Challenger Drag Pak Owners

[Chris "drooze" Wertman]

Check and I understand all that, on the cars (vs their Street cousins) I can adjust my supply pressure with a regulator after much finer than in a closed loop system, there I need to modulate the pump (as the St units do) to maintain a constant pressure.

That was why I was curious as to how hes modulating the pump for contant and steady pressure, obviously a WOT burst will cause a drop in the line pressure, then the electronics have to say Oh **** run the pump, there is a delay and a POTENTIAL for inconsistent pressure.

Without being able to bodulate and control pressure exactly your not going to be able to gain constant and reliable atomization when these (the SRT 4) injectors atomize best at a given pressure on the DOT. Now granted thats not where theyre supposed to run but its where the spray patten is best (I saw just this on a fuel test bench) and its common knowlede (supposedly) with the SRT guys.

Soooooo

If you can see that thats push lok line and not rubber hose your eyes are better than mine (and thats not suprising as Im blind as a bat) but what is obvious about the Mecum car is its a hack all the way around AT LEAST when those pics were taken.

Also fluid to fluid friction can cause cavitation and bubbles as well, BUT even knowing that I still ran my return line in the bottom , why ? Because it looks better and will cut down on aeration.....I can change it later....I also unlike many others opted for a check valve before the rail to hold line volume....didnt have to but I could and its right so I did....

(no making fun of my lines I hadnt finished moutning them

Originally Posted by magnumv8

Hey Chris....Mopar has been using a system similar for years,with the return inside the fuel tank with the pump, reason?....no engine warmed fuel being recycled back into the fuel tank,one less fuel line also.uh-oh,now everyone knows....Electromotive's Tec3r system in their instructions says that a properly set up system requires NO fuel pressure regulator...hmmmmm.......on a carb setup universally the regulator goes before the fuel mixer(carb) on a fuel injection system the regulator can go before OR after the mixer(injector),so you can either do a return from the injector rail system or dead head the fuel at the rails with the regulator at the tank....which is better? depends on the setup and the only way to find out is to try them all....

The main issue that is the hardest to deal with is the "airation" of your fuel(bubbles in the fuel)...since fuel pressure is higher with injection it can happen real easy and be really hard to diagnose

On a "push-lok" pressure hose you do not want clamps on it because the barbs are so sharp they will cut the hose from the inside with the force of the clamp on the outside of the hose, I don't remember the max pressure some of these are rated for but I do know that some will hold 200 psi with no problem....

D L Rambo....