Quote:
Originally Posted by SprayedBigCube
Agreed. I wonder how much wiggle room there is from the EPA friendly exhaust timing that could be recovered. Toyota must have really yanked on it alot to create a large lobe separation angle for little to negative overlap.
I assume if you're tuning in speed density, you've either got a real VE table or god forbid (as GM has recently done with Gen IV ECUs) an inferred (from parameters) VE table. How bad are the midrange VE numbers looking? Can you post a screen shot?
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The Hydra gives you a number of options now for fuel tuning but I'm a purist and tune straight injector pulse width.
The exhaust cam must be fixed to open extremely late so if you use no exhaust cam timing you lose about 25 hp up top. You can get the exhaust cams to move fully/reliably at about 3000 rpm. You just can't get a perfect blend between the exhaust and intake cams to eliminate the dip.