Magnum EFi idea? Suggestions please

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Mopar92

Mopar92

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I'm doing a 360 Magnum swap and 4 speed into the Duster as we speak. After seeing the difficulty and expense to make the tone ring work... I questioned my avenue for the build. I'd need to buy and modify the flywheel setup for the OEM efi. Then I'd need the wiring harness. I know some may scream that Throttle Body efi sucks and all of that... but I've been looking at a my expense and purpose. My purpose is a 300hp-325hp Magnum to drive a good bit.
Here is what I'm thinking and tell
me if I'm wrong.
FITech street version
4 barrel Magnum intake
Rebalance a 130 tooth Flywheel to the Magnum.
Looking at the Beer Keg intake and it's limitations, custom harness,and that... I could just EFI tech it and be done with it for less money. Thoughts ?
 
My thought is to slap an rpm air gap on, a demon 750, and a pair of headers and enjoy your 300-325hp:) Any reason in particular you're set on injection?
 
Yes. Because I want to do something different. Be more reliable, fuel economy... etc. that Demon start and idle good in hot and cold weather? Efi is clearly the future and this might educate me more in the efi world.
 
Flywheel and harness are the same price as FITech, but MPFI is vastly superior to throttle body, plus the factory injection has a proven track record of super reliability and replacement parts. Its an easy choice....just my $.02
 
Mopar92 said:
Yes. Because I want to do something different. Be more reliable, fuel economy... etc. that Demon start and idle good in hot and cold weather? Efi is clearly the future and this might educate me more in the efi world.
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Sounds like a plan, either the FI Tech or the Holley Sniper will do the job. Crosswind or Eddy intake regrind camshaft and a Tanks Inc setup your good to go. Buy the time you buy a good (adjustable carb) if your fuel system needs any work (tank ,sending unit) your not that far off price wise. Check out Evans prices on regrinds and fuel system parts.
 
I hate to give up the MPFI but with expensive and limited intakes... and the beer keg not really designed for big HP... this is a crossroads for sure.
 
Mopar92 said:
I'd need to buy and modify the flywheel setup for the OEM efi.
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No modifications needed for the two off the shelf flywheels available, other than cutting a notch in the bellhousing for the sensor. Both are ready for the OEM EFI off the shelf.

Mopar92 said:
Rebalance a 130 tooth Flywheel to the Magnum.
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So you have to buy a flywheel anyway? And balance it for a Magnum? Why not just buy one from MagnumMopar? You could even get it with the notches cut in it.

Don't see how your plan is any better by going to a TBI setup.

Mopar92 said:
I hate to give up the MPFI but with expensive and limited intakes... and the beer keg not really designed for big HP... this is a crossroads for sure.
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I agree that the beer barrel intake is a limitation, but I suspect it isn't that far off the mark for what you are talking about (300-325 hp). I'd bolt it on and go with it for now.

Later on if you wanted more, then buy the Hughes one to replace it.

Pretty sure Hughes and Indy are the only places selling an EFI Magnum intake anymore. Mopar Performance discontinued the two they sold and I don't believe Edelbrock sells an intake with injector ports cast in. Not a fan of the Indy intake, unless I was going to supercharge the motor. Not an ideal intake out there, but at least there is still a source for one (for now).
 
I guess I'm at the price vs performance crossroad. I'd really like to just call them up and buy the whole kit for the MPFI but $600 for a harness is 2/3 the way there on a setup I could run. Ultimately I'd love to just stick with the Mopar stuff. Lot of thinking to do before I order something this month. Thanks!
 
Don't buy that harness. Modify the stocker. Dirt cheap at your local pick n pull and common as can be.
 
I'm a HUGE efi fan, and I'd still run a carburetor before I ran that fitech stuff.

Tbi gains very little over a carb on what's important to me, and I want parts available ANYWHERE, diagnostics available ANYWHERE.

That's just me though.
 
I just picked up magnum 360 on the weekend and want to put it in a car with a 4 speed. I'm in the same boat as you on what to do with the the fuel injection, l did not get the ECU with the engine so I would have to buy one and get it reflashed which would cost I assume about $600-700. Add that to the $600 wiring harness and I could do a Holley sniper system on a aluminum intake.....

IMG_0665.JPG
 
Man I'm jealous. I make my biweekly rounds at the large yards and can't seem to score a 5.9. Good work. Sadly I have a solid little mild LA360 pan to I take. I could put an FI Tech Throttle body on it and be on down the road.
 
Mopar92 said:
Man I'm jealous. I make my biweekly rounds at the large yards and can't seem to score a 5.9. Good work. Sadly I have a solid little mild LA360 pan to I take. I could put an FI Tech Throttle body on it and be on down the road.
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I bought the 360 off a guy who works at a scrap yard, he claimed to have brought it home to use in a hot rod he was building but changed directions.....I think he really brought it home so he could get some cash for Christmas gifts for his kids.
 
why not run megasquirt? run an ati balancer with a crank trigger or a 24 tooth shell.
 
I don't have a degree in EFI. No megasquirt for me. I don't want a 4H project like that.
 
What intake would you guys think would be best on a magnum with a Holley Sniper EFI? I will be buying those EQ heads from Magnum Mopar so I can order LA or Magnum bolt pattern, thanks.
 
If you start getting stuff like crank triggers etc then its no longer inexpensive or easy to get parts. If you use a 96-97 Ram pcm you dont need a flash and you can get them at U pull it yards for well under $100. The 5.9 will make plenty of power with factory kegger intake, it just wont make power above 5000 RPM....how often do you take a V8 past 5K on the street? Choosing to use an 833 does make it a bit more expensive but only $300, you still need to recondition an old one with carb which is probably $70 if you have a good one. I have almost always chosen a lighter weight aftermarket flywhel no matter what I was driving but thats me.
 
I have megasquirt on my 340, and I run a stock magnum distributor for a cam sensor (I use coil near plug so its not really a distributor anymore)...and my crank sensor is a $9 piece for a 3.0L ranger. The target attached to my crank pulley. Do something like this and you'll have it running in no time flat. The thing is tuneable to no end and runs extremely well. With a wideband it will get close on its own. I'm sure if you started with the stock magnum EFI parts, it would be a lot easier than what I did - just change to either a basic distributor or a crank trigger like I did and you're golden.

My car started the first time I tried it. Could drive it after one warm up cycle.

MS3 Pro Sequential Injection + Coil near plug conversion thread
 
I would agree mpfi in factory form is superior to a tbi setup, but I think that the fitech and sniper have an advantage in their simplicity when it comes to after market. I get all my stuff from pace performance as Johnny gives us 5-10 percent off on everything, including the sniper or fitech. something about new stuff in a box beats skinned knuckles on a 15 degree day at a pull a part, while not knowing if the parts you are pulling are even good...

They also sell the pump kits, and drop in tank kits. I personally prefer anodized aluminum fuel components to brass and zinc barbed fittings. Few summers of "walmart" gas and I cant see that stuff faring too well. It turns carbs to sludge....I know that for sure
 
....how often do you take a V8 past 5K on the street?....
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Several times a week! :) MPFI rocks! It's a night and day difference over a carb'd vehicle.
 
Anyone try the FI intake that Hughes sells? It looks like you can use the factory MPFI with it, I would guess that it would make power past the rpm that the factory beer barrel would.
 
67autocross said:
Anyone try the FI intake that Hughes sells? It looks like you can use the factory MPFI with it, I would guess that it would make power past the rpm that the factory beer barrel would.
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99% certain jbc426 is using one, and making over 500hp IIRC.
 
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