What does the ECT/PWR button do?
 

So what exactly does this button next to the shifter and all do? The pedals feel lighter whenever I activate it, MAYBE a tad quicker too? Does it advance timing? Info please?

I believe it holds shifts longer ie. revs to a higher rpm before shifting.

It's kinda like a computer that "knows" when you're stomping on the pedal to go faster. It allows for a longer shift when it "knows" this. Otherwise when you're driving normal with ECT on it has a normal shift.

"norm" is considered a type of "gas conservation" mode while "pwr" simply makes the shifting pattern more agressive. It doesn't give any extra horsies however.

ECT = electronically controlled transmission :thumbup:

On this topic, I've been wondering if there is any downside to just leaving it on "PWR". I sure like the more aggressive shifting pattern. Is it simply a trade-off between gallons per mile and grins per mile? I'd hate to think I was accelerating damage or wear-and-tear...

Follow up questions:
- is it okay to switch modes "on the fly"?
- is it okay to run PWR on the highway at 80mph? (I still get overdrive, right?)

Correction: Electronically Controlled Throttle
At least that's what I've been told.

You'll get overdrive as long as you have O/D on.
Don't know if it's safe to do it on the fly. I wouldn't suggest it, it's trying to change the rate at which it switches gears so if you're changing it mid gear shift than you could really mess things up. Flip it when it's stopped.

Two different things.... the ECT Tranny button is Transmission like Mike said

The thing you're thinking about is Electronic Throttle Control System with intelligence (ETCS-i), which links the accelerator pedal directly to the engine computer and responds accordingly. Basically drive by wire on newer Lexus models (IS, 01+ GS, etc)

More proof? Here's a link from Lexus with the definition http://www.lexus.com/models/glossary.html?entry=ecti

Shifting ECT on/off on the fly is just fine, I've done it since 1983 on all sorts of Lexus / Toyota with no problems.

I often leave my cars in Power for a more fun driving experience, but it does have a cost. 1) Gas as you mention and 2) the higher revs can put a bit more wear and tear on your car. Not something I personally worry about - worth the tradeoff for the extra umpf

IS it safe to assume that the ECTS-i came with VVT-i motors then?

Yes, because VVT-i was introduced in '98 on the 1UZ's.

See when the light hit the ice it twankle and glisen

I switch modes (norm to pwr) on the fly typically when getting on the freeway. And I switch from "norm" to "pwr" when my car is stopped only when I feel the need to launch faster/harder. :thumbup:

My OD is ALWAYS on. I like it that way. And as far as the pwr button on the highway at 80mph, yes, I actually recommend it. If I'm traveling over 45mph for any extended period of time I always have my tranny in PWR mode.

Lol, thanks Big Dave :D :thumbup:

Power button also allows the tranny to shift quicker and harder, which saves some wear on the tranny.also stops the engine from retarding the ignition while its shifting.

I wanna hear the explanation with the little transmission men under the hood again....:D