How much does the a/f ratio effect the dyno tune? I know that's pretty much everything you're going for. But if it's off, how much does correcting it give you in terms of rwhp/rwtq?
I made 2 dyno pulls Saturday. I took it to have a chip burned to correct my problems. The first pull, it went off the chart within 50rpm (Yes 50 not 500) and never came back on the chart. I think that's when it pretty much started registering. BTW, the chart read down to 10:1. And this wasn't an "off" reading. With my combo and the way it was driving, this was overly obvious.
Then the chip was burned. The 2nd pull, it took ~200rpm for it to go off the chart this time. The pull only lasted just over 600rpm though because the car got real loud and the a/f reader went crazy. They thought I had blown a head gasket. It turned out that I blew a 4" piece of header gasket out and #3 and #4 were basically open head. They wouldn't do any more pulls because the header gasket caused them to get non-accurate readings.
So I only got 2 pulls in and he couldn't make any more changes to the chip. I was told it would take several pulls to dial in the a/f ratio. On the 2nd pull it picked up a little rwhp and >15rwtq compared to the previous run's peak numbers and this was at a lower rpm when it was obviously rapidly climbing before it was shut down short.
Anyway, after all that, the numbers still weren't too bad considering... So what kind of gains in terms of actual numbers or percentages could be gained by getting the a/f dialed in. Leaner's Meaner, right?
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