R56 What exactly does the sport button do?
According to a Road & Track article, which I also heard from a salesman:
Stiffens the steering feel and forces more exhaust through the turbo charger than normal causing about a 15-20 hp or lb-ft of torque increase.
With that in mind, it's recommended not to drive with it on for long periods of time because it's FORCING more than normal amounts of exhaust gases through the turbo. Forcing is generally not good. So to extend the life of the turbocharger, I wouldn't leave it on for more than a fun acceleration or pass on the freeway/track.
It sure does make it much more fun to drive!
Stiffens the steering feel and forces more exhaust through the turbo charger than normal causing about a 15-20 hp or lb-ft of torque increase.
With that in mind, it's recommended not to drive with it on for long periods of time because it's FORCING more than normal amounts of exhaust gases through the turbo. Forcing is generally not good. So to extend the life of the turbocharger, I wouldn't leave it on for more than a fun acceleration or pass on the freeway/track.
It sure does make it much more fun to drive!
regarding the Forcing word? i mean if they said it opens up allowing more air to flow through the turbo, would that rest a little easier?
i don tknow if it really affects the life of the turbo or mpg (unless of course you change your driving habits and drive a lot harder because of it)...but the truth is that it makes the throttle a lil more sensitive which for me makes shifting less tiresome, especially getting in gear......my only concern is, am i going to wear out the ps pump earlier on if i continue to drive with the steering that stiff......
"...it's FORCING more than normal amounts of exhaust gases through the turbo. Forcing is generally not good. So to extend the life of the turbocharger..."

That overboost would be more a danger to the engine (detonation) than the turbocharger ~ if extended for too long.
The ECU will allow, but limit this increase in boost (and power) at higher RPM to a very short (seconds) time period.
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Power Steering is Electric and Sport Mode makes it seem like it does less 'assist' than Normal Mode.
yeah id probably be more agreeable wtih this...but i dont think that the topic of overboost has anything to do with the sport button feature, cuz you can hit it with or without if you floor it through....just mentioning it causes people to get confused....
it's already been mentioned and proved (someone with scangauge and someone else with boost gauge) that with or without sport button enabled, you still get the same amount of max boost.
Last edited by mellowmcs; Aug 11, 2008 at 05:12 PM.
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