After I had the
Suburban BB tuned, I asked Justin a few questions to clarify the details of the tune for my own knowledge. As well I thought it might be beneficial to anybody else wanting to know what the tune consisted of.
As I said with my Tahoe, and strictly my opinion, but if you are not sure about doing the BB tune either in person or via the AutoCal, just do it. This is one of the best $ mods you could do for your GM. I absolutely love having both trucks tuned and the
Suburban reacts so much better after the tune.
1. Is the AFM deleted? --- Yes sir. AFM is a gimmick on a Suburban (and any full size vehicle of that generation) and potentially detrimental to engine longevity.
2. The tow/haul button is not part of this tune? --- Tow/haul button changes shift patterns only and is left as a towing mode due to the way the 6 speed
transmission is controlled.
3. Tuned for 89, but 87 can be used if needed? --- It is possible, but best to never run 87. The factory tune is not "tuned" for 87, it requires 89 as well for optimal efficiency.
4. What is the torque management? --- All important TM is removed by default (
engine TM). Transmission TM effectiveness is reduced slightly, but that impacts shift feel and timing only.
5. The shift points felt good. Firm but smooth and I saw the tach go up to 5500. --- At WOT, you should see around 5750/5900 depending on the gear you are in.
@BlackBearPerf
