i kno there is about 306 hp on a is350, i ordered a f sport intake in hopes of gettin a bit more hp, but is there anything else i could to speed it up a bit? exhaust? i dunno

 

There's a performance section for a reason....intake/exhaust/weight reduction is the only way to make our cars faster besides nos.....

 

supercharge it...

 

In the US at least there are 0 supercharger or turbocharger kits available.

The car has an 11.8:1 compression ratio so you'd destroy the engine with anything much above 5-6 lbs of boost anyway.

LMS made one for a while (5 lbs for boost for a $6000 kit) but they stopped because nobody would pay that much for that little.

If you're lucky enough to have a JDM (japanese) IS350 then you can buy TOMs supercharger kit, that costs $10,000 and adds 5.8 lbs of boost on 100 octane fuel.

There is NO aftermarket engine management available whatsoever.

A company called MHP claims they can reprogram the stock ECU, but AFAIK they've yet to actually do it on an IS350, and their normal price to do the ECU/TCU on a 350 would be $2800, and they think they might can get 15 horsepower out of that.

Nobody makes headers for the car either.

Your intake will add 5 hp, which is as much as any intake will.

For exhausts you have a ton of choices, all of them running $100 per hp and up (axle-backs which add 7 hp, or full exhausts which add 10-12 depending on if you remove or replace the cats... with pricing starting around $700 for axle backs and around $1000-1200 for the fulls).

Lighter wheels and tires are always helpful on any vehicle, but usually not cheap.

That's about it.

Oh, you can do nitrous. Jeremy has safely run both a 55 and a 65 shot. Do it wrong and new engine though.

 

thanks for the help =]

 

Didn't mazzuri make headers for the 350?

 

Mazzuri, who is out of business now, made a couple of experimental sets... none ever gained any hp... they might have gained some torque, but nobody ever managed to do a convincing test of that fact... and there were various problems with the O2 simulator on later models as well.

 

So basically, you can say the same for the IS250 as well? It kind of suck that they're not highly customizable aside from some cosmetic upgrades, but the IS in general already look too darn sexy.

 

The 250 actually has a slightly -higher- compression ratio (12:1 rather than 11.8:1), and is DI only (rather than the dual injection fuel system on the 350) making forced induction even tougher.

Certainly for intake/exhaust you're looking at the same deal
where you'll get 5 hp tops intake, and 7-12 exhaust tops depending how legal you want to be.

Now, the headers Mazzuri made for the 250 supposedly showed VERY good results (though I'm unsure I ever saw a dyno from someone other than Mazzuri) but since he's out of business that's kind of a dead end... there's 2 other vendors who sell headers for the 250, but one is insanely expensive, the other insanely cheaply made from reports, and I've not seen a reliable test of either set.

But overall the best way, by far, to add power to a 250 is to trade it in for a 350 (or even cheaper, just buy the 350 start with- over 100 hp for $3500)