100 cfm more with anular and downleg boosters can't beat AFR
I was downloading some AFR data (road testing the logger setup) with a jetting change and it led to looking at some older dyno data.
Long story short, the 750 cfm Holley currently on the engine was modified with annular boosters in the primaries and downlegs in the secondaries. However it never performed as well on the chassis dyno as it did with the plain ole '650'. Both are vacuum secondary 4150s.
After the 750 was modified, it ran very rich and its taken me a while (a long while) to get it pretty much in balance. I just leaned the main jetting a little more and was looking at the road results. It occured to me that the I might have a dyno run saved with 650 that had relatively rich AFR. If so, would it have similar power as the frankensteined 750 had when it was last on the dyno?
Sure 'nuff!
Just look at the AFR and power from 80 mph to 130 mph. Usually that's all that a dyno operator will capture and show you. (But I'm special and captured the shift. :rolleyes:)
I was downloading some AFR data (road testing the logger setup) with a jetting change and it led to looking at some older dyno data.
Long story short, the 750 cfm Holley currently on the engine was modified with annular boosters in the primaries and downlegs in the secondaries. However it never performed as well on the chassis dyno as it did with the plain ole '650'. Both are vacuum secondary 4150s.
After the 750 was modified, it ran very rich and its taken me a while (a long while) to get it pretty much in balance. I just leaned the main jetting a little more and was looking at the road results. It occured to me that the I might have a dyno run saved with 650 that had relatively rich AFR. If so, would it have similar power as the frankensteined 750 had when it was last on the dyno?
Sure 'nuff!
Just look at the AFR and power from 80 mph to 130 mph. Usually that's all that a dyno operator will capture and show you. (But I'm special and captured the shift. :rolleyes:)