This question is going to put my ignorance on full display, but is it possible to have these tunes based on drive modes? Like have it run stock in eco, normal, sport s, and custom, but have it run the tune only in sport s+?

 

I dont know about Lexus, but other cars have that capability.

 

I realize it's very early days but I'd love to hear some feedback on what the ECU and TCU tunes do specifically with drivability stuff like throttle lag and smoothing, throttle input curves, transmission coasting and downshift behavior and how these things change for the different drive modes. Great to hear that the trans tune helps with willingness to downshift. While an extra 15-30hp would be nice, the disconnected nature of the throttle on this car is my biggest annoyance and is the main reason I'm interested in this.

 

Only have about 20 minutes of driving time post ecu and tcu tune. Majority done in normal powertrain mode. Regular street/local road driving, with normal throttle input, the car will still shift through the gears for efficiency. However, they do appear to be a bit crisper and should you decide to step on it more to go from about 30 to 45-50mph, it will stay in gear longer instead of downshifting 1-2 gears. I always thought that downshift was a bit overkill. Most noticeable part of the ecu tune is the torque/power curves. It hits earlier and hits harder and just keeps going smoothly even if not WOT. Went onto the highway and it's so much easier to get up to whatever speed you desire. Planning to do a dyno eventually but for now it’ll just be more subjective observations on the behavior of the car.

 

Flashing ECM and TCM.

 

Butt dyno says very good results. The car pulls so much harder in 2nd gear. The torque curve feels a lot more linear rather than flat. Transmission feels like it’s shifting smoother, in the sense of there’s no disconnect of power during a shift. Much less noticeable at least. Loving it so far, and will continue to put it through its paces.

 

How does the trans behave at WOT? Mainly referring to how it shifts around 6700’ish rpm.

 

More of a "just want to know" kind of thing, but has anyone done a 0-60 time with the TCM and ECM tune?

 

all subjective but i felt like the car shifted better when WOT even pretune compared to when it’s not being pushed. However, post tune on WOT, shifts feel snappier and no discernible gap in power delivery in between shifts. Car feels always ready to go. I would describe it like using pennzoil motor oil vs thicker oem oil.

 

might do one tomorrow again. I tried before but either I didn’t put pedal to floor or my dragy isn’t working properly, got a super slow time of 6 seconds lol which idk how that’s even possible.

 

IMO the car shifts decisively in sport S+ mode but seems to leave some on the table since the shifts happen 500rpm below redline. Curious f the shifts are happening closer to 7200?

 

So the difference is possibly a placebo effect?

 

no, there are definitely noticeable differences but they’re just hard to capture and explain. What I’ve said aligns with others’ posts. I imagine the only way to really know everything that changes with the tcu tune is to ask Loi

 

haven’t tried it in s+ without manual mode yet but maybe someone else can comment

 

This car is not that fast, especially without a clean launch. A few others have gotten high 5 second 0-60 times too.

Supposedly if you just mash the gas pedal and the car hooks you should get the best time. I don't think you need to brake torque or anything.