Any one running this combo?

I've just started my install & no issues yet, just the typical no such thing as bolt-on. Just looking for someone with the same combo.

Not yet but I will be.
Keep us updated with your journey.

Please let us know how it goes, I have a dual quad hemi also. If you don't mind, how much does the dual T/B set up cost?

Did you get dyno numbers before starting this? I'm curious about loss or gain.

I have a customer who wants a 500 + C.I. gen 2 hemi motor for his high end street car, I'm planning on using all Stage V heads, rockers and intake so I'm wondering which brand throttle bodies and ECU you bought?
I'm thinking EFI is the way to go now instead of trying to make two Holley, Edelbrocks or AFB carbs. work on it so it will start well after sitting for more than two weeks in the winter

Think it was 1700+
Tanks inc tank, Aeromotive 340lph pump,bracket,sending unit ~ 540's

No I didn't, ran it in on a make shift engine stand.

FiTech 625hp 2x4.

I was running the 650 Thunders for the past yr & half. Torque was awesome from idle up. Started good cold if running the day before or as much as a wk, but 2 wks was harder to start and was always worried about fouling #7 plug with too much prime.

Didn't know much about FI when I bought this kit maybe 4 months ago. Started reading up here lately on the A Body's only threads, and am about half way through the Chevelles.com tuning thread as I began the install. The more I read the less I realize I know. But I'm learning.

Cab_Barge I have ported Stage V heads (375 cfm), rockers, & covers also.



Hot restarts, more mpg on a long trip, are a few of the things I'm looking for. Also have an Overdrive for it once I get the FI ironed out enough.

I would suggest you consider port injection with standard throttle bodies. I've done quite a few dual TB HEMIs and the port injected motors always ran better. Dual Accufabs with a holley HP and you're good to go.

I agree
I wasn't planning on using EFI throttle body injectors Dual dry throttle bodies with a TPS on one or as recommended by the EFI company and have the manifold plumbed for the direct port injectors

No argument here,...port is better.

Me, I'm just still try'n to keep with the "stock appearing" route.

Filter, module, & extra ballast wires are round-tuits.



I Plan on using the stock dual upper fuel feed lines, a dummy vapor separator, & a dummy mechanical fuel pump for the return fueling to finish off the stock look, depending on the hassle or restrictions. Unless they add to much heat to the returning fuel. We'll see. Would be nice to have a fuel temp gauge on the feed side.

PS: Ballast is already a dummy.

With dual throttle bodies you only use one IAC and one TPS so I block off the IAC ports on the rear throttle body. The second TPS becomes a backup.

If I make this a "FiTech installation thread" should I continue here with all its details of electrical, fuel lines & routing, Tank & all issues, ...or start a thread over in the "Member projects & survivor pics"?

I've noticed though, that most FiTech discussions doesn't last too long here on Moparts.

Any one ever put a temp probe here?

@the Hemi Kid. I love those beehive springs in that picture. Which ones are those, what cam are you using?

Don't think there are too many using it/interested in it. I got mine as an experiment and the Jury is still out. Not to hi-jack, but my FITech stopped providing spark last weekend after running fine for 4k miles all summer, still no response from customer service...

Good luck with it. If you stumble across anything one you get it running, give me a shout...

I had this wrote down.
Springs: 377lb/in 1.88/155lb @ seat
mine ended up 1.86/162lbs @ seat

Best I can remember.
Cam: Comp Hyd Roller don't remember it's ID number
.569 .548(i think) 242 236,...don't remember the lc at the moment.
Isky bronze bushed solid rollers...the Hyd were too tall and messed up the push rod angle.

475ci and a ton of torque. Have taken off in 3rd by mistake and the motor hardly even cared.

Edit: Was reading in the Big Block oiling thread, and when I read 451Mopar's post about his XR286HR-10 cam, it rang a bell. Looked that up found the 24-711-9 for the Hemi went to put that in my files so as to remember in the future and there it was already. lol

I can understand that after reading most of the Tuning thread. I see the odds are against me as far as having it run good right OTB, or shortly after. Definitely plan on leaving the timing out of the picture for a good while.

I figure I will have to rely on a local close friend for what I can't figure out, & yes I'll try'n remember to holler at ya.

When I get caught up on the Tuning thread I may post there.

Well I caught up on the last 20-30 pages on the Tuning thread, & I have more doubts than before that I will have good results after the install.

I think it was the last 2 pages, that wasn't there 2 months ago when I received mine, that spooked me the most.

May carry on, but rethinking FiTech at the moment.

I am sure that many of us want to follow your experience. As FI gets more affordable, more of us are looking at it as an option. It seems that the manufacturers might be fudgeing a bit about the bolt it on and it will tune itself hype! Please keep us in the loop as you get this worked out. Thanks!

Before my "rethinking" I had already hooked up the harness connectors, BUT, I haven't connected the single wires,...e.g. the blue tech, white key, red battery, orange pump, or black coil wires as of yet. Was figuring on doing those last when I "began" reading the different threads on the FiTech and the many nightmares. Of course there are those that didn't have much troubles, but there's others with big ones.

On my setting up of the long connector linkage I used on the Thunders onto the 2 T/B's I noticed the rear TB secondary linkage had a lot of slop. Even though having no experience with FI I figured if all the injectors are all firing at the same time the slop of the rear blades would cause an AFR issue. Then realized that would cause the IAC to have to add air to fix that which would give an IAC count hassle.

While "rethinking" I called Holley to see if they have a Daul Sniper available yet, cause I've seen it mentioned in text but no pics or P/N on there site. Service rep. said they're not available yet & don't know when.

