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need more details on your setup. are you running a walbro fuel pump. and if you are are you running an adjustable fuel pressure regulator. if you arent running an fpr you WILL run pretty rich. also you said nothing about what tune you were running. are you running an ecu that is tuned for 370s? -10 to 20 is not enough compensation for that. stock is 270 yours are 370. 100cc difference. just to give you an idea. i tuned an sr with s15 480s and a walbro with stock fpr. we had to pull almost 50% out of the fuel. and we were running 11.5 afrs which is where you wanna be under boost. if the fuel pressure were right it would nearly be as bad. my next concern is your o rings. its pretty easy to mess up the o rings on side feed injectors. buddy of mine did a ka-t with 370s and was having this probably. o rings were at fault and never got it right. blew a head gasket a couple days later. you gotta be careful and gotta know what your doing. some more details on your setup would help. and also im assuming your running a wideband. what kind are you using?
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