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<x-charset iso-8859-1>Hello- > > The domie motors were 7.7 and they burned pistons like mad! > > My Square has 7.2 and it knocks on 89 octane... Id never go this high! > > I agree. 68-71 came stock with 7.7:1 and this was dropped in 72 to 7.3:1 > because the octane was already starting to drop 30 years ago. Although they may not be as groovy as they were with TEL, fuels today are much better than they were just after TEL was first taken out of the equation. Another problem VW had was tuning the D-Jet. Because the fuel injection system is 100% analog and 100% open-looped, there is a notable variability from unit to unit. Although you can fine-tune the system with the pressure sensor to match your computer with your engine (and actually change the performance fairly well), VW didn't really do that. The result was that there were a good many systems that didn't run "quite right." This is one of the things that lead to the CR reduction band-aid... Take care, Shad Laws LN Engineering - Aircooled Precision Performance http://www.LNengineering.com ------------------------------------------------ To unsubscribe, E-mail to: <type3-off@vwtype3.org> For more help, see http://vwtype3.org/list/ </x-charset>