Hi!
I found after datalogging that my max duty cycle was 123 and the max pw was 32. The AFR was fine. Do I need bigger injectors or how I should read those numbers?
Too high duty cycle?
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0). For tuning/troubleshooting questions, please attached a datalog and your MSQ file to your post.
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Too high duty cycle?
Realistically, anything over 90-95% means the injectors are held fully open. If this is only happening on acceleration enrichment, it's probably not a big deal; if it's happening at steady full throttle, your injectors are kind of marginal for this engine and may need an upgrade.
Re: Too high duty cycle?
Ok! I probably need replace my current 36 injectors with 42, because this happened at full throttle, when I was tuning my VE table without AE on. I just afraid, whats is going to happen to my idle with bigger injectors, because my pulse width is now only 1,8ms.
Re: Too high duty cycle?
Can you tell me how many squirts and alternating or simultaneous you are set up for? Thanks, Billk
MSII V3 board, 2.891 revision, 330 inch '56 Desoto Hemi in a '50 Mercury. 350 Chevy throttle body. Stepper IAC. Innovate wide band O2.
Re: Too high duty cycle?
2 Squirts, alternating, 8 injectors,306 cid v8
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: Too high duty cycle?
It should still idle just fine. I've run larger injectors on motors with smaller cylinders.Fairlane wrote:Ok! I probably need replace my current 36 injectors with 42, because this happened at full throttle, when I was tuning my VE table without AE on. I just afraid, whats is going to happen to my idle with bigger injectors, because my pulse width is now only 1,8ms.
Re: Too high duty cycle?
I'll try the bigger ones. Thanks for the answers.