ok i got my tune a couple weeks ago and day and night diffrence (thank you allen) well we tuned it for 89 and 93 octane i ran a full tank of 93 while we did the street tune....

then a couple days ago i ran some 89 cause of the gas prices and at half pedel to heavy i could hear the pinging really badly...

what do you guys think??? i ended up putting half a tank of 93 back in the truck to stop the pinging...

does the computer need to still relearn with 89???

 

yes it will take a few miles for the pcm to revert back to the low octane table.

 

ohh ok thanks lance, so i can run the 89 and it will just need to relearn its self?

 

should take a little while but yes. that is if he put in a dual octane tune--( didnt paste the high occtane over low octane) in it