2G DSMlink

[GSXvsTSI]

My AF Ratio Est does not match up with my open loop target AFR. Have any of you had this? It is the worst at idle(should be 14.7 but it says 11.3) so the fuel trims are adding a ton of fuel to my car(tuned at 14.7 without the effects of the fuel trims). Should I turn off STFT at idle?

 

[donniekak]

If afrest is far off from what the wideband reads, you have an issue with either the injector, or airflow calibration.

 

[GSXvsTSI]

The car runs pretty good in openloop. It's a SD setup. I have fic 1650 injectors in and the injectors are set at 1650. I can try lowering the injector size.

 

[donniekak]

If the wideband and afrest are close wot, but way off at low load/rpm it's either the injector latency, or low load cells in the ve table.

 

[GSXvsTSI]

The link below shows what I got from FIC on the latency for the injectors. I put those numbers in the direct access InjBatteryAdj. But in the fuel tab I have the global fuel as -73 and the deadtime as 0. Do I need to change the deadtime to somewhere around 500?

 

[GSXvsTSI]

Started messing with the deadtime and it brought the AFRatioEst up but jacked everything else. Tuning big injectors sucks.

 

[Nate355RS]

I almost always get my injector deadtime settings from tuning idle. I'm on my phone so I can't look at the log, but from your post I'd start from ground 0 with your idle tuning. Make sure you BISS is set correctly, adust fueling to get Airflowperrev per rev in the .25 range, then adjust the deadtime to get AFR back in line. Setting AFR per rev is key. Once you get that, then you set deadtime.

 

[GSXvsTSI]

Thanks Nate. Just went back through checking over the simple stuff and my biss is not set correctly, neither is my Airflowperrev. Looks like you found the problem. Thank you.

 

[Chumpaumpalumpa]

http://www.ecmtuning.com/demos/fueltrim.html

Really useful for anyone needing to dial in their FTs. Glad you found your issue.

 

[GSXvsTSI]

I believe my ISC valve is jacked. I was adjusting my BISS and the ISC position was stuck at 63. I will diagnose it with a DVOM later today.

 

[GSXvsTSI]

All the pins tested .40. I'm going to take the throttle body off and try cleaning everything up. If anyone has advise please share.

 

[Chumpaumpalumpa]

All the pins tested .40. I'm going to take the throttle body off and try cleaning everything up. If anyone has advise please share.

Replace shaft seals while its off.

 

[GSXvsTSI]

While I was taking the TB apart I tested to see if the IAC valve went in and out when the car was turned to the on position then back to the off. It just twists a little side to side with no movement in or out.

 

[PlanZero]

Your IAC is on it's way out. Make sure you replace it with a black one, or standard intermotor AC146 or AC99