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Originally Posted by gnlw
Thanks for the explanation mustang 67408. As a follow up, I recently put a Magnaflow muffler on (no other mods). I drove the truck for about 100 miles before resetting the ECU. I could swear that my truck pulled harder at full throttle after the reset. If in fact the truck does perform better after the reset, does this mean that the default settings are providing more power than my learned settings? Will my settings eventually adjust back to the "pre-reset" settings anyway? If so, after how many miles will this occur? Thanks in advance for any replies.
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My own personal opinion is "YES" the ECU will revert back to its pre-set settings after a week or so of driving. The initial pulling your felt may diminish after some time.
You havent changed anything electrcial about the ECU so it doesnt know about the muffler. The ECU has perameters progammed into it for a specific exh size designed by Toyota, if you changed this things may feel better for a while, but the ECU is going to try to adjust everything back to its Programmed perameters.
Many people have tried adding RESISTORS to the MAF to "TRICK" the ECU into thinking the truck is running cooler than it really is, this is supposed to richen the mixture and produce more power, but from what I have heard and read, the ECU is smarter than this and after a week or so relearns things and makes everything go back to its initial programming and targets.
I think you need to have another ECU that is programmable or adjustable to actually make more HP and TQ.
Toyota did their homework on these trucks and personnally I dont feel there is much more to extract from them. They are great just the way they are.
S/Cing is a whole nother ballgame.
Just my opinion
Others may know more and share with you.