hey everyone i have a gs4 and i was wondering how the PWR mode helped, does it help with taking off quicker or is it to be used when you are pulling a heavy load, i have tried to fiddle with it for a little bit, but i just cant decide how it would benifit, so does anyone have any take on it?

 

for me it makes my tranny easier to kick down and drop a gear, and also it lets me stay at a gear longer to reach higher RPM.

 

PWR mode (from a driver point of view)
* stay at low gear longer ==> not upshift til red light / or depend on your driving condition or engine load==>better acceleration

* shift down to lower gear quicker==>beter response when change lane....

did I miss anything?

PWR mode (from the car engine management view)
my guess...
* use more aggressive fuel map
*shifting points change

===> use up more gas, but it will give you alot better response.

Anh

 

I don't think it'll wait til red-line to shift...... it'll just won't shift unless you loosen up on the gas (well at least that's what my ECU is doing). If you just drive normal, it'll bring your car to higher RPMs each gear but it's not gonna wait til redline (unless you're already at high RPM).

PWR mode will also let your RPM climb faster.

 

My experience:

The ECT power button is effective when you work it right. You can't just stand on the gas pedal and expect it to do the rest. To get the best acceleration, you have to press the gas down into passing mode and as the RPMs reach it's peak (not neccesarily redlined) let off for a half a second then punch it back into passing mode. If you have it down right, it feels like you're driving a stick. You have to work at it to get it down, took me a while to learn the behaviors of my tranny. But I beat an S2000 the other day from 40-90mph using ECT PWR (could have been a ****ty driver).

 

I always hit the PWR button when someone wants to race me. Afterwards I switch it back cause it uses more gas in that position.

 

Hmmmm. I just leave my on all the time. Is that bad?

 

Me too, and no.

 

Not bad at all, just consumes a lot of gas---especially true the harder you accelerate.

 

it speeds and firms up the shifts as well

 

yeah it feels a lot better to accelerate and change lanes with it on. but here is my question. when i'm going like 40 and push the power button and push the gas a little more it doesn't seem much different. the power buttons seems to work better when you activate it under 20MPH. onces its over 40 and you activate it it doesn't feel as crisp. anyone else experience this

 

After you hit the PWR button, let off the gas, then ease it into passing mode. If BananaGS is correct and the ECU remaps the fuel injection, you may need to let off the gas pedal for the effect to set immediately.

 

here is my take
I am pretty sure any performance car maker would use more aggressive fuel curve. You can't make more power w/o extra gas??? that wouldn't make any sense, you really don;t want to run heavy engine load w/o gas ==>ask any turbo/supercharge guy, they will tell you what happen if you do that.

I once talked to a Nissan master tech from nissan corp, he told me that no matter what you do, hack/trick the ECU is the only way to "really" gain power. I am sure Lexus know this, if they want PWR mode to work, they just change the fuel parameter a little bit, heck that probably how Mo SRT and Apexi works also, just that they are not adjusting it from within the ECU (just tricking the ECU), and changing the Vtti timing also if possible(for lexus). should be easy the easiest thing to do for the manufacture.