Turbo compressor sizing

[motorman377]

Pros/con... thoughts. 2 liter turbo engine, MPFI.

Choice between; T04E w/2.75" inlet... 2" outlet or same compressor w/4" inlet... 2" outlet.

How does the TO4S compressor, w/4" inlet... 2.5" outlet, compare against the above?

These are to be used with a turbine a/r of .64.

Thanks for your thoughts/ideas.

Alan

[motorman377]

Stevieturbo... yes i'm aware of this.I wondered if there was/is any relationship between a turbos ability to draw air, with more velocity thru the smaller inlet, at the expense of some topend power loss. Would seem that as the engine takes its "gulp of air', it would be easier thru the smaller inlet.

Of course at the upper rpm range(s) the larger would be more efficient, but the engine doesn't run in that range for prolonged periods of time.

Kind of like airboxes that are very small, and offer there own form of restriction/ power loss.

Alan

[motorman377]

Actually what i'm trying to determine is wether the different size inlet(s) of the compressors, has any adverse effect on the actual air supply to the compressor. I know the compressor has enough flow to support the required hp necessary, but was concerned that the ductwork might be lacking. Realizing of course that the air in the ductwork can only be replaced at atmos pressure.

Thanks Alan

[motorman377]

Ok Stevieturbo & others, thanks for your input on this. Just one of a zillion "what if" questions I had rolling around in me head :>

Alan

[motorman377]

Oh my, what he said about my turbo! All I wanted to know was do I gain/loose power by using an inlet duct size of 2.75" vs. an inlet duct size of 4". Does the compressor "see" the difference in size, or does it not give a sheet!

Alan