it is an exhaust restriction to a certain extent, but its kind of hard for me to say that, all its doing is spinning that wheel, and that shit is extremely easy to turn, shit, i could turn the turbine with my own breath, its not more of an exhaust restriction than your stock manifold, i do like the fact that a supercharger doesnt have to be cooled down and its pretty much maintenance free, but your just not going to get the power from a supercharger that you can from a turbo, but the torque numbers are pretty fucking dope.........

 

greddy makes pretty good everything, so i would say go with their turbo.

but then again, im pretty happy with my supercharger.......something different. 10:5 compression isnt that bad, shit im running 5psi on my 10:6:1, ill probably be running a 8-10psi pulley when i decided to get hondata.

 

The amount of restriction all depends on the turbo. The bigger the turbo, the less the restriction. It also has to do with the other characteristics of the turbo: ball bearing or not, a/r, trim, blah blah blah. You can turn some turbos with your breath, some you can barley turn with your finger. But none the less, the turbo does pose some exhaust restriction. It may be barley any at all, but it is there.

 

Thats why you spray it too for the lag!

 

That depends on the setup. Its possible to have a turbo with no noticable lag. But if ya wanna go slapping a T-88 on a 4 cylinder... yeah... spray that shit.

 

they do restrict pretty much but it dont take all that much power from the motor and you wont notice it cause the restriction goes up with boost so the more restiction you have the more power its making at that point so you cant tell


like on turbo buicks the factory tuurbo is small so you dont get lag but in return it gets 2# of backpressure for every # of boost

that ratio of exaust pressure to intake pressure causes it to spin the turbo up faster

as you get into higher output turbo's (bigger) the wheels are matched to give a better ratio of pressure from intake to exaust..

like say the wheels are set up at 1.5# back pressure to each # of boost... at that point you make more power at the same boost level only because you have less back pressure but in return less pressure on the exaust side causes it to spin up slower (lag)

once you get up into big race turbo's you can get down in the 1 to 1 ratio on back pressure to boost but thats where you get into high rpms before you get enough exaust to spin it fast enough to start making boost

hope somebody can understand that ...LOL

 

Understood and agreed. My whole point has just been that turbos are not completley non-power robbing. People seem to think that they arnt, but they do a tiny tiny little bit. Not enough to make much difference, but they to.

 

Between your earlier statement and Reds "baffling" explanation (to most people it probably didn't make sense), I'll say that there's to many variables to make a correct statement about turbos.
Very small turbos have no backpressure at idle-low rpms but cause a restriction at high rpms. Big turbos are just the opposite, hard to turn at low rpms but flow ALOT better at high rpms.

 

I doubt that NISMO will be making turbochargers. I would get the PE's. But there's nothing wrong w/ Greddy either. I wonder if Pentroof has made manifolds for the Z33 yet!?! That's really the way to go!

 

I think I might have come up with a good way to think of it... it at least makes sense to me. Think of a revloving door compaired to just an open door. If you apply everything thats been said, and use people instead of exhaust gasses. It makes it easy to visualize.