>Amazing. I cannot imagine a 12.5:1 compression motor
>boosting without serious knock. I guess it comes from
>learning by way of my uncle, and his mid 70's ATP turbo'd
>drag bike. His school of thought was along the lines that
>my 8.8:1 was too high. He runs 7:1 and ~20PSI and still
>knocks on lower octane race fuel. (and clicked off low 9
>second runs ~15 years ago)
>
>Has the technology really come this far?

A combination of technology has come that far, and the fact that things we once took for granted did work are now being re-examined with electronics. Example Smokey Yunick was using large scoops on Indy cars before turbos, the pressure at speed was so great the engines wouldn't live. They would lean out and melt. Now in IRL they do just that and they live, and it is because of the electronics. Alot of old ideas are being re-examnined now with a fresh look from the electronics end of things.

>
>If so, i really begin to wonder why some of my fellow
>boosted 420A's can't keep timing above 14* advance @15PSI on
>8.6:1 compression and 93 octane, even after much richening
>of the mixture.

My turbo car is running 28 total advance on 16 pounds of boost on 104 unleaded.

Visit the Howell Automotive Open House August 20th, 2005. The largest gathering of Chrysler 2.0 engines on the planet.

US Small Business Administration Export Business of the Year for 2003

Visit Howell Automotive at www.howellautomotive.com