Motorgen - Automotive Events, Meets, Cruises and Forums - View Single Post - How can a carb be tuned off of an engine?

TimAT · 08-22-2009, 03:10 PM

Even with the carb ON the engine it's going to run with there are too many variables. Air temperature, humidity, air density, and fuel quality just off the top.

Trying to get the A/F ratio 100% perfect in all conditions is asking a lot. IMHO, it's not going to happen. Just get it close as possible for the 70-80% of the time for the conditions the engine will be run in and let it go. If you're going for all out racing, then tune for WOT, cruisng, then setup for midrange. with it fat enough it won't get too lean for that occasional WOT blast.

Digital FI is a great thing since it constantly adjusts the A/F for the best mixture, but it's still not going to keep it EXACTLY at the optimum at all times.

08-22-2009, 03:10 PM	#10
TimAT Senior Member Join Date: Dec 2008 Posts: 123 Tweet	Even with the carb ON the engine it's going to run with there are too many variables. Air temperature, humidity, air density, and fuel quality just off the top. Trying to get the A/F ratio 100% perfect in all conditions is asking a lot. IMHO, it's not going to happen. Just get it close as possible for the 70-80% of the time for the conditions the engine will be run in and let it go. If you're going for all out racing, then tune for WOT, cruisng, then setup for midrange. with it fat enough it won't get too lean for that occasional WOT blast. Digital FI is a great thing since it constantly adjusts the A/F for the best mixture, but it's still not going to keep it EXACTLY at the optimum at all times.