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Speedy Squirrel Speedy Squirrel is offline
Rocket Scientist
Join Date: Jun 2008
Location: Detroit
Posts: 898
You will definitely need an idle air control (IAC) device of some sort. All engines are consierably "tighter" when they are cold, plus the fuel doesn't vaporize as well when the engine is cold. This adds up to needing more power to idle, which means more air when cold.

I looked around for something on another production car that integrated the throttle and the IAC (some of the GM 3.8L V6 throttle bodies in particular) to adapt to the turbo motor when I started my conversion, but they need to be welded and re-drilled to match the Porsche manifold, and then you have to re-work the throttle linkage. I decided it was too much work compared to just adding the IAC in the stock air line. I bought the Clewett Engineering IAC adaptor (see photo). Problem solved.
Old 08-03-2008, 02:01 PM
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