Feature request: Tool to calculate lambda delay.

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Feature request: Tool to calculate lambda delay.

Postby piledriver » Sat May 06, 2017 1:53 am

It's been talked about as a test mode in the firmware, but it really belongs in Tunerstudio, as VEAL works AWESOME when the delay table is ~correct. A tool to do it automagically would cut tuning time dramatically in many cases.

Preferably user would just enable/disable for a short period as it would probably cause hiccups in normal running, and its not likely to change much unless the motor/exhaust/WBO2 changes drastically.

Plus, it would be a good baseline for the MS3 LTT lambda delay table.
(You could even stuff the results there, at least on MS3s)

Getting the data is probably a bit daunting for new users, even though its not really that hard to do.
(Its also not really documented that you might even need to do it, or how, anywhere)

The default values makes VEAL not work as awesome as it can on anything with long tube headers, at least...
When the delay table is sane, it works almost like magic.
Always doing things the hard way, MS2 sequential w/ v1.01 mainboard, LS2 coils. 80 mile/day commuter status.
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Re: Feature request: Tool to calculate lambda delay.

Postby LT401Vette » Sun May 07, 2017 7:43 am

That has been on the todo list for years, I would think it should finally make it into the next major release.
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Re: Feature request: Tool to calculate lambda delay.

Postby jesse408 » Mon Aug 14, 2017 6:59 am

Lambda Delay Table generator could be VERY helpful. :D
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Re: Feature request: Tool to calculate lambda delay.

Postby Marek » Mon Aug 14, 2017 10:02 am

Would it be possible to use the delay table to generate an "undelayed AFR" output in the datalogs, assuming the datalog is written to with a short time delay?

It'd be so much easier to look at a datalog where AFRs and AFRtargets superimposed properly. In fact, if you could have the option to simply plot the undelayed AFR as a default in MLV, then you could alter the table and check the fit visually.

kind regards
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Re: Feature request: Tool to calculate lambda delay.

Postby piledriver » Tue Aug 15, 2017 1:35 am

AFAIK that is currently the case for logging, and would almost certainly remain so.
The delay time is only really needed when making corrections, so you are correcting the proper cells with the corresponding data.
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Re: Feature request: Tool to calculate lambda delay.

Postby whittlebeast » Tue Aug 15, 2017 5:11 am

I wonder if we could with some sort of test mode. Picture having a TS Button that adds say 15% fuel instantly for say .75 sec. This would be abut 2 AFRs. We could have a Status code for this that sets for this .75 sec. Then just watch the AFR as reported by the O2s. You could do this at several air flows and get the Lambda delay with very little real effort. All we need is a button in the SW and look at the data.

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Re: Feature request: Tool to calculate lambda delay.

Postby Paul_VR6 » Wed Aug 16, 2017 3:24 am

I always just set the rev limiter (fuel cut) to a few different rpms and then hit them at a few different map values. Some engines are fairly stable some change a bit across that range.
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Re: Feature request: Tool to calculate lambda delay.

Postby panel » Wed Aug 16, 2017 10:50 am

Could someone ( Andy or Paul or whoever ) post a pic of what newbies should be looking at to help make our table up ?
Like some arrows pointing at the time and where it drops off etc. Maybe an original table and what a new table should look like after viewing the log.
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