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Whoa, what is everyone so scared about? This kind of attitude is what keeps us with no modifications for our car or improvements if you don't let anyone explore. To the comment that it would be even more difficult to mate the 350 to the 250's manual then it's automatic? I completely disagree? Why would it be more difficult for the computer to work with a transmission that requires no computer to work (manual operation) then with an auto it isn't designed for? Here's another question for you guys. Do you really think that in the factory lexus has a different body for the 250, 350, is-f, or that they are determined during production as to what they will be fitted with? This platform is very interchangeable and as I research I learn this more and more. It seems car companies are getting smarter with interchangeable parts to lower costs which in turn gives us more options. Here would be a good start, IS350 complete engine out of a wreck (motor, harness, fuel injection system, computer, everything). Transplanting that, and assuming it bolts up to the IS250 manual transmission (which it should considering it has the same bell housing). You should be able to get engine to run even if it thinks the transmission is missing. From that point you would have the joy of getting someone to crack the computer and disable the various features your car won't have. Have fun, if you don't try it, someone else will; shoot i'd love to the first to swap it. Watch out IS-F for the 350 manuals!
For one, the ECU can't be cracked.

They haven't even cracked most of the functions on the Supra ECU and that car is over 15 years old at this point...and the ECU on the IS is -way- more complex.

Many of the functions of the ECU are physically burned onto the PROMS so you'd need an electron microscope to even read the programming to begin with, before you even thought about how to change it. Then you'll need to crack the encryption that nobody has touched in all the years toyota has been doing it. Then you'll need to not tell anyone to avoid the DMCA lawsuit from Toyota.

So the engine will NOT run properly, probably not even at all, when it noticed half the powertrain it's expecting to help control doesn't exist.

For another, the cost to do the swap will be considerably more than just swapping the car for one that COMES WITH THE ENGINE TO BEGIN WITH.

And for a third, if the manual was capable of holding the power, and was simple to swap, then Lexus would be offering it as an option in the first place.

The fact they don't strongly suggests you'll kill the transmission even in the unlikely event you got the engine to even run without a transmission it's looking for.

And then there's still the fact the ECU would also be looking for the missing VDIM components too.

Seriously, the reason everyone is against it is it's a really dumb idea that simply won't work.

Oh, and the IS-F -does- have a different body. That's why the fenders and other parts don't interchange. The IS-F engine is larger so they had to make room for it.


Oh, and last I knew, the engine alone was over 10k...I'm sure it'd be less from a wreck, but probably not a TON less, certainly not the full powertrain. That's not counting labor or probably most of the wiring and accessories you'd need too.

Whereas the 250->350 cost difference is like 3-5k.
 

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1. Lexus not making a IS350 manual simply because its not possible?
-Laughed alot on this one, great assumption.

2. You act like we're modifying the 350 engine here?
-The computer will run the engine, yes the transmission and some VDIM control are missing, but I'm willing to put money that there is some way to fool the computer into thinking its in neutral or something or maybe it will run regardless as these control are auxiliry to the engine controls.

3. IS250 manual transmission will not hold the addional power.
-Again, great assumption, i'm pretty sure the thing will hold up to a 90/100 boost in hp/tq.

4. Wheres the spirit? I don't want you to think about all the reasons you can't do something, start thinking about ways you can.

5. "Seriously, the reason everyone is against it is it's a really dumb idea that simply won't work.

Oh, and the IS-F -does- have a different body. That's why the fenders and other parts don't interchange. The IS-F engine is larger so they had to make room for it."

Wow, so you think you can't source these IS-F parts and make them work on an IS350/250? Doesn't that mean they are interchangeable? You think its such a dumb idea and not realistic to swap an engine who not only shares a platform, but has the same bell housing and is a brother to the 250 engine? I've seen alot more unrealistic swaps completed. Your automatics bore me, i'd rather spend another 10 grand then trade into a slush box.
 

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1. Lexus not making a IS350 manual simply because its not possible?
-Laughed alot on this one, great assumption.
Yes, because you didn't understand what was said.

The manual in the IS250 is a crappy manual. It probably won't hold the power of the 350.

I'm sure they could -make- a new 6 speed manual that worked...for a large cost they'd never earn back because like 6 people on earth would buy it.

