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Ca18det cant add anymore fuel underboost k 400 still as prob
Posted: Sun May 06, 2012 12:09 pm
by dark_180
I have a ca18det which i cant add anymore fuel at 4000rmp, 4500rmp, 5000rmp and so on. Uder boost the car runs lean when i am under load a/r 19, 22, eg accelaratin hard. I have log my injector duty cycle and is only at 10% when the leaning happens and have tried a diffrent airflow meter. I tried to up the k constant even at 400 it still has a problem but runs super rich 1000rmp to 3500rmp. I test the fuel pump at it holdes presure fine up there as well.please help.
Engine modes
na engine
fmic
E85
750cc injector
z32 airflow meter
standard fuel pump.
gt28 turbo jap.
nistune ecu
splitfire coilpacks
Re: Ca18det cant add anymore fuel underboost k 400 still as prob
Posted: Sun May 06, 2012 5:15 pm
by louiswun
Did you remove the load cut and injector TTP max ?
Also check your neutral switch in Nistune, is it in neutral when boosting ?
Re: Ca18det cant add anymore fuel underboost k 400 still as prob
Posted: Sun May 06, 2012 6:30 pm
by dark_180
hey the load cut is set at 255, where abouts is the neutral switch in the nistune software.
Re: Ca18det cant add anymore fuel underboost k 400 still as prob
Posted: Sun May 06, 2012 7:57 pm
by Matt
What injection time are you seeing in consult? Does it flatten out when you record in the log player, at the same time as AFRs?
Neutral is in the 'consult view' guage panel as an indicator 'light' which goes red when on
How is your fuel pressure on boost?
Re: Ca18det cant add anymore fuel underboost k 400 still as prob
Posted: Mon May 07, 2012 4:25 am
by louiswun
dark_180 wrote:I test the fuel pump at it holdes presure fine up there as well......
750cc injector
standard fuel pump.
You are using E85 ?
Did you check your pre-fuel pump filter and inline fuel filter ? or even pre-injector filter.
I think when you have proper fueling, you will see your standard fuel pump maxed out.
Re: Ca18det cant add anymore fuel underboost k 400 still as prob
Posted: Mon May 07, 2012 9:31 am
by PL
Sure does sound like fuel pressure to me. Have you checked it at full boost?
PL
Re: Ca18det cant add anymore fuel underboost k 400 still as prob
Posted: Mon May 07, 2012 9:33 am
by dark_180
Hey i did a log are and you see the injector duty/timing drop of right at the problem.
Re: Ca18det cant add anymore fuel underboost k 400 still as prob
Posted: Mon May 07, 2012 9:36 am
by dark_180
The log
Re: Ca18det cant add anymore fuel underboost k 400 still as prob
Posted: Mon May 07, 2012 9:39 am
by dark_180
The neutral switch is not on and the injector time does not flatten out it drop out. Fuel pressure on boost is fine.
Re: Ca18det cant add anymore fuel underboost k 400 still as prob
Posted: Mon May 07, 2012 9:45 am
by dark_180
I also add a copy of the map i am using.
Re: Ca18det cant add anymore fuel underboost k 400 still as prob
Posted: Mon May 07, 2012 9:56 am
by PL
I'm not seeing a drop off of injection time in the log other than when the throttle wasn't wide open.
Don't forget also that the CA18 goes from sequential to batch fire. So in the log that's at around 3700 when inj values halve (goes from about 7ms to 4.5 in one line). But that's normal.
PL
Re: Ca18det cant add anymore fuel underboost k 400 still as prob
Posted: Mon May 07, 2012 10:50 am
by bachig24u
the logs indicate a TPS stability issue.