LC1 wideband tuning
 

What air/fuel ratio should I shot for when I tune my carburetor at idle, cruise, full throttle?

Re: LC1 wideband tuning
 

I shoot for around 13:1 at idle - the engine will have a happy place where it is stable. I try to just encroach on lean-instability

Cruise I ~start~ at 14.7:1. Sometimes you can go leaner, sometimes it's not happy with that. It takes time to blend all the cells together smoothly. What system are you using? If you add more timing, you can go a bit leaner.

Full throttle I shoot for about 12.6:1.

Re: LC1 wideband tuning
 

Thanks for the reply, I'm running the Innovate Motorsports LC-1. While tuning for Idle should I shot for a balance of highest vacuum and leanest AFR? Or just shot for AFR?

Re: LC1 wideband tuning
 

Highest vacuum will give you the most stable idle. Then see how lean you can go before the idle becomes a problem. Somewhere in-between would probably be fine. Tune the idle to what the engine wants.

I am running an LC-1 in a Lotus Super 7 replica, powered by a Corolla twin-cam, GSXR ITB's, Ford EDIS, all running off Megasquirt II.

I have almost all the parts to EFI my '77 Silverado....

Re: LC1 wideband tuning
 

These are an old set of AFR/VE/Spark tables for the Super 7 (they are NOT for a small block Chevy).

http://gwellwood.com/wordpress/wp-co.../11/MS-A12.jpg