The stock injectors will be more than sufficient for where you're at right now.
All of our testing was with stock injectors. now that we have a proper fueling solution, we want to find out the limit on all of these items, and then figure out the limit of the next roadblock, and then the next
Purple line is what Fuel Pressure ECU want the Fuel Rail to Hold. That is the target it is shooting for. ECU drives the pump as hard as it can but you see the green line, it doesnt get near the target briefly. It doesn't have enough flow to build pressure in the rail. On the bottom graph, the fuel pressure hits the target without a problem. It shows that the pump is capable of generating 2800 PSI when demanded.
Very nice. When can we buy one?Charts are up!
Stock EcoBoost fuel pump with e85
Livernois Motorsports EcoBoost HPFP with e85
It is hard to say what 2800 psi signifies but the relationship is definitely there.
I'm not a technical expert on this but this is what I've gathered over the years of driving DI cars. If the injectors need 2000PSI to hit the fueling target the motor needs and the pump can only output 1300PSI, you get extreme cylinder temps and catastrophic detonation. This was really bad on early Mazda DISI engines, and why they tune them to run pig-rich these days. People were blowing them up trying to pass on the highway in 6th gear because the pump could not meet demand, let alone when modding. The very first mod I did on my MS3 was an upgraded HPFP piston which allows more displacement. Its cam driven, and you can't really get more duration out of it so increasing the displacement of the pump is the only way to get more fuel into the rail.
). So how much power can the pump actually support with the stock injectors?Hey everyone, sorry for the late reply, we have been getting hammered with inquiries on this (Not a complaint, trust us
So, what the graphs are showing is commanded fuel pressure versus actual. As you can see with the stock pump, the computer is requesting a fixed pressure value, that when stock, is more or less, easy to achieve. When tuned, it makes it more difficult to achieve that number as extra power requires extra fuel, and it can no longer deliver what is needed. Add in E85 (of any mixture) into the system, and it just becomes more and more difficult to achieve. In the case of these graphs here, at full E85, we actually had to run less power and boost just to be able to not have catastrophic failure with E85, but as soon as we put our pump on, it was able to keep up with demand, and put power back into it.
Now, we have found the limit of the injector, so we will be working on that next, so we can confirm that the pump can definitely out perform what the injector is capable of.
Now, as for purchasing these, we plan on being able to ship these out in the next 2-4 weeks.
I hope the ship time is sooner rather than later. I need this in my life like yesterday!