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Re: Is it worth the 400 bucks? (archive)

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Posted by Shawn Fogg on February 26, 2001 at 19:52:57:

In Reply to: Re: Is it worth the 400 bucks? posted by Stephan on February 26, 2001 at 18:18:37:

Stephan,

"Shawn, is there a way to see if the fuel mixture ratio is more enriched when you change from part throttle to say half? "

Yes... sorta... but it is difficult to be consistant. I can watch the O2 voltages anywhere but it is difficult to give the car exactly the same amount of throttle and watch the changes. At part throttle Jim can't really make the mixture a lot richer as the car is still running closed loop, he can just tune it to be as close to 14.7:1 as possible. (See below if you don't know what I'm talking about) What he can do at part throttle is optimize the timing and the acceleration enrichment which is basically an extra squirt of fuel depending upon how quickly the throttle is moving.

"My M can be driven at 2000 rpm in fourth
and when you give it some gas, it does not bog as it did before."

That sounds like an adjustment to the acceleration enrichment helping there.

Shawn



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