Speeduino install update.
Discussion
Belle427 said:
I may be wrong but I don’t think there is a table, you just increase your fuel in the appropriate cells in the ve table and observe the afr.
OK, thanks. I'm reluctant to change anything in the table as it ran OK before. I'll just be trying to add more fuel to mask a problem elsewhere. The big clue is something suddenly changed and made it run super lean. It's off the scale lean. The AFR gauge won't even read it. Should be easy to find but it's beaten me so far.
ric355 said:
Fenderer said:
No I junked it mainly as it was doubtful that Speeduino would be able to control it so I went with a 2 wire Bosch air valve.
But to be honest I have no idea what I'm doing with it. I can't really get my head around how Speeduino is adjusting for the increased air. There doesn't seem to be any table that maps PWM duty with additional fuel.
If I turn the valve off i,e shut it won't idle at all as the base idle speed is too low so it obviously needs some additional air even when up to coolant temp.
It feels like a fundamental lack of fuelling for some reason, but I have a brand new pump, new filter, injector duties look sensible and it's using the same VE values as when it was originally idling OK before this happened.
I don't think it's an WUE issue as it was fully up to temp and not using the curve and still not idling, running lean,
I don't really know where to go with it to be honest.
If you want to e-mail me your tune, drop me a private message and I'll reply which will then get you my e-mail address.But to be honest I have no idea what I'm doing with it. I can't really get my head around how Speeduino is adjusting for the increased air. There doesn't seem to be any table that maps PWM duty with additional fuel.
If I turn the valve off i,e shut it won't idle at all as the base idle speed is too low so it obviously needs some additional air even when up to coolant temp.
It feels like a fundamental lack of fuelling for some reason, but I have a brand new pump, new filter, injector duties look sensible and it's using the same VE values as when it was originally idling OK before this happened.
I don't think it's an WUE issue as it was fully up to temp and not using the curve and still not idling, running lean,
I don't really know where to go with it to be honest.
The PWM valve needs to be set up with the correct frequency first. Info usually available online for best frequency to use. Various will work but it'll be most responsive at the correct one.
There are two ways you can run PWM idle control - either closed or open loop. Stick to open loop when first tuning as closed loop introduces some automatic variation which makes the tuning process more difficult. You need to set the open loop PWM duty table up with a curve that is based on temperature. Note that the idle position of a PWM valve at 0% duty is usually part open.
In terms of how the fuelling is adjusted, as you adjust the opening of the idle valve the position in the VE table will alter because MAP will change. This will reference a different fuelling point. Tuning the idle is iterative; the valve opening changes the VE reference (MAP) which changes the fuelling, which in turn changes the idle speed. You're looking to balance everything out. Tune the hot idle first; this is your baseline VE at 100% gamma i.e. no enrichments
Go through your tune and make sure all closed loop functions are turned off. PID fuelling being the most obvious one in the AFR/O2 menu. Set to "No Correction" but leave the sensor type at wideband.
Typically when stuff goes suddenly lean it's because some sort of enrichment has ended. Especially during warmup. So something to look at would be your warmup enrichment curve. It should end at 100%. If it doesn't, then once above whatever the final temperature point is, fuelling will revert 100% and you'll get a step change in behaviour. When enrichment ends you're back to, mostly, using your VE table by itself, so that's the thing to get right first at fully warmed up temps.
The other thing you can do is look at the Gamma Enrichment value. That tells you what fuelling is actually being applied, and there are a set of gammas that relate to each individual enrichment allowing you to pick apart where the fuelling is coming from. I've mentioned this before - learning to read the datalogs and establish the causes of things is key to getting it tuned well. Set up auto-logging in TunerStudio so you never miss an event. Also, if something happens then hit the space bar; it'll put a marker in the datalog which will then appear as a red vertical line in megalogviewer.
Edited by ric355 on Saturday 28th May 09:56
Will send a message shortly. It's an awfully long time since I posted anything on this but just wanted to post an update to say my Speeduino install is finally up and running and performing really well.
I've still got some tuning to do but the car is already loads better than it ever ran on the 14CUX ECU and the distributor/ coil setup. It starts perfectly, idles cleanly and is much more throttle responsive and generally better to drive.
It's been a massive learning curve and very rewarding. Thanks to ric355 on here, who helped iron out many of the teething problems along the way.
I've still got some tuning to do but the car is already loads better than it ever ran on the 14CUX ECU and the distributor/ coil setup. It starts perfectly, idles cleanly and is much more throttle responsive and generally better to drive.
It's been a massive learning curve and very rewarding. Thanks to ric355 on here, who helped iron out many of the teething problems along the way.
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