How can we trick the car into running richer?

Now your making me wonder if I should go out and richen my car, but then I'm running an 8:1 compression ratio so I should be safe running my 14:1 at idle.

marlinspike said:

Now your making me wonder if I should go out and richen my car, but then I'm running an 8:1 compression ratio so I should be safe running my 14:1 at idle.

Click to expand...

When you get into the throttle you shoudl see that number drop. Lean cruise / idle is great ... just make sure the carb is setup up to deliver under full throttle the necessary fuel.

For Fuel injection it is not common to have 16:1-14:1 idle and 15:1-13:1 at part throttle.

Richard

Well, if on my car according to the service manuals if I have 14:1 at idle I have 14:1 at 2000rpm. It's funny actually, the only reason I'm lean (mechanic says their standard for this car is 13:1 at idle) is because of the richening at WOT. If I richen my idle to like 13.3:1 then I get better throttle response, but the WOT richening richens it too much and slows down my times. I can get better and better ET's by running so lean that it idles rough, but obviously that's not a viable option.