Quote:
Originally Posted by TurboNova
Put an engine on the dyno sometime with 8 O2 sensors and play around with regulator placement and you will see why.
Even with running the regulator in the front and looping the rails can show as much as 1 AFR point from side to side.
What stops the fuel from just bypassing the fuel to the tank insead of going to the engine? It will follow the easiest path.
There are other ways to dealing with hot fuel than bypassing it in the back.
bypassing in the rear works for a low performance engine but when you start to get something that really needs fuel flow it will not work. You will end up with burned valves and or broken pistons.
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I've done a few 700-850+ rwhp cars with the regulator in the rear. Haven't broke one yet, and I'm not afraid to drive them hard. I had one that broke after I sold it, but that wasn't due to a rear regulator; that was nosing it over with an EFI tank that wasn't baffled well enough to work at 1/2 tank or lower with the acceleration of that particular car. Those were boost referenced though, so you'll be happy about that.
My Cobra was n/a and had a front regulator, but still no reference line. Ran fantastic. All of these cars had O2 bungs on both sides and the sides were always within a couple tenths in A/F; nowhere near a full point difference. That was with comparing the computers wideband to the in-dash wideband gauge, to the handheld Innovate.
As far as fuel taking the path of least resistance, it seems like you'd see the pressure issues on a gauge. I have the gauge on the rail, and on the regulator, and I am not seeing any movement, fluctuation, or dropping pressure on mine.Seems like the regulator is working fine if the pressure is dead steady, a/f basically match side to side, and the car runs great. I do not doubt what you've seen, just that I do check and don't see it on mine. A/F differences from side to side can be due to heads, intakes, etc. as you know. Interesting that you've seen a difference with just moving a regulator. I've just been doing it a different way and my stuff runs good and doesn't blow up. And I never do a mild engine................
Again, it's just the "must" wording that I cannot agree on.