NHTKID

so heres the deal, for one i know that afr at idle is fine, but there is more to it. not to mention im anal and want the thing running perfect. my car is a stock j4 sr20det with a j4 wiring specialties harness. Its running fine, my plugs are a tad white but nothing TOO terrible, however at WOT my afr is between 11.5-12.. with an occasional 10ish.. This is what has been bothering me though at idle its a consistent 16.4 and from -20 to -15 itll be around 15.7, then from -15 to 5pds of boost part throttle (light load) it actually gets leaner, averages 16.5 to 17.5 with the occasional 18 which is bad. Its funny though, ive gone through 2 coolant temp sensors because when i first start the car even when the motor is warm, itll start and hit 1500 rpms, and slowly idle down like its a cold start lol, during which time the afr's are beautiful, 13.5-14.7 part throttle and wot 10-11.5... so naturally i thought it was that, its been replaced twice with the 96-98 ka24de coolant temp sender (round type, as i have a 97 s13 type x sr)..

im semi dumb founded. any help would be greatly appreciated.




i have also considered the fact that im not COMPLETELY stock and since the ecu is a stock map it might be running lean and i need a tune, is that a possibility?

sr20det blacktop j4
intake
full 3 in exhaust straight pipe
blitz FMIC
walboro fuel pump
z32 fuel filter
hks ssqv bov
vacuum directly to wastegate for 7pds since im having this issue
aem wideband
boost/vacuum gauge
oil pressure gauge