Smoke during deceleration
 

Hi,
I noticed while I was at the track yesterday that when I am decelerating after the traps that I see smoke from my exhaust. There is no smoke when accelerating.
My setup consists of:
Ls/Vtec
newly rebuilt T3 from Blaast with 1/16" oil restrictor
Dsm 450's
Crome,tuning to 11.5:1 afrs
Injector battery offset set to 450's
I don't know if this could be a mechanical problem or a tuning problem. I am tuning myself. I was thinking maybe it was from running rich but I thought that it should go lean when letting off the gas.
Anyone have this problem before??
Oh yeah, I am running a 2.5" exhaust, no cat, glasspack then Dynomax.

Re: Smoke during deceleration
 

what color smoke??
i would say if its blue, that your valve guides are goin

Re: Smoke during deceleration
 

The engine was completely rebuilt and broken in before it saw any boost.
I replaced the valve seals before bolting on the head.
I have a cometic mls headgasket with arp head studs.
The smoke looks like a grayish color, meaning that it is running rich(?), but Its hard to watch the smoke and try to slow down after going through the traps.
I am wondering if it is because I don't have a catch can, but I did reroute the pcv valve signal line to pre-turbo as opposed to the intake plenum.

Re: Smoke during deceleration
 

I wouldn't hook the PCV straight to the pre-turbo intake because you'll just suck in oil vapor and increase your chance of detonation.

When you're decelerating under high vaccuum, you aren't using any fuel at all. I doubt that it's a tuning problem.

Take off your turbo intake/downpipe and inspect for oil. Even if it's a recent rebuild it's worth looking at.

Re: Smoke during deceleration
 

If I did find oil in my downpipe, what could be the cause? (puking turbo oil seals?) I figured it wasn't from running rich, but the smoke did look a grayish color.

Re: Smoke during deceleration
 

Oil in the downpipe means that oil has made it's way past the seal on the turbine side, and most likely needs replacing.

Re: Smoke during deceleration
 

How about the oiil drain? If it isn't routed steep enough, what would be the ramifications?

Re: Smoke during deceleration
 

Same, oil pushing past the seals. It needs to go somewhere if it can't drain fast enough and that's the next place to go.

Re: Smoke during deceleration
 

do you have a oil restrictor, of not the put one in. problem solved

Re: Smoke during deceleration
 

READ.

1/16 oil restrictor installed.