Quote:
Originally Posted by 86TOYO2k17
The tunes can either be optimized for 4-2-1 or 4-1 not both, the open flash header they used to create the original tunes, and later revised to be more compatible with both EL and UEL headers but still made around a 4-1 header. At first they had one for EL and UEL but later changed to a more universal one but slightly more optimized for UEL. But the design of the ace header using the OP to increase runner length makes it way too different to use with those tunes.
also anecdotally when i had them custom tune my ace header it took 7 revisions to dial in, and it made a drastic night and day difference in not only overall power, top end pull, torque dip etc..., but also a huge improvement in driveability. I think it would have taken less revisions and i would have noticed much less improvement if the OTS tune was designed around a 4-2-1 design.
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This is exactly why I kept the 2.76 oft tunes and not the v4.....I want a specific header tune not a universal
