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Originally Posted by Sox
As you say, the 0.2 sec is most likely due to the chip, as the 3.9 gears appear to have done nothing at all. This is clearly evident by the lack of improvement in 60' times. MPH is slightly up, again because of the chip.
Something is very wrong with the low end power of your setup, and I'm not confident that it's the extractors. Whilst good headers will improve low down power, the 3.9 gears should have improved 60' times. Something else is wrong here, though I don't know what as yet.
3.9 gears should provide easy wheelspin from a standing start, and you also said you have no traction problems
Have you any more details and history of the car?
Rick.
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A quick question but would the dyno runs not have picked up the lack of torque, like a kick in the curve or something? To have 159kw on tap and tuned properly (as I imagine the chip is spot on) surely it would be quite a bullet?