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Well you're right about WOT. The vacuum rise at WOT is very small especially with a four barrel. I didn't think of that.

Oh I think the throttle stop idea has potential. Its a different approach but not wrong. My thought for doing this type of testing on a dyno was similar. The dyno would need a load on it. My best low speed testing (idle circuit) was very gentle accelerations from dead stop holding the throttle steady.


One thing which might be a problem with the throttle stop idea is that at the same throttle position you can't put different loads on it.
A hill would give more load options, but we're kind of short of them here.

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Does the Urich version with FI still have the section on Road Race Tuning?



I think it does, but I'll check when I get home.

383B, 9.8:1, Lunati 60302(220/226@0.050 262/268Dur, 0.475"/0.494", Stealth heads, Performer manifold, QF SS-750-AN carb, 3.31Diff, A833 4-speed manual.