what do they mean?

i pulled out a set with different numbers are they supposed to be same or do they identify injector in any way

and my other 2 sets have same numbers

 

they're just production stamps, they don't signify any flow rate or version.

 

theres no way to identify them by that number?
at least what engine they came from?

because with the obd1 set i didnt have to use fuel multiplier in neptune.

right after i switched to the d16y8 injectors( which are 240cc according to internets)
i have to add 15 fuel trim and increase fueling in the maps just to bring it back to 14.7 idle.
im a bit confused now how that happend..

both using same b16 basemap and no other changes were made

 

Raver, you should know by now every time you change injectors you have to adjust the offset until you get a stoich idle first. If raising the offset leans out the mixture, reduce the flow rate and try again.
They're probably just dirty though, people treat civics like crap. You can have them cleaned and flow tested for pretty cheap, most shops in my area do it for $50.

 

oh yea I was expecting a little bit but they are supposedly 240cc I checked in about 5 different charts and they all show same ( even the ones that were tested by that specific shop)

but I mean 12psi increase in base pressure to bring them back to 14.7 I don't think dirty injectors can justify that.

it was off a 98 civic and the engine was clean there was no buildup anywhere car had body damage.