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As has been said a number of times on this board, the only useful comparisons a dyno is really good for is A/B of the same car on the same dyno (preferably on the same day).
But even so, a 30% drivetrain loss figure? That's double the already-generous (commonly-used) figure of 15%. But the 15% figure would put you right at 200 crank hp. Did you dyno it before the mods?
Hopefully, an expert will sound in with some analysis of the A/F ratio.
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