Scott-EP

Back on topic

you should be just fine. I ran that same turbo on a CDM manifold at 7psi with a turbonetics wastegate for a while. Not one bit of creep.

delspool

awesome, didnt think id here so much reassurance

BoostForLife

Why was this even asked? at HMT we run what we have.

HiProfile

But with more boost, you also get much more pressure in the exhaust manifold. That extra pressure helps open the valve by itself, and at some point overcomes the spring. Much more so on a weak spring than a high-boost spring.

jee_ewnit

With high boost, less exhaust gases must flow through the wastegate and more gases flow through the manifold and into the turbo, lessening the possibility of boost spike (which was Delspool's main concern). In a low boost situation, the wastegate must bypass a large volume of exhaust gases so that they do not force the turbo to build more boost; but, the manifold itself has less pressure, since it is being bled off by the wastegate . For larger turbo setups, the wategate may not flow (get rid of) enough exhaust gases and boost spike occurs. What you describe is the opposite of boost spike (when a turbo is too small for an engine and boost tapers off when an engine hits is peak volumetric effciency, or when a spring is shitty and too weak to maintain its pressure rating). Boost tapering off is not Delspool's current problem. Also, the exhaust gases don't actually push open the wastegate valve, only pressure from vacuum lines from the boost piping/intake manifold is involved in overcoming the strength of the spring and opening the valve.

enikolayev

exhaust gasses cannot overcome the spring, it is opened with boost pressure. First try to open the wastegate by hand, then try to hold the pressure in the manifold with that same hand, then come back here and tell me which was harder to do.

I second Jee ewnits notion.

turbob16hatch

i'm suprised jd hasn't come in this thread

HomeMadeTurboz

Also too little turbo, for example an HX-35 beyond 50psi starts to snap shafts.

Tom-Guy

Try this on for size: you're a dumbass.

LilWayne

LOL