RX-7FCS5

iTrader: (3)

Well it's me again, just trying to find more ways to spend my hard earned dollars, well anyways, I have a 1991 S5 turbo and I was wondering, if I wanted more power out of the turbo what I can do? Or what kind of turbos I can swap it out for? And help would be highly appreciated!

misterstyx69

iTrader: (142)

bnrsupercars.com can make you a hybrid,(but see below)That is the easy way as they will plug and play.After that you get into Manifold swap,turbo,injectors,Standalone,exhaust mod,etc..MONEY,Period.
.. you just can't slap a turbo on and think everything is going to be OK.You need fuel and some way to manage it,so it's not a simple "take this off and put this on" deal.

RX-7FCS5

iTrader: (3)

So really I should work my way up to the turbo? All the intake, exhaust ect..

misterstyx69

iTrader: (142)

Well if you get a free flowing exhaust then you have to port the wastgate and get a fuel cut defender..the list just keeps on piling up.
How you want to have your car is up to you really,so I can sit here all day and give you tips,but it would not accomplish anything.
Your best bet is to start looking at other Guy's cars on here.See what they are doing/Did to their car.Read the Sec Gen Specific section and the Archives and get some "knowledge' of what the stuff will do If you do this or that to the engine.
I had No clue when I got my N/A Rx7.I started with this website and a Haynes manual.Now I got a 400 hp TII.Same car too!, just Swapped stuff...a bit..lol!

Schnuh330

Is this car your daily driver? Will you be upgrading little by little or amassing parts and doing it all at once?

If you are upgrading as you go be sure to start with engine management first, next increase your fuel system's capacity(bigger pump and injectors), then work on increasing airflow (intake, exhaust, ic, porting), and finally upgrade the turbo. With this order you get control first, greater fuel capacity second so you can then increase the airflow without running lean and provide more flow to make sure when you upgrade the turbo it will spool up quickly, somewhere along the you may need to upgrade your cooling system(bigger radiator, high flow water pump, thermostat) I said may because I haven't worked on a turbo rotary yet but I do have experience with turbos.

Take your time and plan ahead. Upgrading a turbocharged engine is like chaos theory's application to time travel "change one thing and it changes everything." If you don't have any way to control the effects of the changes you make you can ruin your engine very quickly.

Like styx said read up on what others have done in the past, and start building a plan from there. once you get an idea of how to get the results you want, you'll have an easier time deciding on a budget, how far you want to take it and which setup will best work for you.

RX-7FCS5

iTrader: (3)

Thanks for the info guys, I really just trying to get general ideas on what to do with my car, right now it's sitting I'm my garage on jack stands with the front end stripped right off it, the engines only bolted in, the tranny isn't even and so it's my project to do all that, I chose it as my project to connect the entire engine and I also thought while doing that would be a good time to start looking into aftermarket parts for it and the right way to start swapping out the parts, so yea, once again thanks for all the info guys! Every bit helps!!

RX-7FCS5

iTrader: (3)

Just another question along the turbo lines, what kind of bypass valve does the S5 TII have? Actuator type or waste gate type?

RotaryRocket88

iTrader: (7)

Are you asking about blow off valves or wastegates?

Bypass valve (aka blow-off valve): Recirculates pressurized air from after the turbo to pre-turbo after letting off the throttle.

The internal wastegate on the stock turbo and most aftermarket is controlled by a pressure-driven actuator connected to an intake port.