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Post by podunkracings33 on Jan 9, 2013 8:58:44 GMT -5
Is it possible to 3 wire a newer fuel injected 350?
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Post by 3sasquach on Jan 9, 2013 10:52:45 GMT -5
You talking about start/ignition ?
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Post by podunkracings33 on Jan 9, 2013 10:59:14 GMT -5
Yes. Distributor starter and alternator
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Post by 3sasquach on Jan 9, 2013 11:05:43 GMT -5
define newer? what year, There are some sensors you need and some you dont, What those are I cant say for sure. As far as the start function you should be fine but what about the rest of the igniton side.
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Post by podunkracings33 on Jan 10, 2013 10:57:41 GMT -5
It's a 91 or newer the truck it's in is a 91. But the motor is not the original
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Post by oldtrx on Jan 10, 2013 13:55:44 GMT -5
For simplicity and reliability I would swap the intake and put in a mechanical pump. Then you can use an hei distributor too. Takes about half an hour to modify an old style intake to work with centerbolt heads. The center 4 intake bold holes are more vertical on center bolt heads. I used a drill bit and a cone grinder on mine. The fuel pump, just pull the plate, get the backing plate/push rod/bolts from a donar engine and install a new pump.
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ae01x
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Post by ae01x on Jan 10, 2013 19:00:19 GMT -5
Check your block it may not be drilled for a fuel pump. I am with oldtrx though install a modified intake a carb and a hei distributor. even if the block is not drilled for pump u can use an electric pump and save yourself alot of headaches
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Post by bluecrew72 on Jan 10, 2013 20:58:33 GMT -5
Or you can bolt on a vortec style I take to convert to carb I would say that old tbi injection would be pretty in reliable in our application
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Post by oldtrx on Jan 11, 2013 2:40:59 GMT -5
The only problem I see with retaining the throttle body set up us having that much pressure on a fuel line. I've seen a few fires in mini cars that planted my feet strictly in the mechanical fuel pump group. I currently have a 92 5.0 h.o. roller engine from a camaro retrofitted with a mechanical pump. I have also had a 93 tbi 350 truck engine that had the block drilled for the mechanical pump push rod. I will agree that it is mostly going to be by chance hit/miss but is worth looking into. Im not sure what you were meaning by switching to a vortec style intake bluecrew? Vortec FI intakes/heads are lacking bolts on the manifold. Edelbrock does make a performer retrofit intake for centerbolt heads to run a carb. And they also make one for vortec style heads. If you decide to order one you need to stick to the tbi style of centerbolt heads pattern.
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Post by podunkracings33 on Jan 11, 2013 6:52:42 GMT -5
I'm wanting to keep it throttle body just for this derby and see how it goes. I have the universal fuel cell for the fuel pump and all. If I have to run the ignition and everything that's fine but I don't want to have to worry about it failing
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ae01x
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Post by ae01x on Jan 11, 2013 11:02:31 GMT -5
With out runing an ecm or an after market ign box like they do with the ls1 engines i don't think you can do it. with the tbi set up, fuel calculation is based mostly off the map sensor, coolant temp sensor and throttle position sensor. With out a computer of some sort will it wont calculate the proper injector pulse rate. Ignition timing is also controlled by the ecm.
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Post by 3sasquach on Jan 11, 2013 11:41:14 GMT -5
^^^ Yup. Not saying you couldnt find out what you need to use but if you havent done it before it may be a little painful. Your best bet would be to still have it in the donor truck with all running electrics hooked up. Start it up and start trimming till it quits or starts running rough. Then I guess you could wad up all the excess like the mini cars and keep it out of the way? Intake would be easier or a head swap to old style and use a cheaper intake and better heads. JMO
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Post by bluecrew72 on Jan 11, 2013 14:48:58 GMT -5
The only problem I see with retaining the throttle body set up us having that much pressure on a fuel line. I've seen a few fires in mini cars that planted my feet strictly in the mechanical fuel pump group. I currently have a 92 5.0 h.o. roller engine from a camaro retrofitted with a mechanical pump. I have also had a 93 tbi 350 truck engine that had the block drilled for the mechanical pump push rod. I will agree that it is mostly going to be by chance hit/miss but is worth looking into. Im not sure what you were meaning by switching to a vortec style intake bluecrew? Vortec FI intakes/heads are lacking bolts on the manifold. Edelbrock does make a performer retrofit intake for centerbolt heads to run a carb. And they also make one for vortec style heads. If you decide to order one you need to stick to the tbi style of centerbolt heads pattern. www.summitracing.com/search/department/air-fuel-delivery/section/intake-manifolds/part-type/intake-manifolds-carbureted/make/chevrolet/engine-size/5-7l-350/cylinder-head-style-application/vortec
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Post by TommyGun on Jan 11, 2013 15:59:05 GMT -5
Those TBI gm's only use 9-13 psi of fuel pressure so I wouldn't worry about that. For your original question about 3 wire technically no you can't just wire up your distributor and starter. But to wire it up and keep the fuel injection is not that much different you just need to power the fuel pump and ecm instead of the distributor. Personally I think it would be very reliable and I'm planning my next engine to be fuel injected.
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Post by oldtrx on Jan 11, 2013 18:58:45 GMT -5
The electric fuel pump is my biggest worry with them. I like the idea that when an engine with a mechanical pump stalls, the fuel cuts with it.
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