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| | | | Joined: Nov 2006 Posts: 324 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 324 | At present I have a Donor 1991 4.3 v6 Astro , TBI system. The v6 engine is now in my 51 pickup.The rest will be installed as I go along. Listed here are the parts from the Donor Astro.
1. Computer
2. TBI body assembly,sensors & controls,gas pedal etc.
3. Ignition & steering column.
4. New wiring harness from Painless Wiring for the above computer & engine.
Everything will be original exept the "Tanks Inc" fuel pump & tank. The rest will stay exactly as it was in the Donor Astro.
From what I have read if the pump pressure is properly set, the pressure regulator and sensors at the trottle body assembly via the computer analyses should deliver the exact fuel required to the injectors to run the engine properly.
Does this sound right? Is this how it should work??
| | | | | Joined: Feb 2003 Posts: 452 Shop Shark | | Shop Shark Joined: Feb 2003 Posts: 452 | I'm no FI guru, but it sounds right. Get the right fuel pressure to the rail and the stock regulator should send excess fuel back to the tank. The engine should perform as it was in the Astro. The only concern I would have (and it's probably no concern at all) is if the weight or torque requirements for the truck are significantly different than the Astro. Then the computer map may not be right. I really believe that is a non-issue, though.
Good luck with the swap.
Current fleet (subject to change w/o notice) \'49 GMC 3/4-Ton , 60 Austin Healey Frog-eye Sprite (some assembly required), 2011 Dodge Avenger, 2015 Jeep Cherokee. No, they don't all run. My other ride is a (B737)no, (B767)no, A320.... Update... was Embraer E190, now Boeing B787. Knowledge is a wonderful thing, but ignorance means you don't know you can't do something.
| | | | | Joined: Aug 2007 Posts: 1,859 Grumpy old guy playing with trucks, cars, and boats | | Grumpy old guy playing with trucks, cars, and boats Joined: Aug 2007 Posts: 1,859 | yes. The TBI units are a 1 bar pump (15 psi) They are also about as easy to install as a carburetor.
I do recommend going to Jagsthatrun.com and picking up the swap manual if you dont have one. they also have other things that you may want - VSS sensors, etc. if you dont have the original trans.
If you have to pull the engine apart for any reason, find a set of 96-2000 vortec cylinder heads and get the appropriate intake. They do breath much better than the earlier heads. Also, you can get a performance EProm from companies such as Hypertech, JET, FAST, Street and Performance, etc.
The problems we face today can not be addressed at the same level of intelligence we were at when we created them - Albert Einstein Or with the same level of $ - Me
| | | | | Joined: Nov 2006 Posts: 324 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 324 | Thanks everyone for the great imput. I really appreciate it. | | |
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