Vacuum Problem

[boostjunkie333]

Ok, I gotta crazy problem for you guys to help me solve...

When I make full boost...sometimes, if not driven an exact way, a cloud of black smoke will pour out of my muffler...like...not like when you have a bad a/f ratio...i mean its like, one of those secret agent cars...I hit full boost and a smoke cloud runs out...

When it happens, i'm usually at full boost like I say, and and it makes a bogging noise, like I can feel my car bog down, but its not a jumpy bog, its like, a constant smooth less power bog, just for a few moments, and when I let off the gas, it stops of coarse.

I asked questions, talked to different folks that sold the parts I have. Even talked to this local "eclipse guru" apparently(old guy which has a local track record, running a rs) and he said It may be the vacuum pulling so hard its sucking oil through the pcv valve, or something another...or maybe I heard him wrong. Either way, hows the oil getting out?

Like I said, this is only sometimes...like, when im driving down a road, and shift down, and give it hell. It sometimes does this. Usually from a dead standstill though, maxing out the boost wont make it do it.



Any ideas?

[Blackcrow64]

Check the turbo for shaft play. Sounds like something along those lines to me...

[SilvrEclipse]

Check the turbo shaft play, oil drain for blockages, check your intercooler to see if there is oil in the bottom. I think what your friend was saying is your PCV valve is leaking when the manifold sees boost pressure. This will cause your crankcase to pressureize and could blow oil by the rings. My car does is occationally but it only blows the dipstick up a little so I doubt this is your problem.

Im betting on a fuel problem, running to rich under boost. Do you have a wideband gauge to show your not? You said your not running rich but how do you know this.

[boostjunkie333]

Oh I have no doubt in my mind the tuning is lets say a wee bit off...

Which is why im trying desperately to get my laptop to work to tune it up...

I was just trying to pinpoint the problem...if I tune it, and it still does the same thing, ill let ya guys know and we can go from there, appreciate the answers!!

[SilvrEclipse]

Yea that would be your best place to start. You still didn't answer my question about the wideband. Do you have one and if not how do you plan on tuning that car?

[boostjunkie333]

sure dont...

I guess I need one...

Cant be done without it right?

Little boogers are expensive, hafta save up a paycheck or two to get one.

Also, im not sure if my o2 sensor is wideband...when i bought the car, it had the exhaust piping already on it...

[SilvrEclipse]

Yea I doubt you have one then. And yes you have to have one in order to do any tuning. Or you can take it to a dyno and have then tune it with their WB.

[david-b]

However with the price of dyno time with WB tuning, it'll be cheaper to buy one and do some basic tuning yourself.

[TheBobsHere]

Learning to tune from scratch with boost can make for some very expensive mistakes lol.

[boostjunkie333]

Originally Posted by TheBobsHere

Learning to tune from scratch with boost can make for some very expensive mistakes lol.

go on....lol

[TheBobsHere]

When it comes to boost it only takes a little detonation to turn pistons into conversation pieces. I've seen everything from broken ring lands to pistons that practically exploded into BB's from too much timing, not enough fuel or both. Poor tuning and boost are not friends. You really need a wideband and data logger before you can really understand what your PCM/engine's doing. I like the PLX wideband, they do have a data logger but since I use the TwEECer to data log I've never needed to use it. I'd do the checks recommended above tho.
By the way, what do you mean by drive a special way?

[SilvrEclipse]

Tuning is a little risky but as long as you take it slow and dont rush it you will be ok. Also your not starting from stratch since you are already boosting the car and its running. So you need to just do some logs over the entire boost portion of the map and adjust your fuel controller accordingly. Since you are on the stock timing maps you will have to be careful when boosting above 15psi. I recomend that you make some det cans to help you hear detonation. I tune with those and a WB and never have any issues.

[boostjunkie333]

Awesome awesome, this is the exact info ive been searching so long for, thanks so much...


but um, by drive it a special way, i mean, if i start off from a dead standstill and accelerate hard under boost, it doesnt do it(burn oil) but it seems it only does it when im cruising steadily, and downshift, and hit it...

thats what that meant, sorry


so, let me make a check list of things i need, and you can tell me if im on the right track...

-wide band 02 sensor
-data logger
-wide band gauge
-det can


heres a link to the gauge i wanna get, if any of you are bored and wanna see it lol...

http://www.glowshiftdirect.com/Black...uel-Gauge.aspx

also, anyone recommend a good company for 02 sensors? an possibly, a link to an install thread? if thatsnot asking too much.....

if it is, you can kick me

[TheBobsHere]

Assuming its running rich (black smoke instead of blue gray) it cant have a very good tune if its blowing that much smoke, to me that's starting from scratch. Also, Det cans do work but they can also be a risky way to go as they depend on your ears and reaction time to save the engine from damage. Right now I'm saving for the J&S system because it doesn't depend on my fu*cked up hearing to prevent damage and it retards the timing automatically allowing me to keep my foot where it belongs, firmly on the floor.
Power cost $$$, you need to pay to play. Bosch is my personal suggestion for wideband o2 sensors.

[SilvrEclipse]

The det cans work amazingly well. The only issue with them is that your not monitoring knock all the time. Since your on your stock ECU if you knock it will pull timing. On a standalone system, i.e. MSnS you probably dont have a knock sensor hooked up so I just pull another degree of timing to be on the safe side.