Smoke during deceleration
06-21-2007, 10:39 AM
#1
1.5 BAR
Thread Starter
Join Date: Jul 2005
Posts: 1,069
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.
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.
06-21-2007, 10:58 AM
#3
1.5 BAR
Thread Starter
Join Date: Jul 2005
Posts: 1,069
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.
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.
06-21-2007, 11:06 AM
#4
Guest
Posts: n/a
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.
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.
06-21-2007, 11:31 AM
#5
1.5 BAR
Thread Starter
Join Date: Jul 2005
Posts: 1,069
Re: Smoke during deceleration
Originally Posted by jagojon3
Take off your turbo intake/downpipe and inspect for oil. Even if it's a recent rebuild it's worth looking at.
