TUNE TO WIN-A/F vs TIMING
In fact in my experience, the most time is spent early on when getting into the ballpark for both. Because they have work together, a big change in one sometimes means some adjustment in the other. So that can be a lot of back and forth. Once they are close, especially the timing, then stepping toward the best mph in the 1/4, or area under the curve on the dyno, becomes pretty straightforward.
OK. Why did I say 2% ? Because 5 hp gain on 250 hp is about 5% and that's roughly what I've seen for changing a pair of jets two sizes jets.
For highway driving I don't have a way to measure the gains in part throttle fuel consumption, but when its just a jet or two over the edge on the lean side the engine will rev up and die when the boosters take over. That's uh, I don't know, I guess 100% off!
That's the difference in what I'm saying. Its not that much harder to get it much closer. For wide open throttle power, the effect of changing fuel restrictions is relatively easy to observe until we get to within a jet size or two. The high effort is only to obtain the last 2%. For timing at WOT, I'll grant there is more effort for the last 2 to 5%, in part because its more dependent on engine conditions (how heat soaked the engine is).
In fact in my experience, the most time is spent early on when getting into the ballpark for both. Because they have work together, a big change in one sometimes means some adjustment in the other. So that can be a lot of back and forth. Once they are close, especially the timing, then stepping toward the best mph in the 1/4, or area under the curve on the dyno, becomes pretty straightforward.
OK. Why did I say 2% ? Because 5 hp gain on 250 hp is about 5% and that's roughly what I've seen for changing a pair of jets two sizes jets.
For highway driving I don't have a way to measure the gains in part throttle fuel consumption, but when its just a jet or two over the edge on the lean side the engine will rev up and die when the boosters take over. That's uh, I don't know, I guess 100% off!
