Auto Tune

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Originally Posted by dbaxter_ss

Not sure why everyone is saying you have to cut the factor and paste in groups.

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Cut and paste in groups is only necessary (to avoid the zeros) if you're using LTFTs to tweak the VE.

For wideband, copy the entire table. :D :D :D :D

SinisterSS, you must have a pretty serious engine if you are able to turn it to 7600, let alone 8000.

There's nothing to see here, move along. :wink:

Lets just call it a very serious valve train, and balls of steel to keep the foot down that long :lol:

To answer Tordne's question.

It’s been a while since I set my laptop up for autotune so Paul or Ross please feel free to edit my mistakes.

Firstly you need to set you pids, If you go into Calculated pids you need to set the Base Efficiency Numerator 1, for me I use an Autronic wide band so mine are set to (Base Efficiency Numerator 1 Autronic) If you are using a LM-1 or PLX Etc, then set the Base Efficiency Numerator 1 in relation to your W/B Afr. If you have been using the W/B to tune in the past then your Wide Band AFR 1 Autronic and Commanded Air Fuel Ratio (as mine is) will have already been set, if not you will need to set those pids. Depending on the witch pin you are connecting you External Voltage to, you will need to set the External analog Voltage 1 or 2 in you External PID selection.
The next step is to open up a blank map (F11) and select an unused map page (like ‘C’ for me was blank). Now enter the map properties (ctrl+enter).
In the Data section in Parameter: scroll down to (0) Base Efficiency Numerator 1- (factor) and select it.
Now go to column and scroll down to (0) Intake Manifold Absolute Pressure (KPA) in the column section. Now open up the EV table in your tuning tool and hi-light the 400 rpm row (just click on 400) now right click it and copy with labels, go back to the map properties and click Paste Labels The Column labels should show 15-105.
Now enter the Row section and scroll down to (0) Engine RPM (RPM) and select it in the Row: section. As we did previously go back to the VE tables and click on the 15Kpa to hi-light all the 15Kpa variable down the RPM scale, now right click and Copy with Labels and go back to the map properties in the scan tool and click Paste Labels. Row labels should show 400-8000 rpm. Now save these properties in the ‘save as’ and call it what ever you like, (Autotune) is what I have saved mine to.
Now with the W/B AFR meter connected to your FlashScan select (in the map page) the Show Average Cell values (ctrl+-) or click on the X with the line above it next to the “N’, you should be in the map page titled BEN_AUT1 (Average), It will show differently with what ever W/B AFR you are using,
Now go back to your tuning tool and select Fuel_trim_Closed Loop Temp Enable. Set these values to 140 degC to stop the engine from going into closed loop. As Ross has stated in previous posts you need to set all the parameters for SD mode. Once you have done that Flash that computer and start recording in the map page, The idea is to highlight every cell without rapid accelerator movement, when you have finished logging press stop while there is some load on the engine so you don’t disrupt the correction factor.
Hi-light the page and click Copy With Labels under edit and go to the VE tables and Paste as Factor with Labels. Under edit.
You should be on your way with AutoTune.

Don’t forget to place the system back into closed loop when you flash the final tune.

I hope this helps.

Cheers, Scotty, ChipControl.

Thanks very much Scoota. That is an excellent write up on what is required.

I have kind of been doing this in an Excel spreadsheet (thanks to Steve Bryant), as has everyone else... The new feature in the Scan tool to apply a filter I expect will help greatly.

I will be off to the dyno tomorrow to see if I can hit all the cells and finally put the VE table to bed, until the next modification of course.

Thanks again.

Sorry Trordne,
When you go into the VE table you need to hi-light them as well and then paste as factor with labels. It's totally up to you whether you smooth out the cells. I’ve achieved the results where Commanded AFR and actual AFR are identical after smoothing although its not really nessesary.

Cheers, Scotty,

Scoota,

Did you re-enable the DFCO options also? When you applied the smoothing, did you apply it with a 'weight' of 100?

Did you, or is it best to, run through this process a number of times (i.e. 2-3 times), or is once enough?

Cheers.

Always re-enable DFCO, Why suck more fuel than you need to. As a rule, I set the smoothing weight to about '10' and smooth it gradually, over smoothing can send you chasing you tail over Air fuel Ratios. Look it doesn’t hurt to go over the VE’s twice just for some fine tuning, ‘I do’. Also the Idea is to not get the air intake temperatures too hot, you will find yourself only doing a couple rows of variables at a time, you don’t want to have too much heat soak in the engine and air temp or you will definitely be chasing that tail, just remember to start logging each row where you ended, say copy and past 2-3 rows at a time, once you’ve done all the rows then smooth them somewhat. Then flash it in and double check it. If you find the A/F to be spot-on then there really is no nead to chew-up Dyno time,

Good Luck, Hop this helps.

Cheers, Scotty.

HAHAHA!!! Dont get your intake to hot, guess us folks with magnachargers will be always chasing our tails.