Re: Fuel Injection for my 454
 

Change your ICM, they go flakey with heat when bad.

Re: Fuel Injection for my 454
 

My motor runs at 195-210. Never have issues. My old 350 did that in denver colorado. It almost crapped out in the middle of a very busy intersection on my way to a consert. Just bearly made it acrost. Never with new motor even with the carb.

I do wish fast could control the spark. They make a ignition to run my ls motor and there is no way for the ez efi to control it. That is the only reason i like the msd set up.

Re: Fuel Injection for my 454
 

icm?

Re: Fuel Injection for my 454
 

Ignition Control Module

Re: Fuel Injection for my 454
 

Good thread. I'm stuck between adding fuel injection to my 454 or wanting to go the LS motor route. Maybe this make my mind up.

Re: Fuel Injection for my 454
 

Not if you look at the pic i posted. Aftermarket efi on ls motor..... I was really confused.

Re: Fuel Injection for my 454
 

Well my thing is the 454 is perfectly fine so I don't want to pull it out. And I'm planning on replacing the 350/NP 203 combo that came in the truck with a 700R4/NP 205 combo first. But that FAST EZ EFI does look like a good choice.

Re: Fuel Injection for my 454
 

I'm using a MSD Digital 6 with an HVC Regulator and Pro billet dizzy. Doesn't that digital 6 control ignition?

Re: Fuel Injection for my 454
 

does the MSD get some air? even they can go funky, why they run two boxes on a NASCAR to switch over.

vapor lock happened to the big GM cars with AC in hot climates where underhood temps could melt lead, and they fixed it by using a block pump with a return line.

Re: Fuel Injection for my 454
 

Anything can fail. When there's that much $$ riding on it, it pays to have a duplicate back-up. DUPLICATE, not alternative..... That should indicate something.

Re: Fuel Injection for my 454
 

i've been doing some researching on my own over the last few months on adding fuel injection to my suburban and i've narrowed it down to FAST ez efi and MSD atomic efi. I am not close to pulling the trigger on anything yet so I am still looking to see what people have to say about each system. I've heard great things about FAST's products and I know MSD has some quality stuff too. I want to hear more about real world usage of MSD's system just because it's so new, but early indicators show nothing but positives from it. I think MSD's system is easier to install but I really don't think a guy could go wrong either way.

Re: Fuel Injection for my 454
 

Great info.. I'm going to do an EFI system on the '87 sometime this year. I hate not being able to take it out for a lengthy cruise without wondering when it's going to get over 200 degrees and die until it cools down. As long as I'm above 40mph, I'm good. It's when I drive in town, light to light where I have the problem. I have a BeCool radiator and Flex-a-lite electric fan setup that works great at highway speeds.

I'm also in the middle of a rebuild on my '57 stepper too so time is challenge.


Ken

Re: Fuel Injection for my 454
 

I have somewhat changed my direction from my previous post. I found a good deal on a lightly used FAST throttle body complete with injectors and sensors (the one from the EZ-EFI kit) from the FAST test dyno on ebay. So now I'm going to build a MegaSquirt-II v3.0 ecu and a wiring harness to control the throttle body.

Definitely labor intensive, and still not cheap, but I hope to have ~$1,100.00 in my system, and the ecu will be fully programmable, easily modified in the future for whatever I want, it will control the ignition timing, and includes a real time barometric pressure correction. Plus I hope to learn a TON about fuel injection by building my own system.

Using a megasquirt type system and junkyard TBI parts, you could probably inject a motor for $500 or so.

Re: Fuel Injection for my 454
 

Good Luck... I'm going to investigate MSD a little bit more, primarily to see if any of my existing MSD ignition system will work with their EFI setup. I've got a bunch of bucks tied up in a dizzy, regulator and ignition box that I'd rather not have to scrap if not absolutely necessary.


Kenny

Re: Fuel Injection for my 454
 

If your EFI system is a full management system utilizing an ignition amplifier you will be able splice in, bypass the amplifier, and use your MSD ignition box and CDI system.

Re: Fuel Injection for my 454
 

You can always run the ignition system separate from any EFI system. The main issue is usually on a aftermarket system, it needs a sensor to tell the crank rotation (for sequential fuel injection) or as basic as an rpm sensor. Mass air flow systems are usually better than a speed density unit, but there are rarely aftermarket kits for this. A basic speed-density unit is typically what you get with most aftermarket kits (Holley, FAST, Eldebrock, etc.) which only require a pressure sensor and temp. A really primitive system is an alpha-n system which is just creating a map from throttle position and rpm. A nice thing about the newer aftermarket systems is they come with a wideband O2 sensor and can self adjust themselves (closed loop system) without having to run to the dyno and create fuel maps on your own (I believe the FAST and the Holley Dominator kits do this).

Back to the ignition system, you can probably run your MSD dizzy as is with whatever fuel injection system you use. Now if you want to be able to still make an ignition curve electronically while using your same distributor, you can hook it up to a 6AL2-Programmable Box and you'll be able to tune it with your laptop. Also you can buy the MAP sensor and even make your own vacuum advance curve as well since the manifold pressure is on an absolute scale. Either way you can still run your existing ignition setup with just about any EFI kit.