Can Dashlogic display injector duty cycle? - CorvetteForum - Chevrolet Corvette Forum Discussion



C6 Forced Induction/Nitrous
C6 Corvette Turbochargers, Superchargers, Pulley Upgrades, Intercoolers, Wet and Dry Nitrous Injection, Meth
Sponsored by:
Sponsored by:

Can Dashlogic display injector duty cycle?

Reply
 
 
 
Thread Tools Search this Thread
Old 04-20-2017, 10:45 AM   #1
Wilkinshc
CF Senior Member
Thread Starter
 
Wilkinshc's Avatar
 
Member Since: Dec 2004
Location: Rio Rancho NM
Posts: 526
Thanked 2 Times in 2 Posts
Default Can Dashlogic display injector duty cycle?

I see injector pulse width but I don't see duty cycle? Can you add a formula and if so does anyone have it. I am guessing it is injector pulse width divided by (120/rpm), right?

Thanks

Last edited by Wilkinshc; 04-20-2017 at 07:06 PM.
Wilkinshc is offline   Reply With Quote
Old 04-20-2017, 11:02 PM   #2
Wilkinshc
CF Senior Member
Thread Starter
 
Wilkinshc's Avatar
 
Member Since: Dec 2004
Location: Rio Rancho NM
Posts: 526
Thanked 2 Times in 2 Posts
Default

Can anyone tell how I would type a PID calculation expression to show: Injector Pulse Width divided by (120/RPM). Would this be right? (pid(1008) / (120 / pid(10)) )

Last edited by Wilkinshc; 04-20-2017 at 11:15 PM.
Wilkinshc is offline   Reply With Quote
Old 04-21-2017, 08:21 AM   #3
schpenxel
CF Senior Member
Support Corvetteforum!
St. Jude Donor '15
 
schpenxel's Avatar
 
Member Since: May 2004
Location: Greensboro NC
Posts: 13,873
Thanked 588 Times in 545 Posts
Default

I'm not driving the corvette so I don't have dash logic with me, but yes, it can display anything you can pretty much come up with a formula on. Inj duty cycle is pretty basic.

I can look up the formula tonight if you still need it.

Try what you've got and see what it does. Not going to hurt anything.
schpenxel is offline   Reply With Quote
Old 04-21-2017, 10:46 AM   #4
Tech
CF Senior Member
 
Tech's Avatar
 
Member Since: Jun 2005
Location: St. Louis Missouri
Posts: 4,044
Thanked 119 Times in 107 Posts
Default

IDC is a calculation based upon Inj PW, so it's not quite as easy selecting something from a dropdown.
Tech is offline   Reply With Quote
Old 04-21-2017, 10:51 AM   #5
schpenxel
CF Senior Member
Support Corvetteforum!
St. Jude Donor '15
 
schpenxel's Avatar
 
Member Since: May 2004
Location: Greensboro NC
Posts: 13,873
Thanked 588 Times in 545 Posts
Default

He clearly knows that, thus the reason he's asking for the formula.

There's no reason Dash Logic couldn't add it to the drop down list if they wanted to. Boost, for example, is calculated, and it's in the drop down list
schpenxel is offline   Reply With Quote
Old 04-21-2017, 10:57 AM   #6
Tech
CF Senior Member
 
Tech's Avatar
 
Member Since: Jun 2005
Location: St. Louis Missouri
Posts: 4,044
Thanked 119 Times in 107 Posts
Default

Indeed.. got lazy with this one
Tech is offline   Reply With Quote
Old 04-21-2017, 12:54 PM   #7
Wilkinshc
CF Senior Member
Thread Starter
 
Wilkinshc's Avatar
 
Member Since: Dec 2004
Location: Rio Rancho NM
Posts: 526
Thanked 2 Times in 2 Posts
Default

