Logging problem in Injector duty cycle/time???

Christian · Post by **Christian** » Wed Sep 09, 2009 4:34 pm

Hello

I did a long run with the new wideband connected and noticed that sometimes the values for injection time/duty cycle are odd.

It can be clearly seen at 45 minutes 30 seconds that with full throttle from low revs upward duty cycle is 24% max, then at 2475 suddenly drops to 12%. AFR stays in realistic regions, so I suspect the injector duty to be false.

I used
Nistune 0.9.13.1b
Type 1 V4 board
Techedge 2Y
The car is a european 180SX (200sx here) CA18DET RS13
Adress file is from ROM Pack 2.1 S13_CA18DET_128_E.adr

Cheers
Christian

streetbike · Post by **streetbike** » Sat Sep 26, 2009 2:26 am

same problem but at higher rpm on ca18det too.

seems that it happens at a certain amount of injection. ( switch from sequential to batch fire injection)

Matt · Post by **Matt** » Sat Sep 26, 2009 11:22 am

its the ECU switching injection mode from what I can see....

the raw injection time reported by the ECU changes also, so its not just our duty cycle calculation

see pic

Matt · Post by **Matt** » Sat Sep 26, 2009 11:22 am

also fixed up the navigation on the logger, slider wasnt working too well in a log this size

streetbike · Post by **streetbike** » Sun Sep 27, 2009 11:19 pm

Is there any way to override the calculation to force the real injection time ?

Or is there a fixed factor of "2" between consult and "real" ? so when consult gives 50% duty it is 100% in real ?

Matt · Post by **Matt** » Mon Sep 28, 2009 1:49 am

we would need to know from the ECU that it is switching. im not sure how we could determine this to alter the display so it appears more accurate

streetbike · Post by **streetbike** » Tue Sep 29, 2009 8:10 am

Matt wrote:we would need to know from the ECU that it is switching. im not sure how we could determine this to alter the display so it appears more accurate

I have searched in all my logs If I can see something same each time it happens. but no way.....
It is not RPM based, sure of that .

but I think it is based on the TP, as it happens at low rpms with stock turbo and later with bigger turbo.
about 2500-2700rpm with T25
3200-3500 with my gt2871
and 3800rpm with the gt3071

I thought it was when injector time was above 8ms because on my car, it happens each time before this time.
but I saw on the log above that it happens after 11ms on his car...