RCF swap in ISF complete!
01-03-22 | 04:22 PM
#1
Thread Starter
Instructor
Joined: Mar 2018
Posts: 992
Likes: 348
From: California
RCF swap in ISF complete!
Seems like someone already got it done. Seems badass. Idk who it is but wish he was on here to tell us all the work that went into it.
https://youtube/2W0y94md2o8
https://youtube/2W0y94md2o8
Last edited by ISFpowered; 01-21-22 at 05:02 PM.
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01-22-22, 10:13 AM
10th Gear
Joined: May 2012
Posts: 11
Likes: 61
From: FL
Hello everyone, this is my car. My buddy Adam told me about this post so i'm here to answer a few questions and speculations. Yes i was boosted previously, the car made around 542whp on 5psi on an engine that had 260k miles. With this many miles i knew it was gonna eventually go out so i bought a spare motor and had it sitting when the car was at 255k. I used my high mileage engine to test and tune and do runs in mexico, trying to force it to blow up so i could install my new engine. These engines are so well built that even with that high mileage it wouldnt blow no matter how i abused it. So my new motor sat for about 3 months and exhausted the warranty. My motor finally blew the suspected headgasket as it started smoking alot at 260k miles. So i installed my new engine that i had sitting but that new engine turned out to be a bad engine. I resold that new bad engine and my turbo kit after my loss and purchased the RCF engine with the money as i stumbled on a great deal in ATL.
Now with this new swap, everything was plug and play. I used the RCF engine harness as well and it plugged right into the ISF ecu. I also have the RCF ecu but i didn't want to use that because the new can-bus system would have been problematic for the older ISF. So i compared both ecu pinouts that i received from my buddy Jake and switch the pins from the RCF engine harness to where they are on the ISF engine harness. I also had to repin a few junction connectors that also plugged up. My only challenge was the starter signal since that came from the immobilizer and not the ECU. With the atkinson and otto cycle, that doesn't affect anything since it's mechanical and VVT driven. How the cyle works is the RCF uses Atkinson cycle for fuel efficiency at lower rpm and switches to Otto cycle for power output at WOT. since i'm using the ISF ECU the engine will always be in an Otto cycle like the ISF which i believe is better for low end torque. Otto means it's always ready to make power, who needs atkinson for fuel efficiency in a sports car, right? But everything works great and completely like stock, with no check engine light.
Let me know if you have any questions.
Mike.
Now with this new swap, everything was plug and play. I used the RCF engine harness as well and it plugged right into the ISF ecu. I also have the RCF ecu but i didn't want to use that because the new can-bus system would have been problematic for the older ISF. So i compared both ecu pinouts that i received from my buddy Jake and switch the pins from the RCF engine harness to where they are on the ISF engine harness. I also had to repin a few junction connectors that also plugged up. My only challenge was the starter signal since that came from the immobilizer and not the ECU. With the atkinson and otto cycle, that doesn't affect anything since it's mechanical and VVT driven. How the cyle works is the RCF uses Atkinson cycle for fuel efficiency at lower rpm and switches to Otto cycle for power output at WOT. since i'm using the ISF ECU the engine will always be in an Otto cycle like the ISF which i believe is better for low end torque. Otto means it's always ready to make power, who needs atkinson for fuel efficiency in a sports car, right? But everything works great and completely like stock, with no check engine light.
Let me know if you have any questions.
Mike.
01-03-22 | 10:39 PM
#3
He is in the "Community F" group on facebook, Michael Anglin
He said he re-pinned the RCF harness to the ISF ECU. There may be some questions about if the ISF ECU can take full advantage of the newer design. One big difference is the ISF is an otto cycle and the RCF is an atkinson.
He said he re-pinned the RCF harness to the ISF ECU. There may be some questions about if the ISF ECU can take full advantage of the newer design. One big difference is the ISF is an otto cycle and the RCF is an atkinson.
01-04-22 | 09:20 AM
#4
He is in the "Community F" group on facebook, Michael Anglin
He said he re-pinned the RCF harness to the ISF ECU. There may be some questions about if the ISF ECU can take full advantage of the newer design. One big difference is the ISF is an otto cycle and the RCF is an atkinson.
He said he re-pinned the RCF harness to the ISF ECU. There may be some questions about if the ISF ECU can take full advantage of the newer design. One big difference is the ISF is an otto cycle and the RCF is an atkinson.
