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LSX IS250 Engine Swap

 
Old 11-05-16, 09:48 AM
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Mwone1
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Default LSX IS250 Engine Swap

Former Is300 Owner here, Its been a long desire to build an LS swapped Lexus. After finally gearing up to pull the trigger, I decided I wanted a newer car....
I found an '07 Is250 6 speed Car locally in great shape, high mileage. Perfect Candidate.... After Reading Thumpers Thread numerous times, I Convinced myself It would be easy. HAH.
07' Is250 LSX swap 6MT

I've decided to change it up a little with this car in hopes of simplifying the Swap for others to pursue. First, I'm Hoping to keep the Electric Power Steering, ABS, factory gauges, etc... I think starting with a 6 speed car will be considerably easier to swap. I'll be using a 6.0L Lq4 engine out a Silverado 2500HD. Ive got a good collection of parts so far and I have access to a Full Fab Shop, So I hope it will go quick and easy.... Also This car will be turbocharged when all said and done. Probably not right off the bat. My girlfriend was Daily Driving the car up until about 2 months ago when the radiator cap failed. The motor puked all the water out and melted itself down, so she's encouraging me to get it running again. LOL. We'll just keep it simple for now until I can get her another car.

6.0L Lq4 Ls swap Is250

I sourced a T56 from a 01 Camaro SS, supposedly has Upgraded synchros, polished shafts, etc...

T56

I Found a Mcleod Twin Disk on Craigslist for dirt Cheap too!

McCleod LSX twin Disk

Let's Cut this Biscuit up.....

Teardown There Soo Much room in here, this is exciting.


Bye Felicia


anyone need a 6 speed trans..... Lol
Motor Prep for the Custom Oil Pan to clear the Factory Steering.......

HAh, it fits, We already knew that......

Guess what also fits> ?
Twin Turbo Lexus IS1250
Just kidding, Those Belong to a buddies car......

Twin Turbo Camaro
Thats it for now, I have work to do.

I've got the oil pan Fabbed up and the wiring Harness conversion started, I'll update this post later tonite with more stuff.
The Motor Mounts are being built today too.
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Old 11-05-16, 05:37 PM
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bbaugher47
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Wow. Thats awesome! Good luck!!
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Old 11-05-16, 07:38 PM
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Wouldn't be the first V8 conversion I've seen done, but nonetheless still killer! Amazing how well them V8s fit there huh!
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Old 11-06-16, 05:15 PM
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This is awesome! Finally a good way to give the 250 the power it is lacking lol. Can't wait to see it once its finished! Good luck!
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Old 11-20-16, 12:49 PM
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Making some more progress this weekend.

I Mocked up the oil pan with some cardboard templates
Is250 LSX oil pan

Transferred the Template to 1/8" alum, Put some bends in it, Less Welds, Better!
LSX Oil Pan Fabrication
Next, Weld er Up.
Is250 LSX oil Pan Is250 LSX oil Pan Is250 LSX oil PanTest Fit Time!





Seems good to go, Could use a bit of Adjustment in a few places for better fitment, Make note for the next one

On to the Motor Mounts.
Started the same way, Cardboard Templates, Transfer To Metal, Make pretty, Etc...



Tack them in place....




You'll See why there is excess metal in the Next picture. Its Meant to wrap around the ends.


Once

.
Nice and Tidy, Slim to make for plenty of room for Turbo Plumbing.

I also Picked up a LS3 intake Like a dumbass, only to realize about 30 minutes after buying it, It has the wrong port shape on it. So its for sale, and I have an LS1/LS6 Cathedral Port manifold coming.
Or I will Just Make one Like this. This One fits under the hood of a Corvette, It should fit in my Lexus.




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Old 11-20-16, 04:55 PM
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black X's suck. I'm sure it's coming along nicely though, can't wait to see the build pics.
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Old 11-21-16, 08:52 AM
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finally someone is engine swapping this mf
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Old 11-21-16, 08:54 AM
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Lovely, looking forward to updates.
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Old 11-21-16, 11:31 PM
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Sweet project!

Are you going to try run the engine with something like a Haltech then just run the factory ECU parallel or do you have other plans?
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Old 11-24-16, 06:44 PM
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I'm definitely following this one. Best wishes!
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Old 11-28-16, 03:49 AM
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Imagine the look on someones face when you pull up next to them at a stop light and they hear that thing idling. Especially if the exterior is left mostly stock.
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Old 11-28-16, 05:00 AM
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Looks great so far. Can't wait for more progress.
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Old 12-11-16, 03:35 PM
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Looks awsome! In for updates
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Old 12-22-16, 12:03 PM
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Originally Posted by jrule2 View Post
Sweet project!

Are you going to try run the engine with something like a Haltech then just run the factory ECU parallel or do you have other plans?
Both Factory ECU's for now with HPtuners on the GM PCM.
Stock Lexus ECU to run gauges, whatever other things It needs.
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Old 12-22-16, 12:15 PM
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Maybe a Big Single will Just be the icing on the cake.....

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