[Gitte]

Originally Posted by paul e

I'm a bit confused, please straighten me out…new to BMW as well…

Dinan Stage 1 costs $1399, gives 412 HP / 430 lb-ft of torque and has a warranty that matches the BMW warranty.

The MPPSK is 355 HP / 355 lb-ft, costs $2820 plus muffler tips, at least +$500 more, and also comes with the warranty.

So what's up here, what am I missing?

Thanks.

Keep in mind that Dinan's way of measuring HP and TRQ is a little different (you can find more info on that from the Dinan rep in the B58 Technical Forum in the Dinan Stage 1 release thread - I would link it but not sure how, sorry).

With that said:

Dinan advertises 412hp and 438trq. These are at the crank not the wheel.

Dinan also measures the car's stock hp and trq prior to the tune and gets 381hp and 386trq, versus 320hp and 330trq BMW advertises. I'm not sure if someone has dyno'd their stock B58 but roughly the difference in the numbers accounts for about a 15% drivetrain loss. I'm being conservative however as the loss on new cars probably isn't as bad as 15%, maybe in the range of 11-13%...I digress...in any case BMW slightly underrates their cars.

With that in mind if you compare Dinan's 412/438 to MPPSK 355/379, it is likely that using Dinan's method to measure an MPPSK car you'll get numbers much higher than what BMW says (let's estimate +15% which means 408/436).

EDIT PS: I have MPPSK but am looking to get MPPSK compatible stage 1 when it is released I don't think you can go wrong either way but also you won't get much of a exhaust/sound benefit unless you upgrade that too with Dinan.