[IND-Distribution]

     Featured on BIMMERPOST.com

Join us for another world first independent dyno (following up on our G87 M2) - with BMW's monster G09 XM. As with many of BMW's new models, the XM has to be seen in person to truly appreciate its presence; and there was something wonderfully entertaining about watching it lumber onto the dyno rollers.

We were back at Performance Eurowerks for the second time in the last month, this time to see what the XM has in store. The first attempt yielded some promising returns as it was cut short and we were forced to add additional strapping to secure the XM onto the rollers. Unfortunately, the excitement was cooled just a bit as we tried to figure out exactly how the hybrid system was functioning while in BMW's dyno-mode. The EPower gauge did ramp up during the dyno pull, but then spiked at 6500rpm which was directly visible on the dyno graph which made us question real-world accuracy.



Our Best Run Pre Break-in - Dynojet 424 - Including EPower "spike":
IND G09 XM: 614.84hp at 6500rpm // 569.14tq at 2380rpm
IND G09 XM Crank (assuming approximate 20% loss): 768hp // 712tq

Without EPower Spike:
G09 XM — 573.49hp at 5790rpm // 516.42tq at 5790rpm
IND G09 XM Crank (assuming approximate 20% loss): 715hp // 645tq

There's no way around it, the results were less than clear. Unfortunately the XM was not fully charged which could have had an effect on the hybrid system functionality on the dyno. We're also not sure if BMW's dyno-mode employs the electric motor differently from its standard operation. We're also not certain if allowing more break-in miles would change the outcome, so we will have to explore our results and possibly reach out to BMW for clarification.

As an aside, we did attempt to get the XM onto PE's corner balance scales, but the scales were having none of it; it's just a bit too portly which we expected. So we may see a trip to a tractor trailer weigh station in our future!

[CntryClub007]

PE is a great group! Best in Chicago IMO. Glad to see the Dyno is still getting some good use…Runs look very consistent - 614whp / 569wtq - nice!

[JoseSportM]

I would not be surprised that electric engine to be programed to not deliver the full performance in the break in period. But this is just speculation. Thank you for your review and good luck with this project.

[hufington]

Tractor trailer weight station for the ultimate M car! Holly crap!

[RichP]

Originally Posted by hufington

Tractor trailer weight station for the ultimate M car! Holly crap!

This pretty much says it all.

[Doctor///M]

How do you assume 20% drivetrain losses?

Typically it is assumed at 15% and can only imagine reduces given technological improvements over time, not to mention the non-linear aspects of the equation. This will have an impact on the assumed the engine output, inflated perhaps?

[LSM]

Originally Posted by Doctor///M

How do you assume 20% drivetrain losses?

Typically it is assumed at 15% and can only imagine reduces given technological improvements over time, not to mention the non-linear aspects of the equation. This will have an impact on the assumed the engine output, inflated perhaps?

Exactly… no chance 20% loss even 15 is high

[IND-Distribution]

Originally Posted by LSM

Exactly… no chance 20% loss even 15 is high

We quoted the figure that PE gave to us as what they usually see on the AWD EVOs they've tuned over the years. That said, we suppose we'd hope that the new XM has less drivetrain losses than older Mitsubishi EVOs.

[EndBosS]

You're doing a Dyno run without datalogs?
Looking at those fans, I can imagine there are issues...

[hufington]

That's the Twitter post BMW just shared:

The BMW #X7 is preparing for victory. The largest BMW ever has touched down at the Kentucky Derby. Find out more here: https://bit.ly/3pcDQ2T

I guess this is the direction BMW chose, building monster trucks. They started well with the XM!

[G30M]

i stop reading when people guess crank power.

i don't count the spike, peak seems to be 570 whp.

[MilehighM3]

Originally Posted by JoseSportM

I would not be surprised that electric engine to be programed to not deliver the full performance in the break in period. But this is just speculation. Thank you for your review and good luck with this project.

The engine power output and redline are reduced on the S68 during break in also. It’s displayed in the kombi.

[hotrod182]

Originally Posted by MilehighM3

The engine power output and redline are reduced on the S68 during break in also. It’s displayed in the kombi.

It looks like the pull hit over 7000RPM on the graph.

[ChrisM4]

How embarrassing is this for M…artificial power spike and needing to go to a tractor trailer weighing station to weigh it!

[MilehighM3]

Originally Posted by hotrod182

It looks like the pull hit over 7000RPM on the graph.

They increase with mileage. IIRC around 480 miles they go up.