So I'm getting ready to run a high compression low boost set up on E85. I was running 23lb high impedance. I just got some 55Lb low impedance (3ohm). I will be running a single flyback board circuit.
I read through the "injectors and fuel supply".
I'm not sure what the amp requirement for the 4 injectors are to calculate a ballpark (edit: pulse width percent for the pwm setting not fuel pulse width)
on the surface, 12ohm to 3 ohm is 25% so somewhere around 25%+ pwm setting. is it that simple?
low Z injectors, pwm Q's to verify understanding (ms1 v2.2)
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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).
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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weeblebiker
low Z injectors, pwm Q's to verify understanding (ms1 v2.2)
Last edited by weeblebiker on Thu Feb 12, 2009 1:53 pm, edited 1 time in total.
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Matt Cramer
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Re: low Z injectors, pwm Q's to verify understanding (ms1 v2.2)
Usually for the PWM current limiting, you'll start with 30% current limiting and adjust from there.
The pulse width is separate from current limiting. You should get in the ballpark by just scaling Required Fuel as appropriate and adjusting the cranking pulse widths to match.
The pulse width is separate from current limiting. You should get in the ballpark by just scaling Required Fuel as appropriate and adjusting the cranking pulse widths to match.
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weeblebiker
Re: low Z injectors, pwm Q's to verify understanding (ms1 v2.2)
I'm famillier with req fuel and tuning idle pulse width with the HighZ injectors.
So start @ 30% pwm, is that because the required current draw is close to the same for high and low imedance injectors?
So start @ 30% pwm, is that because the required current draw is close to the same for high and low imedance injectors?
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Matt Cramer
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Re: low Z injectors, pwm Q's to verify understanding (ms1 v2.2)
No, it's because this is usually a setting that isn't likely to fry anything when you first crank up the engine, even though it may not be ideal.