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Message: [QUOTE="mikeeg02, post: 1434368, member: 24194"] I think the answer to that is the compressor wheel being a 66/88 vs the stock 60/80 (IIRC) and retaining the same turbine side. Same exhaust side with a bigger compressor wheel, and BB to help with spool up. So I would expect with stock injectors that the stock turbo was capable of almost utilizing, the 38R in the same situation, same tuning could yield Less peak boost. Much like with smaller injectors capable of making 35psi out a 364.5sxe I'd expect to see them with a 369sxe achieve less boost. Same exhaust setup, and not enough fuel to drive the compressor. Unless the turbo changes the volumetric efficiency of the engine, the restriction in the heads is why boost pressure is created. The only difference between two turbos in the same situation, same conditions, same psi, is the density (or temperature at the same psi) of the charge. Which is directly related to lbs/min of air. I believe that's why turbos are rated in lbs/minute as opposed to cfm, because to calculate cfm, you need to know the engines VE at that rpm. Please correct me if I'm wrong. Being able to achieve smoke free 15psi at 1500 again was to demonstrate spool up characteristics. As many know,(and from what I've read) the old box 366 was a bit of a turd until you put a billet compressor wheel, and comp housing or whatever else you had to do to achieve decent spooling. [/QUOTE]

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