Leon
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HI Leon,
I stumbled on a post of yours from a couple years back on dyno results and was noting your AFR's. I have a L28, 500 lift, 300 duration cam, ported, flattops, etc and weber 45's. I've been trying to get the AFR's flatter, but it looks like yours has the same overall S shape to the AFR during the pull that I have. Is that "normal" for it to go rich, then lean out then a bit richer up top? Or did you do anything to flatten it? My lengthy thread is over at classic z cars...
https://www.classiczcars.com/forums/topic/56375-weber-selection-and-initial-jet-tuning/?page=13
I've basically not been able to flatten the shape out no matter what I've changed.
Thanks!
Ryan
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Hi Ryan, the problem lies in the emulsion tube. I did what I could with that setup, I believe the air jets were down to 110 on that graph in an effort to try to limit the amount of airflow through the e-tube which is part of the issue. I'm now running Keith Franck's VF tubes but haven't been back to the dyno. It should cure the fat dip that Weber tubes tend to produce. I used Keith's old jetting on my last Z and AFR was flat all the way across the powerband. I plan to dyno again "soon"...
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