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Old 10-14-2001, 09:26 PM   #1
T-Rex_Dino
Scooby Newbie
 
Member#: 9012
Join Date: Aug 2001
Location: Montreal, Canada
Vehicle:
2002 WRX Sedan
Platinum Silver

Default Turbo vs Supercharger

Need a little help here. I was having a discussion with a buddy about the difference between a turbo and a supercharger. Now I understand the difference, however, why do manufacturers (like Subaru with the Rex) prefer turbo to a S/C? Isn't a S/C less expensive to install and maintain? And why not put a S/C on a 2.5 L engine as opposed to a turbo in a 2.0 L engine?

On a N/A engine, people prefer upgrading to a S/C for cost reasons and ease of installation.

Also, isn't a S/C always on as opposed to a turbo only kicking in after a certain engine speed?

And why can't the Rex's turbo start spooling at 2000RPM as opposed to 3000RPM? Wouldn't that provide more torque at lower RPM? Would that sacrifice any power at higher RPM? Or is it because the turbo is too big for the exhaust pressure at such low RPM and therefore would not provide additional power?

I know that's a whole bunch of questions, but maybe someone can give me some insight as to the physics and/or mechanics behind turbo vs S/C in order for me to better understand.

Later...
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Old 10-14-2001, 09:31 PM   #2
bratmantlz
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Member#: 3231
Join Date: Dec 2000
Chapter/Region: RMIC
Location: colorado springs colorado usa
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88 626 Turbo
white

Default

easily put no one has areliable sc kit.. there are tons of turbo kits avail though. imo
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Old 10-14-2001, 09:36 PM   #3
totoherbs
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Chapter/Region: NESIC
Location: waltham, ma
Vehicle:
.... 122 IggPoints
Work... ahhh... so tired.

Default

you have a lot of ???

http://www.howstuffworks.com/ go there and look up turbos n superchargers. scc has some good articals too
http://www.sportcompactcarweb.com/


turbos are more effective then superchargers.
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Old 10-14-2001, 09:45 PM   #4
bvl
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Member#: 9255
Join Date: Aug 2001
Location: Philadelphia Area, PA
Vehicle:
2002 WRX Wagon
WRB

Default

Why not? OTTOMH you have

1. Cost

2. Ultimate power

3. Complexity of install

4. Race car rules and sanctions

You have to look more into a supercharger, versus a turbo-supercharger (technical name for a turbo

SCs are usually less thermally efficient, although some types such as Twin Screw/Lysholm are a lot better then roots blowers of old. There are several types of SCs, positive displacement, centrifugal, etc....so not all have the same
power curves, and you can't make a blanket statement about how SCs behave in the same way
you can a turbo (although with the turbo, you always have to know about the A/R, sizing, bearing types, etc...).

For ultimate race car power over high RPMs, a turbo will be easier to develop and maintain. With
the exception of top fuel drag racing, I don't
know of any other major race series using SCs vs NA or Turbo cars.

You are also correct: for a small displacement 4, a SC will have more noticable parasitic drag then something with displacement

That is not to say a 6-8 PSI SC for a 2.5L Scooby with a redline of 6000 RPM would not be a hoot...its just not what Subaru is used to doing.

With the ever increasing emmission requirements, you may see more and more OEM SC applications as they are not as difficult to get clean as a turbo system (easier to light off single cats, for example)

- b
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