4-bar Fuel Pressure
4-bar Fuel Pressure Whats the most reliable way to raise the fuel pressure to 58 psi? Is there a factory style fpr I can use? Looking to go with smaller injectors but more pressure to improve atomization.
Aeromotive part # 13107. There is a 1/8' - 27 npt port on it that you'll want to block off properly. A number of guys have had fuel leaks (me included) and some even fires with this regulator using PTFE type thread sealant or Teflon tape. So it's gotten a bad rep. I ended up not needing to push my fuel pressure past 3 bar so I put the stocker back on. It was almost perfect between 43.5-44psi.
Permatex 80019 resists fuel so I use that on any threaded fuel system joins. This is the cure for leaks with this unit. Also works great with water jacket head bolts and trans pressure test ports for trans temp senders, etc.
Permatex 80019 resists fuel so I use that on any threaded fuel system joins. This is the cure for leaks with this unit. Also works great with water jacket head bolts and trans pressure test ports for trans temp senders, etc.
Because Aeromotive makes a good product. User error (me included) has led to leaking issues. I thought making that 1/8 port with an integrated o-ring would be a good idea back then. I set it aside for about 10 years. In the interim, I was fortunate enough to do some reading and found the right solution to fuel system plumbing with NPT and pipe components. Live and learn. I'll probably put it back on soon. I've been obsessing over accurate fuel metering and injector characterization lately. Dealing with millionths of a second differences, the math needs to be based on accurately measured and adjustable pressure. I've got some stuff on this over at gearhead-efi with Ford injectors, working on other manufacturers like Accel now.
I'm looking heavily at the FAST 36lb bumped up to 58psi. I'll be running a 396 with LE TFS 215cc heads and a 244/252 .614/.621 110 cam. You think that'll be too much injector?
That comes to 41pph at 58psi. Which is good for NA up to 650 crank HP at 85% duty cycle. Wild guess you're 540-550-ish flywheel with that combo. 35pph would do fine. The Ford M-9593-LU34A at 43.5psi might fit the bill. EV6 connector, would need EV1 adapters. Factory injectors are 2 5/8" o-ring to o-ring, Looking for dimensions but spray pattern on this Ford injector is 4-hole, same as my M-9593-BB302 30#ers, which are 1/8" overall longer than factory. The 34A isn't made anymore but they can still be had. I can generate the voltage offset and low pulsewidth adder offset tables for those at 43.5psi. Just not sure about the length.
LU34A calibration summary
LU34A calibration summary
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What makes those better than the fast injectors? Might sound like I'm arguing but I'm actually trying to learn. I don't know a ton about injectors. I'll be running a 24x kit and an 0411 pcm, if that changes anything
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Brett Foote I looked at the FAST 36s. Same style and spray pattern as the ones Bosch makes for Ford. What I don’t see (though I’ll look further) is a calibration sheet or whether they state that pph rating at 3 bar, 4 bar etc. a lot of makers state their nominal flow ratings at 3 bar (injector dynamics, FIC, et al.). HP Tuners to tune? If these are 36# @ 3 bar they’d be perfect. But no 2 injectors are the same even at the same nominal flow. If FAST can provide an accurate data sheet it’d be great. Some do have sheets specific to HP Tuners and other software.
That's definitely made by Bosch, their part # is 0 280 155 868. They rate it at 382cc / 35pph @ 3 bar. So that answers the nominal flow pressure spec. Supposedly a fair amount of data on them in the HP Tuners forum. They refer to it as the '868' injector. I didn't find a specific set of data for offsets and low pulsewidth adders but someone there may have it.
Is this the info you're talking about?
Injector Data Sheet: 280-155-868, 34 #/hr Skinny
Fuel Pressure: 44
Flow rate: 35.5 #/hr
Minimum PW @ 44 psi: 729 usec
Offset Compensation versus Battery Voltage:
6.4 Volts: 3105 usec
8.0 Volts: 2046 usec
9.6 Volts: 1521 usec
11.2 Volts: 1204 usec
12.8 Volts: 970 usec
14.4 Volts: 785 usec
15.0 Volts: 752 usec
Short PW Compensation versus Pulse Width:
0.015 msec: -192 usec
0.244 msec: -152 usec
0.488 msec: -109 usec
0.732 msec: -67 usec
0.976 msec: -24 usec
1.220 msec: 0 usec
1.460 msec: 0 usec
1.708 msec: 0 usec
1.950 msec: 0 usec
2.197 msec: 0 usec
2.440 msec: 0 usec
2.685 msec: 0 usec
2.929 msec: 0 usec
3.170 msec: 0 usec
3.410 msec: 0 usec
3.660 msec: 0 usec
3.900 msec: 0 usec
Injector Data Sheet: 280-155-868, 34 #/hr Skinny
Fuel Pressure: 44
Flow rate: 35.5 #/hr
Minimum PW @ 44 psi: 729 usec
Offset Compensation versus Battery Voltage:
6.4 Volts: 3105 usec
8.0 Volts: 2046 usec
9.6 Volts: 1521 usec
11.2 Volts: 1204 usec
12.8 Volts: 970 usec
14.4 Volts: 785 usec
15.0 Volts: 752 usec
Short PW Compensation versus Pulse Width:
0.015 msec: -192 usec
0.244 msec: -152 usec
0.488 msec: -109 usec
0.732 msec: -67 usec
0.976 msec: -24 usec
1.220 msec: 0 usec
1.460 msec: 0 usec
1.708 msec: 0 usec
1.950 msec: 0 usec
2.197 msec: 0 usec
2.440 msec: 0 usec
2.685 msec: 0 usec
2.929 msec: 0 usec
3.170 msec: 0 usec
3.410 msec: 0 usec
3.660 msec: 0 usec
3.900 msec: 0 usec
Post #3, here?
https://www.thirdgen.org/forums/diy-...bosch-iii.html
Just saw it there myself. I trust that guy. He designed the ECU in my truck.
I'd like to know where they stash their data sheet library...
https://www.thirdgen.org/forums/diy-...bosch-iii.html
Just saw it there myself. I trust that guy. He designed the ECU in my truck.
I'd like to know where they stash their data sheet library...
be careful because you can actually lock up the injectors with too much pressure, I’ve had that happening
I've seen several people say they got a little more power from going with smaller injectors and turning up the pressure so I'm giving it a go. I already have 42lb injectors but the cost difference between having them cleaned and flow tested vs buying new ones wasn't much more than $100