Ok, I don't want to look like an idiot asking this, but I am not a car expert, so can someone explain to me the difference between a SC and a Turbo?! Which one is better and why?

Thanks

 

read this...
http://www.howstuffworks.com/question122.htm

 

Basically,

SC= Belt Driven

T = Exhaust Driven

 

Here's a another link that should be helpful.

http://integra.vtec.net/geeser/megamax/super.html

 

i was gonna post the same link

 

It depends on what you want to do. The SC is what you get, meaning it gives the max about 80hps, so thats all you gonna get, while the turbo if the boost is set at 9psi, you can raise it to like 15 or what ever you want, just not too much or you might blow your engine. The Sc is not as much fun as a Turbo, atleats to me. If you really want clarity start reading SCC (Sport Compact Car) they have a great peice going on explaining everything there is to know about the SC and Turbo.

 

For the Maxima's VQ and other engines(ex: the new SE-R's QR) that put out a good amount of torque and power off the line, a low pressure turbo system would provide the most balance. This is because the SC's provide a bit too much power, and it just gives you wheelspin at the start. A low-boost turbo will kick in later(but not too much later!) after you've already gotten rolling, and still give you some power, but perhaps not as much as an SC. A high boost system will work the same way, but the lag can be even greater.
However, if someone were bold enough to try a dual-stage boost setup, that would be cool. Low boost for off the line, and then higher boost to make the big power in the upper-mid and high range.

 

Thank you all for the info!

 

Turbos more efficent but only kicks in after a certain RPM
Super has a broader power band but is about 40% less efficent

 

With respect to the current application, the only real advantage turbos have is being able to adjust the boost through use of a device such as an EVC (which controls the wastegate).

Centrifugal superchargers have dynamics similar to that of a turbo -- boost builds progressively as rpm's rise. This is different from positive displacement sc's (like Eaton), which are almost immediately at full boost.

Turbo's and Eaton s/c's aren't necessary in my opinion for the VQ. First of all, it's a transverse-mounted V6 in a very tight engine bay, so squeezing lots of complicated exhaust plumbing in there would just be a pain.

Second, Maxima Drivers who's taken his/her car to the strip knows how difficult it is to get off the line. You can add nearly 1.5 seconds to your time just by getting a bad start. Thank FWD, and a torquey engine that revves maniacally for this. For that reason, a hugely boosted midrange is just gonna be a burden. What VQ's need -- and what the 4th gen needs badly -- is more topend punch. And that is just what a centrifugal supercharger offers up.

BTW, the V1 and V2 superchargers can boost up to 20psi. It's just a matter of swapping out the pulley.

I agree turbos are great, but for our cars, they're just not needed.

 

The JWT turbo system has a 6psi/10psi switch that adjusted boost depending on factors such as gear, rpm, load, etc..

but IMO turbos aren't necessary. and neither are positive-displacement superchargers. centrifugal sc's are the best for our particular application.

 

with a turboed car, you have to let the car idle for a few minutes after you drive it... if you just turn it off when you stop you can blow the turbo

 

How much does the S/C hurt your mpg's? And what could I do to increase it from stock?

 

I thought thats what a blow off valve is for. or is it just to let off pressure from revs.??

 

BOV's keep charged air from bouncing off the butterfly valve in the throttle body and back towards the compressor (possibly damaging it) when you lift off the throttle.

 

well, in my opinion, a turbo is better suited for the VQ cause it has good torque already. Im not saying a turbo is easier to get into the Max but is better suited. Putting together a good running realible turbo system for the Max is a challenge. Look under my Max's hood and look under a supercharged Max's hood. i have SOOOO much more room to work with stuff.

 

a turbo timer solves this problem, not a bov.

 

Here is some more information between the two.

http://members.ozemail.com.au/~toptron/carclub/svt.html

 

Yet, another good site with information.

http://www.autosite.com/GARAGE/subsys/baturboc.asp

 

Where the hell did you learn that?!

A blow-off valve does exactly what I said it does. Don't believe me? Ask Maximamike. or Turbo95Max. or SCC. Or any half-competent mechanic who's worked with turbos.

A turbo timer keeps the engine running for a preset time after the key is removed from the ignition, allowing oil to circulate through the turbo a little longer..great after a day of hard driving, cuz turbos get red-hot.

There 16ftpole, you learned something today. Congrats.

!@#!@$% newbies...