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With the SDS system it is an on/off style fast idle valve. Once it hits the preset temperature it closes the valve. The 2 wires on the fast idle are positive and ground, wired through a relay, back to the computer.
The fast idle kicks in for the first 1 to 2 minutes at 1100 rpm, once it hits the 51 Celsius it drops down to 650 rpm. Then it starts to speed up gradually until the car is fully warmed up.
Rpm then is at 1000 rpm.
I've tried putting a restrictor in the fast idle hose filling it with JB weld and drilling a hole until I reached a suitable rpm. This created a hard start issue.
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1988 Porsche 930 Targa - 3.4L Twin Plug Motor, DC 13 Cams, Supertec Head Studs, ARP Rod Bolts, Port and Polished Heads, Garretson Andial Intercooler, GSX 61 BB Stage 5Turbo, Tial F46 WG .8 Bar Spring, PowerHaus Headers, Rarly8 Dual Tip Muffler, MS3 Pro EFI conversion, 85lbs. Injectors, Center Force Stage 2 Clutch , Rebuilt 4 Speed with LSD.
Last edited by jpilcher; 07-13-2015 at 08:20 PM..
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