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Evo 550cc 2005 injector settings...?
Posted: Mon Jan 14, 2008 10:27 am
by AbeFM
Just got some low impedance injectors from a Lancer Evo - and I want the settings for them, like how much to cut current back, etc.
Anyone know this? Thanks!
Posted: Mon Jan 14, 2008 7:25 pm
by gross polluter
600us @ 14.0v opening time.
Posted: Mon Jan 14, 2008 7:32 pm
by AbeFM
Thanks Nick. Any idea what to limit the current to? That's what I'm really worried about.
Oh, and they are 560s.
Guess I'll use this from the MegaManual:
To run low-impedance injectors with the PWM current limit mode, you need to set two parameters - the "PWM Current Limit (%)" and the "PWM Time Threshold (ms)" - both are on the “Constants” page. The current limit % is the percent duty cycle when the current limit is invoked. The time threshold is the amount of time from when the injector is first opened until the current limit is activated.
Start with:
PWM Time Threshold = 1.0 millisecond, and
PWM Current Limit (%) =
30% on a V3 or V3.57 main board (if you have the active flyback circuit installed).
30% on a V2.2 main board (if you have the separate flyback board installed).
75% on a V2.2 main board (if you do not have the separate flyback board installed).
Once you get your engine idling, then first adjust the PWM duty cycle down in 1% increments until you notice a change in idle quality (be sure to hit the "send to ECU" button each time you change the value). This is the point where the current limit is too much and the injectors are not being held fully open.
Then move the value back up 3 - 5% (for example, if the idle falters at 45%, then put in a number of 48% to 50%).
Move on to adjusting the time threshold. Lower the time threshold by 0.1 milliseconds at a time until the idle quality deteriorates.
Then increase it 0.3 ms.
Now, repeat these steps (starting at #2). Adjust the duty cycle and time threshold alternately to get the optimum values for your set-up. You will converge on a set of numbers that work well for your set-up.
Posted: Tue Jan 15, 2008 12:58 am
by AbeFM
So, I got out on the road, and the car was fine, but nothing I did could keep it from getting super-duper lean at high RPM. About 3-4k it would start falling off, and even with a HUGE step in the VE table, it was lean.
Set the % back to ten, and it's better.
So now I'm stuck not knowing what to get it for, or how to tell. I kinda doubt all the numbers in there, is there some way to characterize this?? I can shoot gas into a jar, weigh it - I can put things on an oscilliscope, I can copy down known good numbers someone has.....
I'm still a little confused how 0% of current flow keeps the injectors open enough to idle. Maybe it's all in the opening time being too long, and the "injection" is zero at that point. Maybe I should set the delay a lot shorter, too?
Posted: Sun Jan 20, 2008 9:58 pm
by sheek
buddy i was trying to figure out the optimum current settings and i gave up and just wired in some resistors and used 100% problems solved.
Posted: Sun Jan 20, 2008 10:33 pm
by AbeFM
Things got a lot stranger, setting them for 0% still let them run fine, though it was a little shakey at top end. Not sure what to make of that.
Posted: Mon Jan 21, 2008 2:56 am
by gross polluter
Can't say for evo injectors, but my stock FC injectors were happy at 30%.
Posted: Thu Jan 24, 2008 3:23 pm
by dcg9381
AbeFM wrote:Things got a lot stranger, setting them for 0% still let them run fine, though it was a little shakey at top end. Not sure what to make of that.
Might post up a photo of the log.
I encountered a lot of variable AFR at the top end of my 2.4L turbo - turns out the map pressure gets a little jagged and was kicking in accel/decel.
Re:
Posted: Wed Sep 13, 2017 10:30 am
by chris_brathwaite
AbeFM wrote:So, I got out on the road, and the car was fine, but nothing I did could keep it from getting super-duper lean at high RPM. About 3-4k it would start falling off, and even with a HUGE step in the VE table, it was lean.
Set the % back to ten, and it's better.
So now I'm stuck not knowing what to get it for, or how to tell. I kinda doubt all the numbers in there, is there some way to characterize this?? I can shoot gas into a jar, weigh it - I can put things on an oscilliscope, I can copy down known good numbers someone has.....
I'm still a little confused how 0% of current flow keeps the injectors open enough to idle. Maybe it's all in the opening time being too long, and the "injection" is zero at that point. Maybe I should set the delay a lot shorter, too?
what what done to solve this problem?