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Hi All, has anyone fitted a Dump Valve to their IS220d in a bid to remove the flat spot under 1600rpm? I know this wont cure the initial run to first gear but once the turbo is runing, it should improve the other gear changes. I have seen a couple of after market electronic Diesel Dump valves but wondered if they are any good for the Lexus?

see Link below


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I don't think it will help as IS220d has the dump valve - I suppose every turbocharged car has it as a standard. The difference between standard and aftermarket is, that standard doesn't blow to atmosphere, and is very silent.

Try to drive with open windows and I am sure you will hear it working.

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