Aftermarket Exhaust = Melted Stock Turbo?

[Slider15]

Hi,

I have been told on a couple of occassions that because the RB20 runs a ceramic turbo that if you run an aftermarket exhaust on the car (i am only looking to do a cat back) that the turbo will run too hot and eventually melt.

True or False?

[Nismo_line]

Ive been running my hks exhaust for 2 years now with the boost turned up little bit on stock turbo and its fine.

[steveo1502]

Yeah, not sure why someone would say that, aftermarket exhaust would b more open and free flowing, more restriction would make it hotter

[Daryl @ RightDrive]

False. People come up with the weirdest stuff.

[Xeno-Vibe]

LOL that makes about as much sense as a stork delivering babies.

[Messiahlee]

Should be less restriction on turbos and better for them

[Slider15]

Well all that being said, any suggestions on moderately priced catbacks?

[RixR32]

Where in ONT are you?
Yes a free-er flowing exhaust will lower exhaust temps. Running higher BOOST on stock turbo has been known to blow off the ceramic exhaust wheel though. The PSI this happens is debatable. Most say 12-14 PSI is max.

If you are still looking, I have an Apexi 3" stainless Catback that the wife wants OUT OF THE GARAGE! lol
It even has a welded bung for the OEM temp sensor so you can run a decat pipe and swap for etests...
$200 or MAKE AN OFFER...:-)

[Skym]

It won't melt turbo. If catylitoc convertor is restricted and ECU pulls ignition timing, runs engine rich, exhaust temps can reach 800+ degrees C, which via sensor in exhaust, switches the cat overheat light on (dash).

From what I understand, aftermarket exhaust = less restriction which makes exhaust gas exit turbo quicker and exhaust wheel, compressor wheel go faster (rpm) which produces more boost on compressor side of turbo. More boost vs same amount of fuel being injected by ECU = leaner A/F (Air to Fuel) ratio which makes engine produce more hp. If fully derestrict exhaust from turbo with 3" exhaust, roughly 0.3bar x 14.5psi = 4.35psi increase in boost level.

More psi = faster shaft speed on turbo. If turbo bearings on exhaust side of turbo don't get enough oil or bearing is worn out, it makes shaft, exhaust wheel go off balance. When off balance and at higher boost level, the exhaust wheel hits exhaust housing which snaps shaft and ceramic exhaust wheel goes down exhaust (usually find ceramic exhaust wheel in middle of exhaust). The psi exhaust wheel will fail at depends on how out of balance turbo is.

From what I understand, hot oiltemps create coking / dried up oil deposits which block oilways to bearings and can happen with thrashing + shutting down engine after thrashing before oiltemps drop to safe level. Or because of lack of engine oilcooler or engine oilcooler is not good enough, etc.