brociouz

iTrader: (65)

The IS350 vs. 330i is not a fair fight; IS350 vs. 335i is. (I'm talking stock vs. stock.)

The BMW definitely has far more potential. Stock vs. stock, it's pretty close. Anecdotally, in my experience the IS350 wins (just barely) from a dig everytime.

Sffd103

iTrader: (16)

Don't think a turbo has ever been done on an IS 350. A supercharger has and actual HP gains have not been projected. about 6-8 lbs of boost. They are both great cars, but people favor a brand/make of vehicle.

stanjohn12

Why hasn't anyone added turbo's to their IS350 yet ? If it's possible I'm planning to add turbo's to my IS 300 once my warranty runs out.

chi123

iTrader: (12)

Not sure, but there's not many turbos that were made for the 2IS and those that are out there are expensive. Plus, we can only safely do like 5-7 PSI for the 2IS and that's not enough of an HP gain for the money. There are a few turbo'd IS350's on this forum and YouTube. Unlike with the BMW 335, those you can put it a $500 chip and the HP is raised from 300 to as much as 380.

brociouz

iTrader: (65)

^ AFAIK, no one has successfully turbo'ed a 2IS, only supercharged. The cost to horsepower gain ratio is absolutely ridiculous though - it's cheaper to just trade up to an IS-F.

Hoovey689

iTrader: (16)

The E90 3-series which debuted in 2006 same as the IS350, 330i was a 3.0L I6 with 255hp. It was completely outgunned by the Lexus's new 3.5L V6 with 306hp. Hence for the 2007 model year, 330i was dropped in favor of the 335i and it's TT 3.0L I6.

A 335i is better in regards to tuning. They can run circles around M3s with JB3, Dinan etc.. Some might say handling as well, but some good tires, chassis brace, sways, and coils will make the Lexus handle just as well. Steering feed back can also be improved with an IS-F damper. With the BMW though, you have to watch out for the HPFP which has a high fail rate. From a dig stock for stock against an IS350, despite the lower lbft number, it's the Lexus's aggressive gearing that makes it so formidable. On a side note, the interior of the IS is much better than the 3 which can best be described as bland. Despite the lack of tuning, the Lexus seems to be the better value in terms of bang for your buck, design, reliability, price and luxury. 3-series is a great car, but the Lexus suits my criteria better

Hoovey689

iTrader: (16)

Tuning is a problem due to the heavily secured ECU. Not to mention with engine compressions of 11.8:1 and 12:1 (350/250), it's hard to add boost like others were saying

Slowb4lls1

Seriously? A old m5 will Merk on a is350! Period! Anyone who knows anything about cars. At lower speeds 25-60 or so it's like a m3 but around 60 it wud teleport from a slow *** 2gr-fse hands down. Only a non driving **** like the one shown in this video wud get beat.

049x83

a friend of mine had a 2011 M3 which for some reason burnt a whole lot of motor oil....... IS350 FTW!!

stanjohn12

Oops I better stay away from 335i's then No turbo's for me. Has anyone tried an ECU upgrade ? What would be the horse power gain then ?

stanjohn12

Hmm sad to know that our 2IS's can't be tuned to get more from the mill. I hope and wish the next gen IS's are more tuner friendly.

stanjohn12

Even we could put those chips then right. I mean your taking about the ECU remap if I'm not mistaken. This would not be limited to the engine capacity.

stanjohn12

Hmm I don't know what these engine compressions ratios mean, honestly speaking. What would be the figures for 335i and 320i ? And how is it better than ours for tuning wrt compression ratios.

stanjohn12

Obviously Lexus is a million times better in every aspect compared to the 3 series. I just love the IS's interiors. BMW like you said is so damn bland ( interior wise ) and you might even commit suicide if you buy it without the options ticked.

I really didn't know that our 2IS's weren't tuner friendly. Lucky those 3 series owners in that regard, anyways they'll be smiling only till they get stranded on the side of the road

Kurtz

iTrader: (1)

There are no chips for the 2IS and no ECU reprogramming either.

There are a couple of piggy-back solutions available, but you're talking $1000+ for about 10 hp without doing extensive other modding.


What compression ratio is is a more complex topic, but the 335i compression ratio is only 10.2:1... which is a pretty huge difference from the 11.8-12:1 on the ISx50

Essentially the higher the CR the more prone the engine is to detonation... and forced induction is already compressing things, so combine that with a high engine CR and you're very limited in the amount of boost you can run without blowing up the motor.