Fuel Delivery / selected through ownership
Calibrated
as one.
Tune, injectors and regulator, checked and matched by the same hands. The point was never the parts list. It was knowing the system works.
01 / THE STORY
Quality control is the part you can’t see.
Good parts are made all over the world now. Where something was made tells you less than it used to. What tells you more is experience with the product, consistency over time, and knowing the people who checked it.
That matters on an air-cooled Turbo. Parts that look OEM, some even shipped from Germany, turn up online and are not genuine. I want a chain of custody: who sourced the part, who tested it, and what it was matched to.
Todd at Protomotive tunes my car. Todd flows the injectors so all six deliver alike. He checks that the 3.8 regulator actually holds 3.8 bar, sometimes a hair more, and that the seals and the source are right. Tune, injectors and regulator are calibrated together, so the system is known to work. That was the purpose.
You pay for the time that checking takes. That is what I mean by inexpensive quality: the right part, verified, on a car I drive long distances.
02 / WHAT’S INSTALLED
Three parts and a tune.
- Pump
- AEM 50-1009 inline pump. Draws fuel from the tank and supplies more than the engine needs.
- Injectors
- Six Bosch EV14. Todd flows the injectors as a matched set of six. Each one meters fuel into its port.
- Regulator
- Bosch mini-style 3.8 regulator, checked by Todd. Holds 3.8 bar above manifold pressure and returns the surplus to the tank.
- Tune
- Todd’s calibration, written for these injectors at this pressure.
The pump moves the fuel, the regulator holds the pressure, and the injectors open for as long as the tune asks. The tune assumes all three are right. That is why they are checked together.
My earlier EV1 set flowed the same as the EV14s. The change was in how the fuel is metered and sprayed, with the calibration matched to it. On the road: a smoother idle, cleaner throttle response, better economy and a car that feels more dependable.
03 / THE DETAIL
For those who want the numbers.
- Pump
- M18×1.5 inlet, M12×1.5 outlet, 044-style body. Rated 400 LPH at 40 psi and 13.5 V.
- Electrical
- At 13.5 V, AEM’s current curve shows about 12 A at 55 psi and 14 A at 75 psi. The 3.8 bar base setting is about 55 psi; boost raises the pressure and the current with it. AEM calls for 13.5 V at the pump, from a typical 13.2–14.2 V charging system.
- Injectors
- Bosch 0280158123, rated 627 cc/min at 3 bar with n-heptane. The tune accounts for the 3.8 bar operating point.
- Sound
- The inline pump has an audible whine. Sound deadening helped in my installation without making it silent.
The pump figures are AEM’s, not measurements from my car. Next for the car is MaxxECU with a power-distribution module, with the original Porsche gauges kept. This fuel system is the foundation for it.
04 / FROM FLAT6 METHOD
What we offer.
The AEM pump is part of this collection; ordering is not open yet. The injectors and the 3.8 regulator are Todd’s work, so they come from him.