Nice, but i will stick with my BAP. Jack loves to push the envelope though. 
Most in-tank setups dont have any type of surge tankā¦ you are lucky to get a cheazy basket around the pump.
A swirl pot serves 2 functions. It removes any air from the fuel lines and provides a buffered fuel supply. If fuel sloshes away from the tank pickup and the fuel pump puts air into the lines that would have disastrous results under high boost/load conditions. The air pockets in the lines would starve certain injectors of fuel and create a nasty lean condition. It would not last very long but it takes seconds to blow a motor from going lean.
The swirl pot accumulates a quantity of fuel and this keeps the pressure pump submerged in fuel at all times. The pressure pump will always be picking up clean fuel with no air bubbles and no interruption to flow. It works very well do remove any air from the fuel as well.
I could do that but I feel this layout is much more robust. You cant just say that Twin 255 Walbros are good for a certain power range. Under boost things change drastically. A pump is rated at a certain amount of flow at a given pressure. That flow drops off dramatically as you increase the pressure.
Injectors may need 50psi of fuel normally but under 20psi of boost the pump needs to produce 70psi of fuel pressure. Here is where you lose major flow This is also when you need the fuel supply to be the most reliable.
Who cares what the thing flows at idleā¦ meaningless.
Looks like a sick setup, how much HP you plan on making?
did u do any of this yet? hows the project comming?
any new pics
Nice setupā¦ But if I told you how I handled the surge tank in my situation, Iād have to kill you. :snky:
Certifiable 250 GPH @ 60 PSI 4Lā¦that is immune to both cornering Gās, lateral Gās, fuel overheating, and excessive pump noise.
Just curious- where did you get the ATL pick-ups? Do they make anything by the way of oil system pick-ups?
very interestingā¦ I like it jack. since fuel starvation is obviously your biggest issue are you also going to wire in a dummy light/sensor in the swirl pot to give you shut down time if that becomes starved? it would suck to go all out to that point only to realize your feed to the swirl pot is not enough or that your supply pump failedā¦
also on a start up are you going to have to wait an extreme amount of time for your fuel system to become charged before actually cranking the motor over?
good luck
fuel system seems a little over kill. I think that the fuel cell, with a 255 in the cell, and another 255 close to the fuel rail with a 5v relay connected to tps for extra consistant fuel pressure at wide open throttle.
megasquirt is an excellent choice especially when it comes to the pocket book. We almost have it figured out for the bmwās 6 COP ignition system so we can use our stock crank trigger wheel running wasted spark so a cam wheel wont be necesary. But thats a whole nother story.:snky:
Welcome to my world. That is the EXACT issue I had to engineer around. While i appologize on not being able to spill the beans on a fix, think about it long enough, it WILL come to you. However, when it does, capatalize on it- I am. You would be surprised at the SIMPLE fixes that have thus far been overlooked. The OEM Viper surge tank is very similar in function OEM to what your aftermarket one is like now. It is a dual stage Walbro 255, used for both filling the reservoir and pumping to the engine. The problem is, it can only fill at a ~500 HP rate. Take a 1000+ HP engine down a standing mile, and COUGH out of fuel, out of luck. The big tuners have struggled with this problem, as there is no āapparentā fix. For the 1/4, its fine, as you dont need a lot of fuel for more than that short duration. The problem manifests itself on the circuits in cars running big power/fuel systems on long stretches. If you plumb into the surge tank, there is a limited quantity uninterupted fuel supply, and if you plumb into the tank, you have a quite interuptable unlimited full flow fuel supplyā¦each has its benefits separately, I found a way to get both. Try taking a car around a road course with a tank wall mounted pickup for drag racingā¦ it will have issues before you can say āTurn 1ā.
Why make a post saying you solved the problem but not be able to help others solve the problem but keep it a secret?
Uhhh, because he is planning on selling his idea? Got a problem? too bad.
98 Red EX hit the nail on the head. I cant very well make money on something I give away for free. I am just letting him know there IS a fix for it if he puts his brain into gear long enough to figure it out- if he is even concerned about it in the first place. If he strictly has a 1/4 mile car, or a car that will not make more horsepower than the fill pump itself can supply at Zero PSI, then he doesnt have an issue to begin with. I was more answering the commentor I quoted, not the guy who built it. Believe it or not, the answer is indeed in this thread.
I just went and took a closer look- that setup HAS the detail I am refering to, but just in a way-too-complicated manner. I produced everything as a single package to accomplish the same thing. Among other things, Instead of 3 pumps, I have 2. One internal, one external- No, not inline. They both have different purposes, one of the many details that make this fuel system a sure-betā¦the flow of a race system, and the noise level/fuel heating of OEM. How they work and are fed is the key here. One is constant, one is variable speed and fully mapped to the EMS. (I also think I may be the first to do thisā¦cause I sure as fuck cant find anyone else that has, let alone even the parts to do it! I had to design EVERYTHING.)
Granted, this style surge tank probably is unique to Vipers, as I have never even heard of a dual stage Walbro outside the Vipers, let alone seen another one. It could be implemented into another car type I am sure, but it wouldnt be easy. For a balls-out redesign, it made is easier, lighter, and smaller in the endā¦but for a general hobbyist or a āmedium rangeā system, it is quite the pain in the ass and overcomplicates everything. glad I went balls-out.