Whats have people's experience been with installing brand new injectors (from Coz) without having them ultrasonically cleaned/tested? Apart from the manual test of applying direct 12V on/off several times to check they are not jammed open/closed. Got an upcoming plenum pull with multiple (original) injectors that are already reading 13+ Ohms resistance. My experience from Dwight at EIS has been that ~12 Ohms is showing the injectors are getting pretty tired.
My 615 nismos were new from coz,, didn't test at all before i put them in, never had a problem with them.
When I bought new Nismo 555 injectors from Nengun, I pattern tested myself. Five were good, one was missing about 30 degrees of the cone. It came up good after an ultrsonic clean.
IMO, it isn't worth the risk. Test them and save an engine, or the time to pull them back out later...
ALL injectors should be given a FULL flow test before fitting ... why ... any one of then that flows lean will result in KABOOM ... mega dollar engine failure. I'm surpised you even had to ask.
Thanks for replies, I was originally going to get them flow tested in any case but just wanted validation this was economic sense. I've witnessed a few 'as-new' injectors sitting on the shelf for a few months unwrapped that were jammed closed. I just though that as I hand't had to buy new injectors for several years, that these days they may be pre-checked and sealed airtight before shipping. Obviously not the case and not worth the gamble. Just trying to save the customer some money. Coz has priced a new set of 370CC TT's at $549 + O'rings/insulators. Customer is not interested in the cheaper larger injectors that 90TTZ found from Coz as that requires an ECU remap (further expense). Anyone in Bris have a 2nd hand set for sale that Ohm test well under 12 Ohms... by any chance?
Nismo 555-615 seem to work pretty well straight out the box, +- 3% is about as close as you can get. Besides that new injectors should show no sign of corrosion whats so ever,because there new, corrosion restricts fuel flow through the injector and directly effects the way fuel is atomized. By all means people test your injectors before you drop them in for piece of mind and the $240-250 test fee, which is small potatoes on a big $$ engine. http://www.aus300zx.com/forum/showthread.php?t=248228&highlight=nismo+injectors
