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Thread: Holley MPFI Sensors

  1. #1
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    Default Holley MPFI Sensors

    Hi, thinking on adding an IAT & fuel pressure sensor to my MPFI setup (as I have to order some stuff from Summit). Adding them allows me to log the values, which is useful and to output to the Digital Dash (for which I will be saving up my pennies for).

    Looking at the Holley docs, I can alter the spark timing based on intake temp. In the future, I'd like to use a PWM output to drive my fuel pump (via an SSR) to reduce the duty cycle of the pump to limit fuel heating. Could I use the fuel pressure as an input for this? Or is the only input for PWM outputs the engine RPM. Thanks.

  2. #2
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    Quote Originally Posted by BogBeast View Post
    Hi, thinking on adding an IAT & fuel pressure sensor to my MPFI setup (as I have to order some stuff from Summit).
    IAT/MAT Temperature Sensor: LINK
    Fuel/Oil Pressure Transducer: LINK

    In the future, I'd like to use a PWM output to drive my fuel pump (via an SSR) to reduce the duty cycle of the pump to limit fuel heating.
    Look into the new Holley VR1/VR2 Brushless Fuel Pumps With Controller:
    https://www.holley.com/products/fuel...in-line_pumps/ (Show "All" per page, and scroll down to end.)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  3. #3
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    Thanks Danny. They look great, but I already have a pump and those are on the pricey side for me.

    I've checked with the pump maker and they say the pump is quite happy on PWM (and they have tested the SSR that I'm planning in using). It's just whether I a can make the PWM output do the job.

  4. #4
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    Quote Originally Posted by BogBeast View Post
    I've checked with the pump maker and they say the pump is quite happy on PWM (and they have tested the SSR that I'm planning in using). It's just whether I a can make the PWM output do the job.
    As far as I know, a PWM electronic controller is required, to convert the PWM signal (from the ECU), into variable voltage to the electrical component (fuel pump, cooling fan, etc.).
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, M4602G aluminum driveshaft, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  5. #5
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    Quote Originally Posted by Danny Cabral View Post
    As far as I know, a PWM electronic controller is required, to convert the PWM signal (from the ECU), into variable voltage to the electrical component (fuel pump, cooling fan, etc.).
    They said I could do this as well, if I needed. The pump would vary its output down to 8 volts. I was gonna keep this as a backup option.

    I have a C6 fan controller coming from eBay to run my rad fans. So I will see how I get on with making that work with PWM, before I progress to messing around with the fuel pump.
    The more I look, the more I'm tempted to try different things. I think perhaps I should concentrate on getting the basic install working first. Thanks Danny (and sorry for the dumb questions).

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