Quote:
Originally Posted by amcpacer
I tried running lean with my 85 Chrysler Laser turbo by programming the computer to ignore O2 feedback and run lean under light cruising conditions. I have a LC-1 wideband readout. It would only function as low as 17:1 and anything leaner would cause misfire. I did however get best fuel economy running 16:1 at idle at hot idle and light cruise until +2 psi manifold pressure where it descends to 11.5:1 all the way to 19psi of boost.
I always wonder why this engine won't run lean like the rest of your guys engines.
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A cylinder head thats designed for power(being the car is boosted) guessing it has excessively large ports with poor low rpm flow and therfore low rpm fuel atomization, and also being boosted its probably low compression, which is another factor which makes firing off a lean mixture difficult..
My other car is a high 11 sec turbo civic, its low compression with a large aftermarket cam, and it won't fire a mixture any leaner than about 16-1.
Ben