Feedbacks wanted: fuel injectors from fiveomotorsport.com

[s20004runner]

Feedback wanted on fuel injectors from fiveomotorsport.com

1995-98 T100 1995-98 4-Runner 1995-98 T100, Tacoma 3.4L 6 cylinder Fuel Injectors - Performance Fuel Injectors - OEM Fuel Injector Sets from Bosch Injectors, Siemens, Denso - 23250-62030 54212183 Toyota Tacoma 4-Runner 3.4l

or

UPGRADE Gen III - Toyota Lexus 5VZFE, and early 1MZFE OEM Fuel Injector upgrade. Made in Japan and brand new. - Performance Fuel Injectors - OEM Fuel Injector Sets from Bosch Injectors, Siemens, Denso - Toyota 5VZFE, 1MZFE, 23250-0A010, 23250-20020,


I may even consider #2 as I want to add a supercharger soon.

Thanks in advance

 

[98OzarksRunner]

According to the spec I could find, the 23250-62030 (stock?) flow 240 cc, while the 'upgrade' injectors flow 294 cc. That will cause your 4Runner to run very rich (in open loop or WOT) unless you retune the ECM or run an aftermarket EFI system. Putting in bigger injectors won't give you more power unless 1) you need them (as in increasing airflow, by about 20% in this case - and the deck plate/ISR mod won't increase airflow - that is determined by the engine dynamics or a supercharger) AND 2) you retune the ECM to adjust the mixture for the increased fuel flow through the injectors to maintain the proper AFR (which in this case means shortening the injector firing time to reduce flow by 20% during normal operation).

In short, you won't get any increase in performance without a retune (and a supercharger), but you will burn a lot more gas (at WOT), probably increase engine wear (as the excess gas washes the oil from the cylinder walls when it's running open loop when you first start it), and decrease your power output (rich-running engines make less power at WOT). If you need new injectors, I'd go with the stock replacements (OEM type).

 

[s20004runner]

According to the spec I could find, the 23250-62030 (stock?) flow 240 cc, while the 'upgrade' injectors flow 294 cc. That will cause your 4Runner to run very rich (in open loop or WOT) unless you retune the ECM or run an aftermarket EFI system. Putting in bigger injectors won't give you more power unless 1) you need them (as in increasing airflow, by about 20% in this case - and the deck plate/ISR mod won't increase airflow - that is determined by the engine dynamics or a supercharger) AND 2) you retune the ECM to adjust the mixture for the increased fuel flow through the injectors to maintain the proper AFR (which in this case means shortening the injector firing time to reduce flow by 20% during normal operation).

In short, you won't get any increase in performance without a retune (and a supercharger), but you will burn a lot more gas (at WOT), probably increase engine wear (as the excess gas washes the oil from the cylinder walls when it's running open loop when you first start it), and decrease your power output (rich-running engines make less power at WOT). If you need new injectors, I'd go with the stock replacements (OEM type).

Thanks for the input!

the do you think the first link is a good deal? I think I have a misfire in one cylinder but if I am going to take a part, I may as well change all six.

I have 230K miles on my t4r after all.