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"John Slade" <sladerj@bellsouth.net> wrote:
"""
That doesn't sound right. How big is the wastegate, and what style (ie,
throttle plate or Delta-gate (or Race-gate)?
I don't know what a deleta gate is, but the stock wastegate is a flapper. It
doesnt work very well and needs widening.
"""
The Deltagate and Racegate style wastegates both use a poppet valve to allow the exhaust gas to bypass the turbo. The gas takes a rather tortuous path aound the valve and, I suspect, cause quite a bit of back pressure. The Rajay unit typically found on aircraft engines (TSIO whatever) is a throttle plate style wastegate that, IMHO, probably flows the wasted gases much more freely. Turbonetics has come up with a new unit that looks really nice, called their Newgen, and they claim 50% flow improvement with it vs the poppet styled valves... you can read a bit about them on the Turbonetics website.
<Marv>
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