joey maggs Posted September 15, 2009 Report Share Posted September 15, 2009 ok i posted a couple of times and got some good advice so i hopr i can get some more before i lose my god damn mind. i got an 01 its got t5s, ported, k&n pro air kit,and advanced timing. ok so it had a set 300 mains and was really rich so i put a set of 280s in it and the bottom end was great but the top end was a little poppy.so i put the 300s back in and adjusted the needle and the top end got better but the bottom end sucked, it was real boggy. so my question is should i put 290s in it or put the 280s back? the reason im thinking of putting the 280s back is because my friend said that i should be running 112 with the timing advanced and it could of been detinating? Quote Link to comment Share on other sites More sharing options...
bansheeseat$$ Posted September 15, 2009 Report Share Posted September 15, 2009 If the bottom is boggy you need to change the pilots.Mains dont have anything to do with bottom end fuel delivery. Quote Link to comment Share on other sites More sharing options...
joey maggs Posted September 15, 2009 Author Report Share Posted September 15, 2009 thats what i thought but when i changed my mains the boggyness went away? Quote Link to comment Share on other sites More sharing options...
Building my First Posted September 15, 2009 Report Share Posted September 15, 2009 I don't know t5 jetting but I can tell you that you do not need anything over premium 93 octane unless you have real high compression. You still have stock head? Whats your timing at? Quote Link to comment Share on other sites More sharing options...
bansheeseat$$ Posted September 15, 2009 Report Share Posted September 15, 2009 Do you have needles for the T-5's or are they the stock needles?If they are the stock ones there is your problem.T-5's have a lean spot in them around 4000-4500 rpms.I'm thinking you are in that lean spot and why a bigger main helps. Quote Link to comment Share on other sites More sharing options...
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