@bosephbarking , good job, and actually, you forced my hand. However...(I think I'm reading your post correctly) a higher turbine A/R will "bring in power" later rather than sooner. The EFR turbos are pretty much state of the art at the time I'm writing this, not only because of the bearings, but because they use a lightweight "gamma ti" (titanium aluminide) turbine wheel. Combined with some other innovations they are best in class in friction, weight, and aerodynamics at this point.
When I started writing the "single turbo build" thread, the 9174 was under $2200. If you look at that thread, it is an incredibly good match for the ST engine. If you look at the compressor map of the 9174 and match it up to the numbers I posted here you'll see what I mean.
I haven't finished that thread, but bear with me for a minute- in my estimation, at least on a 93 octane, 30% ethanol pump gas, from the design of the ST engine- bore/stroke/GDI, I would estimate a 2.6 pressure ratio would be attainable. So look at the 9174 compressor map and the numbers I posted as stated above. I looked at scores of compressor maps, and that one was the overall winner. .
For anyone who can't decipher the math- it means you could have a single turbo ST on "pump gas" producing approx 550 WHP. And assuming you can provide enough fueling, that same setup could net over 700 WHP on e85, without taxing that turbo.
When I started writing the "single turbo build" thread, the 9174 was under $2200. If you look at that thread, it is an incredibly good match for the ST engine. If you look at the compressor map of the 9174 and match it up to the numbers I posted here you'll see what I mean.
I haven't finished that thread, but bear with me for a minute- in my estimation, at least on a 93 octane, 30% ethanol pump gas, from the design of the ST engine- bore/stroke/GDI, I would estimate a 2.6 pressure ratio would be attainable. So look at the 9174 compressor map and the numbers I posted as stated above. I looked at scores of compressor maps, and that one was the overall winner. .
For anyone who can't decipher the math- it means you could have a single turbo ST on "pump gas" producing approx 550 WHP. And assuming you can provide enough fueling, that same setup could net over 700 WHP on e85, without taxing that turbo.
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