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Old 01-27-2005, 11:59 AM   #1
Shifty Eyes
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2004 Sold WRX Wagon
Now 07 GT Leg Pearl

Default Black smoke = good?

I was told by someone that if I dont have a little bit of black smoke coming out of my exhaust at high acceleration that i'm not getting enough fuel. My car hasn't been tuned to this ecutek yet, but the previous owner and I have the same exact mods; just different brand names (the same quality). The only thing that he doesn't have is an aftermarket BOV.

I dont see any "black smoke" during heavy acceleration. So is my car running lean? She's running like a champ at 12-14psi of boost. Is the only way to check this a dyno tune?

Mods

ecutek
hks upp
hks down p
hks hi power exhaust
AVO shorty intake
perrin manual bc (running pretty close to stock boost)
AVO bov

thanks guys
-trev
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Old 01-27-2005, 12:58 PM   #2
pezman04wrx
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I wish I were qualified to give a known comment on this, but all I can guess is that your friend has no idea what the hell he is saying ... I can't see any reason that under any circumstances that it could possibly be a good thing to see smoke of any color coming out your exhaust ... You have a turbo, not a turbo diesel ... Diesel's smoke, turbos only smoke when they've been destroyed ... Like I said though, I'm not an expert by any means, so please, someone correct me if I'm wrong, and I'll gladly learn ...
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Old 01-27-2005, 01:08 PM   #3
mbiker97
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Do you have any guages except for boost? I generally had some blackish smoke coming out of my exhuast during hard acceleration. It's not a rule that you have to have some though.
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Old 01-27-2005, 01:14 PM   #4
Shifty Eyes
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Default

Nope the only gauge that I have is boost. My car doesn't fart any smoke anytime, so I thought maybe my friend is right and I'm running her lean. I have another friend with a stage 4 rex and he's got black smoke coming out his exhaust on a hard acceleration, but hes also putting out around 300 ponies. He's got a laptop and he knows what his car is doing at all times so his car is healthy. So I dont know. God I hate being such a noob.
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Old 01-27-2005, 01:28 PM   #5
Tgui
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I think thats in reference to running rich. In general its safer to run on the rich side. When you run rich, a bit of smoke can be seen. At night though, you might also see flames.

-Eric-
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Old 01-27-2005, 01:29 PM   #6
TyrannosaurusRex
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well black smoke is better than white smoke
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Old 01-27-2005, 01:36 PM   #7
blackwrecks
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Black smoke is caused by running rich without any cats. Turbo cars need to run rich under boost (which would be experienced under heavy acceleration) to cool the combustion process and prevent detonation. Detonation is a preignition of the Fuel before spark that causes increased cylinder pressures causing heavy wear. It can eventually blow your engine if the detonation (KNOCK) is excessive.

I wouldn't be concerned if you don't see black smoke, as it is usually an indicator that you are running too rich, which could foul your spark plugs, especially if you're running plugs that are a step or two colder than stock. In any event, instead of relying on black smoke, your best bet is to buy some gauges and/or a Data logger to monitor your tune and do some research so you understand what you're looking at.

Since you have an ECUtek flash already, DeltaDash would be a good choice (it'll allow you to make minor adjustments to your tune as well). If you're going for gauges, get an EGT gauge and a knock monitor; maybe an AFR gauge if you got a spot to fill.

Last edited by blackwrecks; 01-27-2005 at 01:42 PM.
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Old 01-27-2005, 02:23 PM   #8
Shifty Eyes
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Default

cooll thanks guys
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Old 01-27-2005, 02:53 PM   #9
pezman04wrx
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Learn something new every day ... Thanks for the info as well ...
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Old 01-27-2005, 05:49 PM   #10
bboy
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Quote:
Originally Posted by TyrannosaurusRex
well black smoke is better than white smoke
perfect comment

Read a lot more, the day's of tail pipe reads and spark plug assessment are pretty much over. Ohhhhh, but brings back memories.

Once "drove" a car to a service station (these don't exist anymore either) by pouring gasoline in the carburator because the points were failing. Now, picture, how does one do this. Well it took two people: a brave one, and a wheel man.
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Old 01-27-2005, 09:44 PM   #11
engineerx
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Quote:
Originally Posted by bboy
perfect comment

Read a lot more, the day's of tail pipe reads and spark plug assessment are pretty much over. Ohhhhh, but brings back memories.

Once "drove" a car to a service station (these don't exist anymore either) by pouring gasoline in the carburator because the points were failing. Now, picture, how does one do this. Well it took two people: a brave one, and a wheel man.
LOL !!

I remember, sometimes my Toyota Corona wouldn't start I'd trickle some gas thru carb and that would do the trick!
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Old 01-28-2005, 01:28 PM   #12
Physics Junkie
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Black smoke = fuel
White smoke = coolant
Blue smoke = oh ****(oil)
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Old 01-28-2005, 07:45 PM   #13
wrxdrvr
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Well black smoke is better than white smoke Just because you don't see black smoke it doesn't mean it's bad, and just because you do it doesn't mean it's good.
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Old 01-29-2005, 03:58 PM   #14
erice1984
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black smoke - usually associated in completely OE cars is the driver of that car drives it really easy for a while then they floor it and big puff of black smoke comes out, carbon and a bunch of crap that builds up leaving the engine.
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Old 01-29-2005, 04:06 PM   #15
adeliciouspizza
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a wrx with catless exhaust, intake, bov and mbc should generally have a noticeable bit of black smoke under wot in my experience. although as others have said you cant really judge anything just by that (unless the smoke is white or blue, in which case youve got problems).
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