My guess is that some people have a heavier foot than others.

I used to say that I never noticed the jerkiness on mine, but now I did when I press more on the pedal on starts. But now when I am a bit more on the hurry, I switch to Sport mode instead of Echo, and it does it for me.

If I am more conservative, I notice nothing in Eco mode. And it is fine with me.

But when I read about the power tune getting more millage, that makes me interested.

 

 

Exactly PeeVee, I notice the same thing, drive around my country town where life is slow and the changes are fine as I only drive gently, go to Sydney (Aust) where it's very fast paced and trying to keep up with the traffic means poor downchanges as the car has changed up gear to soon. Like you say put it in Sport and it's good again. I've learnt now how to drive it and what mode is best for the conditions and very happy with it like that as the rest of the car is great in my eyes.

Did you see this link from above, read it and I think you'll be less interested in that module.
http://www.performancechipreviews.co...formance-chip/
http://www.performancechipreviews.co...formance-chip/

 

Thanks! It says it all!

 

I'd be reluctant to attach anything that's connected to a cars electrical system in 2018 when so much computer control is now used. Especially an expensive car with all the gizmos this RX has.

I've read all your posts and happy for you that it works. I feel the RX drives the way it was designed, it's a Lexus, a refined vehicle for comfortable cruising on the freeway or a sedate drive into the city for a business meeting. Drive it gently in Normal mode and it's fine, don't expect too much get up and go, it does weigh 4400 odd pounds, she's overweight. If you want more performance that's what Sports/Sports+ is for, use those modes and spirited driving is great, changes happen as expected. I think this has a lot to do with the way the Japanese see driving compared to the US/Canada/Australia. Yes I know other cars aren't this fussy, maybe the Japanese have got the software wrong slightly but also remember that numerous other 8 speed cars have issues too apparently from what I've read on here.

I bought my RX used, 18,000 km on it, an ex-Lexus head office vehicle - it seemed to drive fine around the unfamiliar dealership area but when I took delivery and drove the 1.5 hours home the hesitation started to show. Once in my familiar area it was obvious it had issues, so started trying different octane fuel, driving differently to allow for the unusual gear changes, trying other fuel again, switching to Sport, then Eco, then Normal and for a while it would seem okay but then back to awful. At the 30,000 km service I mentioned the issue, they found nothing wrong but did reset the ECM and wow, a different car, it was obviously better and once back to familiar territory it felt great - mostly. That's when I realised the car has two personas, drive gently and it's fine in Normal mode, want to go faster put it in Sport. The moral of my story is I feel this learning transmission is trying to be too smart - I bought the car used so it was use to another person driving, I started driving it, felt unhappy with it and kept changing fuels and driving techniques which basically kept changing that learning pattern and screwing up the whole process, at the service the ECM was reset and back to standard and has been great since (if I use the appropriate mode for the conditions). Anyway that's my story - maybe the US models have a more fuel efficient mapping as I know economy is a big thing over there, this would mean sooner up-changes then ideal but better headline fuel consumption, and this may mean even more poor driving characteristics compared to ours.

 

It may be just a placebo effect...

 

I'm the only driver. When I'm alone, I like to put it in Sport and drive a bit more aggressively. If my wife is with me, I leave it in Normal and drive, well, normally.
While I like the response in Sport, I don't have any issues in Normal mode.

 

I hate eco mode!! Have no problems in normal & sport, but eco seems to dull the sensors of the throttle and the consequence is jerks and lags. Better stay off it, it's there mainly to appease the MPG fans and NOT those who enjoy driving.

 

Placebo is indeed a powerful effect!

 

 

 

Good morning! I read your post above and I'll alf for trying this and happy there is finally a fix. My delimma...I have no idea what to do about installing this plugin ie, where do I install it or do I need a mechanic to do it or do I bring it to Lexus? Any help would be greatly appreciated! Thanks

 

Watch this video to locate the port. There are install instructions in the box and should take no more than 3 minutes to complete the install.

 

folks are kidding right? a $70 chip will all of a sudden make a 60k car better....not. read the clip above again.>. are these the same people who put those silly turbine air cyclones in their air intake because it said theyd get improved mpg.....sheesh. unless someone can provide a statistical twst on a dyno machine or other objective measurement, lets move on from this silly scam.....ps...theres an investment with 20% return if you want to put your money in border walls...go for it!

 

No correlation between cost of fix and cost of vehicle. Could argue the car is $60k as that's what the market willing to pay, not what it's parts are 'worth'. Would probably be a shock to see how cheap these cars actually cost them. I had previous car with an aftermarket 'retune' of the transmission (was free), albeit a sports car, and it made a huge difference. Not saying this unit for sale will make a difference, but, for those with issue, may be worth try. I have no skin in the selling of them of otherwise, just past experience with a tune from the port that made one. Lexus sells so many RX's, it would be hard for them to care very much in tweaking perfection.