Being my air/fuel ratio on my last dyno test is running around 11.6 - 12, is this detrimental to getting good HP? My HP peaked (275.2) at 5600 rpm with the ratio at 11.6. The torque peaked (327.1) at 3800 rpm with a ratio of 11.5.

You might not get a lot of additional horsepower, but your part throttle driveability will improve. If you're rich at WOT, you are probably a little rich at part throttle.

The best (and Cheapest) way to get your jets set right IMO is to go to the track and make some passes. Don't worry about the ET but look at the MPH. Try a step leaner in front (2 numbers) make a pass and see if the MPH changes a little higher. If it goes faster, go down 2 sizes on the secondaries and run it again. When jet changes don't make the car any faster go back to the last set of jets that made the highest MPH.

The car should run fastest with an AF somewhere around 13.0:1. Different cars vary somewhat so that's just a ballpark number.

I recently did some carb tuning on the dyno with my 302. By moving the average A/F ratio from 11.5:1 to 12.5:1, I picked up 10hp at the wheels.

But you're in the ballpark.... For best HP the guideline is 12-12.5:1 (this should be your full throttle a/f ratio). For economy (during part-throttle, light load) you want to be in the stoichiometric region (right around 14.7), or maybe just a little richer. I'm sure there's more comprehensive material out there on tuning with an a/f ratio meter. (Maybe check the related thread in this section, or the engines section - there might have been something there.)

http://www.mummbrothers.com/SRF_Stuff/images/Stoich.gif

Max power is around 12.6, best mpg is around 15.4.

http://www.mummbrothers.com/SRF_Stuff/images/A_F%20Ratio.gif

It is much more costly powerwise to be too lean than too rich, as the lean side of the curve is steeper than the rich side.

For the rest of the story:
http://www.mummbrothers.com/SRF_Stuff/Secrets/Driveline/Air_Fuel.htm

Great info! Now with that in mind, is there a system (gage plus probe) that I can add to my car that will accurately monitor this ratio?

Mr.G Do we have a deal for you!!!

http://www.camaros.net/forum/ultimatebb.php?ubb=get_topic;f=4;t=007335

Jim

Help me out here. How do I get this sytsem to work on my '67 w/zz3 engine?

You just have the muffler shop weld the included bung for the O2 sensor on your exhaust. (cost maybe 10 bucks) Then install the O2 sensor (after reading the included manual) Then all you do is tune the engine to the best air fuel readings. First adjust the idle mixture screws then the primary jets, then the secondary jets. (an easy proceedure with most carbs) This is all done with the meter in your hand (or your passengers) after the carb is setup, you will be getting the most power or economy or a combonation of both, that you want. If you were to have this done by a dyno shop it could cost close to what you would pay for this meter alone. And you still have the meter for future use, or set up some friends cars to offset your cost. Go to the site and click on support. http://www.innovatemotorsports.com/
You can download the manual and have a look. But hurry!! we need another buyer to complete our discount number! Any more questions, just shoot!! Someone will get back to you with an answer.
Jim