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Lexus IS250 to IS350 M/T conversion

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Old 07-03-14, 11:25 AM   #16
Sffd103
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Have you thought about adding an F Sport short shifter? I added that to my manual transmission and it made the throw so much less. Consider that.
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Old 07-03-14, 12:10 PM   #17
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Awesome! More push for me to start mine
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Old 07-03-14, 03:40 PM   #18
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F sport SS will be installed next week. Looking forward to it =D
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Old 07-03-14, 04:37 PM   #19
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Major props for doing the engine swap! Now, can you go into greater details for us here on what exactly was swapped in your car and if you are getting any CELs or warnings or anything?

Thanks!!!
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Old 07-05-14, 07:04 AM   #20
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iv done the swap
and theres no CEL no codes
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Old 07-05-14, 07:39 AM   #21
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This is awesome. I can only imagine what a manual trans 350 would feel like to drive. Good work!
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Old 07-05-14, 01:43 PM   #22
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Wow amazing work! you should do a full write up on this!
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Old 07-05-14, 03:01 PM   #23
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Quote:
Originally Posted by ilv1004s View Post
iv done the swap
and theres no CEL no codes
^I thought you did the actual 6spd gearbox into an auto is350? Wasn't there a lot of pins to rewire to get rid of all the Codes from the ECM?
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Old 07-05-14, 08:01 PM   #24
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Quote:
Originally Posted by mikellucci View Post
^I thought you did the actual 6spd gearbox into an auto is350? Wasn't there a lot of pins to rewire to get rid of all the Codes from the ECM?
yeap
this is my brothers car
its a manual IS250
then we put a 2011 IS350 runing gear into it
took out the autobox and bolted up the MT box
no rewire or anything needed
other than the wiring for the gearbox and reverse sensor input
and the ECU has to be reflashed to delete the autobox off the ecu programing
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Old 07-06-14, 08:55 AM   #25
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Congrats, an exeptional mod.
I have a 250 M/T supercharged running beautifully for 30.000 miles now.
Fidanza flywheel along with the Spec 2 clutch go along like a glove.
Install a quick shift and it will change the stick's distance to half.
Congrats again.
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Old 07-06-14, 09:16 PM   #26
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Nice a supercharger. I was thinking of supercharging the 3.5L but not sure if the box can handle that much power. The car loses enough traction already at the moment...
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Old 07-07-14, 07:08 AM   #27
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Quote:
Originally Posted by ilv1004s View Post
yeap
this is my brothers car
its a manual IS250
then we put a 2011 IS350 runing gear into it
took out the autobox and bolted up the MT box
no rewire or anything needed
other than the wiring for the gearbox and reverse sensor input
and the ECU has to be reflashed to delete the autobox off the ecu programing
So I am confused here and need some clarification. So you are saying that the IS350 engine is a direct swap to the IS250 with no/minimal rewiring. What I'm reading is that you had a M/T IS250 took out the 4gr engine, installed the 2gr engine from the 350 with A/Tand it was a direct swap other than the gear box wiring. Did you document any of the work done? Sorry to be a skeptic but something is a little off

Where did you reflash the ECU? I thought the toyota N/A ECU's couldn't be reflashed

IF it is true, this opens up alot of options for modding an IS250 since the 250 is the only one that can accept an LSD from earlier models.

Last edited by NYKnick101; 07-07-14 at 07:13 AM.
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Old 07-07-14, 07:22 AM   #28
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Wait; so is it really that easy?

What other parts are needed? I am guessing, every single component from the engine bay, radiator etc. Are the 350 engine mounts at the same location any drilling reinforcement needed?
Any parts relocation needed to fit it with the 6-speed transmission?
I am sure that the 250 differential will be ok for a while with the extra HP so I wouldn’t worry about that.
Anything else?
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Old 07-07-14, 05:20 PM   #29
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this is a basic run down

we used everything out of a 2011 is350 wreck which i bought for a dirt cheap price at the auctions
the whole is350 wiring was used everything down to the nav and audio etc

so even though the car is a 2006 IS250
the way we went about it
reshelld the 2011 IS350 into the 2006 IS250
and then took the MT box off the 250 motor
and bolted it up to the 350 motor
yes the ecus can be reflashed but we are not in the USA
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Old 07-08-14, 06:32 AM   #30
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I've always thoguht the M/T in the 250 could not handle the 350 power....at least that's what I have been told.

Awesome swap though!
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