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post #13 of (permalink) Old 12-17-2011, 12:32 PM
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Location: Seattle, WA area
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Re: TTZephyr hits the track!

Yes, but your wastegates will compensate to run the same manifold pressure. It's the belt-drive superchargers that see the pressure loss without a pulley change, yet better power at the lower boost level. So, I would suggest dropping to 6-7 psig so you can re-tune to the new flow. You'll probably get to push timing up a few degrees as well with those heads, but tuning will tell. Check your plugs religiously on the return road if you have a pullout spot until you get dialed-in. Are you using more octane (fuel blend) at the track and 10 pounds or pump gas?


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