Brown Smoke On Boost

[armbrusb]

I have an R32 GTS4 with an RB20DET w a VG30 turbo exhaust intercooler - chipped computer and Apexi SAFC.

When I peg the car and it comes on boost (about 4,500) I get a cloud of brown smoke. What is this - I thought that black / grey would be fuel and blue would be busted rings - but brown???

[race_snooze]

brown is that not coolent being burnt?? hope not...

[armbrusb]

How would that work - leaky head gasket or somehow coolant in the turbo?

[James Mramor]

No i don't think that this can have anything to do with your headgasket... head gaskets blow white smoke.... or the make steam!

Check your timing and your fuel mixture... anything from gray to black is USUALLY related to running rich and your timing is firing early (or your timing is retarded, not stupid but made to fire early) Brown fits the disctiption of really early detonation.

go to your local skyline shop (in canada no one knows what to do with a RHD car so they freeze that is why i say skyline shop) and get that checked out.

post again let me know what happends

[ish]

Chill .... its just exhaust dust left over in the exhaust ... happens when a car is driven like a baby for a long time or let sit ......

[The Mafia]

chocolate brown usually means a near perfect AFR?

Black is rich...

[gtst4d]

Put it on a dyno for a quick check should only cost about 50-60 bucks that way you know what is realy happening.

[RBFIRE]

my car does the same,

because i just installed the boost controller,

and when it on boost, alot of black or brownish cloud of smoke, and smell of fuel,

I thought it could be O2 sensor.

Most probly its runing rich.

Off topic: is after market boost controller is illegal?

i got defect for it?

now I know, I gona hide it now.

[RANDY]

Of course an aftermarket boost controller is illegal! =-p

So are ECU's, pod-filters etc. =-]

[Abo Bob]

I've never SEEN brown smoke out of my exhaust but I have seen the exhaust turn brown when I know it was running very lean.