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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 05-05-2014, 09:25 AM
JKenshi JKenshi is offline
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Fuel Economy after VANOS seals

Ok, while I'm still chasing mysteries, let me ask a pointed question about fuel economy...

How soon after replacing your VANOS seals should you expect to see an improvement in fuel economy? I replaced mine this weekend, and I can certainly feel an improvement in the low end power. However, normal driving was getting me 18.1 mpg based on the instrument cluster reading, and after resetting it, I'm still getting 18.1. I'll be taking it out this weekend for a run to see if the highway mpg improves.

I've read some posts in other forums that fuel use issues can be other things beyond the vanos problem... I'm just trying to run this down a little bit. No codes showing, and no trouble lights. 82K on the odo.

Is there a break in time on new seals, or should I just not trust the instrument cluster?

thanks!
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  #2  
Old 05-05-2014, 09:32 AM
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bimmer765 bimmer765 is online now
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What engine is it?

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  #3  
Old 05-05-2014, 09:42 AM
JKenshi JKenshi is offline
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Originally Posted by bimmer765 View Post
What engine is it?

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Man, I suck with getting all the information out today. M54 I believe... '03 330xi.
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Notches on my 330xi Belt:
Expansion Tank Replacement, DISA Valve upgrade, Headlight Washer Nozzles, Front Control Arms/Bushings/Ball Joints, Sway Bar End Links, Coolant System overhaul, Final Stage Resistor replacement, Valve Cover Gasket, Vanos Seals.

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  #4  
Old 05-05-2014, 10:00 AM
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MalibuMafiaV MalibuMafiaV is offline
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Originally Posted by JKenshi View Post
Man, I suck with getting all the information out today. M54 I believe... '03 330xi.
Yes you have a M54B30. Before I had my SC on my 3-series it was getting about 18-21 city. And 28-32 hwy.
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Old 05-05-2014, 10:05 AM
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VANOS rebuilds generally give smoother idling, and restored low-end torque....I don`t think they have a whole lot of effect on fuel mileage.
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  #6  
Old 05-05-2014, 10:06 AM
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  #7  
Old 05-05-2014, 12:59 PM
JKenshi JKenshi is offline
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Originally Posted by Fast Bob View Post
VANOS rebuilds generally give smoother idling, and restored low-end torque....I don`t think they have a whole lot of effect on fuel mileage.
Beisan Systems lists increased fuel consumption as a symptom of vanos failure, and decreased consumption of fuel as a benefit for replacing the seals in their install instructions. I'm certainly happy I did the job (because those seals had plasticated really badly), but I was hoping to see the bump in the mpg's. Oh well...
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Notches on my 330xi Belt:
Expansion Tank Replacement, DISA Valve upgrade, Headlight Washer Nozzles, Front Control Arms/Bushings/Ball Joints, Sway Bar End Links, Coolant System overhaul, Final Stage Resistor replacement, Valve Cover Gasket, Vanos Seals.

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  #8  
Old 05-05-2014, 03:28 PM
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Quote:
Originally Posted by JKenshi View Post
Beisan Systems lists increased fuel consumption as a symptom of vanos failure, and decreased consumption of fuel as a benefit for replacing the seals in their install instructions. I'm certainly happy I did the job (because those seals had plasticated really badly), but I was hoping to see the bump in the mpg's. Oh well...
Naaahhh....gotta disagree with the Beisan analysis, mainly because the seals fail SO gradually, the difference is pretty small, mileage-wise....
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  #9  
Old 05-16-2014, 12:57 PM
JKenshi JKenshi is offline
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Naaahhh....gotta disagree with the Beisan analysis, mainly because the seals fail SO gradually, the difference is pretty small, mileage-wise....
Bob, I just wanted to follow up with this since my seals have had time to break in a bit...

After an email conversation with the folks over at Beisan, they said a break in time of 200 city miles would be normal. It's hard for me to guage the effectiveness, since traffic has been especially crappy lately, but there is a definite (though small) uptick in the mileage. I'm not willing to argue about it, as it could just be an abberation.

However, what is really incredible is the difference now in the idle, and the low end excelleration... even the mysterious wub is drastically diminished and getting better. It seems like every time I start the car it's better than it was the last time. I was expecting some improvement, but this is much more than I could have hoped for!
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Notches on my 330xi Belt:
Expansion Tank Replacement, DISA Valve upgrade, Headlight Washer Nozzles, Front Control Arms/Bushings/Ball Joints, Sway Bar End Links, Coolant System overhaul, Final Stage Resistor replacement, Valve Cover Gasket, Vanos Seals.

Upcoming Projects:
New Shocks/Springs
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  #10  
Old 05-16-2014, 01:05 PM
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Quote:
Originally Posted by JKenshi View Post
Bob, I just wanted to follow up with this since my seals have had time to break in a bit...

After an email conversation with the folks over at Beisan, they said a break in time of 200 city miles would be normal. It's hard for me to guage the effectiveness, since traffic has been especially crappy lately, but there is a definite (though small) uptick in the mileage. I'm not willing to argue about it, as it could just be an abberation.

However, what is really incredible is the difference now in the idle, and the low end excelleration... even the mysterious wub is drastically diminished and getting better. It seems like every time I start the car it's better than it was the last time. I was expecting some improvement, but this is much more than I could have hoped for!
Outstanding !

The main reason I say any mileage increase is irrelevant, is because the overall improvement in performance encourages your right foot to be a bit more aggressive....
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