That formula didn't work. It gave me a number but it went to 100% at part throttle, so I must need to move or adjust something. I will keep working on it but it you have it would sure appreciate the help.
Wilkinshc is offline   Reply With Quote
Old 04-21-2017, 02:07 PM   #8
schpenxel
CF Senior Member
Support Corvetteforum!
St. Jude Donor '15
 
schpenxel's Avatar
 
Member Since: May 2004
Location: Greensboro NC
Posts: 13,873
Thanked 588 Times in 545 Posts
Default

I have some alerts setup for it already so I've got it. I'll look it up tonight.
schpenxel is offline   Reply With Quote
Old 04-22-2017, 02:18 AM   #9
SlowBusa08
CF Senior Member
 
SlowBusa08's Avatar
 
Member Since: Jun 2014
Location: Peoria IL
Posts: 455
Thanked 17 Times in 15 Posts
Default

is there an extra space behind your parenthesis at the end? I didn't check the pid # but that expression looks right,

IPW/(120/RPM)

Last edited by SlowBusa08; 04-22-2017 at 02:34 AM.
SlowBusa08 is offline   Reply With Quote
Old 04-22-2017, 11:57 AM   #10
schpenxel
CF Senior Member
Support Corvetteforum!
St. Jude Donor '15
 
schpenxel's Avatar
 
Member Since: May 2004
Location: Greensboro NC
Posts: 13,873
Thanked 588 Times in 545 Posts
Default

Inj PW by default is in milliseconds and RPM is of course in revolutions per minute. The / 120 part is getting you to revolutions per second (x 2 since you have two revolutions on a 4 stroke to inject fuel), so it's still seconds vs. milliseconds IMO

I'm apparently not using inj duty cycle on mine. The alert I had set was for fuel pressure, not duty cycle, so I don't have the formula in front of me.

You're close, it's just a matter of moving some decimals around now it looks like.

Last edited by schpenxel; 04-22-2017 at 11:57 AM.
schpenxel is offline   Reply With Quote
Old 04-22-2017, 12:43 PM   #11
EnviedC6
CF Senior Member
 
Member Since: Feb 2012
Location: West Chester Ohio
Posts: 123
Thanks: 0
Thanked 3 Times in 3 Posts
Default

The expression would be PW*(RPM/120), which is the same thing as PW/(120/RPM).
EnviedC6 is offline   Reply With Quote
Old 04-22-2017, 02:00 PM   #12
Wilkinshc
CF Senior Member
Thread Starter
 
Wilkinshc's Avatar
 
Member Since: Dec 2004
Location: Rio Rancho NM
Posts: 526
Thanked 2 Times in 2 Posts
Default

Thanks guys ill try that.
Wilkinshc is offline   Reply With Quote
Old 04-22-2017, 04:06 PM   #13
RPOWU8
CF Senior Member
Support Corvetteforum!
 
RPOWU8's Avatar
 
Member Since: Dec 2005
Location: Valley Center CA
Posts: 163
Thanked 5 Times in 4 Posts
Default

(pid(10)*pid(1008)) /1200


(rpm*ms)/1200

Still need to double check by logging but I need to replace an idler pulley that's making alot of noise before I can drive it around.

DJ
RPOWU8 is offline   Reply With Quote
Old 04-22-2017, 09:42 PM   #14
schpenxel
CF Senior Member
Support Corvetteforum!
St. Jude Donor '15
 
schpenxel's Avatar
 
Member Since: May 2004
Location: Greensboro NC
Posts: 13,873
Thanked 588 Times in 545 Posts
Default

The divided by 1200 one should be right. Have to go from seconds to millisecond then x 100 since you want percent so that cancels out 2 of the 3 decimals

I'm going to try it on mine tomorrow also
schpenxel is offline   Reply With Quote
Old 04-26-2017, 02:58 PM   #15
FNBADAZ06
CF Senior Member
 
