I have a question regarding the duty cycle reading on the Sprint RE. I have 820cc primary injectors and 1000cc secondary injectors. At 13 psi / 7000rpm with my 60-1 (BNR Stage 4.5) turbo, my duty cycle never goes over 55%. The wideband reads 11.3 - 10.9; however, I figured with these injectors the duty cycle will be a lot higher. The 1000cc injectors do have resistors wired in. Can any tuners chime it and let me know if that duty appears to be in the ball park for this boost level on this compressor and injector combination. The engine has 9.4:1 rotors as well.

I can post up a data log if needed. I am also running the 02 correction function which reads about -3% at that level.

Thanks in advance.

 

Dont worry about it. You have nearly 2x the stock injectors. Are your injectors low imp

 

Primaries high imp, secondaries are low imp with resistors.

 

I did some testing with resistors on injectors, and had some very interesting results.

Running with resistors affects both opening and closing times, and increases the variation from injectors to injector. Really you just can't predict the injector behavior. Obviously having predictable injector behavior is what you want.

Now this may not be why your DutyCycle is so low, but I just don't understand why people run low impedance injectors when there are so many better alternatives available today.

 

Amen!

 

Everyone is also trying to save $2 after spending $20000