I'm going the throw in a new wrinkle. If it's "unburnt fuel" causing the turbo to build boost, how come when I'm jaking down I'm building boost? There is no fuel being injected when I'm jaking. My Western Star will build over 20 Psi of boost when jaking. No wastegate, no variable geometry turbo. Just a simple turbo.
Pressure and flow out the manifold. Under load, more fuel means more combustion pressure, means more boost. The highest your boost will reach is determined by the fuel setttings, or the maximum flow capabilities of your turbo. Or what your heads/head gaskets can handle. :twisted: Polished intake manifolds and polished/coated exhaust manifolds can increase flow volume and velocity, not necessarily increasing boost, but allowing your turbo to flow more freely, giving you the potential to increase the fuel a little more.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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