New guy here. I've had my '78 elko SS for ten years and 350 HO with about 2500 frustrating miles on it. It seems God just doesn't want me to get carbs right so, I'm tryin to go with something better that I'm already familiar with: TBI. I also have a '89 RS and '92 Cheyenne, both of which run beautifully. Now I'm not tryin' to do wheelies with my elko just get to work in style and still be able to pay rent and, maybe school some punk at a traffic light. I understand i'll need the throttle body, an ECM, TPS, MAP, O2, ECT, Knock and air temp sensors and 9-13 psi fuel press. I'm not sure if I should go with a factory ECM for say a truck with a 5.7 or aftermarket. And I'm a little puzzled about what to do with my old vac/mech adv. HEI. Any suggestions? I'll post a pic when I figure out how.
Fuel Inj. Converstion W/O going nuts
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Try to obtain a complete 305 tbi system from a donor vehicle.
I think in the earlier systems the ingnition system was entirely separate from the fuel system, I remember some Saab models with fuel injection AND points ignition.
Are you sure your carb issues were not related to other faults such as low compressions or manifold leaks?.
Throttle body systems won't compensate for such faults, later more sophisticated systems could to some extent.
Good luck.
Roger.
I think in the earlier systems the ingnition system was entirely separate from the fuel system, I remember some Saab models with fuel injection AND points ignition.
Are you sure your carb issues were not related to other faults such as low compressions or manifold leaks?.
Throttle body systems won't compensate for such faults, later more sophisticated systems could to some extent.
Good luck.
Roger.
Older cars did use MPFI and point distribution. I know - my 85 Cutlass Sierra with the grand daddy to the 3800 V6 was like that...lol That freaking car was... snappy.
Look into some aftermarket EFI systems. You can get them for SBC's easily and it's what I'm planning for my Grand Prix and a 305. Roger's right though, check for leaks, pressure, etc because those can cause issues regardless of what kind of fuel delivery you have.
They are costly but you could probably make up the difference in a few years with the way gas prices are. You will save some gas with these.
http://www.summitracing.com/search/Make ... Rank%7cAsc
Look into some aftermarket EFI systems. You can get them for SBC's easily and it's what I'm planning for my Grand Prix and a 305. Roger's right though, check for leaks, pressure, etc because those can cause issues regardless of what kind of fuel delivery you have.
They are costly but you could probably make up the difference in a few years with the way gas prices are. You will save some gas with these.
http://www.summitracing.com/search/Make ... Rank%7cAsc
It has a factory defective Holley(wrong gasket and yea, I asked for thier help) on it now and I have checked in everyway(including just reinstalling the manifold for giggles) no leaks. The only non ~800HP, Racing, warp drive setup I've found is a Holley Pro somethin or other for $1K but it claims to be rated for 670cfm and <275HP. The 350 HO is rated 330HP. Am I wrong thinking a 650ish cfm system should take care of that?
On the original track does the stock TBI ECM need vehicle speed? Or is that just for the speedo and maybe electronic trans?
So many questions, so little money/hope. I need a Jedi... And to stop drinking when I post.
On the original track does the stock TBI ECM need vehicle speed? Or is that just for the speedo and maybe electronic trans?
So many questions, so little money/hope. I need a Jedi... And to stop drinking when I post.
duster3t said:
i have a 91 silverado 350 in my 84 elko and it is a complete truck setup running the truck computer and it runs fine. you car should have a vehicle speed sensor behind the speedo. i had the harness grafted into the truck harness and the end result makes my car super reliable.... good luck
IMO, you should just get a Qjet built by someone like Dean Oliver. It would cost you about $350ish for a bolt on carb that would do everything you want it to do and it's a hell of a lot easier and cheaper that converting to FI. Is a carb better than FI for a street car? No, but it's way less hassle and expense to set up on a car that doesn't already have FI.
yea, I like the part where you said, "Is a carb better than FI for a street car? No,"
So I got my hands on a '95 GMC Sub 5.7 TBI but I need a schematic source to tell me specificly which wire is who coming out of the- ecm, pcm, whatever. A Hayne's manual tells me what color they are but, it turns out there are tree times as many wires as there are colors/combos. Does anyone know where I can find a resource for this?
So I got my hands on a '95 GMC Sub 5.7 TBI but I need a schematic source to tell me specificly which wire is who coming out of the- ecm, pcm, whatever. A Hayne's manual tells me what color they are but, it turns out there are tree times as many wires as there are colors/combos. Does anyone know where I can find a resource for this?
See if a local shop with Mitchell, ShopKey or Alldata will print you an engine wiring diagram. Mitchell prints in color and gives ECM pin numbers.
On the subject of the Holley Projection, it's basically a standalone GM TBI system with some adjustability. They work okay and they pop up for sale used for $200-$500 regularly. The 670cfm version is fine for your 350 unless you spend most of your time at the track. I'll just jump on the "put a Q-jet on it" bandwagon. A good Quadrajet that isn't worn out will return excellent reliability and fuel economy. ...And I don't even hate Holleys :lol: .
On the subject of the Holley Projection, it's basically a standalone GM TBI system with some adjustability. They work okay and they pop up for sale used for $200-$500 regularly. The 670cfm version is fine for your 350 unless you spend most of your time at the track. I'll just jump on the "put a Q-jet on it" bandwagon. A good Quadrajet that isn't worn out will return excellent reliability and fuel economy. ...And I don't even hate Holleys :lol: .
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