[Glowin]

Anyone know? I've now had TWO N54 engine cars, both Cobb tuned, have their water pumps crap out, in fairly early mileage I'd say.

First, my 2008 335 with only 35,000 miles on it, which is Stage 2+ and has been Cobb tuned for the last 20,000 miles (and before that, 10,000 were on a Procede stage 1).

And now, my 2010 535, which has 50,000 miles on it (the last 30,000 of which have been Cobb stage 1 tuned).

I thought they usually last up to at least 70 or 80,000 miles? WTF?

I know some tunes, like the Dinan flash, turn up the water pump's speed to assist in cooling, and perhaps that leads to premature deaths on these things?

Here's Dinan's quote:

Remapped Water Pump Speeds To Control Engine Temperatures The N54 engine is known to run a little warm in stock form. In an effort to more effectively control oil and water temperatures, the Dinan software actually increases water pump speeds as boost pressure increases.

http://www.dinancars.com/product/d90...-z4-xdrive35i/
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Anyone know if Cobb does it too? Though you wonder how much impact it would have even if it works like Dinan's, since it's supposed to be only with increased boost, and with mainly city driving, it's not like you're in 15 PSI of boost all the time...

[Jklad]

Cobb does not

[Boosted_N54]

Originally Posted by Glowin

Anyone know? I've now had TWO N54 engine cars, both Cobb tuned, have their water pumps crap out, in fairly early mileage I'd say.

First, my 2008 335 with only 35,000 miles on it, which is Stage 2+ and has been Cobb tuned for the last 20,000 miles (and before that, 10,000 were on a Procede stage 1).

And now, my 2010 535, which has 50,000 miles on it (the last 30,000 of which have been Cobb stage 1 tuned).

I thought they usually last up to at least 70 or 80,000 miles? WTF?

I know some tunes, like the Dinan flash, turn up the water pump's speed to assist in cooling, and perhaps that leads to premature deaths on these things?

Here's Dinan's quote:

Remapped Water Pump Speeds To Control Engine Temperatures The N54 engine is known to run a little warm in stock form. In an effort to more effectively control oil and water temperatures, the Dinan software actually increases water pump speeds as boost pressure increases.

http://www.dinancars.com/product/d90...-z4-xdrive35i/
.
.
.
Anyone know if Cobb does it too? Though you wonder how much impact it would have even if it works like Dinan's, since it's supposed to be only with increased boost, and with mainly city driving, it's not like you're in 15 PSI of boost all the time...

both you and i my friend. I also wonder this if cobb has anything to do with it , my first time i changed my water pump was back in 2011 were my fan start spooling up like crazy. and now i have a big coolant leak and its from the water pump and i have to change it all again.

[gingerbreadman]

This can't be a coincidence. My water pump crapped out too at about 50k on the odometer within a month on stg 2+.

[JStang]

There are many people who are not tuned who have had their water pumps go around the same mileage as you guys. I ran my Cobb tune for almost 45k miles before it finally went out at around 82k miles.

Luck of the draw.

[AWD Addict]

My waterpump shit the bed before I had the tune on.

[ferocity02]

My pump took a dump at ~84K, about 1 month before going to Cobb. Perhaps other than a slight amount of additional heat, I don't see how a failing pump could be related to the Cobb.

[Glowin]

Originally Posted by JStang

There are many people who are not tuned who have had their water pumps go around the same mileage as you guys. I ran my Cobb tune for almost 45k miles before it finally went out at around 82k miles.

Luck of the draw.

Yeah, maybe it's not all tune related, but you have to admit that my 3 series with only 35,000 miles on it before the pump died must be one of the record low mileage cars?

And then to have my 535 do it too at 50,000 miles makes me think that the average useful life of these suckers is nowhere near the 80,000 miles I've been reading on these forums... I have two data points of my own now!

[Glowin]

PS Did all of you buy OEM pumps? I bought my kit from ECS Tuning, and as of a few months ago when I bought my first pump, I swear that only BMW pumps were available. But I just noticed that I ended up with a German made water pump by some company called Vemo, so I hope it's as good as the BMW pumps... Had never heard of this brand. Anyone?

[JStang]

Originally Posted by Glowin

PS Did all of you buy OEM pumps? I bought my kit from ECS Tuning, and as of a few months ago when I bought my first pump, I swear that only BMW pumps were available. But I just noticed that I ended up with a German made water pump by some company called Vemo, so I hope it's as good as the BMW pumps... Had never heard of this brand. Anyone?

Mine was OEM. Are you saying that ECS sent you a Vemo pump?

[Glowin]

Originally Posted by JStang

Mine was OEM. Are you saying that ECS sent you a Vemo pump?

With the first one I bought for my 335 a few months ago, I'm pretty sure it came with a BMW pump, which was part of their "assembled by ECS" kit (it had the Mahle Behr thermostat in it and you would save $40 vs. getting the BMW thermostat).

But with this latest kit I bought, since only a few months had passed, I presumed it also came with the OEM pump, so I didn't check the detailed kit contents. The pump that came with this kit is the Vemo brand. So I hope it is a solid, quality pump, which ECS claims it is - hence why they put it in their "kit". Since my car is down, I didn't want to bother returning it to get the OEM pump.

I've never heard of this brand. Have you?

[AirAndre335i]

I am JB4 tuned… My water pump popped at 75k and had a new oem one installed in Oct2014… 3k miles later and it had a massive crack in it pissing water all over the place…

I hope it is just a faulty pump and not tune related….

I take it JB4 doesn't increase water pump performance to accommodate for increased boost?

[Kallibrated]

This has been confirmed no. Talked to the Cobb programmer and they do not touch anything with the water pump.