AFR readings not following table

For discussing B&G MS-I/MS-II set-up and tuning of fuel parameters (including idle valves, etc.).
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craigsGTS
MegaSquirt Newbie
Posts: 4
Joined: Sun Apr 06, 2008 7:51 pm
Location: san diego

AFR readings not following table

Post by craigsGTS »

i generated a table from the table calculator and imported it into the 12x12 in MT.
the lowest it shows is like 13.0 however the MT gauge shows that im at 10.9 and so does the NAW reader.
how do i get my engine to lean out a little and read correctly.

a have already calibrated using generic linear wb set to 0-9v and 5-19v.

i have "set" the linear wideband in config

that should be it for the WB as far as i know.

do i need to get an adjustable fuel pressure regulator to lean out or can the MSII v3 do this for my
85 corolla gts turbo.

im running 450cc injectors. everything else in the fuel system is stock.
san diego
rug
MegaSquirt Newbie
Posts: 12
Joined: Sat Aug 27, 2005 10:29 am

Re: AFR readings not following table

Post by rug »

You have to tune fuel with the VE table. The AFR table is for ego correction which by default only corrects up to 10% (I think).

/Carl
craigsGTS
MegaSquirt Newbie
Posts: 4
Joined: Sun Apr 06, 2008 7:51 pm
Location: san diego

Re: AFR readings not following table

Post by craigsGTS »

i have the egr disabled and egr is also unhooked on my engine.
is the fuel adjusted through kPa.
san diego
grippo
Site Admin
Posts: 286
Joined: Mon Feb 16, 2004 6:55 pm

Re: AFR readings not following table

Post by grippo »

As the previous post said, you get a match between your ego reading and the afr table by changing VE, which in turn causes the injector pulsewidth to be longer or shorter. There is no adjustment of fuel pressure. You can turn on ego closed loop control, but if you have just installed MS you should really tune it manually to get at least a rough tune and see how much fluctuation there is and how consistent it is from day to day. Also be sure to read all about the tuning process in the megamanual.
craigsGTS
MegaSquirt Newbie
Posts: 4
Joined: Sun Apr 06, 2008 7:51 pm
Location: san diego

Re: AFR readings not following table

Post by craigsGTS »

yes, ive been trying to read all about the tuning in the megamanual.
it just seems like you read 20 pages to get to where you needed to read.

right now im trying to calibrate my non GM IAT and get resistance readings.

i think having this in and working will help. but i will definite try your suggestions
as well.

thanks
san diego
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