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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