white residue in turbo exhaust

[bozosoku]

I removed my turbo the other day and noticed the exhaust side is covered by a layer of white ash residue, it can be removed brushing hard with a wire brush, i wonder what that is ?? The inlet to the turbine is also covered in white so I do not believe it comes from a leaking turbo seal. The engine does not blow smoke more than normal exhaust, and my wide band shows it never runs lean. I don't remember it being this white the last time I took it out. Does it indicate the engine has a problem ? thanks for any input.

 

[TurboFreak]

Race Gas.

I dunno but race gas produces that kind of white residue.

 

[bozosoku]

premium 93 octane is all I used, maybe winter formula ??

 

[lewis15498]

Does your engine have a coke problem? lol
I've seen this before but i dont know what it means.

 

[bluemk3]

this is normal with high octane fuel i use 94 and mine looks like that also my pap has a 68 amx 390 4spd and he runs 110 jet fuel and his exhaust TIPS even turned silver/white

 

[4U2QUIK]

Seems pretty common. I've notice this on a few of my turbo vehicles.

 

[Poodles]

Race gas does it because it's leaded (it's the lead coating the parts).

On the turbo I think it's the temps it reaches...