FNBADAZ06's Avatar
 
Member Since: Jun 2009
Posts: 4,595
Thanked 36 Times in 35 Posts
Default

subd
FNBADAZ06 is offline   Reply With Quote
Old 04-26-2017, 06:02 PM   #16
Wilkinshc
CF Senior Member
Thread Starter
 
Wilkinshc's Avatar
 
Member Since: Dec 2004
Location: Rio Rancho NM
Posts: 526
Thanked 2 Times in 2 Posts
Default

Quote:
Originally Posted by FNBADAZ06 View Post
subd
Sorry, what does that mean?
Wilkinshc is offline   Reply With Quote
Old 04-26-2017, 06:08 PM   #17
Tech
CF Senior Member
 
Tech's Avatar
 
Member Since: Jun 2005
Location: St. Louis Missouri
Posts: 4,044
Thanked 119 Times in 107 Posts
Default

Quote:
Originally Posted by Wilkinshc View Post
Sorry, what does that mean?
He wants to be notified of replies. Short for "subscribed". You can sub to a topic without posting, but some people (like me) look at recent threads you've posted in on a regular basis.
Tech is offline   Reply With Quote
Old 04-27-2017, 01:28 PM   #18
ls1wolf
CF Senior Member
 
ls1wolf's Avatar
 
Member Since: Oct 2005
Posts: 573
Thanked 4 Times in 4 Posts
Default

FYI - I've tried just about every combo listed above and nata...

If anyone has any ideas, I'm listening. IDC would be great to see.
ls1wolf is offline   Reply With Quote
Old 04-27-2017, 01:41 PM   #19
schpenxel
CF Senior Member
Support Corvetteforum!
St. Jude Donor '15
 
schpenxel's Avatar
 
Member Since: May 2004
Location: Greensboro NC
Posts: 13,873
Thanked 588 Times in 545 Posts
Default

[injector PW in mins] x [RPM] / 2 * 100

This is the correct formula.

Inj PW will report in milliseconds though so you have to do that conversion (divide by 60000)

Try
pid(1008)/60000 * pid(10) / 2 * 100

That's assuming pid(1008) is inj PW and pid(10) is RPM which I'm not 100% sure of without checking

I'll play around with it when I get home if that doesn't work

Last edited by schpenxel; 04-27-2017 at 01:46 PM.
schpenxel is offline   Reply With Quote
Old 04-27-2017, 01:50 PM   #20
ls1wolf
CF Senior Member
 
ls1wolf's Avatar
 
Member Since: Oct 2005
Posts: 573
Thanked 4 Times in 4 Posts
Default

Quote:
Originally Posted by schpenxel View Post
[injector PW in mins] x [RPM] / 2 * 100

This is the correct formula.

Inj PW will report in milliseconds though so you have to do that conversion (divide by 60000)

Try
pid(1008)/60000 * pid(10) / 2 * 100

That's assuming pid(1008) is inj PW and pid(10) is RPM which I'm not 100% sure of without checking

I'll play around with it when I get home if that doesn't work
OK, I did realize that you need to use "{" and not "["

But do you leave the spaces? Its still showing the formula ....

I must be lost.
ls1wolf is offline   Reply With Quote
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • Can Dashlogic display injector duty cycle?
  •  
     
    Reply

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    What is Too Low of a Duty Cycle for Injectors? LTxDave C4 Tech/Performance 12 02-18-2017 10:21 AM
    injector duty cycle russ472 C6 Forced Induction/Nitrous 1 10-15-2016 09:15 PM
    Alternator Design and Issues dadaroo C5 Tech 12 08-08-2016 08:27 PM
    supercharger tune help jb35007 C5 Forced Induction/Nitrous 2 07-25-2016 04:09 PM
    Water\meth: Do i really need injector duty cycle or boost is just ok ??? always faster C5 Forced Induction/Nitrous 23 02-15-2016 08:53 AM


    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump


    All times are GMT -4. The time now is 04:35 AM.


     
    • Ask a Question
      Get answers from community experts
    What's your question?
    Send