Hy Octane

As we continue to try and diagnose what the hell is affecting my motor, my SM asked me if anyone else was reporting these symptoms..
So, have any of you noticed an unexpected reduction in boost while driving your beasts? If so, please explain..
Thanks!

DaveyKid

Unexpected? No. Expected with higher temps? Which one, engine or outside temps? Engine, no.

Hy Octane

Yeah.. I guess just any loss of boost that might have occurred and what were the conditions like etc

Kimchee

Hi temperature?.. well there's always heat soak

ICONCLS

Can do it consistently if I wind the car out too much and for too long at the track.

jatwrite

I'm no tech but have read that turbos like cold, dense air. All three of my Audi turbo cars have performed better in cold weather than hot.

PaulW

The turbo can still make excessive boost in high temperature situations, but due to the higher ambient temperatures, the engine is much closer to detonation at a given boost level as compared to a lower ambient temperature.

Detonation occurs somewhere around 1075 degrees absolute, which is a a combination of ambient temp, heat created due to compression in the cylinder and heat created from compressing the air by the turbos. That's why a more efficient intercooler is preferred, it keeps your charge air cooler.

Therefore, the ECU see detonation earlier in higher ambient temps, so it backs off boost or retards timing.

jc

But i can't 100% attribute it to heat, vs the car just really being in the wrong gear.