. Having owned a Spyder for many years (and at one time I had three different turbocharged cars!), I know that turbocharged engines need the steep vacuum advance curve, available with this unit, for normal street driving... as well as pressure retard operation when high power is called for.
. My personal quarantee here is if you buy this unit from me, install and try it for two months. If you don't feel it is worth every penny then return it to me (in new condition of course) for a prompt refund.
. Unit gives about 15 degrees of vacuum advance as well as the factory 10 degrees of pressure retard.
. (If you are interested in adding an electronic device to imulate the vacuum circuit cut-out feature of non-turbocharged engines -to remove vacuum signal to advance/retard unit at idle- then check out Ray Sedman's clever "Vacuum Advance/Retard kit" especially designed to work with our #D-18 unit.):
