Should my SAFC be reading a negative 465 mm hg?

bump

well, my safc would read between -500 and -470 mmHg usually at idle.

Yes. it's reading vacuum, negative pressure. get it?

Don't worry about the readings for pressure with the SAFC, they are probably not accurate as our sensor doesn't match up exactly with any of the "IN" and "OUT" settings for the SAFC. It doesn't matter what the numbers on it say anyway, it will work fine regardless.

actually thats just about right

here

Get a vacuum gauge and hook it up to the manifold vacuum port behind the throttle body.
Car warm, in park, you should get a reading of about 18 inches of vacuum/400mm or so
look at the pressure setting on your AFC
take that number ... say it reads like 464 mm
look at the vacuum gauge ... like 18.2 inches
here's the formula
inches * 25.4 = mm
so you take 18.2 * 25.4 = 462.28
you'd be almost perfect!
try it at 5 then 7 and see the difference

How about positive pressure? I read between +.014 and +.017 as soon as I enter into boost. Have the missing link, and am not experiencing fuel cut. Is this ok?

Originally posted by eclipse98rsHRC
How about positive pressure? I read between +.014 and +.017 as soon as I enter into boost. Have the missing link, and am not experiencing fuel cut. Is this ok?

Thats fine, its really just the setting you have for in/out
I used to get + values being NA. very low numbers but yes a little positive. everyonce and a while

Appreciate the info-what a relief! Thought I had the making of a serious problem. Still learning, thanks to you guys on these forums.