Help with tuning

[VL400]

Some flow data in this .. http://www.fiveomotorsport.com/bosch-bm ... -injectors

[darky82]

How do i find the duty cycle of the injector in tunerpro

[antus]

Its part of the logged data, give it a launch and WOT and see what the logs say.

[darky82]

What am i looking at injector BPW its in msec?

[Holden202T]

depends how you view it, monitor screen or hisotrgram can all do it, also in the dash view.

in this example picture, bottom row third in from the left. for the record this is a ecotec v6 in my torana with free flowing exhaust and stock injectors ... so injectors are big enough, but not alot of room for increasing hp before they will get maxed.

[yoda69]

Basic equation for how long you have to get the fuel in in BPW(msec) is:

(60*2*1000*DC)/RPM
DC is duty cycle 80% would be entered as 0.8
RPM is engine revs.

This is for a four stroke engine.
At 80% duty cycle and 6000RPM you have:
(60*2*1000*0.8)/6000 = 16msec

Hope this helps, with a bit of work can add to TP ADX as an equation as you know BPW and RPM can rearrange equation to get duty cycle if it's not in the data stream already.

Yoda69

[darky82]

[yoda69]

Looks like I confused you well.
Basically the time between 1 particular cylinder firing once until the next time it fires is how long you have to get fuel in. As the RPM increases this time gets shorter, until you get to a stage that the injector doesn't have time to close before it is required to open again, hence why 80% duty cycle is normally considered to be about the max you want to go to.

Yoda69

[darky82]

I dont don't understand the equation?

also you someone asked about my iac, having issues, I set it than it's back on 0 steps at idle.
It moves around when driving.
And I get readings from 0-198+, so I guess it's working just won't stay where I put it.

[VL400]

I dont don't understand the equation?

Yodas example is to calculate how much time you have available for an injector pulse at a certain RPM for 80% DC. Makes it simple to see if your requested injector pulse is going to leave enough spare time.

To calculate DC you know how long you have per rev (from RPM) and how long the injector has fired (the BPW), and its a simple ratio of the two. Example...
6000RPM
7ms Injector Pulse

6000/60 = 100 revs per second
1/100 = 10ms per rev
7ms injector pulse per rev / 10ms of available time = 70% duty cycle

also you someone asked about my iac, having issues, I set it than it's back on 0 steps at idle.
It moves around when driving.
And I get readings from 0-198+, so I guess it's working just won't stay where I put it.

Yeah it does not seem to be working, have suggested how you can test it. Should also be getting a fault code from it not being able to target an idle RPM.