Larger Injectors w/o ECU? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

*sykikchimp* · 06-16-2002, 09:38 AM

you will run very rich, and very shitty with no ecu upgrade. The injector pulse width will be the same and the 370cc injectors will flow quite a bit more fuel in the same injector pulse. I heard of someone running 310cc injectors but they said it was still rich, and idle'ed rough..

edit - you might could run them with an adjustable FPR, and turn down the fuel pressure in the rail.  problem #1: It would be hard to get the correct fuel presssure to lower the actual amount of fuel flowing at any given pulse.  Prob #2: I believe the injectors require a certain amount of fuel pressure to function properly.

*Jeff240sx* · 06-16-2002, 12:22 AM

I am looking into buying injectors... and would like to install them and wait for another paycheck untill I send my ecu to JWT.... so that brings me to my next question.
What is the stock flow of s14 sr20det injectors?  370cc I think, right?
So... would a 100cc difference in injector size be a huge problem without a ecu, or should I just wait and do it all at once.  Cuz if I do it all at once, I will wait a long time and buy some 550cc injectors, so I only have to pay JWT once for the reprogramming...
Someone help plz!
-Jeff

06-16-2002, 09:38 AM	#1
sykikchimp WOW addicted Join Date: Dec 2001 Location: the moon Age: 44 Posts: 6,525 Trader Rating: (0) Feedback Score: 0 reviews	you will run very rich, and very shitty with no ecu upgrade. The injector pulse width will be the same and the 370cc injectors will flow quite a bit more fuel in the same injector pulse. I heard of someone running 310cc injectors but they said it was still rich, and idle'ed rough.. edit - you might could run them with an adjustable FPR, and turn down the fuel pressure in the rail.  problem #1: It would be hard to get the correct fuel presssure to lower the actual amount of fuel flowing at any given pulse.  Prob #2: I believe the injectors require a certain amount of fuel pressure to function properly. __________________

06-16-2002, 12:22 AM	#2
Jeff240sx I hate you too... Join Date: Jul 2001 Location: Tampa, FL Age: 42 Posts: 5,828 Trader Rating: (0) Rides Gallery: Jeff240sx Feedback Score: 0 reviews	I am looking into buying injectors... and would like to install them and wait for another paycheck untill I send my ecu to JWT.... so that brings me to my next question. What is the stock flow of s14 sr20det injectors?  370cc I think, right? So... would a 100cc difference in injector size be a huge problem without a ecu, or should I just wait and do it all at once.  Cuz if I do it all at once, I will wait a long time and buy some 550cc injectors, so I only have to pay JWT once for the reprogramming... Someone help plz! -Jeff __________________ Whatup?