Which is better and why?

depends on your needs. if you want instant power with a little less top end power supercharge. if you want a beast at higher rpm's and dont mind a little turbo lag, turbo's your best bet

so the supercharger helps to speed up quickly but not too much top speed... and the turbo helps to the top speed?

if i wanna to install super/turbo to my tC to have ordinary life car (work, school...etc) but sometime my friends ask me for a race.... which would be better in this case?

That's not exactly what he meant. Basically, you will feel the boost from the supercharger throughout the entire rpm range. You won't feel the boost from the turbo for the lower rpm range, but once it kicks in (spools up) you will get more power than from the supercharger.

If you want more power in everyday driving, I think a supercharger is a better way to go. If you want a lot more HP and more power in aggressive/race driving, turbo is better. That's how I see it.

ok, thanks... there is another supercharger besides the TRD?

With a properly sized turbo, you can actually reach peak at lower rpms. Superchargers are more linear, so the power output increases as the engine rpm increases. Once a turbo spools up, you will see a more flat power curve, meaning a little better performance. That is why you notice the turbo "kicking in" more. However, superchargers are less complex (especially the cenrifugal variety) to install and provide nice enough gains for the type of driving you are talking about. The TRD Supercharger that many of us are waiting for is supposed to produce about 40-50 more hp than stock according to scion. Centrifugal superchargers are also a little more friendly to fuel economy (under normal drivings) than the roots style supercharger.. just for a bit more info. There are some good sites out there that explain the pros and cons more clearly. Just do some searches online for Supercharger vs Turbo. Obviously you want to stay away from sites that are only trying to sell one or the other, as they will be biased. Hope this helps :-)

You also have to factor your warranty. The TRD supercharger will keep your car under warranty whereas the turbo will void it. Since you're looking for a daily driver, the supercharger would definitely be a safer bet.

The disinformation in this forum is astounding.

Turbochargers run off of your exaust system so there is less parasitic loss to the motor than a supercharger. Due to their inherent design (they need to start spinning before they can produce power) there is a delay before MAX boost is attainable. This is "turbo lag" but has become somewhat of a misnomer as this term is bandied about recklessly by automotive magazines and enthusiests alike. In order for OEM's to add large amounts of boost easily to production vehicles (ex. WRX) OEM turbo's tend to be mated to motors with low compression ratios. Although this allows relativly high boost amounts cheaply and safely on lower octanes, it really hinders the throttle response of the motor when it is not under boost. This lack of throttle response is ultimatly considered "turbo lag" by the common folk. A properly sized turbo will provide for both quick and sustainable boost, especially when paired with a motor that hasn't been 'handicapped' with an absurdly low compression ratio. For example: The subaru EJ20t would be a real dog to drive if not turbo'ed. This is what it is like before the boost comes on, and is not the fault of the turbo per se. Turbo's offer fantastic thermal efficiencies and because of this ultimatly higher horsepower than a supercharger could ever deliver in a streetable application.

This is not to say superchargers don't have their merit.

depends on your needs. if you want instant power with a little less top end power supercharge. if you want a beast at higher rpm's and dont mind a little turbo lag, turbo's your best bet you dont have to worry about it, but we tend to supercharge the xa/xb cuz it takes less work and is more reliable, our engine blow easy........ if i had a tc i would turbo in a heart beat, check out the freaking 533 hp blue tC man common do i need to explain.... 533 hp !!!!!! :clap:

Oh man not again.... :roll:

lol, its all good though, not much help but do whatever you really want to do.........

depends on your needs. if you want instant power with a little less top end power supercharge. if you want a beast at higher rpm's and dont mind a little turbo lag, turbo's your best bet you dont have to worry about it, but we tend to supercharge the xa/xb cuz it takes less work and is more reliable, our engine blow easy........ if i had a tc i would turbo in a heart beat, check out the freaking 533 hp blue tC man common do i need to explain.... 533 hp !!!!!! :clap:

They also probably had about 20 grand underneath the hood alone. Be very wary of anyone claiming that kind of horsepower without a huge amount of rebuilding. I am not saying that they didnt do it, only that it is not something you are going to get from simply bolting on a turbo. If it is the one I saw, they got ONE run at 530 or so horsepower, and said that it was running 30psi. Definitely a very heavilly modded motor! The other runs they kept the boost lower and had a little over 400... which still take a lot of mods to keep the engine together.

^^^^^^^^^^^^^ ya i know that, but im just saying even with that type of money, we wouldnt be able to get 533 hp or even close out of the stock block of the xB or xA engines...............and the tc with that hp was taken out and completely rebuilt with everything man, pistons, cams, block guards, larger throttle body and everything,............the works......and a twin turbo i think........was it>?

Turbo lag in the newer turbo systems are so negligable. t3/t4 turbo systems can spool up as low as 2000 rpms. Turbo vs. super charger is sooo 1970s Supercharge it if you want to keep your warrenty and have some fun on the track. Superchargers are nice and since you can keep your warrenty definitly a good idea to be an engine upgrade for your daily driver. If you plan on making your tC a track car. Turbo charge it to get the mean 500+ horspower you are looking for. Racing and drag racing should be kept on the track and off the streets. For a daily i'd do the supercharger. People boasting about mad power from thier turbos are pretty quiet when johnny law is around and getting the high number boosts and keeping your car emissions legal is very expensive (not impossible). Its all in what you want your car to be.