Aspect

Hmm that's weird, first I've heard I've heard of someone have problems getting it calibrated. Did you tell them you installed a diff steering ecu? I just brought mine in with the isf steering ecu and said I'd like a steering calibration. Maybe it's just their way of saying they won't do it(excuses) because it's not standard equipment on the car for liability purposes idk

Zmon

iTrader: (2)

Could be a dead unit, it happens. There is no programming to load as it's already on the ECU itself, they're simply calibrating it (iirc, the torque sensor and rotation angle sensors).

I bought mine off a 12 IS-F so I didn't need to calibrate it since it worked upon installation, but I did it anyways. Had a Toyota dealer do it and they had no problem with it (although I needed to explain exactly what I wanted since the service advisor initially told me no until an ex-tech turned service advisor said they could do it no problem).

2013FSport

iTrader: (2)

At this point one has to question what killed the original ECU and/or was it misdiagnosed in the first place? Did it have codes present when it failed? And what was the failure mode? No assist? Maybe put that ecu back and scan for codes?

--

As for F-sport / non F-Sport ecu, the F-Sport is pretty nice until you really push the car and the nannies kick in aggressively. If it weren't for that I would call it a nice fit for this chassis.
You can literally drive it at any speed, point it and go with complete confidence. All of the words spoken about the non-F, makes me think they really hosed up as all of them should have had at least the F-sport feel if not IS-F feel from 2006 up. At 1XX mph and up, mile after mile it is a nice driving predictable car. GF just wants to faster. lol

SlenderKen

Hello all. I like this thread and have a basic question regarding the steering ECU.

I currently run the RR-Racing tune in my car. If I purchase another steering ECU, will that require me to apply the tune to that as well?

I guess my question is, is the steering ECU the same as the the ECU that I tuned?

redspencer

iTrader: (1)

The ECUs are entirely separate. 👌

davidbusta

iTrader: (1)

i want to order one of the ISF ecu today. i just cant decide on which one exactly. the -41 or -42 for my 2006 is350. is the -42 worth the extra money? i know no matter which one i order, putting an ISF ecu in my 06 is350 will make a dramatic improvement. but i want the best one so obviously the -42 would be my answer but from what im understanding they are both really similar with just some small changes so i just dont know if its worth the extra money.

redspencer

iTrader: (1)

It's tough to say. As you noted, the differences in steering feel between the -41 and -42 units (from those that experienced both units) are supposedly fairly minute and subtle (compared to the updates made from the -40 to -41 unit). I don't believe Lexus published any information to clearly define the changes with the -42 unit.

If the current price delta between the -41 and -42 is ~$100, I would certainly go with the latest and greatest. If the price difference is still approx. $150-$200, it would be a tougher sell as the -41 unit is a significant improvement over the ISX50 Steering ECU.

davidbusta

iTrader: (1)

the price difference that i finding right now is $177. which is why im actually considering the -42. if it was a $200+ difference i wouldn't even consider it at all. its my daily driver and i dont think ill ever track my car like how you do. but i do have some fun on the streets in the middle of the night(in mexico) or through the canyons. but that being said i think itll just be wiser if i get the -41 and save the few extra bucks for another mod. Because if its been years since people started doing this mod and we still cant figure out exactly what was improved, that must mean that its not much of a difference.

flowrider

iTrader: (9)

^^^^Whatever you do, don't forget the ISF weight for the steering wheel

Lou

davidbusta

iTrader: (1)

haha I got that being delivered tomorrow.

davidbusta

iTrader: (1)

I had the -41 ECU installed yesterday on my 2006 IS350 and I feel like the steering feeling got very slightly heavier but not anywhere close to what I was expecting before installing it even when I push the power button underneath the steering wheel. I feel like if I let someone drive my car before and after the change without telling them what the changes was that they would of not noticed the difference in the steering feel. When I was driving home from the Lexus dealership after they calibrated it, I was honestly thinking if maybe they switched out the -41 ECU that I installed right outside the dealership to a stock 2006 ECU. The difference was that small to me. One thing that I did notice however is that I am able to toss the rear a bit more than I used to be able before the traction kicks in and cuts my power. Which I love because I have can a little bit of fun going around a corner without much risk of losing complete control like if I would of had traction control off or not be able to have fun at all with traction on. Now I can toss it around the corner while still having traction on and then let traction control kick in to help me straighten my car out.

MikeFig82

iTrader: (13)

Before I pulled the trigger on my -40 08-10 ISF. I read that it was the most heaviest feel ecu. That's why I went with it coming from a GS400 even with the sport steering ecu I got for it. It was still the most sloppy feel ever.

I didn't want my IS to be like that. In all give it a few days the ecu should firm up a bit. By how much it will increase firmness is anybody's guess.

Jeff Lange

iTrader: (1)

What tires are you running?

Jeff

davidbusta

iTrader: (1)

Michelin pilot super sport. Factory sizes. 225/40/18 front. 255/40/18 rear

Zynthe

iTrader: (5)

Do you mind sharing where you were able to procure the -41 ECU?