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08:51:02 - 04/19/2024
Dakota Performance
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capone
Dodge Dakota
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10/03/2007
13:06:14
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 Subject: Fuel Injection
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Message:
I have a 360 that has been built and I'm looking at options for
fuel injection. It is an LA block with forged crank and rods and a
cast crankshaft. The heads are Hughes' Iron Ram heads with
oversize valves. The combustion chamber is stock size, but
between the pistons and the bock being decked compression is
about 10.25:1. I chose a hydraulic flat tappet cam 219/228
duration. The intake is an M1 setup for fuel injection. It has
custom long tube headers. I'll choose the throttle body when I
decide on which setup to go with.
This motor is going into a '97 2wd 5spd that originally had a
318.
Ok, here are my options:
1. Have the stock computer flashed (not as precise of a tune)
2. Buy a mopar performance pcm (I'm not sure how much it can
adjust, or if my setup is to radical for it)
3. Megasquirt (cheap and it works, but you have to tune it
yourself with a computer)
4. F.A.S.T. EFI (basically like megasquirt, but really expensive.
It has its own throttle body in the kit and its easier to tune)
5. Mass-Flo EFI (a nice kit that comes with a throttle body and a
sensor that allows it to tune itself. It usually comes with an
intake manifold, but idk if it works with the M1)
So those are my options. Megasquirt, FAST, and Mass-Flo are
standalone systems and I'm not sure how to integrate it with my
main computer or if they replace it or what. If anyone has any
experience with fuel injection, I'd really appreciate your advice.
Thanks for your help everybody.
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.boB
Dodge Dakota
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10/03/2007
21:41:34
|  RE: Fuel Injection
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Message:
None of the aftermarket stand alone systems will integrate with your stock computer. If you need that for emissions or whatever, forget them. They won't work for you.
The mopar performance PCM won't work for you. That set of operating parameters is designed for an essentially stock engine.
Having the stock computer flashed with a custom dyno tune will give you the best results. Everything else on the truck will still work as designed. The stock wiring harness, sensors, etc, will be retained. And the tune will be perfect for your vehicle and no other.
The trick here is finding someone who can do it. First, they need to have a dyno and know how to use it. Second, they need to know how to reprogram your stock computer. It's going to cost some bux. But to get good performance out of this new engine, that's what you need to do. Don't try and cheap out with some out of the box solution. You know it's not going to work for you, and you'll end up with a dyno tune anyway.
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capone
Dodge Dakota
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10/08/2007
17:41:21
| RE: Fuel Injection
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Message:
Thanks Bob. Thats actually the direction I've been leaning lately
too. I've got another question for you though. How much does
a reflashed PCM adjust to environmental conditions and minor
changes to the vehicle (like changing tire size or putting on a
new exhaust)? Once the motor is in the truck it'll be essentially
done for a while, so if the flashed PCM can handle it then thats
great.
The only other thing is that somewhere down the line I'm
looking to stroke the motor and do some more porting to the
heads. I'm assuming that if I did that I'd need to flash the
computer again. This is the main reason I'm thinking about
something like megasquirt. I'd only have to buy it once and then
just retune it rather than having to flash the computer again for
$500. Does anyone know how megasquirt works? If it replaces
my computer and will run the guages and everything and all I
have to do is tune it, then this is a tough decision. Any input
would be appreciated. Thanks again everyone.
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N56629
Dodge Dakota
JOIN HERE
10/08/2007
18:29:34
| RE: Fuel Injection
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There's a good megasquirt thread on dakota-durango.com
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.boB
Dodge Dakota
JOIN HERE
10/08/2007
23:08:27
| RE: Fuel Injection
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Message:
Once the new program is written, it's in there. You won't be able to go back and make changes like tire size and such without reflashing.
If you make significant changes to the air flow (exhaust, intake, stroke, bore, etc), you'll also need to make significant changes to the fuel flow to maintain proper AFR. You'll need a new program.
Aftermarket computers operate in the same manner. Significant changes in the engine require changes to the program. The advantage is that you can go in and change one simple thing, and leave the rest alone.
The disadvantage is that the aftermarket ECM won't be controlling the trans or gauges, or anything else. Trying to integrate the factory VCM with an aftermarket EFI only ECM could be tricky.
I would think if you put dual sensors in place for both the ECM and VCM, place dummy loads on the VCM harness, and connect the ECM to the fuel injectors, you could probably make it work. Use an EFI only system like Haltech. Let the VCM control the spark. Beyond my pay grade, though.
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