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Old 12-29-2010, 05:22 PM
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Dual TBI Setup

I am sure this has been talked about before on this forum or maybe another. I was kind of curious if it would be plausible to setup a dual tbi setup on a sbc. I know holley makes their 670 cfm throttle body that would be large enough to feed a healthy 383, if their injectors are large enough? I just think it would look cool and be very unique! I think the problem would come in trying to power 4 injectors instead of two? Is there any way to deliver the correct amount of voltage and fuel to two throttle bodies? I don't really want to hear about other fuel system recommendations I am just curious if this would work, or if it has ever been successfully done before?

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Old 12-30-2010, 09:53 PM
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It's possible. You'll need to talk to Bob at dynamic-efi.com. He is an amazing source of information and manufactures the stuff you'll need to make it all work; both hardware and software. Keep in mind you will need to do the tuning yourself, but he has good instructions/definitions/forum support for it.

Even with a single, it will need to be tuned. If you don't, you are leaving a lot on the table. A single TBI would be enough but you'll need to run more pressure to it. If your injectors have the dome top, replace them. They are garbage. When I had my TBI, I just used the Holley TBI and used factory GM injectors and injector pod.

Good luck.
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Old 12-31-2010, 12:01 AM
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GM actually ran a dual TBI setup on the early 3rd Gen F-bodys and 4th Gen Corvettes. It's called the crossfire injection or CFI. I don't think it was around for more than two model years, but I'm not too knowledgeable on the subject.
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Old 01-01-2011, 04:37 PM
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Quote:
Originally Posted by Valkyrie5.7
GM actually ran a dual TBI setup on the early 3rd Gen F-bodys and 4th Gen Corvettes. It's called the crossfire injection or CFI. I don't think it was around for more than two model years, but I'm not too knowledgeable on the subject.
i believe they stopped producing them because they had 2 many problems with them
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Old 01-04-2011, 07:36 PM
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Quote:
Originally Posted by pontiacjosh
i believe they stopped producing them because they had 2 many problems with them
No real problems with the Crossfire but they were designed for fuel mileage and emissions, not power. Crossfires got a bad rap and many who don't know the true facts, perpetuate the falsehoods.
I had one in my 1984 Corvette and it had plenty of power for me, always started well, pulled hard through the gears, and got good mileage when in overdrive. There are limited speed parts because of only being produced for 2 years (1982 and 1984) in the Vettes and maybe a couple of more years in the Camaros.
The 1985 and up fuel injection systems made more power. The crossfires were reliable but AFTER A FEW YEARS, THERE WERE FEWER AND FEWER GUYS WHO KNEW HOW TO TUNE THEM PROPERLY.
Terry
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