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Re: Turbo spools up at idle
I think it has to do with the turbo being a "variable geometry turbocharger". The PCM controls the pitch of the vanes in the exhaust side of the turbo. If I remember correctly, at idle it will cycle the vanes a little bit to help with some problems Ford had with trucks that idled too much and had some issues with the vanes getting stuck due to rust and build up. Cycling the vanes slightly at idle helps alleviate this problem.
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2006 PSD Lariat Supercab with Torqueshift, FX4, snowplow prep, camper package, Banks 4" exhaust turbo back, AFE Stage 1 PG7, Goodyear Wrangler MT/R's, Mag-Hytec transmission pan and rear differential cover, pretty much all the interior goodies you could want
1992 Corvette, automatic, aquamarine exterior with black interior, Grand Sport wheels and tires, Dynotec Engineering distributor, MSD coil and wires, GM Rapidfire plugs, open lid K&N air filter assembly, other than that it is fairly stock
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