[G.Maro.ZL1]

Originally Posted by gtfoxy

I was going to comment that I bet you, like many, watched his stuff & got excited how cool it’d be.

Make no qualms, it’s an awesome build. Yet at the same time anyone not knowing the ins or outs of a pump gas turbo build would have next to zero understanding of the nuances that went into it. Little things that make a huge difference in a 416 strokes like that. Rod/stroke ratio, valve sizing, port flow rates & velocities, valve curtain & acceleration ramps, compressor & turbine side combination… the list goes on.

Someone might look at it & say “Hey, I could do that with a stock LT4 motor with more boost & fuel/octane.” Which is true, to a point, but it goes a lot deeper than that.

I’m not saying you can’t reach your goals. What I’m saying is it’s going to be a tad more complicated than slapping a dual 62mm kit on a stock LT4, even with port injection & making over 1K crank HP.


That’s great, in theory, but the compressors need to be able to flow the air, efficiently, at the manifold pressure required to deliver enough air mass to make the power you desire.

Add: Turbine combination playes a larger part in boost response. Wheel size & design, turbine housing A/R & design, Center section bearing usage, & as well as the exhaust system itself.

It’s a system, through & through, each part relying on the other to do what it’s designed to do in a given application.

With your knowledge, help me make this build work. I think it is definitely doable on a stock LT4 and I know it isn’t easy I understand you can’t just slap on turbos and hope you reach numbers. So list parts and pieces to help me build this up on a stock LT4, I know fueling is the priciest & biggest hurdle to overcome on these DI platform. What would you have in mind to make this work?