Economy TBI for 292

[CorvairGeek]

Finally getting around to building my economy TBI for my 292 L6.

Got the manifold and a throttle body.

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In case that unit looks small, it is. This is the 2.8/3.1 V6 unit. With the original 1bbl being only rated at 250 CFM, I think the smaller unit is more appropriate for a stock 292. I will be running V8 injectors.

Got a free harness, and then some, from a great guy that had saved too much from parting a '93 Suburban.

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Got everything stripped out and got it to this point. This is where I reconnected the diagnostic terminal to the ECM harness after separating it from the cross-vehicle harness.

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The 'finished' product, ready for a test fit.

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A close up of the speed sensor (VSS) wiring (top left, 2K Dodge speed sensor, speedometer cable driven), and the GMT 400 terminal block. A cable comes up from the starter to power the terminal block. The computer is powered and protected by a fusible link, while the injectors and fuel pump relay are on their own fuses. I added these for troubleshooting.

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Close up of the diagnostic terminal. The wire to the brake switch and the Service Engine Soon light are sticking out of the harness for connection inside the truck.

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Close up of the injector connections, sensor and ground connections. I've got to change the distributor connector (bottom) from the small HEI to the large HEI connector. I may need to lengthen this part of the harness at the same time.

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I intend to run a '427 ECM.

 

[RetroC10Sport]

Definitely following this Jerry.

 

[1987 GMC Jimmy]

What a great idea! I’ll be keeping a close eye on this one as well. If you need a MEMCAL to play with I can send you one. I honestly don’t know if it’s any good, but if you want to try it for whatever reason, it’s yours.

 

[CorvairGeek]

What a great idea! I’ll be keeping a close eye on this one as well. If you need a MEMCAL to play with I can send you one. I honestly don’t know if it’s any good, but if you want to try it for whatever reason, it’s yours.

I appreciate that, but I think I'm good for now. I have collected a few, and do have a '95 TBI V6 MEMCAL which gives me at least one appropriate
CALPAK for limp home.
My dilemma right now is whether I want to go TunerPro RT or Tunercat. I have a MPFI idea on the horizon for the Caprice (still using the LG4, but not TPI), and it will probably be with a '427 computer too.