Duty cycle question
Thread Starter
Melting Slicks
Joined: Aug 2000
Posts: 2,009
Likes: 1
From: Springfield MO
Duty cycle question
What duty cycle are chip tuners monitoring during datalogging and what are they looking for. According to my autoXray my duty cycle goes to 100% shortly after WOT. What should I be looking for?
Le Mans Master
Joined: Mar 1999
Posts: 9,653
Likes: 1,671
From: Fort Worth Texas
2024 Corvette of the Year Finalist - Unmodified
2023 C8 of the Year Winner - Unmodified
2020 Corvette of the Year Finalist (stock)
2019 C7 of Year Winner (stock)
Former Moderator
Cruise-In I-II-III Veteran
Re: Duty cycle question (AS84)
I think ideally you don't want the duty cycle of the injectors to be more than 70% or so. If you're hitting 100% then you need larger injectors or more fuel pressure.
Thread Starter
Melting Slicks
Joined: Aug 2000
Posts: 2,009
Likes: 1
From: Springfield MO
Re: Duty cycle question (Marcho Polo)
the odd thing is that the plugs look great and while on the dyno she blew alot of black smoke thoughout the run. The duty cycle I'm reffering to is the CCP, its the only duty cycle I've found on my x ray so i'm assuming were talking about the same one. it reads 0 at idle and when you put your foot in it it maxes out at 100.
Le Mans Master
Joined: Mar 1999
Posts: 9,653
Likes: 1,671
From: Fort Worth Texas
2024 Corvette of the Year Finalist - Unmodified
2023 C8 of the Year Winner - Unmodified
2020 Corvette of the Year Finalist (stock)
2019 C7 of Year Winner (stock)
Former Moderator
Cruise-In I-II-III Veteran
Re: Duty cycle question (AS84)
the odd thing is that the plugs look great and while on the dyno she blew alot of black smoke thoughout the run. The duty cycle I'm reffering to is the CCP, its the only duty cycle I've found on my x ray so i'm assuming were talking about the same one. it reads 0 at idle and when you put your foot in it it maxes out at 100.
CCP will usually only be 0% or 100% I think.... something I don't pay much attention to!
Thread Starter
Melting Slicks
Joined: Aug 2000
Posts: 2,009
Likes: 1
From: Springfield MO
Re: Duty cycle question (Marcho Polo)
Oh i see, I look a little closer. I'm not sure if my X ray will tell me anything but injector pulse. I'll check again though. Thanks guys
Pro
Joined: Jan 2001
Posts: 602
Likes: 0
From: Aliso Viejo CA
Re: Duty cycle question (AS84)
If you have pulse width and rpm, you can calculate duty cycle. See the following link:
http://www.thirdgen.org/techbb2/show...tor+duty+cycle
http://www.thirdgen.org/techbb2/show...tor+duty+cycle
Burning Brakes
Joined: Nov 2001
Posts: 1,241
Likes: 9
From: Houston TX
Re: Duty cycle question (Warlock)
most oem setups force a closing for every cycle. so they will report 100% when the injector isn't really at 100%.
how long the opening/closing cycle takes is injector dependent. this is part of the reason why programming doesn't scale with just corresponding injector size changes in the programming.
just fyi...
how long the opening/closing cycle takes is injector dependent. this is part of the reason why programming doesn't scale with just corresponding injector size changes in the programming.
just fyi...
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski