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Hmmm so maybe I got confused between 10deg BTDC and ATDC

With the base timing set correctly plus the MAP in the right port, we're idling still at 22.4 AFR but we're smooth, no hickups and will rev.

I'll have to recalibrate my O2 sensor, maybe give it a wipe down. I know Frankie doesn't idle at 22.4, he won't idle much higher than 13.5 on my old ECU. 50deg advance seems like too much for a VW motor, I'll look through the stock tune and see what it should be idling at when cold.

Biggvl, its driven by frustration! trust me!

Reading that afr off a guage or off the data stream?

Gauge, innovate I think the brand is.

When setting the base timing are you in diagnostic mode?
Go straight to 12P. At least then you can get some good logs AND have the wideband signal in the data stream. Good for reviewing later at times like this when there's lots going on.

Not in diagnostic mode, but with the ECU spark signal removed (unplugged) it defaults to the falling edge of the reluctor signal which is static.

It has been suggested that 12P is not suitable for TBI, at least the AE component of it anyway. I'll have a fiddle with the injector multiplier to see if I can bring the AFR down and pull 10 or so degrees to keep the VW happy. I'll also need to add the MAT sensor before running 12P

The Manx project mentioned earlier suggests the stock timing and fueling of the PFI ran fine on the VW. 50degrees to me seems far too much for the poor beetle engine... I'll tune for max manifold vacuum and see where I end up.

I pulled the wideband and put it in the exhaust of my dirtbike. It reads a nice healthy 11:1 so that confirms my sensor is still working. As I pulled the sensor out I noticed the left bank exhaust was only warm where the right was hot enough to burn. It was running on 2 cylinders

After a double check and correct of plug leads 3+4 we're back on track. She starts, revs and runs pretty good! Idle sits around 13.5 and drops to around 12 with around 3000rpm. Very rich but very responsive.

Quick question with Kinjflow. Raise the number to richen the AFR? Thought it might have been g/sec as the text field suggests but that wouldn't be a very handy number for the ecu to reference. More likely is required fuel for WOT at 100% VE. I'll have a fiddle and flash it to my NVRAM

One perculiar thing, after an idle for about 10min the mixture gets leaner and leaner, towards 15.1. It could be the temp sensor heating up but I removed it and placed it in the cooling duct (ambient temp) and it still happens. Could it be closed loop learning or something? My O2 wire is disconnected.

And another, after a good blip of the throttle, the idle motor opens up and it sits around 1600rpm for about 30seconds then closes back down to a nice idle. Ideas?

You need to get data logging happening and connect the wideband to the delco so its in the datastream. As for kinjflow there is a spreadsheet calculator to set it based on the flow rate data you have, then move on to the ve. If you run out of ve you can tweak it. 30 seconds is cold start enrichment decay. Do your tuning warm then look at those kinds of modifiers to dial them in.

When you start motor for 1st time after having the power off you have to reset the throttle body. On start up hold the revs over 2,000 for 10 seconds and then drop the the revs to idle and you'll hear it adjusting itself

antus wrote:You need to get data logging happening and connect the wideband to the delco so its in the datastream. As for kinjflow there is a spreadsheet calculator to set it based on the flow rate data you have, then move on to the ve. If you run out of ve you can tweak it. 30 seconds is cold start enrichment decay. Do your tuning warm then look at those kinds of modifiers to dial them in.

It's running $54 so not much logging happening yet. I was looking at the '% coolant contribution to charge temp' in the TBI binary and its 99.61 across the board. Will this be satisfactory when I migrate the tables to 12P? Until I get my MAT sensor at least?

Is vehicle speed important in 12P?

HQ355 wrote:When you start motor for 1st time after having the power off you have to reset the throttle body. On start up hold the revs over 2,000 for 10 seconds and then drop the the revs to idle and you'll hear it adjusting itself

That is freakin' cool!!!! Now I need to go find my tacho...

VSS isn't critical - it helps situations like coasting to a stop, but plenty of 12P conversions don't use a VSS.
Not sure about $54, but with 12P you only need to blip the throttle to get the revs over 2000 to reset the IAC, you don't need to hold it there.