[Moserkm]

Did a search and found nothing. Then again, search isn’t showing anything at all even for “the” so I’m guessing it’s not working.

Anyone have any experience at high altitude that can tell me how 6-7k feet affects the performance? I know turbos are less impacted up here than naturally aspirated but curious to know some real numbers on 0-60 and 1/4 mile times at altitude. Thanks in advance!

Kevin

[M4Ghost]

Well less air, into the engine less performance.

[Alan l.]

Impacts are minimal because these cars are smart enough to increase boost based on conditions to give you consistent power. It’s been this way ever since Bmw went with force induction.

In the winter when the air is cooler and more dense the car will require less boost to achieve bits designed output. The opposite will happen in the middle of summer.

Alan

[Moserkm]

Originally Posted by Alan l.

Impacts are minimal because these cars are smart enough to increase boost based on conditions to give you consistent power. It’s been this way ever since Bmw went with force induction.

In the winter when the air is cooler and more dense the car will require less boost to achieve bits designed output. The opposite will happen in the middle of summer.

Alan

Right. Unless it’s electric, there will always be loss. It’s supposed to be 3% for every 1k feet. That would mean about 20%. I understand it’s not linear but that will get it in the neighborhood. 20% means ~120 hp loss. This altitude added about .6 seconds 0-60 to my SRT and it’s NA. Being twin turbos, I was figuring about 3% loss meaning 60hp down. But if these smart engines can compensate, it could be even less. Just curious if anyone on here has some numbers to confirm.

[Alan l.]

I use to do logs on my N54 twin turbo 335i and use to see max boost decrease during the winter and increase in the summer (+-3psi) with nothing else changing. Figure that car did it I’m sure the tech evolved even better now.

With that said when cars are being pushed hard in non ideal conditions you will reach its thermal efficiency limits sooner. Aka the ecu start dialing back power at some point.

Alan