what's the difference between twin screw, centrifugal, single turbo and twin turbo?

[warplane95]

Hello, I'd like to know the pros and cons that it brings to our engine?

[NomoreNA]

Twin screw = low end torque, centri = linear power/torque, single turbo = big power on the top end "high rpms", twin turbo = worthless on our platform. That covers the basics

[warplane95]

okey, and in theory whats the best for a drag? I think turbo is the best

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[Tansey86]

Originally Posted by warplane95

okey, and in theory whats the best for a drag? I think turbo is the best

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If you had to choose 1 to all out build and make the fastest for the 1/4 mile. Single turbo is the best.

[warplane95]

thank you :p and for a shot track and a fast track?

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[jamesm]

Twin screw supercharges are 'positive displacement'. This means, basically, that they move a fixed volume of air per revolution. So, being that they're connected via a pulley to the engine, the result is an engine that displaces more air, constantly, than it used to. They make boost off of idle. They are also much less efficient other options, and tend to favor low-end torque/driveability over high-end power. They also consume power to make power, which is an important distinction common to all mechanically driven superchargers (twin screw and centrifugal).

Turbos are exhaust driven compressors. They take energy otherwise wasted (hot exhaust) and turn it into power. This means that they do not suffer the same parasitic losses associated with superchargers. They are also typically more efficient, and are good for making big power up top. The downside is lag. They're not mechanically driven, so the boost is load-dependent. Modern turbos have largely overcome this. All else equal, a properly sized turbo will still put more area under the curve than most superchargers, even at low rpm. However, if you throw a GT35r on a 2 liter engine, you're going to have some lag. Size matters with turbos.

Centrifugal supercharger are a bastardization of the two, and IMHO, not worth consideration. They are mechanically driven turbos for all intents and purposes. So, you get boost that ramps up as RPM's rise. It's basically the worst of both worlds: limited efficiency, parasitic loss, etc. without the benefits down low of a PD blower. The upside is that they're generally easy to install and package.

In the end it comes down to what you prefer. It's very subjective.

[warplane95]

Ty for the answer. I love the sound of a big centrifugal ...

So, s/c is the best.

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[sw20kosh]

Originally Posted by warplane95

Ty for the answer. I love the sound of a big centrifugal ...

So, s/c is the best.

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...how did you come to that conclusion?

Centrifugal supercharger are a bastardization of the two, and IMHO, not worth consideration. They are mechanically driven turbos for all intents and purposes. So, you get boost that ramps up as RPM's rise. It's basically the worst of both worlds: limited efficiency, parasitic loss, etc. without the benefits down low of a PD blower. The upside is that they're generally easy to install and package.

[warplane95]

Oh sorry, I mean twin screw sc

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[warplane95]

Oh sorry, I mean twin screw sc.

I search on other forum and the majority said the turbo is more reliable and need less maintenance.

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[official_george]

So which one is the best for a daily driver FR-S? Not aiming for huge or track power here, I just want more juice since everything else is already perfect for me (except for the manual tranny, which is on another thread here).

[Tansey86]

Originally Posted by official_george

So which one is the best for a daily driver FR-S? Not aiming for huge or track power here, I just want more juice since everything else is already perfect for me (except for the manual tranny, which is on another thread here).

Turbo wins in pretty much every aspect aside from price and install time.

[mrk1]

It all comes down to personal preference, I like turbos on the street. Power when you want it but mellow when your out of boost, plus fun noises. On the track I really dont like them at all, to much of a variable coming on and off boost. A centrifugal supercharger gives a more linear power delivery so it can be more predictable on a track, however the lack of lower end torque is apparent on the street. All the FI options pose the problem of extra heat in an abusive environment.

So just look at how and were you really drive the car. All the options have pros and cons, they all have there followers and haters. Personally I bought this car because it is NA and will probably do a new final drive in the future, however if I had to choose a FI option I would go centrifugal supercharger for its simplicity and power delivery.

[Pete]

I have found that this is an emotionally driven topic. Everyone tends to claim that whatever solution they prefer is the "best".

The reality is that they all have good/bad characteristics and you must decide which of these characteristics is right for you and your car.

I would use Wikipedia to find the answers before I trusted any of the answers you will find here.

Good luck.