Challenger Drag Pak Owners

[denbreeden]

Hi all, I just picked up my 2010 Drag Pak # 18 from Livonia Friday. Looking forward to racing A/SA next year with everyone. Anyone have any info on which headers are the best for these cars? Thanks!

[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...line sizes are another area where you need to optimize the flow....a line larger than what you need can hurt you as much as one too small...as long as you can cover the required gpm with the optimum fps(feet per second) that you need with a certain size there is no need to go bigger...in fact fluid dynamics will actually HURT your flow if the lines get too big( too large of a subject for here)

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....

[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....

[Irv Johns]

"Obviously you can run a closed circuit, we did in testing for the FI system, but there are obvious benefits in an open circut system." by Drooze


wow! do you think I can pick up by changing my fuel plumbing>>>> I hope so...Ive got -4 going to my fuel rails

[Chris "drooze" Wertman]

Yer funny....-4, I pee a bigger stream than that.....The benefits arent in speed Irv , obviously....and No I dont think you can pick up......well see at Pomona.....the question isnt right now HOW were going to run its IF were going to run....Damm forecast dosent look good for this week.

Ill be happy to send you a vid of the atomization tests on the fuel test bench, if youre telling me that with your system you can hold a steady 72 psi +/- .25 psi, cool, it can be done with a closed system, but for the 3 rd time, thats why I was wondering HOW , if you even know, HOW are you modulating your pump and line pressure. When running from idle to WOT , I wasnt aware the FAST or AEM was that accurate in pump handling and it was a curiousity question , NOT a cant be done, the BENEFITS of an open system is I can hold that pressure and not depend on electronics to handle it, then again maybe your running yours stuffed and dont know it ? There are benefits to a closed system too.......

I cant remeber if youre running the AEM or FAST, I know they have provisions for it, so Im not suprised if thats how its being done. But I am actually suprised at with all the guys you have help , experienced people who know their stuff, that that was the system you ended up with.

Pomona is gonna be FUN ! Cant wait to meet you......

Read my blog tongiht if you want a real suprise of something you said either couldnt be done, or noone had yet I cant remeber

Originally Posted by Irv Johns

"Obviously you can run a closed circuit, we did in testing for the FI system, but there are obvious benefits in an open circut system." by Drooze


wow! do you think I can pick up by changing my fuel plumbing>>>> I hope so...Ive got -4 going to my fuel rails

[Irv Johns]

OK I give what blog???

[Larry Curtis]

Car #'s 11, 22, 26 are all in MN. 22 & 26 will be A/SA and 11 will be A/S. #25 belongs to Tom Lee in NY it is a 6.1. I will have 2 or 3 more car numbers for the list later this week.
Larry Curtis

[Ed Wright]

Should be some of those turned into SS cars, I would expect. After hearing some of the engine specs, they should make some killer SS cars.

[davidhuff]

Would love to see more pictures.

[Larry Curtis]

You can also add
Denny Bairel car #40 5.7 6-speed
John Overby car #48 6.1 Auto
Troy Martenson car #52 6.1 6-speed
all three are from MN
Larry Curtis