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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > What's this coming out of my tailpipes ? Smoke ? Water ?



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      06-26-2012, 04:19 PM   #1
cstavaru
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What's this coming out of my tailpipes ? Smoke ? Water ?

Hi,

A strange thing happened when I participated at a drag racing event a few days ago (best 12.4s with 2.0 60ft and 118mph trap speed - full weight and half a tank of 94 octane fuel). When doing a burnout, something came out of my tailpipes, or maybe around them, I am not sure. The thing is that it just lasted for like 1 second, and then it suddenly disappeared.

Two things happened that could cause this: a guy used a bottle of water to pour water on my tires before the burnout, and also I have a habit to stab the throttle a few times before reaching the burnout area (in order to cool the intake charge), with methanol reaching full flow during this time. I have the HFS-4 meth set in on-off mode, with a very low triggering point, basically you can trigger it if you go wot while the car is standing still. So I am thinking that it can either be water from the tailpipes (I am using 60/40 mix) or water from the tires.

Here is the video:



...
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      06-26-2012, 04:24 PM   #2
Lulz_M3
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That is quite a bit of water coming from the exhuast... never seen that before.
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      06-26-2012, 04:26 PM   #3
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You still got cats?
Water is a normal byproduct of the catalytic converter changing CO to CO2 especially if you've been idling for a while before the race.
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      06-26-2012, 04:27 PM   #4
cstavaru
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Quote:
Originally Posted by Andrey@AutoCouture View Post
You still got cats?
Water is a normal byproduct of the catalytic converter changing CO to CO2 especially if you've been idling for a while before the race.
No cats, unfortunately.
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      06-26-2012, 04:27 PM   #5
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It is water from the combustion.
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      06-26-2012, 04:29 PM   #6
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Quote:
Originally Posted by cstavaru View Post
No cats, unfortunately.
Could be condensation.
If that much methanol went through the engine you'd hydrolock it
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      06-26-2012, 04:32 PM   #7
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You probably had water in the mufflers.
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      06-26-2012, 05:40 PM   #8
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Quote:
Originally Posted by NiVeDh View Post
You probably had water in the mufflers.
Yeah...that's what I'm thinking too. Just purging condensed water sitting in the muffler.

But I think he is running dual 1.2mm nozzles also?
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