So I have some fittings coming to try in some tight places like the Tank offset to the trunk floor & the FHO inner to stock outer skirt filter base I combined for a stock appearing look that I've already been running. Pix if needed.

Edit: I assume the "experience" your mainly referring to is the FiTech performance after install,...I'm just adding to the thread for the moment.

I'm interested. I'm looking to make ~900 hp from a normally aspirated Hemi. I'm a little concerned about the 4150 mounting flange as I already have a CNC ported 4500 flange intake and all of my N20 hardware is for a 4500.

I found this article today and their results are consistent with what I've seen on other forums and youtube:

http://www.hotrod.com/articles/1968-plym...er-and-cheaper/

Well, if I had waited another wk before starting that first post,... I wouldn't have,... or it'd be more along the lines of this one.

I've read more than 2600 post now, about the FiTech Tuning & issues, & I've lost all but a strand of hope on it working right, but leaving me stranded somewhere,...even worse say after dark, and it's winter.

Yes there are several that work well, but to me compared to what's been posted, the more I've read the worse the odds!

Called yesterday about dual Snipers, ...not available yet, and don't know when. Thought about buying those and selling these, but that expensive fix went down the drain too.

Still rethinking.

Why not go with port injection? It's what 90% have done in the past. Throttle bodies are lower so you gain hood clearance, manifold stays dry so cold start and warm up are like a new car, no distribution issues, and IMO they just run better. Match the throttle bodies with a Holley HP or a FAST XFI and there would be less stress. But I also heard that eating turkey lowers stress.

I had side stepped the port injection because of the looks of the fuel rains don't go to well with my stock appearing theme. But now on my rethinking of the FiTech install I've began to look at that option and how it would show from under the filter base.

Appears the #1 & #2 manifold areas would show for sure. The lower height of some of the aftermarket TB's might help hide the rest of the railing though, & maybe painted/anodized black to hide somewhat, or orange to blend.

If this car was for gear bang'n or pro touring the PI would be a no-brainer, & I have other cars for that. This one though, I've been try'n pretty hard to keep a stock look, and have varied from that in some areas where I felt the need.

The dry intake cold start and warm up, better distribution, run better,...believe me are not easily over looked even though I have a theme going on.

Looks like Stage V has put some extra material in for a low deck shave also on their PI manifold, making it a bit ugly in areas. Wish it had just boss's for the injectors, but not sure how you'd hold the rails down and look neat.

Rich got any pics of other Hemi port injections?

Are you using inline or tank pump? Return style? I'm using return style with in tank pump on a mild 454 chevelle. -6 feed and return. Still plumbing fuel. Got it all wired up tho. I'll keep watch here

Thanks for the pic Rich, been studying it for a little while. I see an issue & have some questions. Wish I had that setup in hands for test fit.

First hurdle is my air filter base appears to need the same space as the fuel rail ends at that elevation. So, are there shorter injectors?

Also that pic answered a question I figured could be done and that's rotating the injectors 180* so the elec harness could be on the TB side and be out of sight, depending on TB linkage.





Those tubings, are they for excess fuel like on a diesel? I take it, there's setups with out this?

In tank, Aeromotive 340lph. Originally planning on the return from the internal regulator of the FiTech, back through the stock fuel feed lines, gutted Vapor separator & mechanical fuel pump then through the stock 3/8" line to tank, for a stockish look,...depending.

Still waiting on some fittings to arrive to see how things will clear & route. Barb fittings are just to help figure hose ends & lengths




Was planning on PTFE liner hose for feed line but I would really like to have more than one arm & leg when this thing runs again!

I use only shorty injectors now. That pic was from 12 years ago. Also on my car I added short carb spacers under each TB. Had plenty of room because the TBs are much lower than a carb.

I put shear plates under my carbs on my stageV intake, hoping they help with better air distribution. Tim

would you possibly have a pic or two of these you could share ?

Thanks for the zoom. My bad for not noticing the details on the injectors. I had gotten a little side tracked on the Pro Touring look of coils, spacers, & linkage. Not saying there's anything wrong with those.

I poked around on the net for shorty injectors & found a 80# 48mm end to end, for an example, & don't know if that's the shortest. Manifold seat & rail seat, looks close to 28mm,...Well, I'm assuming that's 28mm.

What's the typical rail height? I guess I could poke around for that.

Stage V's phone is busy for their machined surface height, any one know that dimension?

I have all the injector sizes on my web site under Fast or Holley tech pages. Efiexpert.com

Ok Rich I'll look at those.

I swung by the shop a little while ago...long story short...it appears I may have as much as 4.5" from filter base to the intakes machined surface. That is if the Stage V's EFI intake's injector mating surface is the same height as my existing intake bolt surface. Don't know yet, Stage V didn't call back, probably closed for Thanksgiving.

The flat of the filter base transfers over to roughly the bottom of the vacuum housing. Looks pretty good even though I don't have a typical rail height dimension yet.

Here is a pic of the Magnafuel shear plates that I used. I spent about 2 hours hogging out the stageV manifold to fit the gasket like in the example below. Tim

thanks for the pic ! the plate gets installed as pictured, correct ?

I would say it's upside down.

i'll bet you are correct. i wasn't thinking straight. if it was installed as shown, it would raise the carb base for one, plus wouldnt allow the butterflies to operate at all even if you could get it bolted together. my mind is shot it seems.

I have always wondered why someone does not make a CNC base with the shear plate tubes already machined into the carb? Cost?