Power Hungry Performance Forum  

Go Back   Power Hungry Performance Forum > Ford Super Duty & Excursion > 1999 to 2003 7.3L Power Stroke Diesel

1999 to 2003 7.3L Power Stroke Diesel 7.3L Power Stroke Diesel equipped Super Duty and Excursion

Reply
 
Thread Tools Display Modes
  #1  
Old Tue, April 17th, 2012, 11:46 AM
rammertide07 rammertide07 is offline
God & Guns
 
Join Date: Dec 2010
Location: Rogersville, AL / Currently in Pollock, LA
Posts: 307
rammertide07 is on a distinguished road
Default Injector Pulse Width?

Is there any relation in injector pulse width and fuel milage? Seems like the shorter the pulse width, the less fuel going into the cylinder...if I'm thinking injector pulse width is pretty much as its called.
__________________
01 F350 7.3 4x4 CC SRW/3.73/315-75-16/Aeroforce Interceptor/BD Thruster II/ Bellowed Up-Pipes/4" turbo back exhaust/CCV Mod/DIY 6637/FPR Shimmed to 65 PSI/TS chip reburned with PHP tunes (Stock, 40T WITH Whsiper tune, 80DD, 100R, 140Ex, 140SS)/Replaced and Cleaned EBPS & Tube 4-6-12/Zoodad mod/Recon smoked cab lights/MM Hubs/Cowl Hood/HPx
Reply With Quote
  #2  
Old Tue, April 17th, 2012, 09:03 PM
907DAVE's Avatar
907DAVE 907DAVE is offline
BROKE
 
Join Date: Sep 2009
Posts: 1,402
907DAVE will become famous soon enough
Default

Correct, pulse width is a measurement of how long the injector is commanded on. So, shorten the PW and less fuel gets injected.

However, on a HEUI injector, ICP plays a major roll in fuel delivery also. More ICP = more fuel...faster. If PW was to remain constant and ICP was to increase, more fuel will be injected.

Make sense?
Reply With Quote
  #3  
Old Wed, April 18th, 2012, 07:19 AM
rammertide07 rammertide07 is offline
God & Guns
 
Join Date: Dec 2010
Location: Rogersville, AL / Currently in Pollock, LA
Posts: 307
rammertide07 is on a distinguished road
Default

Quote:
Originally Posted by 907DAVE View Post
Correct, pulse width is a measurement of how long the injector is commanded on. So, shorten the PW and less fuel gets injected.

However, on a HEUI injector, ICP plays a major roll in fuel delivery also. More ICP = more fuel...faster. If PW was to remain constant and ICP was to increase, more fuel will be injected.

Make sense?
Kinda, doesn't that just mean the pulses of fuel are the same....just under more pressure with more oil? Or is it squeezing in more fuel with more pressure?
__________________
01 F350 7.3 4x4 CC SRW/3.73/315-75-16/Aeroforce Interceptor/BD Thruster II/ Bellowed Up-Pipes/4" turbo back exhaust/CCV Mod/DIY 6637/FPR Shimmed to 65 PSI/TS chip reburned with PHP tunes (Stock, 40T WITH Whsiper tune, 80DD, 100R, 140Ex, 140SS)/Replaced and Cleaned EBPS & Tube 4-6-12/Zoodad mod/Recon smoked cab lights/MM Hubs/Cowl Hood/HPx
Reply With Quote
  #4  
Old Wed, April 18th, 2012, 08:18 PM
ticopowell's Avatar
ticopowell ticopowell is offline
Grown-up in training!
 
Join Date: Oct 2009
Location: Currently in Tampa FL
Posts: 888
ticopowell will become famous soon enough
Default

I think both come into play, with ICP, more pressure equals more fuel, but the pulse width is still variable based on what the computer says.
Reply With Quote
  #5  
Old Wed, April 18th, 2012, 10:18 PM
907DAVE's Avatar
907DAVE 907DAVE is offline
BROKE
 
Join Date: Sep 2009
Posts: 1,402
907DAVE will become famous soon enough
Default

Quote:
Originally Posted by rammertide07 View Post
Kinda, doesn't that just mean the pulses of fuel are the same....just under more pressure with more oil? Or is it squeezing in more fuel with more pressure?
Sorta, more pressure driving the fuel plunger means more fuel is going to be injected in the same amount of TIME. Remember, pulse width is a measurement of the injector "on" time - regardless of how much fuel is actually being delivered.

Quote:
Originally Posted by ticopowell View Post
I think both come into play, with ICP, more pressure equals more fuel, but the pulse width is still variable based on what the computer says.
Yup, but so is ICP.
Reply With Quote
  #6  
Old Thu, April 19th, 2012, 11:17 AM
rammertide07 rammertide07 is offline
God & Guns
 
Join Date: Dec 2010
Location: Rogersville, AL / Currently in Pollock, LA
Posts: 307
rammertide07 is on a distinguished road
Default

Quote:
Originally Posted by 907DAVE View Post
Sorta, more pressure driving the fuel plunger means more fuel is going to be injected in the same amount of TIME. Remember, pulse width is a measurement of the injector "on" time - regardless of how much fuel is actually being delivered.


So fuel plunger travle depends on oil pressure? I always thought it was the same travle distance each time.
__________________
01 F350 7.3 4x4 CC SRW/3.73/315-75-16/Aeroforce Interceptor/BD Thruster II/ Bellowed Up-Pipes/4" turbo back exhaust/CCV Mod/DIY 6637/FPR Shimmed to 65 PSI/TS chip reburned with PHP tunes (Stock, 40T WITH Whsiper tune, 80DD, 100R, 140Ex, 140SS)/Replaced and Cleaned EBPS & Tube 4-6-12/Zoodad mod/Recon smoked cab lights/MM Hubs/Cowl Hood/HPx
Reply With Quote
  #7  
Old Thu, April 19th, 2012, 06:12 PM
TwinTurbo's Avatar
TwinTurbo TwinTurbo is offline
Stock Sucks!
 
Join Date: Jan 2011
Location: Mid-Western, MN
Posts: 57
TwinTurbo is on a distinguished road
Default

I think i have an analogy that will hopefully clear up any confusion. Say you have a syringe full of water, and you hold your finger over the end. Now push down on the plunger with a light amount of pressure and remove you finger for 1/2 a sec. - the same amount of water will always come out if the pressure and time stay the same. Now increase the pressure on the plunger but keep the time your finger is off the end the same - more water comes out, lower the pressure but leave your finger off the end longer = more water out. Pulse width = time finger is off the end, ICP = pressure on the plunger. Hope that helps.
__________________
Put a Turbo on it!!!!

'95 F-250 Powerstroke, 350,000 Miles, Mods: Phoenix chip, 140V IDM, Diamond Eye DP to 4" straight pipe, CCV mod, Amsoil synthetics throughout.
'04 F-350, XLT Lariat, Powerstroke, CC, Dually, SS exhaust, AirRaid intake and filter, Edge Evolution, PHP FICM programmer.
Reply With Quote
  #8  
Old Thu, April 19th, 2012, 10:12 PM
907DAVE's Avatar
907DAVE 907DAVE is offline
BROKE
 
Join Date: Sep 2009
Posts: 1,402
907DAVE will become famous soon enough
Default

Excellent analogy!
Reply With Quote
  #9  
Old Fri, April 20th, 2012, 07:24 AM
rammertide07 rammertide07 is offline
God & Guns
 
Join Date: Dec 2010
Location: Rogersville, AL / Currently in Pollock, LA
Posts: 307
rammertide07 is on a distinguished road
Default

Quote:
Originally Posted by TwinTurbo View Post
I think i have an analogy that will hopefully clear up any confusion. Say you have a syringe full of water, and you hold your finger over the end. Now push down on the plunger with a light amount of pressure and remove you finger for 1/2 a sec. - the same amount of water will always come out if the pressure and time stay the same. Now increase the pressure on the plunger but keep the time your finger is off the end the same - more water comes out, lower the pressure but leave your finger off the end longer = more water out. Pulse width = time finger is off the end, ICP = pressure on the plunger. Hope that helps.

What 907Dave said!!! Thanks
__________________
01 F350 7.3 4x4 CC SRW/3.73/315-75-16/Aeroforce Interceptor/BD Thruster II/ Bellowed Up-Pipes/4" turbo back exhaust/CCV Mod/DIY 6637/FPR Shimmed to 65 PSI/TS chip reburned with PHP tunes (Stock, 40T WITH Whsiper tune, 80DD, 100R, 140Ex, 140SS)/Replaced and Cleaned EBPS & Tube 4-6-12/Zoodad mod/Recon smoked cab lights/MM Hubs/Cowl Hood/HPx
Reply With Quote
  #10  
Old Fri, April 20th, 2012, 04:08 PM
TwinTurbo's Avatar
TwinTurbo TwinTurbo is offline
Stock Sucks!
 
Join Date: Jan 2011
Location: Mid-Western, MN
Posts: 57
TwinTurbo is on a distinguished road
Default

Just glad I could contribute something useful
__________________
Put a Turbo on it!!!!

'95 F-250 Powerstroke, 350,000 Miles, Mods: Phoenix chip, 140V IDM, Diamond Eye DP to 4" straight pipe, CCV mod, Amsoil synthetics throughout.
'04 F-350, XLT Lariat, Powerstroke, CC, Dually, SS exhaust, AirRaid intake and filter, Edge Evolution, PHP FICM programmer.
Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump


All times are GMT -5. The time now is 07:59 AM.


All Contents Copyright 2008-2020, Power Hungry Performance