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01-04-22 | 12:20 PM
#6
Lexus Fanatic
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Joined: Nov 2004
Posts: 13,441
Likes: 1,065
From: Under an IS F since 2008
Yes I struggled a bit with keeping the RC F wire harness and repining it to the existing IS F ecus..
Let alone differences like Atkinson Cycle and fuel lines as mentioned by Lobuxracer.
How will it make its intended BHP
Original Video link fixed..
Cool video on RC F motor from many years back..
Joe Z
Let alone differences like Atkinson Cycle and fuel lines as mentioned by Lobuxracer.
How will it make its intended BHP
Original Video link fixed..
Cool video on RC F motor from many years back..
Joe Z
01-04-22 | 05:20 PM
#7
Intermediate
Joined: Feb 2018
Posts: 292
Likes: 127
From: WI
Spend some time in just reviewing data between both ECMs and they are very different.
IIRC the ISF ECU is a 32bit processor and the blue top engines use a 86bit processor.
If I could run a next gen ECU I totally would, things like KCLV are now KAM, logging speed is perfect, more PIDs ,etc.
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JT2MA71 (01-05-22)
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01-05-22 | 10:27 AM
#9
Moderator
Joined: Apr 2017
Posts: 3,086
Likes: 972
From: Indiana
I really wish this were an easy swap. It’s a shame the engine is in the same family but we can’t easily do this.
01-05-22 | 05:39 PM
#10
Lexus Fanatic
iTrader: (10)
Joined: Nov 2004
Posts: 13,441
Likes: 1,065
From: Under an IS F since 2008
No Boost or Tune is ever “reliable”
The original take out motor was sold last week for $2,000 - here’s the details on the listing
@Jwconeil“Selling a complete long block from a 2011 Lexus ISF, 2ur-gse 5.0L V8. The engine has 90k miles but has a tapping sound in the head. Can be repaired or used for parts. I also have the matching transmission with 90k miles for an additional $500 as a package deal. Perfect for someone looking for a swap for a shell if you have time to diagnose the loud tap, could be something simple. Pick up only in Southwest Florida.”
Joe Z
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lobuxracer (01-06-22)
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lobuxracer (01-06-22)
01-06-22 | 09:10 PM
#13
If they do, it's not documented anywhere in TIS. I've been quite literally all through the New Car Features and there's nothing there about it. It's definitely in the RC F NCF.
01-06-22 | 10:39 PM
#14
from A closer look at the Lexus IS F V8 engine - Lexus UK Magazine
"From its introduction in 2008, the venerable 2UR-GSE has gone on to power the Lexus RC F and GS F models, as well as the flagship LC 500 coupe. During that decade it has been subject to further refinements that have resulted in a headline output of 471bhp at 7,100rpm and the ability to switch between Otto and Atkinson combustion cycles to optimise efficiency at cruising speeds."
"From its introduction in 2008, the venerable 2UR-GSE has gone on to power the Lexus RC F and GS F models, as well as the flagship LC 500 coupe. During that decade it has been subject to further refinements that have resulted in a headline output of 471bhp at 7,100rpm and the ability to switch between Otto and Atkinson combustion cycles to optimise efficiency at cruising speeds."
01-07-22 | 10:26 AM
#15
Intermediate
Joined: Nov 2014
Posts: 284
Likes: 57
From: FL
The original take out motor was sold last week for $2,000 - here’s the details on the listing @Jwconeil
“Selling a complete long block from a 2011 Lexus ISF, 2ur-gse 5.0L V8. The engine has 90k miles but has a tapping sound in the head. Can be repaired or used for parts. I also have the matching transmission with 90k miles for an additional $500 as a package deal. Perfect for someone looking for a swap for a shell if you have time to diagnose the loud tap, could be something simple. Pick up only in Southwest Florida.”
Joe Z
@Jwconeil“Selling a complete long block from a 2011 Lexus ISF, 2ur-gse 5.0L V8. The engine has 90k miles but has a tapping sound in the head. Can be repaired or used for parts. I also have the matching transmission with 90k miles for an additional $500 as a package deal. Perfect for someone looking for a swap for a shell if you have time to diagnose the loud tap, could be something simple. Pick up only in Southwest Florida.”
Joe Z
Last edited by jdmek998; 01-24-22 at 08:35 AM.