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Originally Posted by Goingnowherefast
So much misinformation here it's crazy. Hundreds of people have run headers without a tune here. Should he get a tune before he goes WOT? Of course. But claiming you can't run and drive safely it simply false. The ECU does WAY more closed loop than you think everywhere except for WOT.
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I perhaps mistakenly thought '17+ is closed loop even at WOT, all the way to redline. I dyno'd it soon after I got it and both the dyno operator and myself had never seen dead-nuts on A/F, solid flat line just below 13:1, all the way up, identical for 3 pulls.
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OP are you planning on tracking it without a tune? If so why? My initial impressions were that you are wondering if you can drive the car around without a tune but not track it.
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Was planning to dyno it without a tune and see what power, torque and A/F curves looked like and go from there. Figure results will indicate tune is warranted, but I wanna see what it does without a tune first in any case.