letS4nicate

Acceleration feels normal until I hit 4000 rpm. At that point it feels like the car completely runs out of breath.
I'm in Boston and the humidity has been incredibly high over the last week or so. I tried a throttle adaptation and that didn't do anything.
Any ideas?

NASA racer

Yes, air density has a HUGE effect on the ability of the turbos to actually make the requested boost. Moisture DISPLACES air so even though it "feels" like the atmosphere is "dense", the AIR density is low and so there is just that much less air to compress and induct into your engine.

Shredster

...actually, the cool air is important to keep the engine at a moderate temp as higher than 'normal' temps can and will 'limp' the car.

letS4nicate

Does it make sense that it is more affected at higher rpm?

Shredster

the more you demand from your motor, the more it is affected by the variables that affect its performance.

4.2BURNS

I would think it is the other way around making the denser air/fuel ratio increase. Thus, making a bigger volume for the charge to displace within the compression chamber.

For instance water injection. These systems don't add Air / O2, but pure volume with H2O.

Just my 2 cents,

S4BURNS