Custom Tuning Step 3 of 4

by Michael Decipha Ponthieux
Last Updated: 2018-02-13

This page ONLY applies to those whom were directed here AFTER receiving a custom tune from me and have completed step 2.

WOT Fuel, Spark, and Load Scaling

Now that step 2 is complete and part throttle fuel and spark is dialed in, its time to dial in WOT.

If instructed to do a step 3 with a step 2 in one log skip on down to the line below, otherwise, go ahead and turn the ignition key on and plug the usb cable in, write the tune to the quarterhorse and then start the log BEFORE you crank the engine. Let it sit and datalog until the engine reaches warm operating temperature, DO NOT TOUCH THE THROTTLE, once the engine has reach operating temperature stop the log, zip it, and post it along with the second log we are about to make below (just like step 1 and step 2).

At this point, the engine should be at its normal operating temperature and likely has been idling for at least 10-15 minutes or so.
Remember, the engine has to reach warm stable idle (non surging) before dialing in fuel otherwise the datalog is useless

Now is the time to go for a WOT run, get on the interstate or some other straight highway thats safe to beat on the vehicle with no police, traffic, or wildlife around.
You will need a friend with you to watch the wideband gauge during this time. Get to a remote area and slow down to 30mph, put it in 3rd gear and start the log, as soon as the log starts floor it WOT and hold it there until you reach your shift rpm or 6000 rpm, all the while have your friend watch the wideband to see what AFR its reading from the beginning to the end of your "pull", slowly coast back down to speed and pull over safely to stop the log, you can then post that log, don't forget to zip the log by right clicking and "send to" >> "compressed (zipped) folder.

After you stop the log and unplug the usb cable shut the engine off, check for any coolant, oil, powersteering, or any other leaks underneath the car, pop the hood and make sure nothing has come loose, just give it a good double over again like you did before.

After I review the logs, I'll shoot you back an updated tune so we can proceed.

If NOT USING TunerPro DO NOT forget to zip the log, if its not zipped the forum will not let you post it, so the datalog must be zipped (.zip file), you should be able to right-click on the datalog file and click on "send to" >> "compressed (zipped) folder", then just post the file it created (which will be the .zip file), in your Private Tune Progress Thread.

If using TunerPro the xdl datalog file is already compressed so no need to zip.

If you have any issues along the way don't hesitate to give me a shout on my mobile: five zero four six zero six zero five three two

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