IS350 motor into IS250. - Lexus IS Forum
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post #1 of 80 (permalink) Old 07-27-2008, 06:38 AM Thread Starter
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IS350 motor into IS250.

Hey guys,

Im not up with the new IS250-350 and I have a customer tossing up the idea of fitting the 350 motor into his 250.

The info I was after is are the box patterns the same and are the 250 ECU's like the IS200/300 and run the motor and body?

Would I need to run both the 250 ecu and 350 or could I swap it for the 350 and run the car functions of that, as all air bags and dash function would be the same I am assuming?

Any other things you can think of and any input is appreciated.
Thanks
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post #2 of 80 (permalink) Old 07-27-2008, 09:09 AM
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Originally Posted by IS1000 View Post
Hey guys,

Im not up with the new IS250-350 and I have a customer tossing up the idea of fitting the 350 motor into his 250.

The info I was after is are the box patterns the same and are the 250 ECU's like the IS200/300 and run the motor and body?

Would I need to run both the 250 ecu and 350 or could I swap it for the 350 and run the car functions of that, as all air bags and dash function would be the same I am assuming?

Any other things you can think of and any input is appreciated.
Thanks
Tell him to trade the 250 in for a 350. It'll be a -lot- cheaper and easier.

Apart from the fact the motor (assuming he's buying a new one) costs more than the trade-in difference you have the following problems-

They don't use the same transmission

The 250 transmission isn't rated to hold the power of the 350 engine.

They don't use the same ECU

You can't reprogram the ECU at all.

The 350 ECU will run the 350 engine, but not the transmission. It will be expecting a 350 transmission.

You could transplant both the engine -and- transmission and be a lot more likely to get the 350 ECU to work... but then have the problem of the 350 having VDIM and the 250 doesn't... so there'll still be sensors and wiring it's expecting to be there that isn't.

For a 2009 this'll be a little easier as both models will have VDIM, so you might could swap a completely powertrain and ECU from a 350 into a 250 then... still at a much higher cost than just trading the 250 in for a 350.

(the 250/350 have very complex electronics BTW, the body has its own ECU, steering has its own ECU, etc... among other things, you'd have to check if those ECUs are also the same part between models but I'd imagine they are as the optioning in those areas is similar between the models )
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post #3 of 80 (permalink) Old 07-27-2008, 09:57 AM
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Also dont forget about the direct injector on the 250, and the direct AND port injector on the 350. You would need the fuel injector harnesses as well.

I agree, tell him to trade it in. If he does swap, he will pay loads of money in parts and labor trying to get it to work, as well as loosing his factory warranty. If he trades, He will be in a vehicle that is made for the power, as well as a factory warranty on a car thats not all hacked up.

Definitely more trouble and money than its work in my opinion. I cant imagine how much those engines are going for.

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post #4 of 80 (permalink) Old 07-27-2008, 08:08 PM
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exactly, hes better off swapping the 250 engine for a twin turbo supra engine, same trouble but much faster lol.

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post #5 of 80 (permalink) Old 07-27-2008, 10:17 PM
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If he's considering a 350 engine, he's better off trading in his car for a 350 instead. Doing a swap and not considering anything else, doesn't seem like a realistic idea, since he still needs to think about other things such as the tranny most importantly. Knightshade pretty much nailed all the points.
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post #6 of 80 (permalink) Old 07-28-2008, 04:38 AM Thread Starter
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Thanks Knightshade,

Rep to all.
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post #7 of 80 (permalink) Old 07-28-2008, 11:11 PM
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( . Y . )

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post #8 of 80 (permalink) Old 07-29-2008, 07:06 AM
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eventhough it's a manual???
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post #9 of 80 (permalink) Old 07-29-2008, 08:46 AM
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eventhough it's a manual???
The 350 doesn't come with a manual at all, so if anything that'd be even worse for trying to make the ECUs work properly, let alone physically connecting them.
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post #10 of 80 (permalink) Old 07-29-2008, 09:33 AM
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right..
probably go for a turbo conversion lol
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post #11 of 80 (permalink) Old 07-30-2008, 09:51 AM
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Just get the complete swap with wiring harness and ecu. If no ecu, then just run a standalone. You'll be set.
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post #12 of 80 (permalink) Old 07-30-2008, 10:32 AM
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Originally Posted by {JDM} James View Post
Just get the complete swap with wiring harness and ecu. If no ecu, then just run a standalone. You'll be set.
Except no standalones exist that can run the IS350 and all its attendent ecus and systems.

And a complete swap will be useless since you'll still have the problem of the transmission...unless you get a 350 transmission too... at which point you're paying like 3-4 times more than just trading the car in for a 350...and you'll still have the VDIM problem.
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post #13 of 80 (permalink) Old 07-30-2008, 11:24 AM
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I agree w/ the just get a 350 comments

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post #14 of 80 (permalink) Old 07-30-2008, 01:46 PM
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Probably easier to have a machinist bore out the is250 engine. From what i can tell it's the same engine with a liter missing and only direct injection.

07 IS250 RWD - K&N Cold Air Intake - Mazzuri Super Headers - Joe Z Full Exhaust (no cats) -Hotchkis Sway Bars - Konig rims
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post #15 of 80 (permalink) Old 07-30-2008, 09:48 PM
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+1 for just trading in the car and getting an IS350.

.
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I really wanna be a racecar driver... :-/

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