Turbocharger vs. Supercharger for IS350 - Page 2 - Club Lexus Forums

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View Poll Results: Turbocharger or Supercharger for IS350
Turbocharger 22 36.07%
Supercharger 32 52.46%
Neither - IS350 is fast enough OR N/A mods are fine OR not worth the potential issues and cost 7 11.48%
Voters: 61. You may not vote on this poll

Turbocharger vs. Supercharger for IS350

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Old 11-14-06, 08:32 AM   #16
NovaIS350
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Quote:
Originally Posted by IS350jet View Post
I agree with this statement. However, most people thinking of turbo are looking at well over 10 lbs of boost whereas a supercharger on this engine would be more like 4 to 6 lbs. The compression ratio on the 350 is 11:1, much too high for either. I'm waiting for someone to install 8:1 pistons and blow 20 lbs.through it! Turbo or supercharger? Each has it's drawbacks and each has it's advantages.
Totally agree..both have pro's and con's. Really depends on your application. If I had money to throw away..i'd supercharge my twin-turbo and fill up with race fuel...then on earth day I'd burn a field of tires..bat some seals...punch a baby or two. how bout them apples?


IMO...seeing 50-60 naturally aspirated HP extracted from this motor would be way cooler. Anyone can slap a blower or some snails and say, "hey look my car makes 900 whp!" But nothing beats the driveability and feel of a powerful naturally aspirated motor. KEYWORD: In My Opinion. Got my flame suit on

Last edited by NovaIS350; 11-14-06 at 08:40 AM.
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Old 11-14-06, 09:24 AM   #17
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306hp (read: stock) is just fine for now, but if i had the funds to do it i'd do a twin-turbo kit.
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Old 11-14-06, 09:33 AM   #18
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Quote:
Originally Posted by IS350jet View Post
I agree with this statement. However, most people thinking of turbo are looking at well over 10 lbs of boost whereas a supercharger on this engine would be more like 4 to 6 lbs. The compression ratio on the 350 is 11:1, much too high for either. I'm waiting for someone to install 8:1 pistons and blow 20 lbs.through it! Turbo or supercharger? Each has it's drawbacks and each has it's advantages.
I'm pretty sure someone has already got a supercharger working on an IS350 using the stock pistons, haven't they?

I don't know how much boost they got or what their power output was, but they had it up and running. They posted videos of it a while back.
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Old 11-14-06, 09:36 AM   #19
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Quote:
Originally Posted by RocketGuy3 View Post
I'm pretty sure someone has already got a supercharger working on an IS350 using the stock pistons, haven't they?

I don't know how much boost they got or what their power output was, but they had it up and running. They posted videos of it a while back.
uh yeah?...ddquach's car is blown with stock internals...I think he is only running 6lbs of boost.
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Old 11-14-06, 01:58 PM   #20
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I would like to see an actual dyno of one of these S/C IS350's. A lot of talk and no information. I emailed LMS, but no response as of yet.
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Old 11-14-06, 02:58 PM   #21
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Quote:
Originally Posted by richw350 View Post
I would like to see an actual dyno of one of these S/C IS350's. A lot of talk and no information. I emailed LMS, but no response as of yet.
Rich,
If you search you'll find one or two

Advanced search
http://www.clublexus.com/forums/search.php

Select the 2nd gen IS forum and put 'supercharger dyno' in the search box

THis thread pops up
http://www.clublexus.com/forums/show...ercharger+dyno

Links to this thread with the dyno you're looking for
http://www.clublexus.com/forums/showthread.php?t=230794


and others that you'll find interesting... examples
http://www.clublexus.com/forums/show...ercharger+dyno
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Old 11-14-06, 02:58 PM   #22
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The shape of the piston dome is patented. It is integral to the direct injection's ability to create a stratified charge. It will take a LOT of work to get a lower compression piston with the right squish to run successfully for big boost in this engine. Besides that, no one really knows what will happen to service life with this bottom end. And before I hear about the Team Lexus engine, remember, racing engines can have a service life as short at a few hours. It's not exactly what you'd want in your luxury sedan.

All that said, it doesn't much matter how you compress the air. Superchargers are really great for stoplight duty, turbochargers are great for track days. I've owned both, and I'd take a supercharger for a street car any day. For a track day, I'd rather have a nice small/medium single turbo, even with a V engine because it's simpler to implement and less likely to have issues. Also, it's a lot cheaper to replace one turbo than it is two. JMHO.
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Old 11-14-06, 03:00 PM   #23
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Anyway you slice it, i'll stick to my guns, and say a supercharger is probably a better bet for a useable increase in power.

Last edited by Irishman06; 11-14-06 at 04:08 PM. Reason: in retrospect, the longer version was not entirely related to the forum or the thread. If you really want it, I can PM it to you.
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Old 11-14-06, 03:06 PM   #24
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Guys please

1) keep this discussion polite please

2) keep this discussion topical to the IS350 where possible. The turbo vs supercharger is a well beaten discussion... what matters here is how these two power adders will work within the constraints of the 2IS configuration. And there is a lot we don't know with only two (that I know of) on-the-road FI 2IS in the US, not counting the Blitz prototype stuff or anything in Japan or elsewhere.

If you want to debate dragsters, funny cars, the 2JZ-GTE engine, flying cars or the supercharged Oscar Meyer weiner mobile let's start a thread in car chat .

Last edited by DaveGS4; 11-14-06 at 03:16 PM.
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Old 11-14-06, 03:33 PM   #25
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Thank you guys for the replies!! I know that people have their own opinions about which is better and which is not depending on the circumstances. However, I can write up pages that will prove which one is better under certain circumstances. And the answer does vary depending on the conditions. And after studying Turbos and Supers in school to death, I will say that they both have their pros and cons.

For example, turbos are laggy but, thanks to modern design technology they are able to reduce the lag time quite a bit. However, superchargers are more responsive and have a parasite power loss since it extracts energy from the engine. This are just a few examples that I am mentioning....

I am an engineer and a businessman, so my initial purpose was to see what kind of distribution there is between the two. Now, I know they already have a Supercharger kit for the is350. If all goes well, I wanna work on the Turbo kit anytime soon. Again thanks for the replies! And please keep 'em coming!
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Old 11-14-06, 04:47 PM   #26
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You could always put two turbochargres in there... I'd go w/ a supercharger otherwise..
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Old 11-14-06, 09:23 PM   #27
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Quote:
Originally Posted by NovaIS350 View Post
uh yeah?...ddquach's car is blown with stock internals...I think he is only running 6lbs of boost.
that is correct, all stock internals. I wish someone would make forge internal for the car already. I want more boost...
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Old 11-14-06, 09:24 PM   #28
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Quote:
Originally Posted by richw350 View Post
I would like to see an actual dyno of one of these S/C IS350's. A lot of talk and no information. I emailed LMS, but no response as of yet.
Try calling them...
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Old 11-14-06, 09:28 PM   #29
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Hey Doug, when you gonna satisfy all of us drooling over your car with a dyno video? Please, please!!!

Javier
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Old 11-15-06, 12:22 AM   #30
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neither. trade in the IS and get the 335i and boost controller
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