IS-F / Sport Steering ECU
01-20-12, 10:31 PM
#31
There are a number of ECUs in the car. The steering ECU is a separate unit from the ECM (Engine Control Module) so it will not affect shifting in any way.
Sure, they could do everything with a single powerful computer, but it would introduce single point failure scenarios Lexus does not want to consider.
So looking at the entire scope here, there appear to be many changes for this ECU. I've been told the steering on the '11 F is better - now I'd like to know if the ECU is plug and play, or did they change more stuff to make it not possible? The wife complains about how heavy the F's steering is compared to our 350. It would be nice to be able to just swap boxes and make her happy. Too bad I'd need a Techstream enabled computer to swap these out and test.
Original IS-F
89650-53040
MY 11 IS-F
89650-53041
Original ISx50
89650-53020
MY 09 ISx50
89650-53060
89650‑53061 (supercedes 89650-53060)
MY 10 ISx50
89650-53080
89650-53081
Sport ISx50
89650‑53082
Sure, they could do everything with a single powerful computer, but it would introduce single point failure scenarios Lexus does not want to consider.
So looking at the entire scope here, there appear to be many changes for this ECU. I've been told the steering on the '11 F is better - now I'd like to know if the ECU is plug and play, or did they change more stuff to make it not possible? The wife complains about how heavy the F's steering is compared to our 350. It would be nice to be able to just swap boxes and make her happy. Too bad I'd need a Techstream enabled computer to swap these out and test.
Original IS-F
89650-53040
MY 11 IS-F
89650-53041
Original ISx50
89650-53020
MY 09 ISx50
89650-53060
89650‑53061 (supercedes 89650-53060)
MY 10 ISx50
89650-53080
89650-53081
Sport ISx50
89650‑53082
(Also, your part number list for the 2010 ISx50 is a bit incorrect. 89650-53020 is for All 06-08 (with or without Sport), 89650-53080/81/82 are all for 09-12 Sport, 09-12 without Sport Package is 89650-53060/61).
Jeff
Last edited by Jeff Lange; 01-20-12 at 10:35 PM.
01-21-12, 10:46 AM
#32
Tech Info Resource
iTrader: (2)
Steering feel isn't noticeably different between sport and regular mode. The only really noticeable difference is throttle sensitivity. It is vastly better in sport mode.
I don't have direct access to EPO, so using the internet retailers was the only way to get part numbers, and even that's not very reliable some times. You can't beat EPO for figuring out what goes with what quickly.
I don't have direct access to EPO, so using the internet retailers was the only way to get part numbers, and even that's not very reliable some times. You can't beat EPO for figuring out what goes with what quickly.
01-21-12, 11:16 AM
#33
Yeah I was never 100% sure because despite the manuals stating that there is a difference in steering assist, they only give a vague graph with no actual units on the axis'. I may have to try an IS F ECU at some point, I'd like a stiffer steering feel, but I will have no control of which mode it will be in, or if it will dislike the fact that it will not be receiving any information from the ECU regarding which mode to be in (Normal or Sport).
As for the difference between 08-10 and 2011, I think I only ever drove an 08 IS F, and it was years ago now, so I can't offer any insight onto what the difference between the 53040 and 53041 ECU's might be. I'd love to know though.
Jeff
As for the difference between 08-10 and 2011, I think I only ever drove an 08 IS F, and it was years ago now, so I can't offer any insight onto what the difference between the 53040 and 53041 ECU's might be. I'd love to know though.
Jeff
01-21-12, 12:32 PM
#34
Pole Position
01-21-12, 04:02 PM
#38
Pole Position
There are a number of ECUs in the car. The steering ECU is a separate unit from the ECM (Engine Control Module) so it will not affect shifting in any way.
Sure, they could do everything with a single powerful computer, but it would introduce single point failure scenarios Lexus does not want to consider.
So looking at the entire scope here, there appear to be many changes for this ECU. I've been told the steering on the '11 F is better - now I'd like to know if the ECU is plug and play, or did they change more stuff to make it not possible? The wife complains about how heavy the F's steering is compared to our 350. It would be nice to be able to just swap boxes and make her happy. Too bad I'd need a Techstream enabled computer to swap these out and test.
Original IS-F
89650-53040
MY 11 IS-F
89650-53041
Original ISx50
89650-53020
MY 09 ISx50
89650-53060
89650‑53061 (supercedes 89650-53060)
MY 10 ISx50
89650-53080
89650-53081
Sport ISx50
89650‑53082
Sure, they could do everything with a single powerful computer, but it would introduce single point failure scenarios Lexus does not want to consider.
So looking at the entire scope here, there appear to be many changes for this ECU. I've been told the steering on the '11 F is better - now I'd like to know if the ECU is plug and play, or did they change more stuff to make it not possible? The wife complains about how heavy the F's steering is compared to our 350. It would be nice to be able to just swap boxes and make her happy. Too bad I'd need a Techstream enabled computer to swap these out and test.
Original IS-F
89650-53040
MY 11 IS-F
89650-53041
Original ISx50
89650-53020
MY 09 ISx50
89650-53060
89650‑53061 (supercedes 89650-53060)
MY 10 ISx50
89650-53080
89650-53081
Sport ISx50
89650‑53082
01-22-12, 06:38 AM
#39
Tech Info Resource
iTrader: (2)
01-25-12, 01:56 PM
#40
Well, after reaching a deal with Alantjai, I ordered the IS F ECU, and it arrived today. I was surprised to find that the bracket on the ECU is different, though not that surprised, considering the battery is different, so it looks like I'll have to transfer the ISx50 brackets over to the IS F ECU.
ISx50 ECU:
IS F ECU:
Jeff
ISx50 ECU:
IS F ECU:
Jeff
01-25-12, 09:45 PM
#42
No it's not a problem, I swapped over the bracket from the ISx50 ECU to the IS F ECU and installed it, then calibrated it and went for a drive. It's nice, I like it. I mean it's not that much less assist than the Sport ECU I already had, but it is nicer.
Going from an 06 to what I have now would probably be a pretty big jump, but from what I had to the IS F one wasn't a huge difference, but it is definitely noticeable.
I like it.
PS: PM me your address, I'll ship out my 89650-53082 ECU tomorrow.
Jeff
Going from an 06 to what I have now would probably be a pretty big jump, but from what I had to the IS F one wasn't a huge difference, but it is definitely noticeable.
I like it.
PS: PM me your address, I'll ship out my 89650-53082 ECU tomorrow.
Jeff
Last edited by Jeff Lange; 01-26-12 at 08:55 AM.
01-26-12, 01:17 PM
#44
Tech Info Resource
iTrader: (2)
So now I'm burning to know if the revised IS F ECU will plug and play with the original. Some on the F side of the house say the steering on the '11 models is much improved.
