Aussiesvt
Full Access Member
So if I go to the pump and want to run 91 I have to retune the truck??
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If running 93, then assume global spark at +2?
No, you would not. Like @Bulletnjm stated...if you set the global spark plug to -4 (which is the setting for 87 octane) then you are safe to run any octane of gas that you would like, including 91. If you are consistently putting in 91, then I would set the global spark to 0 (which is the ideal setting if you consistently run 91). It is not recommended to set the spark at zero and run 87. You can go with a higher octane than your setting but not a lower octane than your setting.
The safe setting is -4, then you can run any octane and be safe. Then you will not have to switch. Most people however are creatures of habit and basically always run a certain level of octane...in that case, just pick the setting that fits your octane choice and be done.
LOL, arise dead threadBringing this thread from the dead . What’s the latest update on the SVC tune ? I been running mine since day one about 9-10 years now and I would like the updated version. How do I get the v3 or latest ?