efi mixture settings

[JShadzi at aol.com]

Alan, IME, tuning for a NA motor I shoot for 13:1 under WOT, under idle and light load shoot for 14-15:1 a/f ratio, but w/o a wideband trying to shoot for anything other than "it feels good" will be next to impossible w/o actually knowing what your a/f ratio is, via WB.

Also, IME, tuning with Batch fire, you'll have a tough time getting the car any where near stoich at idle and light load conditions, you'll likely have to run closer to 12-13:1 to keep the car running smoothly.  The only redeeming factor is going with smaller and smaller injectors, I'd say for the power levels you're looking at, you should be fine with no more than a 20lb injector, not sure what you'll be using, but with batch fire, the smaller the injector the more control you'll have.

Running 034EFI Stage II with sequntial injection, I have no trouble getting idle right at stoich even with 50-60lb injectors, but that was never possible before we went to full sequential.  I'll be running a 75lb injector for the 2.3l 20v project, no problem there either.

HTH, keep us posted, BTW dynotuning is highly recommended.

Javad

>Ok....
>I am still working on my megasquirt project for my 90q.  
>Just wondering if you other efi guys have come up with a nice safe
>stoichiometric value for the na 5 cyl engines (9.6 cr on my frankenmotor).
>Ie 14.7 being stoich, while a value of 13 could be best for power, but
>between the 2 is a nice safe value that the 5 cyl engines will like.
>Any btdt?
>Just out of interest....
>
>Best Regards,
>
>Alan Pritchard,
>Mechanical design engineer,
>Network administrator.
>
>Seaeye Marine LTD.
>+44 (0)1329 289000
>www.Seaeye.com
>
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