There may be something to gain. What do the BLM tables say?
One of the problems with a genaric tune from GM is that they do not know how much weight the engine will be pushing. The general rule for heavy trucks is that they disable the fuel enrichment, because they are afraid that with so much weight, you could run in fuel enrichment mode all the time. If you know where it runs at cruise, you can set the fuel enrichment to turn on, only when you step on the throttle more than your typical cruising position. The other thing that happens is because it is running lean when step on the throttle, they take out a lot of timing to prevent knock. If you can run richer, you can add more timing, which helps throttle response immensely. A custom tune may not help a lot at wide open throttle, but it will likely improve throttle response.
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2004 AllegroBay 34XB Nov 2017 Banks, Front & Rear Trac bars, Konis
Sold:'83 Revcon Prince 31' FWD GM Performance 502 w/Edelbrock MPFI, Thorley Tri-Ys & Magnaflows, 4L85E 4 spd. Tested to exceed 100 mph.
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