What kind of gains can I expect from this? The website says up to 60 horsepower or so, but I highly doubt it would be that high. Anyone have an estimate on the gains to the wheels?

 

There's no way in hell you searched, because someone just posted this same thing a week ago.

Anyway, the RB turbo back is the single biggest bolt on gain you're going to get. I would 100% believe that 59 hp gain they advertised on a brand new car back in the late 80's, or at least on a brand new engine. Just remember that you do NOT run that exhaust without an FCD, or you will unleash the gates of rebuild hell.

 

Well alright, thanks! When I get it I'll pick up an FCD from them too.

 

Do me a favor. Take the car out the day you get the exhaust, and floor it.

Then, go home, let the exhaust cool (of course), swap it out (it will take you anywhere from 2 to 5 hours, just because of the damn connective rust), put on your FCD, then go out and floor it.

Then, come back and tell us whether or not you got 59 horsepower. It will feel like a completely different car.

 

What does a fcd do?

 

Fuel Cut Defence

Keeps the ECU from cutting fuel to the rear rotor above pre-set psi. (6 or 8?)

http://www.racingbeat.com/FRmazda2.htm

 

Yes, it is that high.


-Ted

 

sorry guys for the dumb question but will i have a problem with this fcd if im already running haltech?

 

No.
FCD is required if you're running the stock ECU.


-Ted

 

A FCD is not enough, you will experience massive boost creep on a stock wastegate (kaboom engine) and even if you properly port it to saaaaaaaaaaaay 10psi max you are still pushing the stock injectors (which are probably not performing at 100%) and then engine kaboom....again.

That's my current setup

Went from a totally stock rebuilt S4 TII block to
1) Full RB Turbo Back
2) GSL-SE Injectors (secondary)
3) FCD
4) Ported Wastegate (10psi)

I dont know if it's 60 horsies but it will leave my GXL DD in the dust.

 

well right now im underboosted cause i still dont have a boost controller so im only boosting 4psi. it has a mild street port and there are very few things on it that are stock. will i be fine running my revtII cause its sitting in my living room. i just ordered the hangers from fb yesterday and they are coming tomorrow!

 

So upgrade the injectors with the exhaust and FCD? Which injectors should I get, and, sorry for being such a noob, but how does one port the wastegate? I'd just like to do this right.

 

I was not the one who built my engine, since I'm not much more knowledgeable than you.

I took my car to a shop to have bigger secondary injectors installed. I believed he said they would be the pair of larger injectors from a first gen 13B (I think the 13B in the GSL-SE only has two injectors, instead of the pair of primary\secondary injectors in the 13B's found in FCs). They will stop the engine from leaning out at high boost\RPM (otherwise engine kaboom).

The stock turbo wastegate will work properly for stock boost levels (~6psi on a stock S4 motor) but needs to be ported (made bigger) for higher boost levels. You can find details on this on rotary resurrection's website.

-R

 

If you upgrade the secondaries you should buy a fuel controller.

OR

just buy a Rtek 1.5.

 

upgrading to 3" exhaust on TIIs is kind of a pain in the ***, because you cant just do that upgrade alone and expect no problems.. you pretty much have to do all the things syncro laid out, or expect to be doing rebuilds quite often

 

As soon as you install the RB exhaust on your car, you will be boosted big time.
At this point I strongly recommend you install a Fuel Cut Defense from Racing Beat
as well as some bigger secondary injectors like the GSL-SE injectors or you can go with 720's in the secondaries as well, but if you go that route you will need to install the resistor to make them work properly. Also you will need a fuel controler as well to properly control those 720's. I would also rewire the stock fuel pump for better voltage to the fuel pump. A popular upgrade is the Walboro or FD fuel pump. You should also install a boost gauge if you already havent done so, in order to monitor your boost pressure. You dont want to boost more than 10 or 11 psi with that setup that I mentioned or you will be blowing motors left and right.
A lot of people on this forum will disagree and tell you that you can run 14 psi all day long, and nothing will happen. The answer to that is "yes" you can do so, but for a short period of time before you either blow the motor from running lean due to hot intake temps caused by the stock intercooler, or spiking to much boost and leaning out. Just to let you know once you start boosting more than 10 or 11 psi you are out of the efficiency range of the stock turbo. In plane english you will not make more horespower boosting 14 psi or more on the stock turbo. After repeated abuse the stock turbo oil seals will go due to over boosting. and then you will need a rebuild. Do a search under my name, and you will see that this subject has been brought up before. Also before I forget a FMIC upgrade would be nice to deter those hot intake temps.

 

Thanks for the info! That's exactly what I needed to know.