Originally Posted by lobuxracer

The primary O2 sensor for each cylinder bank is a wideband planar sensor. The secondary is NB.

It may be possible to have some serious problems if you purchase a junkyard ECM, have it flashed, and then install it. I would not want to be the guinea pig for doing it this way. The key security system is certificate based, and there is a sequence of exchanges that happen between the certification ECU and the ECM before the engine will start. Because of this, it might be necessary to have the "new" ECM installed in the car and registered with the certification ECU for the smart key to work.

I am not 100% certain, but again, I wouldn't want to find out the hard way unless I was prepared to have a Techstream security specialist on hand to make sure nothing goes wrong.

So - update - swapping ECMs (not removing and reinstalling the same unit) means you'll need to initialize the TCM, throttlebody, and write the correct VIN to the ECM. Toyota tech data is very clear this must be done with Techstream. Also, there is a procedure for initializing the ID Code ECU which is the thing generating the immobilization code to prevent theft. This procedure requires you to turn the car on without starting the engine with CG and TC pins in the DLC shorted for 30 minutes. If you don't do this, the engine won't start.

Originally Posted by streetx

welp is more of the fact that you cant maximize the results of a tune unless the car is strapped down to a dyno with the tuner their doing pulls and making adjustments.

Originally Posted by tgui

True, but for various reasons (cat preservation, idiots using low octane) most cars are tuned stupid rich with safe timing. There might be enough wiggle room for a safe canned tune that adds enough to be detected by the butt dyno.

Originally Posted by lobuxracer

Very much agreed. Also keep in mind, fuel will be automatically adjusted based on O2 sensor results to the tune of +/-20% to suit the particulars of the engine. What we're really changing is the target values for the wideband O2 sensors and possibly the base numbers in the fuel maps, but at the end of the day, the ECM is going to tweak based on results, and it will arbitrarily apply the correction factor it calculates in closed loop to the WOT maps because they run in open loop.

All this means is the factory fudges on the rich side in case anything goes wrong at WOT so they're not buying you a new engine for a minor fault or failure. Tuning closer to the edge means you're taking a calculated risk that it may be easier to detonate the engine under WOT conditions if something does go wrong (bad fuel, clogged filter or injector, fuel pump failure, etc.).

Originally Posted by lobuxracer

Very much agreed. Also keep in mind, fuel will be automatically adjusted based on O2 sensor results to the tune of +/-20% to suit the particulars of the engine. What we're really changing is the target values for the wideband O2 sensors and possibly the base numbers in the fuel maps, but at the end of the day, the ECM is going to tweak based on results, and it will arbitrarily apply the correction factor it calculates in closed loop to the WOT maps because they run in open loop.

All this means is the factory fudges on the rich side in case anything goes wrong at WOT so they're not buying you a new engine for a minor fault or failure. Tuning closer to the edge means you're taking a calculated risk that it may be easier to detonate the engine under WOT conditions if something does go wrong (bad fuel, clogged filter or injector, fuel pump failure, etc.).

Originally Posted by ISFpat

If you guys are flying out Taku from Japan to tune your car, what happens when you add a mod and need to retune it? I hope you can find local guys that knows our engines really well. Having a tuned car does not mean its the end of all tuning.. sometimes cars might run a little weird after a few thousand miles of driving and needs a slight adjustment.

All my friend's cars are tuned and even the best tuners in Socal sometimes couldn't get the tune right after one session. I also hope this comes with a user friendly program to reset the tune back to stock if need be.

I have a Cobb Accesspro on my other car and I can set my tunes on the go so with this, I'm hoping its the same experience.

Originally Posted by amgone75

taku san does not use a conditioner for his aftermarket headers. part of the sard tuner is to adjust where needed so there are no check engine lights and it runs smoothly.so if u have ppe headers or sikky,tuned it with the sard tuner, the conditioner would be removed . taku also raised the rpm limit to 7115.