How to tune air fuel ratio.

Ok I need help on tuning my car. I have the Ford falcon wagon with the Paxton supercharger. Well I have a 650 blow thru carb. The jets on the primary are 74 and the rear is 78. When I am at idle it is 14.7 to 15.1. when I Cruse the car at 55 the a/f is 10.8 to 11.3. so if I go down two jets sizes, will my a/f go up to 11.5 to 12 .5. thanks for your help.

AFR = lambda x stoich, always




"https://www.aa1car.com/library/air_fuel_ratio_chart.jpg"



"https://www.theturboforums.com/attachments/lambda-jpg.512459/"

https://www.youtube.com/watch?time_cont ... zbLrn-2jyw
[bbvideo=560,315]https://www.youtube.com/watch?v=JzbLrn-2jyw[/bbvideo]
"https://www.youtube.com/watch?v=JzbLrn-2jyw"


161 Henry is the man to follow. Don't go too lean is my message, and don't forget that ignition timing influences vacuum, and vacuum influences air fuel ratio.

Focus on perfect low total advance first, then set afr.


just so you know

Your managing knock, advance and Air Fuel Ratios. Like a discordant band of thugs.

https://www.youtube.com/watch?edufilter ... Jx2RqwYBNE

When you are cruising you are only using the primaries so you would want to go down 2 on primary main jet size.

What is the WOT a/f ratio under full boost?

I went down 2 jet sizes .the jets size is now 72. And now at 55mph. It is at 10.9 -11.4. still a little Rich. Should I play with my idle bled screws. Or go down 2 more jet sizes.

There are six screws on a blow through Demon that adjust the idle so I need more info.

Is the air/fuel still around 14 to 15 at idle?
How much throttle does it take to do 55 mph?
What is the manifold vacuum at 55 mph?
Are all 4 idle mixture screws turned out the same?