A quick and easy way to street tune your CSL conversion for drivability.

[Bry5on]

Ah nice! I hadn't figured that out! - that would be great if you could! If we can identify all these factors and how to address them we should be able to come up with a really solid process anyone can follow to do this.


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Ok here we go, set to 00 to disable:

[karter16]

Ok here we go, set to 00 to disable:

Thanks heaps for this - Correct me if I'm wrong but doesn't this straight up disable the lambda controller?

When you were doing your early tuning runs and ended up rich at low RPM how was that presenting to you? Was the lambda integrator reporting 1 for those cells but the wide-band was showing it was actually rich? Or was there some sort of feedback loop where it was being driven rich on each successive run? Just curious as I'm not really seeing that (second scenario) play out for me with this current testing I'm doing. The low RPM idle range has mildly more fuel than the stock CSL tune, but only slightly so and has consolidated around a lambda of 1.0 after 3 tuning runs.

[Bry5on]

Thanks heaps for this - Correct me if I'm wrong but doesn't this straight up disable the lambda controller?

When you were doing your early tuning runs and ended up rich at low RPM how was that presenting to you? Was the lambda integrator reporting 1 for those cells but the wide-band was showing it was actually rich? Or was there some sort of feedback loop where it was being driven rich on each successive run? Just curious as I'm not really seeing that (second scenario) play out for me with this current testing I'm doing. The low RPM idle range has mildly more fuel than the stock CSL tune, but only slightly so and has consolidated around a lambda of 1.0 after 3 tuning runs.

I was doing so much at once back then that I don’t remember what steps I took exactly, but there was some drift with each successive cycle. The car ran fine the whole time, and it presented as stumbling from the transition from cold start open loop to regular closed loop operation, due to a sort of binary change in fueling.

Now that I think of it a little more, this might have only been an issue during AFR based tuning. I tried a bunch of different things to get the transition from part throttle to full throttle AFR right, which is challenging as the DME goes open loop at different relative openings based on RPM. Then the latency from polling the d-bus messes with your numbers.

Perhaps it’s not needed after all, I should have thought more before posting! But tuner beware if you’re using AFR

[MC346]

Hi gentlemen, trying to play catch up as i've just startet following your work. A suggestion i would propose is to deactivate tank ventilation too.

[karter16]

Hi gentlemen, trying to play catch up as i've just startet following your work. A suggestion i would propose is to deactivate tank ventilation too.

Great to have more people looking at this. You raise a very valid point re tank ventilation. What I'm not sure of though is for what period of time it's reasonably safe to disable ventilation for? Does anyone have any thoughts on this? There's certainly easy ways it could be disabled in the partial tune.

I do know for sure that tank ventilation is specifically accounted for in the MAP sensor RF calculations. I suspect that probably the tuning process will get the VE table close enough either way for the MAP sensor to be able to compensate when it's turned back on, but regardless we should try to understand this fully (as I would think those running pure AlphaN could take advantage of this tuning process in similar ways right?)


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[karter16]

I was doing so much at once back then that I don't remember what steps I took exactly, but there was some drift with each successive cycle. The car ran fine the whole time, and it presented as stumbling from the transition from cold start open loop to regular closed loop operation, due to a sort of binary change in fueling.

Now that I think of it a little more, this might have only been an issue during AFR based tuning. I tried a bunch of different things to get the transition from part throttle to full throttle AFR right, which is challenging as the DME goes open loop at different relative openings based on RPM. Then the latency from polling the d-bus messes with your numbers.

Perhaps it's not needed after all, I should have thought more before posting! But tuner beware if you're using AFR

Okay cool - it will be good to get some more feedback from others before discounting this I think, I am but one data point. It has driven me to look further into the lambda controller disassembly which is also a good thing.

It will be good if I can make some progress on the CAN bus message to get fast data acquisition for this as well so we can stop worrying about the data point latency issue.


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[SliM3]

Thanks heaps for this - Correct me if I'm wrong but doesn't this straight up disable the lambda controller?

Yes, that scalar will shut down the lambda controller completely however Lambda regulator shutdown is rpm/rf based. You'll have a blast disassembling the lambda module! I don't miss it one bit, LOL…


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