[300zx link - Should the master fuel be this high on a base map?]

On 9/18/2023 at 10:02 AM, Adamw said:

Excel file attached.  Note it is simplified compared to the ecu, it doesnt consider fuel temp or the charge cooling effects of the fuel, fuel press etc, but it will give pretty similar values in most cases. 

 

Injection Calcs.xlsx 14.51 kB · 10 downloads

Replaced the injectors with some brand new Deatsch Werks 740cc injectors.

Car idles at ~ 1 lamba at 17ish ms master fuel, which seems still wrong. From what I work out the number should be closer to 7ms.

Using this file (plus the tune and log attached), I've come to see the injectors are 370cc ish. 

Struggling to think what else is the problem.

I updated the dead time with the supplied values, is there something else I am missing here?

 

lognewinjectors.llgx newtune740cc.pclx

[300zx link - Should the master fuel be this high on a base map?]

Thanks @Adamw, out of interest how did you determine this?

[300zx link - Should the master fuel be this high on a base map?]

Wow time flies. 

@Adamw See attached logs of car idling + map. 

33ms master is what the final number ended up being. 

I have affirmed fuel pressure, and smoke tested the system.

These injectors may potentially NA injectors from this master ms value.

idlewithblip.llgx basemap12_9.pclx idlinglog.llgx

[300zx link - Should the master fuel be this high on a base map?]

@Adamw it was about 3ms at 14.7 afr. 

[300zx link - Should the master fuel be this high on a base map?]

Hi guys small update on this one. 

Got all my parameters wired in IAT, fuel pressure temp etc. 

I have it idling at 14.7 AFR at full temperature. My final master fuel ended up being 38ms..

My fuel pressure was perfect for the entire time @43psi . Thinking I got sold dodge injectors. 

[300zx link - Should the master fuel be this high on a base map?]

Hi guys, 

Got a 300zx running link with nismo 740cc. 

Got it idling at near 14.7 

However I had to use master fuel at 25ms, is this value too high?

I am not sure if there is another issue present as others seem to have a much lower master fuel. 

I've attached the map and a log. 

Cheers. 

fuel25.llgx 300zx.pclx