I'm trying to decide whether or not to put one in. I already have one, and i've asked someone whether or not I should; but I want to double check.

Here's some pics:

FCD:


Where it goes and intake:



I Bought the car with these mods:

Intake & K&N Filter
BOV: Brand Unknown
3'' Single downpipe with Cat and 5Zigen muffler
These probalby dont matter but: New Flywheel, stage 2 clutch, wheels and tires.

I'm running 10 psi, I've got a stock turbo, and I'm about to install a boost guage too.


I want to know if you guys think its safe for me to install the FCD.

Thanks!

 

bump

 

Then you already have a FCD somewhere, probably wired in at the ECU.
So how do you know you're running 10psi?

 

I tested it out to see if it worked, and it maxed out at 10 psi..

Another question/problem: At about 5-6000 rpm, my psi reading drops from 10 to 9.

I know its running higher than stock psi, but its because I have an exhaust. At least, thats what my brother tells me.

 

the reading of 9 as you approach redline is probably correct. The stock turbine simply cannot keep that much pressure at that RPM. You are going to have a slight drop in most cases on the stock turbo is you are boosting more than stock.

Your brother is correct, you are running higher than stock psi because of the exhaust and intake.

Running 10 psi I would say its not safe to run the car WITHOUT the FCD. You should have hit fuel cut by now...

 

You can't run over 8.6psi without an FCD, so he either has one or his gauge reads high.

 

Well, my brother says its not normal or okay that its dropping down..

He says its either because the CPU is limiting it, or it needs more fuel. (It should be able to run around 20 psi, he says).

Why do you think the FCD would make it safer?

 

Because without a fuel cut interupter you will hit fuel cut above 8.6psi.
This is bad.

 

I am so confused.. Why is this bad??

I'm running 10 psi without fuel cut. I was asking because someone told me if i hit 12-14 psi i could damage my turbo or engine.

 

Like has been said before already, if your actually running 10psi then you must already have a FCD, or worse, your boost sensor isn't working properly.

12-14 is where you will start running out of fuel and killing your turbo by over revving it.

Hitting any sort of fuel cut is baaad mmmkay, especially while under boost, also if im not mistaken fuel is only cut to the rear rotor not the front, this is also bad.

 

It is perfectly normal behaviour for the stock turbo on nearly every turbo'd car. If you think of a pump pushing water, as flow increases you have to push harder and harder to maintain the same pressure. When you reach a certain point the pump (or turbo)
can't push hard enough to do that, so the pressure begins to fall even though flow is still increasing.
The S5 does have electronic boost control, but it's not that sophisticated.
No, if it runs lean it actually runs better up to the point where detonation occurs. Then the engine goes pop...
Bollocks. Few stock turbos can push 20psi, and cetainly not ones from the 80's. Even if it did, it would be only briefly, as detonation would be certain.
It doesn't, it just avoids the fuel cut. In fact it allows you to push the boost to dangerous levels, so it should be used with caution.

 

RyoFC3S


In short what NZconvertable just posted is exactly what I told you and your brother. Are you happy with a second oppinion now? just about every point I tried to make with you and Jeremy he just reinforced.

Santiago

 

Well, my answer still hasn't been answered. Do I or do I not put in the FCD? :P

 

OK, but first tell us what you think an FCD does.

 

Oh, but the answer has been read by you several times I think.

So, you tell me whether you question has been answered. And just so you know, if your factory boost guage goes up pretty high, then the boost sensor works fine.

 

Aww you spoilt it fstrnyou i was waiting for him to reply to Evil Aviator first before i did that...

hehe.

 

AWW dam, i was doing all that while evil posted his thing. oh well, it's not his fault he's ignorant.

 

You can't be serious...

 

then again, maybe it is his fault. some people don't take the time to educate themselves and just spit off questions without doing any research.
and why the hell are these servers slow. i have to wait 3 minutes for my reply to go through

 

The answer is this if your gage is correct and you do hit 10 PSI while driving the car then NO because you have FCD already somewhere or your fuel cut is not working properly (I've never heard of the last one though). But if your gage lies and you are not hitting above 8.6 PSI then YES install FCD and replace the gage too. That is assuming that you tested the turbo by driving the car and mesuring the boost.

 

man i was too late

 

We need him to shift into active mode, guys. He isn't going to understand what is going on if he keeps waiting to be spoonfed. Once he answers my question, things will be more clear.

 

I am very aware of what a FCD does. I know what i'm doing.

I'm not an ******* idiot. I made this thread to make sure that I wasn't going to blow up my engine or turbo- so don't act like I did this because I was lazy. I already had an opinion. I was just double checking.

I'm glad you guys are so friendly.

 

DUDE! i'm sorry you quite obviously did/do NOT know what a FCD does!

If you were/are running 10PSI then you already have one. So, do you need another one? No.

 

You are missing the point here. We have no idea what you know and don't know, but it is obvious that you are not understanding what has been said in this thread. If you tell us what you think an FCD does, then we can understand where you are coming from, and can then help you. Simply stating that you know what it does is not an indication of your thought process. If you really knew what an FCD does, you wouldn't have asked the question in the first place, right? We are not idiots, either. Well, not completely idiots, anyway.

Simply stated: It doesn't matter how well you understand the FCD, just tell us what you think it does.