Id say both are pretty good turbos and "could" support 9 sec power. The 45a has been 9's. I have little doubt I could run 9's with a 6265 on the engine I used in the MFS 6265 result thread. On e85 definitely. The engine will determine the mass flow potential until the turbo is all in. When people mention they went 10.0 with x turbo at x amount of boost it really doesn't mean shit when trying to compare to another car. The engine and air quality will be different on both and the way they are getting their pressure readings will vary. You'd need to look at the manifold to ex pressure ratio to know if you really can get a little more or a lot more out of it. I've gone 137mph with an old crappy cast turbonetics 66 cast at "only" 24psi boost. Well that's all it would make is 24 psi boost so the only part means nothing unless I'm switching turbos and increasing the boost . Fwiw I had a 6466 all in on an engine tonight and it hit backpressure extremely hard over 5600rpm at 29-30psi
Here's the evidence:
This is with single PAC alky and 83lb/hr injectors up to about 143mph. Note duty cycle. It was 90* and humid here today. The turbo can't maintain manifold pressure as rpm increases. The turbos compressor cover is inadequate in this application most likely. Ex pressure is very high at the current mass flow. It takes about 5psi on the gate to make 1psi more manifold pressure!
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