Originally Posted by *TOUCH*

hey guys, i just wanted some opinions on this: i have an 86 gxl that has a paxton sn89 supercharger on it with the upgraded impeller (1200 cfm vs. stock 800 cfm) and pulley. although you are supposed be able to run the s/c safely on the stock NA fuel system, i wne t ahead and installed 550 cc secondaries, a walbro 255, and a vortech rising rate fpr, controlled by an S-AFC II (can never be too safe). however i recently blew the motor, although i kno it wasnt due to lean detonation because it was tuned pretty rich. (i beleive it was due to the high compression NA rotors + hot air charge due to lack of intercooler +old age of motor)) either way, while its being rebuilt i went ahead and installed TII rotors (lower compression) and plan on installing a water injection system for EXTRA safety. my question is, should i just upgrade the primaries to 550cc as well, or will this be even more overkill? either way, running too rich wouldnt be a problem since i have an safc, right? thanks in advance

Originally Posted by jackhild59

Most supercharger threads end with a blown engine, this thread starts with one.