marcouvo

How far do you have to get into the throttle to get boost?

CaryBob

According to this it should be noticeable at 1,000 rpm and up to 6psi at 2,000 rpm. Is the boost chart in this doc what you're asking for?

LT4 Technical Briefing: http://zr1net.net/LT4TechnicalBriefing.pdf

marcouvo

Thanx for the chart CB.

Is there any boost actuated at partial throttle or only at full throttle?

If you get boost at partial throttle, about how much throttle? Like half throttle?

I never drove a super-charged car.

ChevyChad

Ive only ever driven centri style supercharged cars, but you definitely need to be mostly into the throttle to build boost, I'd say about 75% or more, otherwise, the bypass valve will vent all the extra air out.

CaryBob

Since its driven by vacuum as well as throttle, seems like it will vary with rpms. More throttle at low rpms, less at high rpms. And perhaps dependent on the driving mode as well.

NSTG8R

Thanks for the PDF.

Just looking at the details, the LT-4 is quite the motor. For the price, bravo GM.

JoesC5

Load on the engine has a lot to do with it, I imagine. It does on my Mercedes.