the snow and would be expected in that case.

[bcredliner]

Originally Posted by PropellerHead

I'd like your source on that one. Everything I have seen including my experience with a 2001 X5 since new and the two Xdrive 2004's is different. If you're saying it's 100% of *available* torque, that would be correct, but the available TQ to front and rear is not 100% of the engine power in the earlier cars. The later cars transfer allows this.

Also, I am reading I had the earlier ratio incorrect. Still fixed, but fixed at 38/62.

The video shows an X5 with ZERO grip on all wheels. The later portion of the video shows that the other wheels are spinning at the same rate or close to it until the braking kicks in. This happened quite a bit on my '04 3.0 in the snow and would be expected in that case.

Are you talking about the loss of torque from the engine flywheel to the tires?

[TiAgX5]

Originally Posted by PropellerHead

I'd like your source on that one. Everything I have seen including my experience with a 2001 X5 since new and the two Xdrive 2004's is different. If you're saying it's 100% of *available* torque, that would be correct, but the available TQ to front and rear is not 100% of the engine power in the earlier cars. The later cars transfer allows this.

Also, I am reading I had the earlier ratio incorrect. Still fixed, but fixed at 38/62.

The video shows an X5 with ZERO grip on all wheels. The later portion of the video shows that the other wheels are spinning at the same rate or close to it until the braking kicks in. This happened quite a bit on my '04 3.0 in the snow and would be expected in that case.

The TC torque split on pre-facelift was 38%f/62%r while driving without tire slippage. When slippage was detected the brakes on the slipping wheels were activated automatically which transferred torque to the wheels with grip. Not sure of the absolute limit BMW programmed into the system.

[bcredliner]

Originally Posted by TiAgX5

The TC torque split on pre-facelift was 38%f/62%r while driving without tire slippage. When slippage was detected the brakes on the slipping wheels were activated automatically which transferred torque to the wheels with grip. Not sure of the absolute limit BMW programmed into the system.

I don't know the absolute % either and don't why it would be less than 100% at the wheels that aren't spinning.

[TiAgX5]

Originally Posted by bcredliner

I don't know the absolute % either and don't why it would be less than 100% at the wheels that aren't spinning.

I don't see why seeing how all modern cars/trucks are required to have braking systems that can overcome the max torque produced by their powerplants.

[PropellerHead]

Originally Posted by TiAgX5

I don't see why seeing how all modern cars/trucks are required to have braking systems that can overcome the max torque produced by their powerplants.

Because it was based on the the legacy AWD system that had been in use since the early iX cars from the 80's. On the early X5's, this is a planetary gearing that fixes the amount of TQ/power to the front or rear axle. In the early X's- 38 Front:62 Rear. Front rear power/TQ transfer is not programmed at all in the early X5's. It's fixed by the gears.

Xdrive uses a multiplate clutch system on the output side of the transmission that allows the system to modulate/vary the amount of TQ between the front and rear axles. XDrive computer control is able to activate this clutch within something like 1/10 of a second for up to 100% to the front or rear axle. The drive is normally split at 40F:60R for XDrive cars.

It is a significant difference from the early/non facelift cars. XDrive is one of the main reasons I bought one in 2004.

[Normd996]

Originally Posted by PropellerHead

I drove a 10/2004 model for nearly 7 years. I loved that thing. Early 2004 X5's (including yours) have XDrive. A change to the standard all wheel drive of the pre-facelift. X Drive can put 100% of the engine power to the one wheel it senses with traction. The older ones were static 48/52 (I think that's the right ratio)

The best thing ab early '04's? The good ole, reliable small sunroof. Less top side weight, too. Between the lowered weight so high on the body and the intelligent XDrive, I still find myself looking for early face lift builds. After they cleared through the body's from the older models with smaller roofs, they rolled out the 4.8is and the giant, heavy glass up top. Such a silly idea for a performance geek. Great for a rich mom, though.

Also, no screwy adaptive headlights. The ones on my 4.8is have yet to break, but when they do, I will strongly consider just getting the early ones. That said- it *is* cool that they sweep from left to right based on steering input. And it *is* cool to watch happen. But it does absolutely nothing practical (for me) and is thus just a gimmick as far as I am concerned.

You got screwed on Bluetooth, but so did every 2004 and it is an easy fix. I replaced the SOS module with a BT module and BOOM: Bluetooth.

Those are the two big things that I noticed when I went from my '04 3.0 to an '04 4.8is (07/04 build). Well, besides the obvious.

This is an older thread but do you have the part number you used for the Bluetooth

Thanks

[PropellerHead]

Originally Posted by Normd996

This is an older thread but do you have the part number you used for the Bluetooth

Thanks

This was the part # I ordered in 2011.

84216934961 OEM BMW Hands-Free System with Bluetooth Technology