Goodmorning MEXICANPT,
Yes it only works during powershifting and no I can't tell you why it works that way.
But think about it...there is no way you can hold boost on a normal shift because as soon as you let off the throttle to push the clutch in you have already lost turbine speed = lost boost. The automatic equipped cars are programmed to lose torque during the shift to lengthen the longevity of the tranny and I think (not sure) this is changed with the S1, S2 programming.
Deen
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GT, 5-Spd, K&N filter, Stage I, AGP 3147 Big Turbo, DTEC Fuel Kit, Tial WGA, Greddy Profec EBC, DCR 55mm TB, 05 Plastic Manifold, 180 Deg. Stat, CCA FMIC, AMX hard-pipes, Water-Injection, STS shifter, Needswings 3\" DP w/dump and Borla Cat-back, BG Drop Springs, Eibach Sway Bars, Panther alloys & Eagle F1 Max-Performance Tires. Best run to date...12.93 @113.45MPH.
77 Blown Vette-runs 10\'s @ 136 MPH.
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