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) why it makes any = difference if you have a regulator that tracks pressure, since you have to program = the EC-2 anyway. The EC-2 has lots of adjustment, but I'm guessing that you could run out room to adjust under worst case conditions. Without the pressure referenced regulator, you'd need to turn the mixture way down = at low power, and way up at higher power. Maybe you'd have enough = adjustment, and maybe not. You just improve your odds greatly by having the better regulator.=20 =20 As for your ram air system, if this only works in flight, as I imagine, = then you'll only be able to tune this in flight. You will have an idea how = close you'll be when you do the ground tuning. If you find that all your high power MAP's need to be enrichened a little, then the slight ram air MAP = will need to be enrichened a little also. You could also use the trick that Tracy mentioned for idle, where you widen the "window" of settings that = you calibrate with each push of the set button. When you "set" the highest = MAP that you can attain on the ground, you'll actually be putting the same setting in the next inch or two of MAP above that point. =20 =20 If you aren't familiar with the calibration routine, some of this may = not make sense. The bottom line is that it won't be a problem. =20 =20 Sounds reasonable. I initially set mine for 45psi, but there's an adjustment screw and know how to use it! However, my guage is really an = oil pressure guage and probably isn't sensitive enough for the accuracy = needed here. I'll wait for my EIS to set it more precisely. =20 =20 To be honest, I think I used an 80 psi gauge, and just took my best shot = at 43.5. You could leave yours alone if it's anywhere around that area, = and be perfectly fine. =20 Thanks for the lesson in fuel pressure regulators,=20 =20 Most welcome. =20 =20 Rusty (got brakes again, full fuel, 2 more degrees of pitch, and good weather for the weekend) =20 ------=_NextPart_000_00CD_01C38927.A1D226E0 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

I can see where that would be good, as long as the EC-2 fuel map = knows how=20 to adjust for the variations in fuel pressure. So, then the EC-2 = will=20 automatically adjust for my "poor man's turbo (ram air system)?

The=20 EC-2 doesn't monitor the fuel pressure, if that's what you're=20 asking. It expects it to be repeatable. When = you get the=20 unit, it will have the factory defaults in it, which should work = well=20 enough to get the engine running the first time. Once = everything is=20 working properly, you go through the entire range of MAP on = the=20 ground, from idle to full throttle. Along the way, = you calibrate=20 the mixture, so that it's correct for your installation. If = your fuel=20 pressure changes a bit along the way, it won't matter, as long as it's=20 repeatable. In other words, if your regulator is screwed up, = and=20 wallows up and down in pressure randomly, you're going to have = problems. =20 If however it always holds perfectly over most of the range, then falls = off=20 slightly at higher power, you'll be OK, because you programmed the = EC-2=20 under these same conditions.

You should=20 probably now be wondering (again <g>) why it makes any = difference if=20 you have a regulator that tracks pressure, since you have to = program the=20 EC-2 anyway. The EC-2 has lots of adjustment, but I'm guessing = that you=20 could run out room to adjust under worst case=20 conditions. Without the pressure referenced regulator, = you'd=20 need to turn the mixture way down at low power, and way up at = higher=20 power. Maybe you'd have enough adjustment, and maybe = not. You=20 just improve your odds greatly by having the better=20 regulator.

As for your=20 ram air system, if this only works in flight, as I imagine, = then=20 you'll only be able to tune this in flight. You will have an idea=20 how close you'll be when you do the ground tuning. If you = find that=20 all your high power MAP's need to be enrichened a little, then the slight ram air MAP will = need to be=20 enrichened a little also. You could also use the trick that Tracy=20 mentioned for idle, where you widen the "window" of settings that you = calibrate=20 with each push of the set button. When you "set" the highest MAP = that you=20 can attain on the ground, you'll actually be putting the same = setting in=20 the next inch or two of MAP above that=20 point.

If you aren't=20 familiar with the calibration routine, some of this may not = make=20 sense. The bottom line is that it won't be a = problem.

Sounds = reasonable. I=20 initially set mine for 45psi, but there's an adjustment screw and know = how to=20 use it! However, my guage is really an oil pressure guage and = probably=20 isn't sensitive enough for the accuracy needed here. I'll wait for = my EIS=20 to set it more precisely.

To be honest,=20 I think I used an 80 psi gauge, and just took my best shot at = 43.5. =20 You could leave yours alone if it's anywhere around that area, and be = perfectly=20 fine.

Thanks for the lesson in = fuel=20 pressure regulators,

Most=20 welcome.

Rusty (got=20 brakes again, full fuel, 2 more degrees of pitch, and good weather = for the=20 weekend)

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