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Originally Posted by ssrider
I have a 2005 f150 5.4 with a K&N CAI and MBRP exhaust. I'm looking to order a gryphon with custom tunes but I currently have stock tires and plan on upgrading to 33's in a couple months. Would it be better to get the tunes written for the 33's and then adjust the TS down until I get the tires? Or is it better to get the tune written for my current tires and then adjust the TS up for my new tires later? Also is there any harm in using the canned towing tune with these mods or should I also have a custom towing tune written?
Thanks
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I would get the tunes written for the tires you plan to get. Then if you reprogram and forget then your odometer and speedometer will not be as far off. They way I see it you'll have your bigger tires longer than your current ones so have the tune adjusted for it. But in reality it is just one more step either way.
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Originally Posted by gusto
what about gear changes, do you have to get the tunes redone or can you just change it in the menu. I have 32s with 3.55gears but want to keep the 32s and put in 3.73 gears and i have a gryphon with the custom tunes
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The gear ratio can also be changed in the menu.