New owner build options - Lexus IS Forum
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post #1 of 5 (permalink) Old 07-01-2019, 01:31 PM Thread Starter
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New owner build options

I am looking at getting an is/altezza and was wondering what my options were as far as a build goes originally i was going to just build the stock motor but i am finding out that is not so cost efficiant so i was wondering what kind of numbers i could make for 10k post purchase and what motor options there are na-t, beams , 1jz , etc.
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post #2 of 5 (permalink) Old 07-01-2019, 02:06 PM
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There's not a whole lot you can do to the GE-VVTi to make a lot more NA power. Header, exhaust ,ported head, cams, ported intake will give you some gains, but hp per dollar will be bad (but then again naturally aspirated hp/$ is always expensive).

BEAMs would be cool in its own way, but it comes in a higher state of tune than a GE-VVTi right out of the box, and will be even more difficult to get NA power out of it.

NA-T vs GTE is a wash, in my opinion. With the GTE, you have advantage of strong rods and correct compression for boost without opening the engine. You also get an exhaust and intake manifold bolt pattern that's easier to work with than a GE. The disadvantage is you pay extra for it, and most people throw the exhaust manifold and turbos away. You'll also need a bespoke wiring harness. I think the money is better spent on putting good rods and pistons (and freshening it up with new seals, etc) into your existing GE-VVTi.

$10k will definitely get your engine setup all squared away with good manifold, turbo, ecu, tuning, fuel system, etc. However, you'll still need a transmission/clutch solution. You'll probably also want upgraded brakes and suspension components.
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post #3 of 5 (permalink) Old 07-02-2019, 12:58 AM Thread Starter
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Would i be better off then going for a lower hp build and refreshing the moter so i can have money to build the suspension my ultimate goal is a well balanced car that can be competitive on track days and twisties up in the canyons there might be better car choices for that but i absolutly love the looks of the is300 and i want a rwd platform because i want seat time in a different drivetrain than awd
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post #4 of 5 (permalink) Old 07-02-2019, 08:56 AM
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I think the stock IS300 is a pretty well balanced car to begin with. Adding a turbo, several hundred pounds and several hundred horsepower will definitely un-balance it!

I have two of these cars, one is turbocharged and the other stock aside from IS350 front brakes. I actually enjoy the stock car just about as much because I can drive it hard and NOT be dealing with triple-digit speeds.

For your purposes, I think the $$ would be better spent on light wheels and good tires, big brakes, polyurethane suspension joints and a GOOD set of coilovers. After that, some basic NA power upgrades like header, exhaust and maybe some camshafts to spice things up a little.
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post #5 of 5 (permalink) Old 07-05-2019, 01:26 PM
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If you're not looking for crazy hp the 1jzgte vvti isn't a bad option. The motor is cheap, bolts up easily and the existing 2jzge wiring harness can be used. Plenty of bolt on aftermarket support to make for a solid 450hp setup.
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