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89notch 06-25-2012 08:52 AM


Originally Posted by Griswald (Post 3716826)
are you running a rising-rate fuel regulator that increases the pressure under boost?

yes

Griswald 06-25-2012 09:04 AM

there will likely be a few chime in with that new information. I ran one myself and got rid of it 2yrs ago because I couldn't keep it consistent. What MEFI ecm are you running?

89notch 06-25-2012 09:13 AM

Mefi 3

Griswald 06-25-2012 09:20 AM

you should be able to get rid of that regulator and tune into boost with the Mefi3. Fuel pressure remains constant and I bet your sooting issues disappear, unless you are seeing oil as Eddie mentioned before

89notch 06-25-2012 10:41 AM


Originally Posted by Griswald (Post 3716849)
you should be able to get rid of that regulator and tune into boost with the Mefi3. Fuel pressure remains constant and I bet your sooting issues disappear, unless you are seeing oil as Eddie mentioned before

I did notice this weekend that the valve cover vents to the intake of the blower. I might route that into a catch can and see if that helps.

Griswald 06-25-2012 11:45 AM

that's a cheap vacuum pump and i doubt the cause of what you're seeing. if you're getting too much oil out of there you may have a blow-by problem

Let me ask you this...

does it soot on a run without going into boost? do you go into boost coming on plane?

89notch 06-25-2012 12:30 PM


Originally Posted by Griswald (Post 3716990)
that's a cheap vacuum pump and i doubt the cause of what you're seeing. if you're getting too much oil out of there you may have a blow-by problem

Let me ask you this...

does it soot on a run without going into boost? do you go into boost coming on plane?

Little to no soot not under boost. No boost getting onto plane.

Griswald 06-25-2012 12:55 PM

one of the pros can chime in but I would bet the rate at which the regulator comes in under boost is very aggressive. That in itself may lead to the sooting problem since your afr seems to be good. I ran one from Bell Engineering and although it was a superior product compared to the one ProCharger supplies, it was very temperamental and a real pita to to keep tuned. Day to day weather changes would affect it so I went to mefi4 and did away with it altogether. I'd be interested in seeing your fuel map with the 80lb injectors.

89notch 06-28-2012 07:29 PM

So what should my target air fuel be? Think I would be ok bringing it up to 11.8-12.0?

Griswald 06-29-2012 04:18 PM


Originally Posted by 89notch (Post 3719970)
So what should my target air fuel be? Think I would be ok bringing it up to 11.8-12.0?

That would be up to you. I run mine in that range but do not make extended runs at wot.


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