25 psi is also a prob for the smaller R5 turbos as they have tiny !!!!y turbos, crap intercoolers and tiny engines! but the power they make from these presures is rubish.. like about 240bhp!
my car run 24.6psi and makes 411bhp and 404ft/lbs
engouth blowing of my trumpet...
turbos are not the best thing in the world for day to day use. they need to be looked after by cooling down the oil after use and the exhaust side of the turbo will heat up the other half too. also the under bonnet temps are pushed up by this.
also you should change the oil in the engine every 3000miles or less and change the filter at the same time.
the gain from a turbo is that they are much better at higher revs than superchargers and can develope more peek power.
superchargers however do have their own advantages and more so when adding one to an NA car.
the supercharger will work from the first rev of the engine where as the turbo wont make any power till 2 or 3k revs. the turbo will go on much longer than the supercharger to the peek revs so you dont lose power at the top (wher superchargers become less efficent and the power will tail off)
turbos can also stall if they are not setup correctly. superchargers dont have this problem as they are mechancaly driven by the engine. but this drive does sap some power away from the engine as its used to power the supercharger.. this is where turbos win in the power race as they only use waste gases to power their compressor.
both types of compression are good in their own way. if you are going to fit one or the other to your car and its currently NA then i would surgest that you get a supercharger as they are MUCH less work to fit than a turbo.
no need for ...
new exhaust manifold
oil and water lines for cooling of turbo
and you have to match your turbo very closely to the cam and rev range of the engine
a super charger is much simpler to stick on but you will get less power for you mod.. but the mods are much easier to carry out and will cost much less than a turbo.
be warned tho. in both cases you can get DET and this can and does melt pistons in just a few seconds! if you are looking for good power gains then its a good idea to protect your investment with some forged pistons too! and you will need extra fueling and colder spark pulgs.. not to mention oil coolers, intercoolers, metal head gaskets, valve seats or maybe even the valevs too.. and then you need springs, retainers, guides etc etc etc...
fuling is the key point on boosted cars, get it wrong and its a blown engine. but get it right and your sping your front wheels all day long (its a 147 right?).
you should really get larger injectors or at the very least an up rated fuel pump and fuel presure regulator.
if your getting the kit from a profesional company they should have thought about all of this. if you dont want a full engine rebuild then you cant get that much power from the kits. simple as that. 200bhp maybe but i wouldnt push your luck too far as boosted cars go pop a lot more than NA ones. (take it from a man who has had his share of engine rebuilds!!!)
dont worry about 34psi R5 turbos. they cant get the power down as their wheels just spin all the time and even then they they are not making that much power and it'll prolly go pop before they finish racing you
good luck and welcome to the land of the boosted
oh and for some real good fun, get a turbo with anti lag, i did and i cant help myself now!
0-60 3.24, 411bhp, 404ft/lbs, 4 wheel drive all in a pulsar.
all go and no show