2. You act like we're modifying the 350 engine here?
-The computer will run the engine, yes the transmission and some VDIM control are missing, but I'm willing to put money that there is some way to fool the computer into thinking its in neutral or something or maybe it will run regardless as these control are auxiliry to the engine controls.
And you'd be wrong.

You don't understand how complex a modern car is. There's a number of ECUs in the vehicle, that all need to communicate with each other for the car to work properly. That's part of why using a standalone wouldn't work. The engine ECU expects assorted feedback from the transmission. It expects it to respond to signals it's sending and vice versa. If it's not there the engine ECU won't work properly, if at all.

I have no idea what you think you could make that would "fool" the ECU...the problem is, neither do you.

3. IS250 manual transmission will not hold the addional power.
-Again, great assumption, i'm pretty sure the thing will hold up to a 90/100 boost in hp/tq.
Then do you have any explaination for why they don't offer it that way? If it would just drop in then it'd cost them nothing extra to offer the option, and they'd make money on those 6 people who want it that way.

The only explaination that makes any sense is it won't hold the power and they don't want to spend a fortune inventing a new transmission. (I assume you know the manual in the 250 is from a toyota, Lexus didn't come up with that one either).


4. Wheres the spirit? I don't want you to think about all the reasons you can't do something, start thinking about ways you can.
Why would I want to think of ways to do something that makes no sense? You'd spend 2-3 times more than just buying the actual car that came with the engine would cost, and you wouldn't gain anything except a broken manual that didn't run right ever.

I also won't think of ways to poke myself in the eye for example.

5. "Seriously, the reason everyone is against it is it's a really dumb idea that simply won't work.

Oh, and the IS-F -does- have a different body. That's why the fenders and other parts don't interchange. The IS-F engine is larger so they had to make room for it."

Wow, so you think you can't source these IS-F parts and make them work on an IS350/250? Doesn't that mean they are interchangeable? You think its such a dumb idea and not realistic to swap an engine who not only shares a platform, but has the same bell housing and is a brother to the 250 engine? I've seen alot more unrealistic swaps completed. Your automatics bore me, i'd rather spend another 10 grand then trade into a slush box.

No, you continue to not undertsand.

THEY ARE PHYSICALLY DIFFERENT CARS.

The IS-F is wider to fit the larger V8 engine.

Source an IS-F fender. Try to put it on your 250. It won't physically fit.

So no, that would make them the opposite of interchangeable.

Not sure how much clearer that could be.


Oh, and here's -another- reason it's stupid.

The manual gets -significantly- worse mileage than the automatic, AND it'll be slower and the dragstrip.

So instead of spending 3-4k on just getting a fully working, fully warrantied, IS350 you want to:

Spend $10,000+ to put the 350 engine in a 250 manual so you can:

Go slower.
Get worse mileage.
Not run correctly (if at all) to begin with.

And you don't understand why nobody thinks it's a good idea?

Really?
 

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Wow, you are just a little automatic 350 fan boy aren't you? You act like you know everything and every result when in reality you haven't experimented or researched anything. If the IS-F is indeed wider, then my bad thats a very interesting peice of information. 250 Manual getting worse millage is bull shit, and the EPA ratings are simply incorrect as I have driven both. My Manual has gotten up 32 MPG on long highway trips, I have had multiple 250 auto's for rental and they consumed more gas no doubt and didn't reach the same numbers on the highway trips. There is less loss in a manual you can't argue that. Theres nothing wrong with the manual tranny in this car either, so you writing it off as a peice of shit means nothing to me as well. You sir are negative and want to tell everyone why something won't work and to be happy with the factory offerings. In the end there is no point in responding or discussing this point any further because your attitude supports a non-innovative discussion which I have no interest in.
 

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Wow, you are just a little automatic 350 fan boy aren't you? You act like you know everything and every result when in reality you haven't experimented or researched anything. If the IS-F is indeed wider, then my bad thats a very interesting peice of information. 250 Manual getting worse millage is bull shit, and the EPA ratings are simply incorrect as I have driven both. My Manual has gotten up 32 MPG on long highway trips, I have had multiple 250 auto's for rental and they consumed more gas no doubt and didn't reach the same numbers on the highway trips. There is less loss in a manual you can't argue that. Theres nothing wrong with the manual tranny in this car either, so you writing it off as a peice of shit means nothing to me as well. You sir are negative and want to tell everyone why something won't work and to be happy with the factory offerings. In the end there is no point in responding or discussing this point any further because your attitude supports a non-innovative discussion which I have no interest in.
I'm not sure why you say I haven't researched anything when I've given you detailed info on all the things that make your idea one of fail, and your answer is continually "why are you so negative?"

