What is the maximum injector p/w?
In the logs, it can show injector p/w in milliseconds. How do you convert the injector p/w (in ms) to a duty cycle %? Im assuming the p/w number is the injector "on" time. I just want to know what is the value where your injectors maxed out. Thanks!
|
https://www.rx7club.com/showthread.p...+cycle+formula
Future version of the logger will have an option to display D/C instead of PW. Actually I thought it was there already, but I looked and it's not. |
thanks for the link
so if i understand correctly, the injector pwm signal changes frequency with engine rpm? so the formula would be: Max injector ON time (ms) =120000/RPM the max injector duty cycle for rtek is about 60% (correct me if im wrong), so at 4000 rpm, your injectors will be maxed out at a p/w of 18ms? ([120000/4000]*.6) |
Buy a meter with a Duty Cycle function. Backprobe a primary injector. Observe the reading in percent and ms. Done. Easy and requires no brain strain. Even RS sells meters with duty cycle. By a Fluke though.
|
Calculating the max open time at 4000 RPM
Code:
ms = (1 / (RPM/60) ) * 1000 So if at 4000 RPM you were at 10ms inj PW, and we already calculated the max at 4000 is 15ms Code:
D/C = (PW/max open time) * 100. Edit: I corrected the math as per Henrik |
That thread is not correct. For a rotary, one rotor face goes through an
intake cycle per rev of the eccentric shaft. So the intake phase is 1 / (rpm / 60) * 1000 ms in duration. ie at 6000rpm, the intake phase is 10ms in duration. Duty cycle is then simply the commanded injection time / time available at that rpm. -Henrik |
so i think i got it figured out:
DC = (PW*RPM)/60000 DC= injector duty cycle (decimal) PW = injector "ON" pulse width (ms) but from what ive read on the forums, the max duty cycle is around 60% for the stock ecu? The pocketlogger site says they only raised the injector cap by 5%? So how could it be 90%, or is it a misprint on the website? thanks for the help! |
The "stock ECU only drives the injectors to 60%" is a myth. The stock ECU
will drive the injectors to ~85%, which is why the cap is only raised by the 5%. -Henrik |
ah, sweet, thanks for the info!
|
All times are GMT -5. The time now is 03:56 PM. |
© 2024 MH Sub I, LLC dba Internet Brands