How to deCipher injector duty cycle?
09-18-2008, 07:30 PM
#1
Registered User
Thread Starter
iTrader: (9)
Join Date: Apr 2005
Location: Houston, TX
Posts: 439
Likes: 0
Received 0 Likes
on
0 Posts
How to deCipher injector duty cycle?
Hey everyone.
I was trying to figure out how to get injector duty cycle from my Cipher cable and attempted to obtain it by using the formula I found on post #12 of this thread in the FI section:
https://my350z.com/forum/forced-indu...kit-w-fmu.html
Does anyone know if this is an accurate way to use the injector pulse and the rpm to obtain the duty cycle percentage value?
I was trying to figure out how to get injector duty cycle from my Cipher cable and attempted to obtain it by using the formula I found on post #12 of this thread in the FI section:
https://my350z.com/forum/forced-indu...kit-w-fmu.html
Does anyone know if this is an accurate way to use the injector pulse and the rpm to obtain the duty cycle percentage value?
09-18-2008, 07:34 PM
#2
Registered User
Thread Starter
iTrader: (9)
Join Date: Apr 2005
Location: Houston, TX
Posts: 439
Likes: 0
Received 0 Likes
on
0 Posts
% duty cycle = ( pulse width / period )*100
period = 1/[engine speed (rpm) / 60]
With that calculation and changing units considering that the injector pulses listed are in milliseconds (have no units on my cipher so I don't know) I found the following calculation to give me a value that seems logical:
the amount pulse width/ period /100,000
period = 1/[engine speed (rpm) / 60]
With that calculation and changing units considering that the injector pulses listed are in milliseconds (have no units on my cipher so I don't know) I found the following calculation to give me a value that seems logical:
the amount pulse width/ period /100,000
09-22-2008, 02:39 PM
#7
Registered User
Join Date: Oct 2005
Location: Austin TX
Posts: 216
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by Hal@IP
RPM x PW / 1200 = %DC
Example: 8500rpm x 10ms / 1200 = 70.8% Duty cycle
Example: 8500rpm x 10ms / 1200 = 70.8% Duty cycle
We've been meaning to add that to Cipher for > a year, just hasn't happened. Now we're working on adding logging and map tracing functionality to the V2 ROM editor, so chances are that's where you will see that functionality finally come to be.
Jared@UpRev.com
Trending Topics
09-22-2008, 08:11 PM
#10
Registered User
Thread Starter
iTrader: (9)
Join Date: Apr 2005
Location: Houston, TX
Posts: 439
Likes: 0
Received 0 Likes
on
0 Posts
If I'm not mistaken your SS Box will modify the signal BEFORE it gets to the engine and the OBDII reads AFTER (as an output) as opposed to reading what the ECU is sending although I'm not 100% certain on this.
Can someone from Uprev verify?
Can someone from Uprev verify?
09-24-2008, 09:29 AM
#11
Registered User
Join Date: Oct 2005
Location: Austin TX
Posts: 216
Likes: 0
Received 0 Likes
on
0 Posts
All I ever do w/ a split second is take it out. Never paid any attention to what signals it was modifying.
Jared@UpRev.com
09-24-2008, 01:56 PM
#13
Registered User
Join Date: Oct 2005
Location: Austin TX
Posts: 216
Likes: 0
Received 0 Likes
on
0 Posts
As long as the ECU is still the one driving in injectors, then the Cipher data log will be acurate.
Jared@UpRev.com
Jared@UpRev.com
Thread
Thread Starter
Forum
Replies
Last Post
Colombo
Forced Induction
35
11-09-2020 10:27 AM
ars88
Zs & Gs For Sale
18
04-04-2016 07:52 AM
