I have been running about 8-9 psi or so with my vortech fmu for a month or two now, and my a/f ratio has always been pig rich @ around 10.8-11.3. All of the sudden in the last week or so my a/f ratios are now constantly in the 12.3-13.0 area. I thought this was very strange considering air temp and humidity, boost, and everything else about my car has not changed. BTW, this was all done with an fjo wideband. Can anyone help me out a little bit here???

 

How old is your fmu? Maybe you need to recalibrate it? Also, make sure the vac line going into the fmu doesn't have any leaks in it.

 

I tried to recalibrate it from A 6-1 to a 8-1, and it did not help at all. Also the fmu and all the fuel and vacc lines are less than 2 months old. I will check the vacc line with a pump when I get home just to be 100% sure. I just thought this was very odd since there were no changes in boost or air quality at all...

 

what injectors are you using? If its stock then use the 12:1.

 

I am using rc 310cc injectors with a walbro 255 lph in tank pump. I was using the 6-1 the whole time with no problems, other than running rich as hell. Thats when I switched to the 8-1 to see if it would richen things up a little, and it did not. Its kind of srange that my a/f ratios would lean out that much with no changes to the car at all...

 

i say try the 10-1 disk and see what happens.

 

Do u think the 10-1 disc would be to much fuel pressure??? I am trying to run 10 psi. That would be 100 psi of fuel pressue plus the static fuel pressure of about 44 psi, which would make a total of 144 psi. Any thoughts on how much fuel pressure is too much???

 

Just be safe and get a hondata s200b.

 

I am using an fjo wideband to street tune, so I always make sure she does not lean out on me...I just thought 144 psi of fuel seemed a little high... Oh hondata or aem will be in the works by winter time btw. I just got my car up and running a month ago, and I want to see how far I can get using the old school technology for now...