Are my injectors aftermarket?

[lordnikon_04]

Ok, i don't know if this will be enough info but, when i took a couple runs at the track the other night and i was sitting at 14 psi the whole way. Meanwhile, my a/f ratio was at 9.1:1 according to link(no wideband yet). My idc's were also only around the 70-75 the entire night. Now from what i can gather, with my fuel being so rich and my idc's being so low for 14 psi, as well as my lack of gas mileage, it all adds up in my mind that i probably have bigger injectors in my car that weren't tuned by the previous owners. Now i'm going to take them out saturday and see if i can figure out what they are for sure, but do you guys think i have aftermarket injectors? And if so, anyone have any kind of guesstimate as to which size they may be?

 

[nates6969]

theres no way to estimate what size injectors you have unless you had a true wideband to give you an acturate a/f ratio. dsm link is terrible at estimating a/f ratio! if you were running 9.1:1 you would be cutting so bad! narrowband o2s are no good however I have tuned with them before but by using voltage rather then a dsm link guestimated number. if your anything over .89-.91 volts at 14psi, you're probably running too rich but really there's no true way to tell w/o a wb.

 

[lordnikon_04]

what about the idc's?

 

[cjridert1]

Can you read the serial # on the side of the top of the injector? That should give you an answer I would imagine.