I'm going to re test the 2 044 pumps sometime soon. I need to figure out how much more flow I have now without the pre filter in line.
I also switched to both pumps always on, too much head pressure to have the in tank push through the inline. I would need to switch to a parallel set-up to allow proper staged pumps.
Good news is, my 255lph is working fine in another local SRT. I found the bypass pin pushed almost all the way out.
Pulled it apart and did the crack pressure mod to it. Loaned it out to help a friend out and it's reported working fine!
With a modified 255 in tank, you could feed a 044 just fine until about 75PSI.
On the older turbo dodges (think 86 down), the Shelby and GLH models had a small 'lift' pump in the tank, feeding a larger external Bosch pump. This arrangement actually worked great. The later cars went to a single Bosch in the tank, and even later models went to a Walbro in tank setup.
I love the mod here, my only concern is fuel starvation in the corners, and under hard braking. The fuel canister was really a pretty ingenious design, really. I am looking forward to seeing what your surge tank will be like. Great job!
A modified 255 will keep up with a 044 until around 75psi. Then the bosch just shines. Till about 120-125 psi where it tails off quickly.
The "modified" 255 is the crack pressure modification and the by pass valve "adjustment". It's an old DSM trick really, and it works great. The 255 will need to be fed a solid 12.0-14.4 volts to be effective after this mod, no if's and's or But's about it. It wil FAIL at 11.6V to push hardly any volume of fuel.
Now that thats out of the way, I did have a 255 fail on me. I was requesting a 70PSI base rail pressure and that may have done it in. IDKMIBFFJILL.
Thats how I got to the 044 to 044.
nemiro: I can see some evidence of starvation under heavy braking, this leads me to the Surge tank. I'm going to place it in the rear floor board on the pass side. Looking at a volume of 2.5-3gal with that space. This will provide the best overall fitting placement for the feeds and returns. As it stands, @ 1/8th tank I need to fill up or stay on the gas (grin).
Wow! That'll be a pretty big one. How will you handle the return line, and how will you keep the level right inside the surge tank (ie, it doesn't overflow)? Just curious. Keep up the good work!
Wow! That'll be a pretty big one. How will you handle the return line, and how will you keep the level right inside the surge tank (ie, it doesn't overflow)? Just curious. Keep up the good work!
Planned on running a free flow return to the fuel tank off the top of the Surge tank. With the Fuel rail return going to the surge tank.
The basic idea is the surge is always full and returning any "pressure" or overflow back to the fuel tank.
I do not even have a template for this thing yet. Just some idea on paper, and we both know how that actually works out when you try to DO it.
I'm open to advice and expirence also. This is not the NachO show.
Thanks for adding to the overall discussion tho, this will be handy to someone I'm sure.
Wow! That'll be a pretty big one. How will you handle the return line, and how will you keep the level right inside the surge tank (ie, it doesn't overflow)? Just curious. Keep up the good work!
im close to the same thing as nacho is doing, but mine will be ~1.2 - 1.5gal under the hood (where the battery is). going to run 2 inline 255's off of it. -6 feed to it from the pump, a -6 return from the surge tank to the fuel tank, -6 to each pump, then Y them together to -8, then from rail, i will have the FPR, then -6 back to the surge tank
Will you seal the surge tank to keep it from over filling and leaking everywhere? What will you use for the actual tank, a small fuel cell? If so, what configuration, and where will you place it?
Will you seal the surge tank to keep it from over filling and leaking everywhere? What will you use for the actual tank, a small fuel cell? If so, what configuration, and where will you place it?
mine is going to be made of box steel (no alum do to using E-85)
it will be welded, then pressure tested to make sure it has no leaks.
here is a picture of what i was working on before, it has changed alot from this basic drawing.
blue circle is for the inline fuel pump (purple) then it goes to the inline filter (red) to the rail
the light blue/green (ignore the one on the fuel filter)goes to the FPR, this keeps the surge tank full, insted of just having it return back to the tank.
the red circle is for the fuel pump feed line from the main tank
and the yellow / orange is the overflow line back into the main tank
so it should work like this
fuel pump in the tank pumps the "surge tank" full of fuel. once full, the overflow line will just put it back into the main tank, leaving very low pressure (should be ~1psi or so). the returnline feeds back into the surge tank, so that the big pump doesnt suck the tank dry by outflowing the smaller intank pump.
im going to adjust the size of the tank vs how much fuel i would need to stay WOT for over 3 min, without being filled from the main tank.
it will be placed in the stock battery location, im probably only going to do ~4 inches high so i can fit a 4inch intake over it
The purpose of ignition advance is to account for the lag time following spark ignition for combustion pressure to peak at 15 degrees AFTER TOP DEAD CENTER. A little fyi !
mine is going to be made of box steel (no alum do to using E-85)
it will be welded, then pressure tested to make sure it has no leaks.
here is a picture of what i was working on before, it has changed alot from this basic drawing.
blue circle is for the inline fuel pump (purple) then it goes to the inline filter (red) to the rail
the light blue/green (ignore the one on the fuel filter)goes to the FPR, this keeps the surge tank full, insted of just having it return back to the tank.
the red circle is for the fuel pump feed line from the main tank
and the yellow / orange is the overflow line back into the main tank
so it should work like this
fuel pump in the tank pumps the "surge tank" full of fuel. once full, the overflow line will just put it back into the main tank, leaving very low pressure (should be ~1psi or so). the returnline feeds back into the surge tank, so that the big pump doesnt suck the tank dry by outflowing the smaller intank pump.
im going to adjust the size of the tank vs how much fuel i would need to stay WOT for over 3 min, without being filled from the main tank.
it will be placed in the stock battery location, im probably only going to do ~4 inches high so i can fit a 4inch intake over it
NICE!
My only question would be the location. Why have the surge tank in the Engine bay..? Wouldnt it be better to have more near the rear tank and pump locations?
My only question would be the location. Why have the surge tank in the Engine bay..? Wouldnt it be better to have more near the rear tank and pump locations?
it could be made to fit under the car, and be just like Ragetek's surge tank.
i figure, closer to the engine bay, the less pumping losses the better (and i dont have the spend a fortune on -10 fittings and lines if i go that route), albite i will have to deal with more heat. i will probably make this up this winter and will have it more figured out by then.
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