VEMS Community Forum

Technical => Ignition => Topic started by: ASSA on November 20, 2007, 08:00:31 pm

Title: CA18DET misfires
Post by: ASSA on November 20, 2007, 08:00:31 pm: Hi
My COP's connected through the "Power Transistor" to vems 5v ign outputs
I put 2.5ms dwell time but it still misfires
What is the problem, coils , injectors(550cc venom)?

I post my config too...
200sx_cfg.rar (http://www.hot.ee/zassaz/200sx_cfg.rar)
Title: Re: CA18DET misfires
Post by: [email protected] on November 20, 2007, 11:03:12 pm: Where does it misfire, RPM, load or boost? Can you provide a datalog and MSQ for this please?
You certainly dont need more than 1.9ms but 2.5 wont cause an issue.
Title: Re: CA18DET misfires
Post by: ASSA on November 21, 2007, 12:04:35 am: Quote from: [email protected] on November 20, 2007, 11:03:12 pm
Where does it misfire, RPM, load or boost? Can you provide a datalog and MSQ for this please?
You certainly dont need more than 1.9ms but 2.5 wont cause an issue.
msq, log and idle video http://www.hot.ee/zassaz/200sx_cfg.rar (http://www.hot.ee/zassaz/200sx_cfg.rar)
Misfires at idle and ~1900 rpm too

Then AFR is about 11 it idles properly but then AFR 13.5 and more it misfires or (I don't know what it is)

And more idle log
200sx_3log.rar (http://www.hot.ee/zassaz/200sx_3log.rar)
Driving log
200sx_1log.rar (http://www.hot.ee/zassaz/200sx_1log.rar)
Title: Re: CA18DET misfires
Post by: ASSA on November 22, 2007, 01:07:53 am: Please check my injector and ignition output settings to ...
Title: Re: CA18DET misfires
Post by: [email protected] on November 22, 2007, 04:57:38 pm: Do you have to compress them? If so please use zip I dont have RAR file abilities here.
Title: Re: CA18DET misfires
Post by: ASSA on November 22, 2007, 09:45:04 pm: All files here http://www.hot.ee/zassaz/200sx_1.zip (http://www.hot.ee/zassaz/200sx_1.zip)
Title: Re: CA18DET misfires
Post by: [email protected] on November 23, 2007, 09:25:26 am: If you're using the logic drivers to control the coil you might want to try the stepper outputs, but I think the problem is likely to be related to the configs.

First off, Anti-lag doesnt look to have been switched off correctly, in Extras->Advanced ALS set:
Input channel used to Disabled
Set all of your RPM values to 25500

In your Extras->Launch Control settings:
Set the RPM values to 25500

In Extras->Idle Settings Advance/PID:
Disable your Ignition based Idle control

Looking at your Settings->Primary Trigger Settings I'd set trigger tooth to 2 rather than 3 and reset the TDC after the trigger value to a correspondingly higher number, you ideally want to be around 120 to 60 deg BTDC.
Title: Re: CA18DET misfires
Post by: ASSA on November 27, 2007, 04:32:27 am: It seems that changing Primary Trigger Settings as you told me helps. Missfires age gone ;)
Title: Re: CA18DET misfires
Post by: BenFenner on November 27, 2007, 04:58:59 pm: Another ballin' Rob diagnosis. =]
Title: Re: CA18DET misfires
Post by: ASSA on December 06, 2007, 09:38:38 am: If my ignition sequence is 3-4-2-1 which injector sequence is better ?
Title: Re: CA18DET misfires
Post by: [email protected] on December 06, 2007, 09:54:45 am: Injecting on the firing stroke, as it will give the fuel a lot of time to sit on the back of the inlet valves and evaporate.