injector duty cycle

spyro · Post by **spyro** » Sat Mar 08, 2008 6:12 pm

i was using hires code before switching to msextra and my duty cycle was between 85/90max
now with ms2 extra i have 130%
and the injectors are noisy compared to hires code
can this be related to injector pwm period ?
ihave 66 thats what is the default and i have high impedance injectors

UnaClocker · Post by **UnaClocker** » Sat Mar 08, 2008 7:01 pm

High impedance injectors don't use PWM. Set the duty cycle to 100% and the time to 25.4ms. That's probably why they are making noise and the duty cycle is artificially high.

spyro · Post by **spyro** » Sun Mar 09, 2008 3:05 am

UnaClocker wrote:High impedance injectors don't use PWM. Set the duty cycle to 100% and the time to 25.4ms. That's probably why they are making noise and the duty cycle is artificially high.

i have them setup like that
i remember that on the hires code i had to disable ae on boost to bring the duty cycle to the correct values , but on ms2extra this option does not exist
on my other topic of the "rpm drops to zero" theres is the msq im using

UnaClocker · Post by **UnaClocker** » Sun Mar 09, 2008 9:03 am

spyro wrote:can this be related to injector pwm period ?
ihave 66 thats what is the default and i have high impedance injectors

So do you have them at 66%, like you said in your first post, or 100% like I suggested and you claim you have them at. You can't be at both settings at the same time.

Post by **jsmcortina** » Sun Mar 09, 2008 9:47 am

The "66" is 66us PWM period. This setting wasn't available on MS1 and should normally be left at the default setting on MS2.

James

UnaClocker · Post by **UnaClocker** » Sun Mar 09, 2008 9:49 am

doh, my bad. Sorry.

Megasquirt Support Forum (MSEXTRA)

injector duty cycle

injector duty cycle

Re: injector duty cycle