Quote:
Originally Posted by Simpler=Better
On my 300D (different engine, I know, I know) I had it setup to relax the turbo on the highway at the flip of a switch. When cruising I ran 8psi, when flooring it I ran 18psi.
A little extra boost can help your efficiency even if you're not completely matching the fuel quantity. You will have to monitor your intake pressure vs exhaust pressure to find the sweet spot.
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I'm not understanding the need to "relax the turbo" on the highway. The road load demand on the highway is only about 15 hp, so the boost would naturally be below 8 psi unless the turbo was exceptionally small and the vanes were closed. I don't believe this would be possible with the typical OE Garrett setup.