LS3 swap for 07' IS250
06-02-24, 04:58 PM
#1
4th Gear
Thread Starter
LS3 swap for 07' IS250
Hey y'all, I've been wanting to do an ls3 swap for my is250, there's a 416ci supercharged ls3 long block for sale and was wondering if it would fit at all. I can't find the dimensions for the 4gr-fse so i'm not too sure how big in perspective it is compared to the 4gr.
06-04-24, 12:16 PM
#3
4th Gear
Thread Starter
06-04-24, 07:41 PM
#4
Intermediate
LS swaps fit just fine, you can even do the social media clout way and purchase everything already prefabricated and ready to drop in, then claim it's "built not bought". Where you lose the thread and the regular forumgoers is getting greedy with the blower. That's "buy a different car" territory for blatantly obvious reasons to anyone who's popped the hood on their 2is and understands the geometry of modern positive displacement blowers. Pretty sure you'll be taking a sawz-all to the cowl, or at the very least running no hood.
You can produce more power than the factory suspension bushings will tolerate with a rowdy n/a 5.3l. Properly warmed over, any brand of 10:1 CR pushrod V8 can make 1.4 ft-lbs per cubic inch, the RPM at which it produces peak hp is dictated by camshaft overlap; see Dave Vizard and Richard Holdener videos for how. On a 325cid LS, that's 450+ ft-lbs of torque...a good 60-plus more torque than the factory put in it with the 2UR. Couple good hard launches and corners under throttle, the rubbers will start ripping, so you'll eventually want to superpro or whiteline the rear, at least. Go to a 6.2l engine that you've properly set up, and you're hitting the asphalt with 525lb-ft--I cannot stress this enough--naturally aspirated. Nobody on this forum has fit tires big enough to apply that kind of force yet; we need an AWD frankenswap or someone to tub their 2IS to use that kind of low-end grunt. We're in the same weight class as camaros, and they can take a 325 wide tire, which are wider than the 35x12.50's on my truck.
And you start talking superchargers? GTFOH. Go buy a no-title $200 turd from fb marketplace, weld the spiders, and hammer on it until it dies. Same effect, less money, more fun.
You can produce more power than the factory suspension bushings will tolerate with a rowdy n/a 5.3l. Properly warmed over, any brand of 10:1 CR pushrod V8 can make 1.4 ft-lbs per cubic inch, the RPM at which it produces peak hp is dictated by camshaft overlap; see Dave Vizard and Richard Holdener videos for how. On a 325cid LS, that's 450+ ft-lbs of torque...a good 60-plus more torque than the factory put in it with the 2UR. Couple good hard launches and corners under throttle, the rubbers will start ripping, so you'll eventually want to superpro or whiteline the rear, at least. Go to a 6.2l engine that you've properly set up, and you're hitting the asphalt with 525lb-ft--I cannot stress this enough--naturally aspirated. Nobody on this forum has fit tires big enough to apply that kind of force yet; we need an AWD frankenswap or someone to tub their 2IS to use that kind of low-end grunt. We're in the same weight class as camaros, and they can take a 325 wide tire, which are wider than the 35x12.50's on my truck.
And you start talking superchargers? GTFOH. Go buy a no-title $200 turd from fb marketplace, weld the spiders, and hammer on it until it dies. Same effect, less money, more fun.
Last edited by Ultra4; 06-05-24 at 04:42 AM.
The following 2 users liked this post by Ultra4:
2013FSport (06-07-24),
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06-07-24, 09:28 PM
#5
LS swaps fit just fine, you can even do the social media clout way and purchase everything already prefabricated and ready to drop in, then claim it's "built not bought". Where you lose the thread and the regular forumgoers is getting greedy with the blower. That's "buy a different car" territory for blatantly obvious reasons to anyone who's popped the hood on their 2is and understands the geometry of modern positive displacement blowers. Pretty sure you'll be taking a sawz-all to the cowl, or at the very least running no hood.
You can produce more power than the factory suspension bushings will tolerate with a rowdy n/a 5.3l. Properly warmed over, any brand of 10:1 CR pushrod V8 can make 1.4 ft-lbs per cubic inch, the RPM at which it produces peak hp is dictated by camshaft overlap; see Dave Vizard and Richard Holdener videos for how. On a 325cid LS, that's 450+ ft-lbs of torque...a good 60-plus more torque than the factory put in it with the 2UR. Couple good hard launches and corners under throttle, the rubbers will start ripping, so you'll eventually want to superpro or whiteline the rear, at least. Go to a 6.2l engine that you've properly set up, and you're hitting the asphalt with 525lb-ft--I cannot stress this enough--naturally aspirated. Nobody on this forum has fit tires big enough to apply that kind of force yet; we need an AWD frankenswap or someone to tub their 2IS to use that kind of low-end grunt. We're in the same weight class as camaros, and they can take a 325 wide tire, which are wider than the 35x12.50's on my truck.
And you start talking superchargers? GTFOH. Go buy a no-title $200 turd from fb marketplace, weld the spiders, and hammer on it until it dies. Same effect, less money, more fun.
You can produce more power than the factory suspension bushings will tolerate with a rowdy n/a 5.3l. Properly warmed over, any brand of 10:1 CR pushrod V8 can make 1.4 ft-lbs per cubic inch, the RPM at which it produces peak hp is dictated by camshaft overlap; see Dave Vizard and Richard Holdener videos for how. On a 325cid LS, that's 450+ ft-lbs of torque...a good 60-plus more torque than the factory put in it with the 2UR. Couple good hard launches and corners under throttle, the rubbers will start ripping, so you'll eventually want to superpro or whiteline the rear, at least. Go to a 6.2l engine that you've properly set up, and you're hitting the asphalt with 525lb-ft--I cannot stress this enough--naturally aspirated. Nobody on this forum has fit tires big enough to apply that kind of force yet; we need an AWD frankenswap or someone to tub their 2IS to use that kind of low-end grunt. We're in the same weight class as camaros, and they can take a 325 wide tire, which are wider than the 35x12.50's on my truck.
And you start talking superchargers? GTFOH. Go buy a no-title $200 turd from fb marketplace, weld the spiders, and hammer on it until it dies. Same effect, less money, more fun.
06-10-24, 11:02 AM
#7
Anyone can LS swap anything. Its the actual integration to keep the luxury features functional that complicates the install as most would want the power steering, VDIM, ABS, and well everything to work without 2000 OBD error codes. Not to mention keeping it registered so you can drive it.
Do a search in the IS-F forum for track built IS-F. The guy gutted the car and maybe that's your plan?
Last edited by 2013FSport; 06-10-24 at 11:11 AM.
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Karmedy (06-10-24)
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