Originally Posted by blownb310

There is one detail that I haven't finished with yet. The VTC system. Throughout all of these years I thought I knew how it worked, but I never really did until now. I always assumed that the intake cam was normally advanced for good off idle and low rpm power, and then retarded for more top end power after a certain rpm. After reading the factory manual, that's not how it works at all. To my surprise the intake cam's normal position is in the top end phase most all of the time. But under certain conditions: [engine coolant more than 158 deg. F, engine load high, and between 1,500 and 4,300 rpm's - and then again after 6,600 rpm's to keep you from blowing it up and warranty claims down] the ecu will turn the VTC solenoid on which advances the intake cam, which in turn shifts the torque curve to a lower rpm in the band. This was quite a surprise to me. I have purchased an adjustable rpm "window" switch and will connect it shortly to turn on the VTC briefly between 1,500 and 4,000 or so like the factory did. Who knows, maybe it will spool the turbo quicker. I'll let you all know how it works out, but frankly I'm not expecting much from it.