If I were to put in a 3" turboback exhaust and have no need/desire to run more than stock boost....I would think that an FCD would not be required.

Is that correct?

I just want to increase reliability and NOT blow my engine.



(bone stock S5 TII)

 

Unless you have a boost controller you will be running more than stock boost with a 3" turboback exaust.

 

but the fuel cut should stop me from running more than stock boost

only problem I can see is that full boost kicks in at like 5000rpm & will limit me from using the entire power band

 

You dont want to hit fuel cut. fuel cut bad. FUEL CUT BBBAAAAADDD.

 

just get the fcd....
they are cheap and easy to put in....
they are worth it

 

if I get the FCD, there will be potential to lean out & detonate

why is the FCD bad???

 

yes there is the potential to lean out and detonate....you car wont cut fuel anymore, but it also wont be able to compensate the extra boost with the extra fuel needed unless you get a different fuel pump and injectors

 

It depends on the exhaust system, and how you drive the car. I don't care what mods you put on your car, I bet you that I could drive it around town without boosting past 2 psi.

Boost conrtollers can only increase the boost level, not lower it.

 

Didn't know that.

 

but can't you get a boost controller that you can set at 8.5?

 

the fact is, the stock WG doesn't flow enough to limit the boost with that exhaust. If you had an external WG you could keep the boost anywhere you wanted, but the stock internal one gets overwhelmed easily.

 

so if you port the waste gate you can probably have free flowing exhaust without having to crazily mod your fuel system?

 

if you up the boost, you are going to have to mod the fuel system sooner or later, but if you port the WG, you can get a boost controller and keep the boost down without creeping and without upgrading fuel.

 

awesome