I’ve been lurking around for a few weeks planning my upgrade list as I search the Internet for the right LS430 to buy. Pretty much everything I read says you’ve gotta go stand alone ECU or piggy back but it isn’t very beneficial. Neither are something I’d want to mess with.

Turns out there’s a guy in Moscow named George that can tune the 3UZ in the LS430 on the OEM ECU. It starts on page 2, one guy has received one and is raving about it. Hope he can get it on the dyno to verify some gains.

Maybe this is old news but it’s new to me!

https://www.lextreme.com/forums/inde...e-flash.17541/

 

I have it as well, going to the track next week t see if it improved the times. I've already observed a full second improvement 0-60 for my car that puts it below factory new spec. Compensates for 215k miles of wear and then some nicely

 

How long have you had it? Please come back and let me know what the results are.

 

A few weeks now, much better in all ways than stock

 

I don't need this, but want it.

 

I just ordered the ECU from their partner in the US, quantum-auto. Waiting to receive it and will report back. Should be interesting to run this on dyno too

 

Subscribed.

 

Thank you for letting us know about remapping service available here in US. Looks like $175 dollars is the decent price for such an upgrade. Will be sending them the ECU in couple of weeks and will submit my feedback.

 

I received my new ECU yesterday and installed it this morning. Note that key reprogramming is required, and you need the master key (not valet) to do this. Below are some instructions I found from another thread (source)



Instead of the SST, you can simply use a paperclip or wire to connect the two pins. Overall, it's fairly straightforward and you should see all the lights flashing. Another note about installation, be careful removing the 4 screws holding the original ECU, it's very easy to strip the heads on these.

I'm fairly impressed driving with the new ECU. I mostly drive in ECT PWR, and that's when you can notice the most difference. The throttle response is almost instantaneous, it reminds me of Sport mode in newer Lexus vehicles. Gears are definitely held for longer. I opted to have my rev limit increased to 7500, but did not test this out yet. Something odd I noticed was when driving in manual mode, it does not downshift into second gear (nothing happens). I'm not sure if that is normal. After I installed the new ECU, the CEL turned on and I had a DTC for P1765. I had no DTCs prior to installing the new ECU, but maybe this is a coincidence. Everything seems to shift fine except for second gear. I will likely try my original ECU and see if I have the same DTC.

Turnaround time and communication for quantum-auto was fairly good as well. I ordered a new ECU instead of sending mine in, and it took 9 days from order placed to delivered. If I can get that DTC resolved, I can probably take this to the dyno and test it.

 

I am going to pick up a spare ECU from the junkyard and send it to Russia. What have i got to lose?

 

Probably your job, home and a few *********, be careful.

 

Update: Received a replacement ECU from quantum-auto. This fixed all the issues I was having. Everything works well with no DTCs or check engine light, and shifting into second gear works as expected. Good customer support from quantum-auto. Driving with the replacement ECU does seem much smoother than before, even in ECT PWR, overall happy with this ECU. Planning to get this on the dyno soon

 

Did you do a baseline dyno before, and if so, can you post the chart?

Thanks

 

I haven't gotten a baseline dyno done. I'm mostly waiting for a shop to have dyno day so I can have it done with the new ECU. I did find this dyno graph online, but not sure how accurate it is (I also have a 2001 with the 5 speed auto): http://www.dragtimes.com/Lexus-LS430-Timeslip-9179.html

 

I ordered an ECU from Quantum-Auto a couple of weeks ago and it is supposed to arrive tomorrow. Not sure exactly when I will put it in just yet.