Fs-Rb20 Manual Gearbox, Ems Stinger V4.
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By Dose Pipe Sutututu · Posted
Post up a showing a a wide RPM range, wastegate duty, timing, TPS, MAP Use 2x rows if you can, easier to read the data. Or just send it to me -
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This issue has been there between twins and singles… it ain’t the hot side. -
This actually makes more sense than what I'm suggesting, which would make me feel happier anyway. I just reached for an idea on the cold side because the tests on the hot side theoretically ruled out WG problems. But now that you mention it, it did bother me that a 12 psi spring on what is supposed to be a good WG setup is on able to get down to 20 psi. That's bullshit. Read that way, that WG is not doing what it is supposed to.
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If you have a valve, set to 12PSi, and when it ramps up, it goes out to 23PSi, and then settles for a consistent 20PSi and thats the lowest it will go, then I'd be suspecting you have an issue getting enough air to flow AROUND the turbo on the hot side. Now, this could directly flow into what GTSBoy is saying, and that's effectively that your skinny ports aren't able to get enough of the air through the head. Remember, boost isn't a measure of air flow, it's a measure of restriction. And if the turbo at max bypass around it is still able to deliver more air than the head can ingest, your boost will be up. In the NEO Head, being NA, you said it's stock, are you on stock cams, and stock springs in it? Have you tried doing a run with the wastegate held fully open start to finish?
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