I saw the latest FiTech 2x4 Dual Quad Go EFI in the latest Mopar Muscle magazine, and it stated that it supports 1200 HP.

I am building a 605 Hemi with the Stage V dual quad intake, and was planning to use dual Edelbrock 800 cfm AVS carbs or custom Holley 770 CFM 4160 in an inline configuration...

So now I see the new FiTech dual quad 2x4 Go EFI, and I am wondering if that would be the best of all worlds???

Any opinions on my above choices, or is there something better for my 605...as it should be able to provide 800-900HP, Solid Lifter Roller Cam, 290/298 @ .050 and .700" lift. 12.5:1 CR.

Thanks for your advice, Mark

You are not going to get 900hp out of a small runner intake, that is for sure. Just not enough volume to support that kind of hp on one of those. At the very least, get the open plenum dual quad...I believe the Stage V is the open one, but there are dual planes out there, stay away from those.

I have not looked at the Fitech stuff, but efi that self learns and can keep you in your target afr will be best. I have run FAST efi in the past and like it a lot, and the Holley efi seems to be even better based on people with experience with both. The big hemi will like fuel....a lot of fuel!

Interesting little article on the Fitech....I would also recomend the Modman intake for your big Hemi, we dyno'd one on a 572 Hemi and it works well.

http://www.hotrod.com/how-to/engine/1603...er-and-cheaper/

Here is the thread on my buddies 572 Hemi

https://board.moparts.org/ubbthreads/ubbt...tml#Post2042917

Here is the thread on my 605 Hemi build

https://board.moparts.org/ubbthreads/ubbt...ld-updated.html

Why not weld bosses on each runner with injectors instead
of throttle bodies.. just run one throttle body with the
electronics and the second one just for air

Hi Dragula & Mike,

I bought the open plenum stage v dual quad, and that is what Barton told me to buy. He told me ho have it ported and it will make gobs of HP. He told me to stay away from the Indy open madman..,

Barton also told me to go with the Holley FI runners with the dual throttle bodies, but that was before the Fitech 2x4 1200 hp version was out.

I still have time, but would like to know what wold be best for street/strip.

Thanks!

Modman has the bosses already.....Ezeepeezee

Most efi "experts" lean towards port injection and dry intakes. A 605 hemi isn't a "budget build" so that's the route I'd go. I'd probably go coil-on-plug too, what the hell !!!

Well, you can have more than needed and it won't hurt engine performance, but in a wet flow environment, it can...So that is the advantage of port injection. I have ran both, and like both.

In his case he is already runner limited, so maximizing port size will do nothing but help make more Hp...

For the Modman, or madman, I did not get a look at the plugs after a pull on the dyno, but if there is any tougher combo to make over 740hp on a 572 Hemi with a 6-pak & a Modman, I don't know what it is. It actually worked pretty well considering.

So back to your build. I ran a FAST EZ-efi on a warmed over 360 in a prostreet application and almost no vacuum, and I loved it over a carb every day...I had an air-gap intake on it, and milled the whole center divider out, and then put a 1" open spacer on underneth, and it really woke it up....I would feel pretty confident with the Fitech if its anything like the FAST systems. Let it learn and wire it exactly the way they tell you, no short cuts!

For fuel supply, there is one shortcut you can take, and you may or may not want to. I ran and do run a hybrid style return/dead head system. I run all the fuel up to the regulator, usually on the lower passenger frame rail, and then return it from there, but I supply the TB or carb with a dead headed fuel supply from the regulator....So up to the regulator it returns everything, but up to the TB, its dead headed....You might want to do this to keep it simple, but then again, it is a 605 and AN8 is probably the smallest I would consider using. Not sure what AN6 will top out at so I would stay bigger.

I use that now on my 605, but with a carb...Only drawback is, the A1000 pump can put out a lot of pressure, any hickup in the fuel system and the carb gets a big hit....But, I can switch back to efi with a simple change of a spring in the regulator.

Hi Dragula,

Thank you for the pointers...

I have the A3000 pump kit mounted in the trunk, fed with 2 an10 lines from the sump, then the return from the pump to the tank return, then an10 up to the aeromotive pro stock regulator that is deadheaded. Then I will run an an 10 to the Fitech fuel station, from there an an10 to both throttle bodies.

The fuel station has the high pressure pump, and receives the high volume low pressure from my existing fuel system.

The other alternative is direct port injection, with a Holley efi unit and all the wiring...the idle vacuum at idle will be around 7-10 inches would be my guess.

In the interim, I could install it on my RB 440 that also has 7" at idle.

What do you think?

Thank you, Mark

I run the Holley Dominator...an8 supply and return..
with the injectors in the lower part of the runners
you can move more air for more power... if your injectors
are large enough you wont have an issue... I do prefer a
return system.. ALL THE TIME...keeps cooler fuel up front
EDIT
Mine is on a 416ci.. just had it out today and it ran
STRONG.. and I didnt even open the elec dumps

Well, I went and got myself in over my head, but I ordered the Fitech 2x4 power adder system from Jegs, and the Power center HP fuel pump system on ebay. the Power center is on back order for 6-8 weeks, so I paid the shipping hostage on ebay to get it right away.

I talked to the Fitech people, and they told me the Power Center pump system would support the direct port rail system at a later date, should I want to use theirs or Holley system. They told me I would be very happy with their throttle body system.

I really like the dual quad look...maybe I am just stuck in the past ;-))

br, Mark

sweet

You could always buy my system I have for sale...Fits a Hemi with 16 bolt intake!

Hey Dragula,

Beautiful! won't fit under the hood ;-))

BR, Mark

Thats why you put the hole in the hood... to get the
air in that big thing on top... LOL

Hey Mike,

I don't think Randy would like me cutting a big hole in his beautiful hood...well maybe he would?

BR, Mark

If he seen that he wouldnt have batted a eye ball...
we would have said.. hell yeah lets do it

I'm surprised the Mod Man works, it's a shoebox with stubs attached, like a 1950s Crower U-Fab.
Must be some voo-doo inside to justify the price...

Advantages to individual port injectors (vs. wet manifold):
1. you can adjust each cylinder mixture separately for both distribution and temperature - with a wet manifold you're back to ditches & popsicle sticks
2. clean air will follow the vacuum pulses, where suspended fuel droplets will fall out, then re-attach and go somewhere you don't want

Just curious: no V8 engine has its intake ports directly opposite each other (#1 and 2, etc.), so why is the manifold plenum a rectangle? Shouldn't it be a trapezoid, with the short sides (front & rear) and port runners directly aligned with the ports, and the carburetors likewise (angled)? Same length from venturi to valve left vs. right?

Polyspheric,

Do you know what parts cables that I would need to buy if going the Holley efi port injector system that would also be self learning for both street/strip?

I am open to all suggestions!

Thank you, Mark