TBI motor tuning - The 1947 - Present Chevrolet & GMC Truck Message Board Network

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GASoline71

"I ain't nobody, dork."

Join Date: Sep 2007

Location: Whidbey Island, Washington

Posts: 8,930

Re: TBI motor tuning

Quote:

Originally Posted by jollymon02

It is Fitech. Same basic principle. I'm asking if there is a known difference in the tbi vs carb motors calling for different timing for an aftermarket efi. Last distributor car I had was a 70s 2L BMW, so the SBC world is not stored in my brain.

Depending on the cam it's gonna need some advance. Start out with 12 degrees or so. The adjust from there. After a few test runs (driving it with a load on the engine), see where the sweet spot is. Small Blocks love advance. However, the TBI "swirlport heads" might negate the gains a bit. They were designed with the severely underpowered TBI in mind.

Gary

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My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread.

The Rebuild of Creeping Death after the wreck

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Originally Posted by LONGHAIR

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Originally Posted by prostreetC-10

I love using vacuum gauges as part of the carb tuning process. I hook the gauge to the inside of my garbage can and leave it there.

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Originally Posted by Marv D

Remember Murphys 2nd law of mechanical relationships... "OPPOSING COMPONENTS ATTEMPTING TO OCCUPY THE SAME SPACE, AT THE SAME TIME, GENERALLY END UP OCCUPYING ADJOINING SPACE AT THE BOTTOM OF THE OIL PAN"

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Originally Posted by cableguy0

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