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Fuel Injection

chrisd

chrisd

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Ok, I've searched the forum and can't find what I'm looking for. So, hopefully some one will have some input. I just bought an '86 Fifth Avenue for the motor and trans, but I'd like to put fuel injection on it for reliability and mileage. It's just a 318. I don't want a monster, just a daily driver. The factory set up would probably be cheaper since I can get it from a junk yard, but what all would I need to get? Intake, harness, computer, what else? It's going into a '67 Charger is anyone aware of a company that makes harness's?
 
Do you want the earlier throttle body injection or the newer Magnum style port injection?
 
I'd rather have port injection.
 
Is it a Magnum or earlier 318? If you want to do port injection, it's gonna cost you a bit more than a budget build.
 
The engine came from an '86 Chrysler Fifth Avenue. Bought the whole car for $400. I'd like to go with a port system, but I don't know if the intakes will swap. (I know Chevies need adjustments.) I did get a response on the megamanual. They said they could help on the basic universal parts, but parts like fuel rails, etc that would be specific they couldn't help with. I know there's more to it, but it seems so basic to be able to pull the top end from a newer motor (computer, sensors, etc.) and put it in an older car. I've got to rewire everything as it is. Why couldn't I splice in where needed for fuel injection. What is the difference in a magnum motor that would pertain to what I'm trying to do?
 
on the back of the magnum blocks,is the provision for the crank sensor. the intake bolt arrangement is different,the magnum uses a DFI coil for the ignition,etc. it can be done and if you want to spend the money and time,by all means go for it.
but,if you are just going for mileage/reliability and not planning a big cam,or a bunch of upgrades,the 88-91 TBI set-up would be alot cheaper and easier. the computer in those trucks doesn't care what tranny is in it (doesn't care if it has overdrive,or if it is even engaged),and you can pull the entire harness out of a truck,and use it in your car with very little work. and the junkyards usually have a few of those trucks lying around. probably get everything from the donor truck for $100.00. set up an electric fuel pump,and your good. just a thought.
 
Ok, been searching while here at work(when I can). Looks like the heads are different. Does anyone know if they will interchange? From there up I should be able to put port injection on right?
 
superbyrd said:
on the back of the magnum blocks,is the provision for the crank sensor. the intake bolt arrangement is different,the magnum uses a DFI coil for the ignition,etc. it can be done and if you want to spend the money and time,by all means go for it.
but,if you are just going for mileage/reliability and not planning a big cam,or a bunch of upgrades,the 88-91 TBI set-up would be alot cheaper and easier. the computer in those trucks doesn't care what tranny is in it (doesn't care if it has overdrive,or if it is even engaged),and you can pull the entire harness out of a truck,and use it in your car with very little work. and the junkyards usually have a few of those trucks lying around. probably get everything from the donor truck for $100.00. set up an electric fuel pump,and your good. just a thought.
Click to expand...

Ok, just missed your post. If I found the right info, the blocks didn't change till '92. So if I go with a throttle body set up, then I don't have to change the heads to get the car going. Obviously for reliability and gas mileage, changing heads may be better in the future unless the '86 heads are good enough quality.
 
yes,you can keep your heads. the TBI intake will be needed,as the mounting flange for the throttle body is different from the carb. and,you will have to weld a bung in the driverside exhaust pipe,coming down from the DS manifold,for the single O2 sensor that the TBI's use. any 88-91 truck will have all the components needed for the swap.the computers in these trucks don't repond well to major modifications,aso plan on only exhaust,an open element K&N filter,and mild timing bump. a mild cam (like an edelbrock performer plus) is fine,but keep it close to stock,and that set-up will reward you with moderate performance and great fuel economy.
 
Won't there be a severe port mis-match from the FI intake to the non-magnum head?

Doesn't the magnum have a roller cam?

Wonder how that will affect the FI? I think 88 was the first year of roller cam in 318.

I also have a 2000 5.9 complete but with spun bearing, and an 87 5th Ave 318.

That scenario has played out several different ways in my mind over the past couple of years.
 
So I guess my best route would be to get a '91 or back tbi intake w/ the throttle body, computer,and harness. But, what about the distributor and how would it all wire up? I'm really looking for something to be able
to drive regularly and not afraid to because of gas mileage.
 
IMO, it's not worth doing all that work in the name of fuel mileage because I haven't seen much if any improvement. For example, had an 87 V6 Dakota (only year to have a carb on those) and it got 17 in town and saw low 20's on the highway without really trying but my 95 V6 magnum is doing good to get 16 in town and that POS has NEVER seen highway mileage above 20 on the highway. Funny thing is, the 87 did not have over drive and the 95 does. Same thing with our 2000 Durango...12-13 in town and 17-18 on the road if you are really nice to it. However, my 71 340 Cuda knocked down 17 in town and had a ton more power. I've had several cars with carbs that did well....
 
Well maybe I'm asking for too much. I drive round trip 100 miles a day to work. I'd like to drive the Charger as much as possible. My current driver gets 21-25mpg depending on how much my foots on he accelerator. I know I won't get that, but I'd like something decent. I wouldn't mind 17 if I get that.
 
chrisd said:
Well maybe I'm asking for too much. I drive round trip 100 miles a day to work. I'd like to drive the Charger as much as possible. My current driver gets 21-25mpg depending on how much my foots on he accelerator. I know I won't get that, but I'd like something decent. I wouldn't mind 17 if I get that.
Click to expand...
What's your current driver? The late model stuff....the stuff in the last few years, has much better technology in them to make them get better mileage than the first and second gen fuel injection systems did.
 
My mom has a 3.9 2003 Quad Dak. I am shocked that it only averages 16.2 in mixed driving. By contrast my 2000 club R/T Dak gets 13.5-14 in mixed driving.

I know the quad is a little heavier, and the six has to work harder, but mine has 3.91 gears vs the 3.55's in mom's, and only gets 2-3 MPG worse??!?

My older 318's typically got about 20. You would think a high efficeincy roller cam FI swirl head with o/d and lock up trans 5.2 would at least get that and should be much better.
 
Had a 92 5.2 Dakota regular cab swb with 3.9 gears. It ran a 15.30 at the track with just 200 miles on the clock and it got 15 with ease in town. Never ran it on the highway trying to get mileage but it got 15 going from Houston to Dallas pulling a jet boat on a tandem axle trailer running 70 all the way.....and it got 15 on the way back running without the boat and trailer doing 80! I couldn't believe it! A buddy of mine had a Club Cab 92 5.2 with 3.55's and he said he got 20-22 on the road all the time. The newer gen Dakotas are a lot heavier than the 96 and older trucks but several hundred pounds. A regular cab RT with few options kicked the scales at the track at 3900!
 
Geting farter off topic.....my company truck at work is an 05 (newest body) Dak club with the 3.7. I drove to Orlando, once for a class and it got right at 19.

I don't think the 3.7 lived up to Chrysler's hopes.

I do think the 4.7 was efficient, but word on the street says PITA to work on and maybe not so reliable.

The 97-04 is really not too much different from the 91-06 from the seat all the way to the back bumper, at least under the skin.
 
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