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ULYCYC · 08-09-2004, 02:48 PM

I gal of Xylene added to a tank full of 93 to make 18 gals is only 94.3 octane. You need to have a fixed octane level of fuel of a given amount to figure out a problem. It can be 93 one day then 95 the next. If your boost level and timing is not going along with this you will have problems and also impossible to figure out what's going on. Start with a fresh tank of 93 or what ever is available. Then adjust you boost until you get zero knock at WOT. If you want to increase boost then add the Xylene and up the boost and adj until no knock. When that tank is empty then lower the boost to match the fuel used. The 02 readings are not accurate so don't rely on it.

08-09-2004, 02:48 PM	#3 (permalink)
ULYCYC Fuhgeddaboudit Join Date: Sep 2000 Location: Brooklyn, NY Posts: 16,546	I gal of Xylene added to a tank full of 93 to make 18 gals is only 94.3 octane. You need to have a fixed octane level of fuel of a given amount to figure out a problem. It can be 93 one day then 95 the next. If your boost level and timing is not going along with this you will have problems and also impossible to figure out what's going on. Start with a fresh tank of 93 or what ever is available. Then adjust you boost until you get zero knock at WOT. If you want to increase boost then add the Xylene and up the boost and adj until no knock. When that tank is empty then lower the boost to match the fuel used. The 02 readings are not accurate so don't rely on it. __________________ ED BAKER 87-T, Maplight equipped rear view mirror.. 93 PARK AVE"SUPERCHARGED" BPG#1458 My Photo Page buickperformancegroup.com "As democracy is perfected, the office of President represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."---H.L. Mencken 1927