Lexus RC200T boost problem
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Note: car is RC200T 2016 equipped with BMC in cabin air filter.
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That is pretty crazy to see the turbo gauge act that way. I've had several cars with a turbo over the years. The only thing close was getting the turbo replaced in my 88 Mitsubishi Starion under warranty. The boost was not what it should be and at WOT there was a little oscillation of the max boost but not as bad as yours. The dealer who replaced the turbo did not check / adjust the waste-gate (as they told me when I took it back). I dont see how that could be your issue unless the turbo is going out and the failure is related to the waste gate.
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That is pretty crazy to see the turbo gauge act that way. I've had several cars with a turbo over the years. The only thing close was getting the turbo replaced in my 88 Mitsubishi Starion under warranty. The boost was not what it should be and at WOT there was a little oscillation of the max boost but not as bad as yours. The dealer who replaced the turbo did not check / adjust the waste-gate (as they told me when I took it back). I dont see how that could be your issue unless the turbo is going out and the failure is related to the waste gate.
I hope they will replace my turbo also. And the funny part in my story that is I own that car for less than one year now 👎🏻
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isa (05-03-20)
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Service bulletin is a notice from Toyota/Lexus for dealerships to service these cars for free repair for known faulty parts. It takes a lot for them to happen to become a service bulletin, fortunately enough for us RC owners, the IS vacuum regulators have failed enough to make it a bulletin. This seems to be an issue on a lot of 8AR-FTS motors. Some IS owners have gone through several regulators.
Unfortunately for me, my car is pretty modified so I can't take it in for the free repair so I had to pay out of pocket and swap it out myself.
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First service bulletin was to replace the regulator. Second service bulletin added the hose + regulator.
Service bulletin is a notice from Toyota/Lexus for dealerships to service these cars for free repair for known faulty parts. It takes a lot for them to happen to become a service bulletin, fortunately enough for us RC owners, the IS vacuum regulators have failed enough to make it a bulletin. This seems to be an issue on a lot of 8AR-FTS motors. Some IS owners have gone through several regulators.
Unfortunately for me, my car is pretty modified so I can't take it in for the free repair so I had to pay out of pocket and swap it out myself.
Service bulletin is a notice from Toyota/Lexus for dealerships to service these cars for free repair for known faulty parts. It takes a lot for them to happen to become a service bulletin, fortunately enough for us RC owners, the IS vacuum regulators have failed enough to make it a bulletin. This seems to be an issue on a lot of 8AR-FTS motors. Some IS owners have gone through several regulators.
Unfortunately for me, my car is pretty modified so I can't take it in for the free repair so I had to pay out of pocket and swap it out myself.
My car has a rebuilt title, so they won’t do it for me either. Should I just replace the regulator or the hose as well?
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