I'm experiencing a lack of boost after changing gear on my Rev1 turbo engine, which I thought was due to the wastegate sticking open but now not so sure.
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I first noticed this last year with the original CT26 turbo when I was at Snetterton.
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As I lost a few impeller blades I replaced this with a CT20B and took some time to file down the edges of the wastegate flap and the inside of my Ebay downpipe until i was comfortable that it wasn't catching, this was without the exhaust gasket, so including the metal layered gasket when fitting there should have been even more clearance.
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Unfortunately once I was back on the road the same thing was happening.
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Previously with the CT26 I just had stock boost control, now with the CT20B I have a Greddy Profec to try and keep boost limited to 1Bar.
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I see around 15PSI when WOT in say third gear, but as soon as I change up to fourth there is only around 2 or 3psi, unless i come off the throttle for a second or two and then when I go WOT again the boost will build to 14psi+.
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Classic symptoms of a wastegate being stuck.
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So I ordered a new downpipe from BRD and the design is a little different to the classic EBay ones, but still a little tight in the wastegate area.
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I fitted this today and have the exact same symptoms.
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So i'm asking the collective wisdom if there is maybe something else that i'm overlooking as i'm struggling to believe it is is the wastegate sticking still.
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I have checked my recirc valve and it is all clean and moves fine, the only thing I wonder is maybe if the spring is a little weak, I can move this easily by hand, and is maybe staying open after activating.
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Has anybody else had anything similar before
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?