djmarch

iTrader: (4)

So I'm looking for new injectors for my GTA and came across 22# Bosch 3 hole and 4 holes injectors. Is there really a difference between the two ? Performance, fuel economy ?

Tuned Performance

iTrader: (92)

The Bosch 3s perform great. I think they are 4 hole contact southbay08 to get a set.

ULTM8Z

Just be cognizant of the fact that you may need to re-tune the ECM after putting in Bosch-III's. Both the injector flow rate (the value in the ECM that optimizes performance may not be exactly the advertised value), as well as what's known as Injector Pulse Width vs Battery Voltage Correction (which, it's off significantly, can HUGELY impact performance in a negative way). Go over to the TPI section as there a couple of threads on the issue.

daferris

iTrader: (8)

Also the small PW values need to be tweaked. I have RBob's P4 system and it's not hard to adjust it's more a matter of finding the values to use was the challenge

ULTM8Z

yeah, generally you zero out the small PW table since the newer injectors don't need any "help" at low pulse widths...

southbay08

22lb bosch with 3 holes??? The 4 hole spray pattern has better fuel atomization.