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Old 04-30-2019, 06:56 AM   #28
FLYNAVY30
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Join Date: Apr 2013
Location: Austin, TX
Posts: 592
Re: 1972 C20 build and adventure thread

After allowing the self-tuning EFI to learn for 1000 miles, I took it to VA Speed for a final dyno tune to smooth the fuel mapping by hand. The self learning EFI systems are really a 90% solution....they get you very close, but especially with an automatic transmission, having someone who knew what they were doing tweak the fuel and ignition maps, and a few of the shift points, made all the difference in the world. The truck drives like any factory equipped 6.0L LS truck. Through the end of 2015 and most of 2016, I put a fair number of miles on the truck. We drove Norfolk to Boston and then Maine again to visit friends, went up to Charlottesville, and then took the Blue Ridge Parkway all the way down to Asheville and back to Norfolk, then drove from Norfolk out to South Bend, Indiana to unfortunately watch Texas get destroyed by Notre Dame.

The one thing all of this road tripping did reveal was that the brakes needed to be addressed. The truck was factory equipped with front discs and rear drums, all of which were tired and needed work. I'm not particularly savvy on rebuilding drums, so I started searching for a viable disc conversion on the rear. More to follow.....
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1972 C20 Suburban
1964 Corvette Coupe
1997 Lexus LX450
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