Definitely not done with the pump gas tune. We're ironing out some of the fueling stuff up top that may be the reason, and the down low issues that others are having as well (slight delay). Most of the way there at this point I think, but need to get a bit more data. Should have it back on the dyno again in the coming weeks if the header gets here.
A cat free header is highly recommended. While we can dump fuel to cool things off, those stock units are sized for output, so if you're flogging it a lot then it won't hold up unless we do that. But if it just occasional use it will hold up OK I think.
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Originally Posted by regal
Are you done with the pump gas tune, does the choppiness on the dyno concern you? Any hope left to smooth it out ?
Also have you measured EGT's? With pump gas and no intercooler I would understand quite a bit of timing is pulled and fuel added, should we be concerned about the stock manifold cats. Would you say a cat-free header is mandatory with pump gas?
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