Chevy TBI on a AMC 360. Can it be done? - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 03-09-2008, 06:41 PM Thread Starter
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Chevy TBI on a AMC 360. Can it be done?

I have a friend that wants EFI on his 360 but the kits are not cheap at all $1000+
Can you get a Chevy TBI to work on a 360?

88 YJ SOA2.5" 2"BDY Locked F/R Chevy 4.3 NVG241OR 4.56's 36x12.50
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post #2 of (permalink) Old 03-09-2008, 07:03 PM
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Yes... use a TBI sytem off a GM 350. The worst that can happen is that you'll have to bun a new Eprom.
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post #3 of (permalink) Old 03-09-2008, 10:05 PM
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In reality, the Howell FI system is actually a GM setup with some modes.

Check out DIY FI It has a lot of info on doing your own FI system.

I presonally will never have another veh with a carb (unless it's a classic...like the 67 MGB I have in storage). Once you understand the system...it's the only way to go.

I would speculate that your biggest problem will be adapting the TBI plate to your existing intake manifold and the dist. The nice thing about the GM TBI is that there is no crankshaft position sensor....the timing is physically set at the dist and the computer uses the pulses from the dist to determine when to fire the plugs.

Basically, you have the following major sensors that should mount to the engine with little or no trouble.

MAP - Manifold Air Pressure
Temp - Temp sending unit on the t-stat housing...or near it.
Dist - Connections to the dist (see manual).

There is some other stuff...mostly related to emisssions...like the charcoal canister...etc.

You also need to check your state laws regarding emissions. You might be better off getting a chevy SBC TBI motor and putting the whole thing in...

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post #4 of (permalink) Old 03-09-2008, 11:04 PM Thread Starter
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ya i know most of the kit looks like some form of GM TBI its all easy to swap over i think sep for one thing the distributor. I would bet a GM distributor is not going to fit in a AMC. so what would one do about that?

88 YJ SOA2.5" 2"BDY Locked F/R Chevy 4.3 NVG241OR 4.56's 36x12.50
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post #5 of (permalink) Old 03-10-2008, 12:01 AM
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I am guessing here, but would be willing to bet that the "trigger" for the injectors to fire, is likely a negative or grounding operation into the ECU. I have the diagrams and would have to verify this, but I would think that the tac lead off an HEI style dist (that has been fitted to the 360) would likely work well for this signal.

Is this the only hammer you've got?
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post #6 of (permalink) Old 03-10-2008, 12:10 AM Thread Starter
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The computer controls the advance to so its not that easy..

88 YJ SOA2.5" 2"BDY Locked F/R Chevy 4.3 NVG241OR 4.56's 36x12.50
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post #7 of (permalink) Old 03-10-2008, 08:09 AM
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The easist way to have the computer pulse the inectors is to use the tach signal off the HEI (And yes, you can get a HEI to fit a 360... it takes either lots of bucks to buy one, or have the base machined). The HEI Tac signal pulses the computer, which in turn pulses the injectors. At least on my 258 that's how I do it...
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post #8 of (permalink) Old 03-10-2008, 02:27 PM
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Call Affordable FI and get one of their "tach filters" that triggers the ECM/fires the injectors using the coil... should save you a $Franklin$ having to swap in HEI over the DuraSpark you (should?) already have!

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post #9 of (permalink) Old 03-10-2008, 03:02 PM
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You don't need the tach filter unless you're running a multiple spark device. I was able to pulse the computer using the OEM FOMOCO/Jeep distributor on the 258.

Last edited by LEVE; 03-10-2008 at 10:54 PM.
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post #10 of (permalink) Old 03-10-2008, 04:53 PM
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The Howell kit has a small circuit board buried in the wire bundle that I assume is some type of filter. Also There is supposed to be a way to use the ignition module from the tbi distributor to provide the signal to the ecm. I think this has been posted here before. Custom EFI's is your friend in this.

edit: Here is the link to the post. https://forums.off-road.com/jeep-short-wheelbase/185070-how-gm-duraspark-ignitions-parallel-tbi.html

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Last edited by jeeperjohn; 03-10-2008 at 08:21 PM.
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