So ok, go ahead and drop 10k+ to end up with a car that doesn't run... I fully support you in this... best of luck!


(and yes, the manual gets the worst mileage of any IS...the RWD manual is even worse on gas than the heavier AWD 250.... the transmission is pulled from a toyota truck as an afterthought, it's clunky, and honestly not very good).
 

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I will ignore the ignorant comments about the efficeny being better in an AWD car or automatic. The transmission is the same series as that in the tacoma which has a larger V6... this is not the same exact trasmission and is specific for this car. I honestly don't care what you think it will cost or that you feel it will not run when done? Your comments on a transmission saying it is weak and then that it is designed for a truck is contradictive. A transmission designed for a truck with a larger engine and presumed to be under a larger amount of stress and load would be able to handle the power, no? Were you not enthralled by the IS430 that was created and how quick that car became? This swap WILL work, regardless of if you think it won't, and in the end even if $10,000 is invested; the resulting car would be a one off manual IS350 that would be fast, light, and im sure a blast to drive.

Oh, and on a side not, do you even own a manual IS or have you even driven one or seen the internals, clutch, flywheel etc? I have a stage 3 clutch and lightweight flywheel that I just had designed and I can tell you that these parts are very oversized. The flywheel was as large as the supra TT and the clutch is very similar as well. When I went into the deal I expected to find a much weaker setup for a stock sports car with a low power v6. The shuddering and noise issues of the stock flywheel and clutch setup are simply because the flywheel is huge and dual mass, and heavy for a much higher horse power car; the clutch has a fun time dealing with such a heavy setup with such little torque behind it, hense the need for higher spring rates in the F-sport clutch that was released. In the end, dropping some 22 pounds out of that flywheel/clutch setup has yielded a interestingly fast car that now loves to rev. On top of that the transmission clunking and noise into 2nd are gone and the gear box feels solid. Anyways, I'm just saying this transmission can hold some power and is by no means undersized for the car.
 

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I will ignore the ignorant comments about the efficeny being better in an AWD car or automatic. The transmission is the same series as that in the tacoma which has a larger V6... this is not the same exact trasmission and is specific for this car. I honestly don't care what you think it will cost or that you feel it will not run when done? Your comments on a transmission saying it is weak and then that it is designed for a truck is contradictive. A transmission designed for a truck with a larger engine and presumed to be under a larger amount of stress and load would be able to handle the power, no? Were you not enthralled by the IS430 that was created and how quick that car became? This swap WILL work, regardless of if you think it won't, and in the end even if $10,000 is invested; the resulting car would be a one off manual IS350 that would be fast, light, and im sure a blast to drive.

Oh, and on a side not, do you even own a manual IS or have you even driven one or seen the internals, clutch, flywheel etc? I have a stage 3 clutch and lightweight flywheel that I just had designed and I can tell you that these parts are very oversized. The flywheel was as large as the supra TT and the clutch is very similar as well. When I went into the deal I expected to find a much weaker setup for a stock sports car with a low power v6. The shuddering and noise issues of the stock flywheel and clutch setup are simply because the flywheel is huge and dual mass, and heavy for a much higher horse power car; the clutch has a fun time dealing with such a heavy setup with such little torque behind it, hense the need for higher spring rates in the F-sport clutch that was released. In the end, dropping some 22 pounds out of that flywheel/clutch setup has yielded a interestingly fast car that now loves to rev. On top of that the transmission clunking and noise into 2nd are gone and the gear box feels solid. Anyways, I'm just saying this transmission can hold some power and is by no means undersized for the car.

So you're saying I'm wrong that the stock manual sucks... but you had to have a custom flywheel and stage 3 clutch installed to make it not suck.

Anyone else see the problem with that?

The tacoma 4L V6 by the way only has 236 horsepower... a bit less than the 306 in the IS350. It even has less torque, despite being a truck.

