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  #1  
Old 06-27-2011, 09:57 PM
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zaueugen zaueugen is offline
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supercharger or turbo?

which one would be better and morerecomended? which of the two are faster from already modded svxes?
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  #2  
Old 06-27-2011, 11:13 PM
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Re: supercharger or turbo?

Neither is easy at all. One problem is the amount of custom work that would need to be done, either piping for the turbo setup or a supercharger manifold. There were some supercharger kits made a few years back that aren't really around anymore.

In either case, the stock motor's bottom end won't hold up well past about 7 psi, maybe 9. Which isn't very much for the amount of effort required. Basically, if you want any big, reliable power you need to build the motor, which, again, isn't cheap and would take a very long time.

Basically, neither is very highly recommended unless you have a second car, a lot of money to throw at it, and a lot of time to spend doing the research on it.

The fastest so far is an extremely custom supercharger setup though: http://www.subaru-svx.net/forum/showthread.php?t=52285

A twin turbo setup might be more powerful, but fitting all that piping under the hood would be quite a challenge.

IMO, the best option for making a little bit more power is cams from ECUtune, and a stage 2 ecu, injectors, and MAF.
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Now a mod "over there" ............Photo album
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Old 06-27-2011, 11:20 PM
XT6Wagon XT6Wagon is offline
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Re: supercharger or turbo?

people have had good success with superchargers compared to turbos, but IMO its due to the previous lack of good enginemanagement.

To expand on this, normaly Superchargers are far less aftermarket friendly as you need more items with more precision in thier placement. However they usualy have a boost curve that is directly locked to the RPM of the moto. This makes the enginemangement needs of the motor far less than a turbo which has boost that is a result of a massive number varibles.

Given a Hydra or other advanced engine management that CAN map timing and fuel based on all those varibles turbos get really nice since it requires little precision in the mechanical side. Stick the turbo anywhere it fits, doesn't set stuff on fire, and is close to level. Run some tubing to and from it however you need to... and done.

That said, both rely on correctly sizing and installing the different parts. Both rely on having solid tuning with a reliable and powerful enough engine management.
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Old 06-27-2011, 11:25 PM
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3.3H6 3.3H6 is offline
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Re: supercharger or turbo?

do something crazy and go for both.
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  #5  
Old 06-27-2011, 11:30 PM
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Re: supercharger or turbo?

Quote:
Originally Posted by XT6Wagon View Post
Given a Hydra or other advanced engine management that CAN map timing and fuel based on all those varibles turbos get really nice since it requires little precision in the mechanical side. Stick the turbo anywhere it fits, doesn't set stuff on fire, and is close to level. Run some tubing to and from it however you need to... and done.

That said, both rely on correctly sizing and installing the different parts. Both rely on having solid tuning with a reliable and powerful enough engine management.
True! I forgot about engine management. Also really not cheap. The Hydra is supposed to be awesome, but it costs over $1k. The ECUtune stuff works well, but the stage 2 should max out (?) around 380 bhp.* More importantly, it's not tunable. A standalone ECU like the Hydra should make the whole thing work better and maximize the performance of the engine. It also requires tuning, which also costs a good amount of money.



*according to this spreadsheet: http://forums.nicoclub.com/370cc-inj....html#p3325164 (to be taken with a big grain of salt)
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'97 Ebony LSi ~137k #036.......Power mode mod, JDM clear corners, BBS wheels. AUX/pocket mod

Now a mod "over there" ............Photo album
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  #6  
Old 06-28-2011, 07:11 AM
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Re: supercharger or turbo?

Quote:
Originally Posted by XT6Wagon View Post
However they usualy have a boost curve that is directly locked to the RPM of the [motor].
This is true of centrifugals, but a twin-screw will hit full boost before any other method.

Forced induction on the SVX essentially comes down to your demands of ease to install and the boost curve you want. If you're asking my opinion, it'll look like this:

Centrifugal: Contact OT (svxfiles) - He's probably got the most current active formula for forced induction. This is the easiest install and the best aidabatic efficiency (least demand for an intercooler), but the inherent properties of the centrifugal give it the most lag of the three.

Twin-screw: Since ECUTune's Stage III is OOP, you'll have to come up with a custom intake manifold. When you do, it'll either be tight on plenum space or poke through your hood some, but boost is available anytime the engine's running.

Turbo: I'm pretty sure you have to use the Wayback Machine to find the last formulated turbo kit, but there have been a number of successful turbo installs. I'd consider this the most challenging install as the welding requires the most creativity and the necessity of an intercooler will demand some cutting. Beyond that, this is best described by somebody with more experience than I have.
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  #7  
Old 06-28-2011, 09:56 AM
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Re: supercharger or turbo?

Supercharger seems quicker off the line. Turbo seems faster later down the road when it spools up. If you want to be a part of the trend or younger crowd with blowoff valves and the like, go with a turbo. If your looking to laugh while those same guys are several seconds behind you, go for supercharger..
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  #8  
Old 06-28-2011, 10:44 AM
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Re: supercharger or turbo?

Quote:
Originally Posted by Freeman View Post
Supercharger seems quicker off the line. Turbo seems faster later down the road when it spools up. If you want to be a part of the trend or younger crowd with blowoff valves and the like, go with a turbo. If your looking to laugh while those same guys are several seconds behind you, go for supercharger..
haha i like the sound of that screw the turbo!! go supercharger!!
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  #9  
Old 06-28-2011, 04:11 PM
1986nate 1986nate is offline
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Re: supercharger or turbo?

I gotta admit, I was a much bigger fan (and still am to be honest) of supercharging, but after driving Phil's (PHASTSVX) old SVX which was running ECUtune stage 2 something something, that thing is a blast to drive and absolutely insane. stock internals, 9 psi intercooled dynotuned on 93 octane, it made me think of possibly turbocharging one of the others. You have to realize that Phil really took his time researching as well as put in the money to find what worked and what didn't work quite as well.

Either one have their own amount of fabwork and will require proper tuning. Running a PD supercharger, there is no way that ecutune will work for it. Hydra is a must and you will have to get a custom intake manifold made. With a Centrifugal supercharger or turbo, ECUtune software will work just fine while the Hydra will enhance things even further. Another important thing is that if you go with one of the superchargers, opening up the exhaust with true headers is a must or else the increase in exhaust flow will get bottlenecked in the stock exhaust setup.
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