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[SgtB]

Hmmmm. That's an easy circuit.

[kgx]

that's what i thought too.

a differential amplifier with fuel pressure as the inverting input and a fuel pressure set point reference as non-inverting input would output a signal that would drive an average PWM controller well enough to maintain pressure under any circumstances. 5bar manifold-referenced fuel pressure sensors are available for most any late model ford (i got one from a focus for $10). datasheet here: http://rb-aa.bosch.com/boaasocs/;jsessionid=FED68DE6DCCDAC13A3E24B48FDD6F7A3.sundoro?template=page_product.vm&ccat_id=97&prod_id=564&lang=en

i had looked into this circuit: http://www.stefanv.com/electronics/escboth.html

simple, compact, very low on-resistance and pretty cheap depending on which FETs you use. my only concern lies in the uncertainty of the reliability of the shit that i design. it would put a lot less stress on the fuel pump, as well as keeping the fuel/pump cooler. no reason you couldn't run it off a higher voltage too, like 20v or something.

the other advantage is you could ramp fuel pressure with boost- like, add 3psi fuel per lb of boost like a rising rate regulator to give more topend fuel flow on more moderately sized injectors. the 044 pumps can handle the pressure.

[SgtB]

I was thinking a PIC, a pressure sensor, and some FET's. Do the rest in code.

[nock]

the arduino is my new weapon of choice for this stuff. i think using pwm.out, and two of the six analog inputs, you could do this with just a few lines of code. you could even add some potentiometers to the extra analog inputs, that way you could tune things around how you want.

[Phate]

the arduino is my new weapon of choice for this stuff. i think using pwm.out, and two of the six analog inputs, you could do this with just a few lines of code. you could even add some potentiometers to the extra analog inputs, that way you could tune things around how you want.

I was considering doing this with one of my older basic stamp boards I have laying around.  I gotta pick up an arduino to fuck with.

[SgtB]

the arduino is my new weapon of choice for this stuff. i think using pwm.out, and two of the six analog inputs, you could do this with just a few lines of code. you could even add some potentiometers to the extra analog inputs, that way you could tune things around how you want.

Haven't played with Arduino yet. I usually use a cheapo picaxe for simple slow stuff. I'm looking to mess with ARM. A X2 picaxe at 40mhz would be plenty of power for this. You could even do a look-up table with rpm reference, etc. Write a simple comm protocol and you can set it up just like a crome map.

[Joseph Davis]

the arduino is my new weapon of choice for this stuff. i think using pwm.out, and two of the six analog inputs, you could do this with just a few lines of code. you could even add some potentiometers to the extra analog inputs, that way you could tune things around how you want.

I was considering doing this with one of my older basic stamp boards I have laying around.  I gotta pick up an arduino to fuck with.

Funny you should mention one of those, HMT.Orgy has that on the first page of EM.