724 HP X6M....
 

new 0-60 is 3.8 sec with a new top speed of 202mph with this upgrade...(€15,086, $18,514).

30% driveline loss seems a bit high...

I have heard the X5 and X6 have 30% because of the all wheel drive. True?

I guess the range is between 20-30%, but 30 is pretty high.

Do large really heavy wheels add to the driveline loss?

This is amazing. I think that I really need one of these. I like the look of the X6.

Yes, it is unsprung weight. Wheels, tires, rotors, calipers, suspension bits.

Then tranny friction, internal engine friction, differential etc.

If you are accelerating and braking, yes, due to the inertia. At a steady state ie constant speed, no, except for the wind resistance of wider tires (not an issue on a dyno).

Seems high. Helps a tuner out though, because it allows them to claim a higher flywheel power rating, whether or not they have validated the driveline losses.

Why does unsprung weight matter for driveline losses? Why does engine friction matter for driveline losses?

there are more and more high HP claims on these cars, but how come different tuners quote different results with the same kinda combo - chip & exhaust.
it would be interesting to read a customer's view of a chipped vehicle.

All that is factored into the loss factor are rotational inertia and friction in the transmission and drivetrain.

Because it is the internet, and there are no penalties for lying.

Customer opinions may matter, but what would be more valuable would be independent verification by a certified authority. Customers don't tend to have dynos available to them, and they also tend to have a vested interest in their tuning investment having been a wise one. Few customers are going to compare multiple tunes.

AWD and automatic.

What is really funny is that the numbers he shows aren't 30% in any case. He calculated 30% of the wheel hp, instead of 30% of the presumed flywheel hp. His number of 167 hp losses in the drivetrain is actually 23% of the measured wheel hp. Even that number is questionable, as it means that 167 hp = 125 kw are being radiated out of the transmission and differentials as heat.

If the standard vehicle makes 550 flywheel hp, and actually had 23% driveline losses, that means that 126 hp is being dissipated as heat. Why would modifying the engine result in 41 more hp being lost in the driveline? It is the same driveline as before the modifications. Any discussion of driveline losses as a percent is on a shaky foundation to start.

I don't know what is worse; this tuner not knowing any of that; or making an error in the calculation if we give him a pass on his illogical approach; or him knowing it is all bogus and trying to use it to sell his tune.

Wonder if it comes with a dash plaque saying 724 hp?

http://t2.gstatic.com/images?q=tbn:2...0/arrow-up.jpg

Good post.

Paging cmyX6go..... next car right here. :D

724 horses is INSANE! Every day I'm floored when I kick my 440 and I think about the difference going to 550 on the ///M. But 724?!?!?!?!??!

What do you think? 5 mpg?

I want a 1000 hp.

holy wow... i totally skipped the 30% of the wheel hp part. That's kind of funny.

Take this for what it's worth... (and let me preface this with the comment that the only similarities in my example are the AWD/Auto)... Dinan quotes the S/C 4.6L motor at 451 brake, and I saw 325 wheel.

Yeah.....30% is WAY too high. If that is the case then my car has 728 crank....I put down 510 AWHP on my mustang dyno.....i htink the only issue right now is that no one has standardized the HP@50 number....im still thinking that it is 10-15% drive train loss and 20% at the max.

I did an upgrade for my chip & exhaust and they claim 630-650 HP, so i did my dyno test and it came around 511whp

but lets be honest the difference is huge you can feel more power and more acceleration it real worth the money i spend.

What chip and exhaust? Spoke with ESS and they are getting about 610-620 without exhaust. But they are still doing more testing.

M

I did it with PP performance, i think most chip (ECU) upgrade have same output.