· COTM Winner
2014 Cruze Diesel, 2007 Cobalt, 1981 Camaro Z28, 2017 Volt
It's a tiny engine, so most of the time you're accelerating, you're in boost.
I had a boost gauge installed in my Cruze. You’re under about 3 - 5 psi of boost under normal acceleration. At WOT, it’ll get up to 15 psi.Hello fellow Cruze owners
Under what conditions does the 1.4L engine initiate and use turbocharger boost? In a properly functioning engine, when is boost mode activated?
Thanks in advance.
The wastegate/boost is controlled (through vacuum hoses) via a solenoid under the intake manifold. Boost pressure goes down as RPMs rise, but it doesn't stop producing it as you approach redline.Further to my earlier question, the waste-gate actuator is operated by inlet air pressure I think. The pic of my Honeywell Turbo after unboxing shows the actuator. The spring holding the actuator rod inward and thus waste-gate closed is pretty stiff, so there would have to be some pressure above which the actuator diaphragm pushes to rod outwards and opens the waste-gate to stop boosting at high (I guess near red-line) RPM, so I reason (probably incorrectly). At what RPM with WOT does that happen, if it happens at all?
(Note: I saw a video the other day where an engineer guy was saying the one should not put the hammer down and go wide open throttle until after the engine is at warm operating temperature. In a G1 LT with a 217° thermostat, that would be 217°F. )