Consumer Reports - New Turbocharged Four Cylinders Over Promise, Under Deliver

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02-15-2015, 11:10 PM

#81

kelobro

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Quote:

Originally Posted by bad2000z

I've been preaching this for a while now. Smaller displacement turbocharged engines will get better fuel economy assuming you NEVER get into the boost. As soon as you do, that small displacement turbocharged engine turns into a gas guzzling mf'er. Not to mention many FI engines require premium fuel, which negates the fuel economy gains. For an economical daily driver, I'll take NA all day erry day.

Direct injection solves the fuel quality problem. The GM 3.6L SIDI engine runs great on 87 octane fuel with 11:5 to 1 compression. You can't pre-detonate if the fuel reaches the combustion just in time for combustion. If you want to see your 3.6L run a little stronger, run it on e85. The earlier 3.5L could run e85, but the much higher compression ratio of the 3.6L really brings it to life with e85 fuel.

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02-18-2015, 08:31 AM

#82

assasinator

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im surprised the turbos are not more intelligent.

use a large wastegate and keep it open. keep turbo inlet bypassed and spooled. when load asks for it close the wastegate and bypass valve and poof boost. optics can monitor turbo rpms.

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