Guest Anonymous Posted June 10, 2003 Share Posted June 10, 2003 what is a good compression upgrade. but not so much that i cant buy fuel with high enough octane. thanks. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 10, 2003 Share Posted June 10, 2003 (nt) Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 10, 2003 Share Posted June 10, 2003 regular gas. these are my thoughts. It depends on time, money and knowledge. 9:1 with stock head 9.5:1 with stock head and some retarded timing - you will start to ping under certain circumstances. To get full power you will need to run premium and advanced timing 10:1 stock head with premium etc etc. 11:1 with stock head and premium is about the limit. After this you need to research racing fuel to be practical. Most cars I know running 12:1 run race fuel brew. Many prepared cars run 10:1 on stock fuel with combustion chamber re-working. Probably 11:1 is the uppermost for a 2002 with a lot of head re-modification. Remember newer cars running 10 and 11 to 1 have sofistication engine managment systems which monitor a/f ration and listen for signs of pinging and retard timing if it is present. 2002s dont have this advantage. Although it is for a turbo car the idea is the same. Have a look at pauls site. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted June 10, 2003 Share Posted June 10, 2003 URL: http://320i.com/E21%20cylinderhead%20modifications.htm (nt) Quote Link to comment Share on other sites More sharing options...
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