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 - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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