Hi im new to this site i have a lexus is 250 and im just starting to mod my car i have a magnaflow exhaust and k&n cold air intake and im looking into getting a turbo but cant find them anywhere on the web so maybe someone can point me in the right direction?

 

look harder in the classified its in there .......

 

what is that ?

 

There's only one kit that's available here in the US, or at least that's for sale right now...
Here it is: https://www.clublexus.com/forums/is2...ercharger.html

LMS makes another kit too, if you have the funds, make it happen.

 

There is no turbo for the isx50's

You can get a supercharger for a not so good HP gain for $8000+

There are quite a few supercharger threads around that you can gather some more info on

 

Thank you guys appreciate it and doees anyone know why ? and ive been looking and would a universal turbo kit work ?

 

There is no way to tune the ECU and high compression motors so there is no (well extremly limited) aftermarket options for increased power except for intake/exhaust.

 

there is definitely a way to tune the ecu to a certain degree with botht the HKS F-con and MAPECU3's setup.

I'm currenlty leaning mine out to about 12.5 afr and adding 4 degrees timing up top.

HKS350 just recently installed his F-Con and some other device and is able to more things than the MAPECU but he got his from a junkyard so expect it to cost much more. MAPECU products and install was 1400 for me.


I've been looking at the squires rear mounted turbo setup and will probably be going that route too. I think 385 whp is possible at 7 psi with my ability to adjust timing and fuel with stock injectors and everything. We'll see...

 

there are no commercial turbo kits for an ISx50.

There are a very very small # of supercharger kits for the 350

There are none (commercially available) for the 250 in the US, because it'd be 6-8 grand to add 50 hp. Whereas simply getting a 350 instead is only 4k more and adds 102 hp.

It makes 0 sense to try and boost a 250 in the US.

There are a couple supercharger kits for the 250 overseas, in countries where the 350 is not sold. Again, they run 6-8 grand and don't add as much power as even a stock IS350 has.

And while some limited tuning options (which are also relatively pricey) are just now becoming available, you're still significantly limited by the 12:1 compression ratio too.

Simply put, if you bought a 250 (in a country where the 350 is sold) to try and make it faster, you bought the wrong car.

 

speaking of, what size turbo would be best suited for the is350 to make that 385whp? I see a T3/t04 57 trim turbo up for sale in my local classifieds but I dont know if it'll flow enough.

I see that a turbonetics kit for the g35 uses a Turbonetics 60-1/Stage V .77 A/R Turbocharger. SHould I go for something like that or get this smokin deal on the t3/t04?

 

I would personally look at some of those that are in use on 350Zs, since the motors are similar and output would be as well. I assume that a totally stock block can handle an extra 100hp w/o harm; after all, its a gradual hp increase and not a "shock" to the system like nitrous would be.

 

The nissan 3.5's are so easily moddable(that a word?) and boostable (again a real world???), its strange how our lexus 3.5s are so untouchable compared to the nissan motor. Ah well, Infinitis are just LEXUS wannabees, feel meeeee!!

 

Nissan 350Z compression ratio: 10.6:1
Lexus IS350 compression ratio: 11.8:1

For boost purposes, that's a significant difference (and the 250 is even worse at 12:1)


I wouldn't assume the stock lexus motor can handle an extra 100 hp from boost... far as I know nobody has reliably run more than 50-60 extra hp via forced induction for any length of time... I think HKS350 is probably up in the 70hp range (though I haven't seen him post a dyno yet) and hasn't had issues yet, but that's still a long way from 100.

I wanna say Lobuxracer posted some math a couple years ago suggesting that 7-8 psi was about all the stock engine was physically capable of handling safely (once you got the fuel/tuning stuff right), which based on the results of the folks running a bit less so far would still leave you short of that mythical 100 hp...I'm sure someone could turn the post up with a search if they wanted.

 

yeah I know its a long shot, but I still want to try. What I'd really like is an is-f but it just doesnt make good financial sense to hop into car payments right now. So I boost, and I'll be able to hang with stock and slightly modified F's. Thats good enough for me right now.

On that note, it looks like a turbonetics T04E 60 trim with a .58 ar should be just right. It will allow up to 400 hp with excellent boost response with the 3.5 liter. I've contaced Squires to see if theyd like to make a kit up for everyone else. I doubt they respond but I'd be more than happy to be the guinea pig.

I'm going with a single turbo to replace that large canister in the midpipe area. That location would be perfectly suited for a turbo because its cavernous and already has heat shields in place. I'm not sure how well it will work going from a 2" on the outlet side of the turbine into dual exhaust though. On squires website, most dual exhaust cars run twin turbos so my plan might change. I'll be collecting the parts I need each month and hope to get this project up and running by spring.

 

What's the exhaust side of that turbo? Seems to me to be a bit small for a 3.5L. Hell, I had a 55 trim (.60/.63) on my Civic making 423whp at 19-20 psi. Yes it will spool up like a beast...but will you be able to put that power down though?