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I think you may be right. It could be that the W/M injection is contributing to the rich condition. Perhaps I should re-tune it to about 12.5:1 WOT WITH the W/M spraying and see what happens. And yes, I do have a wideband AFR gauge in the cockpit and the sensor is located before the cat. Regarding the cat, I do have to keep it to pass emissions, but I believe that with the new cat the flow improved a lot, in fact so much that the turbo started seriously creeping up. We had to cut a much bigger hole in the internal wastegate to keep it "quiet".
Yeah, $700.00 for a tune and I don't think that I can find a cheaper one, not here in So Cal, anyways. So, I must deal with the fact that I just need to dive in and begin to do some tuning work on my own. I can learn a lot in doing so, and I'll eventually have full control of what happens with my system. I have read several articles that suggest that tuning can be achieved without necessarily using a dyno, but rather driving/testing/re-adjusting over and over, provided that you have the pertinent software, a laptop with the necessary interface, a wideband AFR gauge and an accurate boost gauge on board. I have all. I'll keep you posted.
Thanks for the input, mate.
Ever heard of Grange Hermitage?
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