Dry Nitrous and Injector Duty Cycle - LS1TECH - Camaro and Firebird Forum Discussion



Nitrous Oxide Installation | Tuning | Products

Dry Nitrous and Injector Duty Cycle

Reply
 
Thread Tools Search this Thread
Old 06-16-2017, 08:19 PM   #1
Teching In
Thread Starter
iTrader: (2)
 
2000ssNX20's Avatar
 
Join Date: Oct 2015
Location: MA
Posts: 7
Default Dry Nitrous and Injector Duty Cycle

Brought my stock motor, trans & converter 2k SS to the track last week and ended up running a better time than expected. [email protected]
Only spraying a .55 jet through the MAF sensor. Here's the odd part. Stock injectors and efi live only shows about 82% duty cycle. Shouldn't I be close to 100% with 120ish shot?? How can I tell if it's a false reading ?

Thanks for any ideas,
Shawn

Last edited by 2000ssNX20; 06-18-2017 at 12:10 PM.
2000ssNX20 is offline   Reply With Quote
Old 06-18-2017, 12:14 PM   #2
Teching In
Thread Starter
iTrader: (2)
 
2000ssNX20's Avatar
 
Join Date: Oct 2015
Location: MA
Posts: 7
Default

No thoughts ?
2000ssNX20 is offline   Reply With Quote
Old 06-18-2017, 12:46 PM   #3
LS1Tech Sponsor
 
Join Date: Jan 2009
Location: Santa Ana, CA. USA
Posts: 859
Default Injector Duty Cycle

Hi NX20, yes you have the BEST CORRECT DUTY CYCLE for DRY NOS.
Could this be the reason ?

I manufacture/design Fuel Injectors.

MY REPORT is the most common, BEST, Duty Cycle is from 60-85% with my preference of 80-85%. (NON GDI)

WHEN the Duty Cycle is past 92% the Fuel Injector may STAY OPEN, may operate at x % or other, NOT GOOD.

When at 100% there is NO ACCOUNT for RPM changes, NOT GOOD.

WHEN you state "through the MAF sensor" this could cool the Hot Wire ?

Lance
Pantera EFI is online now   Reply With Quote
Old 06-18-2017, 02:34 PM   #4
8 Second Club
iTrader: (11)
 
AgFormula02's Avatar
 
Join Date: Dec 2003
Location: vancouver, WA
Posts: 595
Default

Quote:
Originally Posted by 2000ssNX20 View Post
Brought my stock motor, trans & converter 2k SS to the track last week and ended up running a better time than expected. [email protected]
Only spraying a .55 jet through the MAF sensor. Here's the odd part. Stock injectors and efi live only shows about 82% duty cycle. Shouldn't I be close to 100% with 120ish shot?? How can I tell if it's a false reading ?

Thanks for any ideas,
Shawn
so the duty cycle is calculated based on how much fuel is being used. But you need something to check it against.

My assumption: Lower duty cycle than expected equals not all incoming air/nitrous being captured by MAF.

Advise: Add a wideband. That will tell you where you are from a fueling perspective. Adjust spray nozzle position to achieve optimum g/cyl calculation.

On a dry set up, nozzle location and angle can have a huge impact on how MAF registers it.
AgFormula02 is offline   Reply With Quote
Old 06-18-2017, 04:57 PM   #5
Teching In
Thread Starter
iTrader: (2)
 
2000ssNX20's Avatar
 
Join Date: Oct 2015
Location: MA
Posts: 7
Default

I wonder if the fact I Mixed VP Unleaded Extreme 110 octane with a specific gravity of .845 could have richned it enough to cover up lack of injector ? Of course I guess it possible that a previous owner had they opened up some as well...

Definitely going to get a wideband and install it before playing around anymore.
2000ssNX20 is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Can injector duty cycle be more than 100%? mike13 Fueling & Injection 11 10-26-2010 04:55 PM
Is 82% injector duty cycle to much? pyro719 LT1-LT4 Modifications 25 07-29-2010 04:56 PM
fuel injector duty cycle and methanol question mike13 Fueling & Injection 9 10-12-2009 05:06 PM
Boost Controller 'duty cycle'. What does that mean? mightyquickz28 Forced Induction 3 03-18-2009 08:34 AM
pros/cons of running bigger injectors teke184 Generation III Internal Engine 14 12-12-2008 08:28 PM


Thread Tools Search this Thread
Search this Thread:

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



All times are GMT -5. The time now is 10:28 AM.


 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: