how do i check Injector Pulse Width on A-Tap?
TECH Enthusiast
Joined: Jan 2002
Posts: 597
Likes: 0
From: Orange Park, FL
Re: how do i check Injector Pulse Width on A-Tap? Yes, use the Inj PW (banks 1 and 2). It will give you readings in milliseconds. Take that number and do the following formula to come up with the average injector duty cycle:
Inj PW x RPM/1200 = Inj DS
For example:
18.22 x 6400/1200 = 97.17% DS
Inj PW x RPM/1200 = Inj DS
For example:
18.22 x 6400/1200 = 97.17% DS
TECH Resident
iTrader: (3)
Joined: Nov 2001
Posts: 979
Likes: 0
From: Richmond, VA Where fast cars, well......are hard to come by.
Re: how do i check Injector Pulse Width on A-Tap? I think the item to check in the list is 'Average BPW bank 1' or something similar.
TECH Resident
iTrader: (3)
Joined: Nov 2001
Posts: 979
Likes: 0
From: Richmond, VA Where fast cars, well......are hard to come by.
Re: how do i check Injector Pulse Width on A-Tap? I think duty cycle over 90% is pushing it. Most try to get around 80%. Over 100% I'd say is the red zone. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
TECH Addict
Joined: Nov 2001
Posts: 2,207
Likes: 0
From: College Station, Tx
Re: how do i check Injector Pulse Width on A-Tap? Yep, 80% is the value to shoot for. For short bursts (1/4 mile, etc.) up to 90-93% will still work - though if you are auto-x'ing, roadracing, silverstate, etc. then they would probably cause problems at that level.
Chris
Chris
Trending Topics
TECH Resident
Joined: Jan 2002
Posts: 754
Likes: 0
From: USA
Re: how do i check Injector Pulse Width on A-Tap? The 80% max duty cycle is what most vendors who make injectors use as a standard.
Having a bit larger injector does no harm and just means if the engine needs that during spiking you have reserve to meet what the PCM is commanding and injectors are not falling behind.
The Bosch SVO #30's are the same design as what is used in the LS1, are fairly cheap about $215 a set and function well. Mine have been used for over 1 year now and no failures even at long distance ORR racing.
They give you about 30% fuel increase so those running 10-15% too lean with a somewhat modded powertrain these will cover that problem and have reserve when highballing it on the track.
Having a bit larger injector does no harm and just means if the engine needs that during spiking you have reserve to meet what the PCM is commanding and injectors are not falling behind.
The Bosch SVO #30's are the same design as what is used in the LS1, are fairly cheap about $215 a set and function well. Mine have been used for over 1 year now and no failures even at long distance ORR racing.
They give you about 30% fuel increase so those running 10-15% too lean with a somewhat modded powertrain these will cover that problem and have reserve when highballing it on the track.
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo TECH Resident
Joined: Jan 2002
Posts: 754
Likes: 0
From: USA
Re: how do i check Injector Pulse Width on A-Tap? You should not run with 90% duty cycles if your injectors are the multitech II design.
Pre 99 cars had the multitech I design, good idea was to have the fuel pass through the injectors coil which kept the coils cool.
The problem was with the crap in todays gas or from additives they broke down the coil windings.
Multitech II to solve that problem now has the coil out of the fuel stream and thus get hotter much quicker and thus you do not want them running with larger pulse widths for any real timeframe.
The design though allows the injector to react faster in open/close and thus voltage offest changes have no positives to performance.
The longer the pulse width is the more current load on injectors, coils and PCM.
The covers over coils, injectors, fuel rails on C5 might look pretty but I do not use them for it causes more heat built up to all those functions and does not allow any airflow to put heat away.
Hot fuel sitting in injectors after engine is shut down will increase deposit builtup in injectors.
Pre 99 cars had the multitech I design, good idea was to have the fuel pass through the injectors coil which kept the coils cool.
The problem was with the crap in todays gas or from additives they broke down the coil windings.
Multitech II to solve that problem now has the coil out of the fuel stream and thus get hotter much quicker and thus you do not want them running with larger pulse widths for any real timeframe.
The design though allows the injector to react faster in open/close and thus voltage offest changes have no positives to performance.
The longer the pulse width is the more current load on injectors, coils and PCM.
The covers over coils, injectors, fuel rails on C5 might look pretty but I do not use them for it causes more heat built up to all those functions and does not allow any airflow to put heat away.
Hot fuel sitting in injectors after engine is shut down will increase deposit builtup in injectors.
Re: how do i check Injector Pulse Width on A-Tap? if i upgrade to 30 lb. ford injectors, do i need the PCM to get edited?
thanx!
FYI...my pulse width:
18.49 18.42
20.34 20.03
20.71 20.55
21.61 21.33
20.63 20.39
18.05 3.33
22.02 21.93
20.81 20.60
20.81 20.45
20.71 20.40
20.07 16.01
21.79 21.61
20.87 20.68
20.89 20.51
20.80 20.60
20.84 20.51
20.75 20.46
20.54 20.19
thanx!
FYI...my pulse width:
18.49 18.42
20.34 20.03
20.71 20.55
21.61 21.33
20.63 20.39
18.05 3.33
22.02 21.93
20.81 20.60
20.81 20.45
20.71 20.40
20.07 16.01
21.79 21.61
20.87 20.68
20.89 20.51
20.80 20.60
20.84 20.51
20.75 20.46
20.54 20.19