Truck doesn't magically mean "way more power than a a car"

It won't work. You have no idea how the ECUs work, or talk to each other, and no idea how to fix the problem. What you're doing here is insisting that "it's an exciting idea, stop pointing out reality!" which is just silly.

And yes, the manual gets the worst mileage of any IS. According to me, accprding to the EPA, according to the results posted by drivers of both cars here and on CL, and according to Lexus themselves.

If you'd like I can name you a dozen -other- cars that all get worse mileage with a manual than an automatic too... most of them performance cars of some sort (audis, BMWs, a caddy CTS, the RX-8, etc)

The clutch pedal is a relic of the past. Modern automatics are vastly improved from their ancestors.
 

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The clutch pedal is a relic of the past. Modern automatics are vastly improved from their ancestors.
maybe if you're just driving your car to and from work

but the clutch pedal, for me, makes driving fun.. still lets me feel connected to the car.. and most of all gives the DRIVER more control over what the car is doing and when it's doing it

there's so many more factors that make manual trannies better from a driving/fun to drive standpoint

if you're not looking to control your car completely and all you want to do is cruise, then by all means.. auto trannies are great!

but come on, lets not call it a relic of the past, it just sounds like its not your cup o tea :)
 

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Your automatic is no sports car. Maybe if you had an IS-F or an smg or anything with a quick shifting transmission that is actually remotely fun to drive I would agree with you. Manual being a relic of the past? Take the manual transmission out of the picture and a could percentage of the enthusiests would be devistated. You my friend have signed over to the slush box. I will continue to row my own boat until some robot running off 1,000 computers tells me I can't. And don't tell me I don't know about ECUs or the ones in this car or the failsafe features etc. We haven't been using carbs since the 80s buddy; yeah the systems have become more advanced but don't act like we all haven't been dealing with it the last 20 years.
 

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That's great.

But modern autos and manumatics like SMGs are the future.

Even porsche is running faster times at the track -without- a 3rd pedal these days.

I mean, there's folks who like AM radio too, but it doesn't make it better.
 

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Your automatic is no sports car. Maybe if you had an IS-F or an smg or anything with a quick shifting transmission that is actually remotely fun to drive I would agree with you. Manual being a relic of the past? Take the manual transmission out of the picture and a could percentage of the enthusiests would be devistated. You my friend have signed over to the slush box. I will continue to row my own boat until some robot running off 1,000 computers tells me I can't. And don't tell me I don't know about ECUs or the ones in this car or the failsafe features etc. We haven't been using carbs since the 80s buddy; yeah the systems have become more advanced but don't act like we all haven't been dealing with it the last 20 years.
:hug: someone who understands
 

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anyhow back on the topic
im trying to find a Is250 with vdim and TCS
it seems the australian IS250 Sports Lux (top model) has VIDM and TCS
so i think that'll be a starting base
and is350 motor g box + ecu is around 4-5K USD
 

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anyhow back on the topic
im trying to find a Is250 with vdim and TCS
it seems the australian IS250 Sports Lux (top model) has VIDM and TCS
so i think that'll be a starting base
and is350 motor g box + ecu is around 4-5K USD
I can't speak to how they're optioned in Australia, but VDIM wasn't offered on the IS250 at all (in North America anyway) prior to 2009 models, at which point it was standard on all of them regardless of optioning.

Don't forget to change the rear differential too, since the gearing is different from 250->350

Not sure where you'll get a 350 diff if they don't sell the car there, but you're getting an engine and transmission from someplace, so I suppose the same source might have a diff for you too.
 

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everytime i come back to look at the my.is forums its always knightshade and some random my.is member arguing over the same topics over and over again... guys knightshade knows what he's talking about so it would be cool if you guys can be nicer and stop trying to be like the guys from honda forums...

and yeah the new autotrannies are definately quicker than most manuals out there
 

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lol well
now i am back
with a Sports pack IS250 and a auto
and VDIM :D
so yeah lets see where i can find a is350 motor tranny and whol drive line lol
 

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lol Danny, just go 2j!! haha

And you guys are arguing about nothing, he is in OZ, and we do not get the IS350 :(
 

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If he wants a 250 with a 350 drive train, swap badges. :)
 
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