OK, everything I know about engines (Not a whole lot) I piece together from reading about and watching racing. I learned from the WRC that smaller engines perform better with turbochargers rather than superchargers, because less power is lost at low RPM (But then there was that Lancia with BOTH, and the turbo shut off at a certain RPM letting the super take over).

In browsing this forum, I've seen superchargers recommended over turbos several times: Why exactly?

Not that it really matters, since if I got an xA I couldn't see sinking another $2500-3500 into it: I might as well have just gotten them Impreza in the first place LOL.

 

it depends on personality imo. if your an anxious person who wants instant power than go sc, if you want a beast (not that it would matter on a xa) go tc

 

Due to how turbochargers are designed, in order to get the most out of a turbo you need a higher reving motor than our 1.5L. Not to say a t/c wouldn't perform well on our motors, but it wouldn't show as much gain if you compared the exact same turbo on a 1.5L that redlines at 7 vs. 6,200.

S/c also have the no-lag advantage, therefore its basically "instant power". Both applications would work well on the 1nz-fe, but most tend to go with the more practical way of forced induction. IMO. Personally im debating on either the power enterprise s/c or getting a turbo custom built.

Anyway, good luck!

 

the reason i went with the blitz s/c because so far this is the only s/c that actually fit w/o mods and safer in the tear n wear because i can turn it off. i originally was getting pe but i was told that there is still kinks and needs minor mod to fit...it's not a direct bolt on as they claim it is.(only from what i've heard)

 

It all depends on how much you want to spend. Also how you want your power to come on. Lets take a look at a few things that could help with the power idea. You need to look at not only the PSI that will be used, but the CFM. If you match the CFM with the PSI you will be running. You can after all only force so much air into the cylinder before you start getting pressure built up in the manifold. So if you match your peak CFM with how much the cylinder can hold @ your PSI level, you will get better gains.

Now as for the S/C vs T/C thing. The S/C takes engine power to make its power. It can take up to 40hp from the engine to produce an extra 100hp to the ground with a supercharger. Now the main advantages are the fact that the S/C normaly builds a nice & steady power band, with power added from the get go. The T/C can build power all over depending on some things. The Turbo runs off of exhaust. The exhaust spins a turbine etc.. So at lower engine speeds, you have less exhaust wich causes "turbo lag". Once the turbo is spooled up is when you will see your power build. So if you match a turbo to your engine CFM needs, I could see a good set up that could build power from 1500rpm+. The main thing with the turbo is to get one of the right size for your engine. This would take a lot of research & maybe even testing to see what unit can produce the most power for the $.

So in the end its up to you on what you want to do. On something like the 1NZ-FE engine, I would just go with a S/C for simple install compared to a full T/C with intercooler etc..

 

Naa...turbo straight up...true that these engines dont rev high but it dont take too long to be at full spool on a small T20. I got the turbo kit yesterday finally so I will let ya know how it is.

 

what turbo kit did you get?

 

TSI kit but im not gonna use the injector interface...i got a 255LPH instead of 130LPH fuel pump that im hoping will be good enough for fuel delivery. Upgraded to the perrin fuel rail and celica 2zz injectors, aeromotive FPR and will be controlling the A/F w/ the camcon etc

 

like someone already said here the turbo kit relies on exhaust gases flowing out
of the exhaust manifold to turn the turbine in the turbo housing.

yes you could get a smaller turbo to reduce turbo lag but then the smaller turbo
dies out a whole lot quicker at top end because its so small. Therefore you might
as well get the supercharger because its "instant" power since it is belt driven, meaning
that when your belts are turning its already force feeding the engine.

Now don't get me wrong...i have a 98 Eclipse with an upgraded turbo and i love it!
i promised myself that i would never buy a non-turbo car ever (and im buying an xB soon)
but that engine can handle the power. the 1.5L was meant to be an econo-box powerplant
and not to break 9's going down the 1/4 mile.

With turbo you have Wastegates to worry about holding the psi down to a moderate level
you need to replace the headers with an exahust manifold and turbo and a new downpipe
to line up with the exhaust. if your going with a custom kit be careful who your getting it with because i've had friends with one off kits and since they arent made in large
numbers sometimes the person/company making them doesnt really know how it
should be done. But with a s/c its just attach the belt and mount the charger and your
pretty much done.(i could be wrong i've never installed a s/c in an xB) and since its
belt driven that itself limits the amount of air its pushing into the engine. you have
to change the pulleys to feed it more air so its kind of a safety cap to not blow your
engine.

One thing the I will give turbos are the BOV...oh man that is the best!!!!

if i ever decide that its worth dropping $3500 or so for an extra 25hp into
the xB then i'd go with something a bit more reliable which IMO is the s/c.


btw, whats this about turning off the s/c??!?!? i've never heard of that being done?
is this actually possible on the blitz? does it disengage the turbine from the
shaft or something? how does that work?!!?

 

When you get into the $3500 range, aren't you almost at engine-swap terrority?

 

yeah I think you are...but thats for Honda's....
im not sure about Toyota motors...

it would be crazy fun to have the 1.8 Celica engine in the xB tho!
no that i would get stick!

 

It wouldn't be too big if you put it in the back.....