[boyt911sc]

Originally Posted by fred cook

When I built my SC engine into a 3.3SS, I was concerned about the larger engine possibly running lean at wide open throttle. After giving the matter some thought, I decided to find a way to activate the cold start valve at WOT to act as a "7th" injector. The end result was actually quite simple. I mounted a spring loaded contact switch on the throttle linkage so that it would be engaged at WOT and provide +12V to the CS valve. The extra fuel from the cold start valve is distributed to the 6 cylinders by way of the aluminum cold start manifold mounted inside the CIS air box. So now, when the throttle is wide open, the switch is engaged and the cold start valve opens. Now, at normal driving speeds, the CIS works normally, but at WOT, the air fuel mixture changes from around 14.5:1 down to about 13:1 or so. This way, when puttering around town the fuel mileage stays up and the car drives like normal. But, nail the throttle, and the engine pulls like a scalded cat all the way up to the ignition cutout set at 7500 rpms. Some pictures:

Fred,

Simply supplying 12 volts power to the CSV when the engine is warm won't activate it unless you provide a separate ground to by-pass the TTS (thermotime switch). Could you elaborate how you were able to make the CSV work as the 7th injector? Actually it is the 7th injector in a CIS. Thanks.

Tony