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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 07-07-2010, 12:58 AM   #1
SalM
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Water Pump & Pulleys Help!

Sup Guys I'm looking to Buy a New High Performance Water Pump and new Pulleys

They Only Brand I seem to see good and noticeable improvements is with the Uuc Underdrive Pulleys And The High Performance Water Pump On their Webstite and Both For $450 Shipped After Tax

But Before I pull the trigger

What Company has better Pulleys And Waterpumps that Show/Feel a more signifigant Gain in power

In general with a new High performance water pump is there or I should say do you feel more power while driving?

Same Question As Above Except Involving The Pulleys?
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Old 07-07-2010, 01:40 AM   #2
i0kr1sol
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You wont gain power with a 'high performance' water pump.

There are two sides in every story, search about underdrive pulleys. Some say the difference is negligible, some even say their dangerous.

And a lot of people go for the Stewart Water Pump for upgrading their water pumps.
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Old 07-10-2010, 01:32 AM   #3
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Originally Posted by i0kr1sol View Post
You wont gain power with a 'high performance' water pump.

There are two sides in every story, search about underdrive pulleys. Some say the difference is negligible, some even say their dangerous.

And a lot of people go for the Stewart Water Pump for upgrading their water pumps.
its really only dangerous if you underdrive the alternator when you have a system in your car.
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Old 07-07-2010, 01:45 AM   #4
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Im not looking to gain like Hp power out of the pump Just Power in general would car feel like it has more power since the water flow is increased by almost 35%
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Old 07-07-2010, 05:30 PM   #5
msb046
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Im not looking to gain like Hp power out of the pump Just Power in general would car feel like it has more power since the water flow is increased by almost 35%
Increased water flow has nothing to do with how the car "feels," but only how well the engine is cooled. It would just be better than the OEM pump at preventing the car from overheating. I'm not really sure what you mean by "would the car feel more powerful" while not referring to the HP.

However, if the high performance pump has a better flow-design resulting in less resistance, then you could technically get less parasitic drain on the engine and maybe an extremely small power increase. Most likely you wouldn't be able to feel the power gain, though.

If you underdrive the water pump (literally slowing down your water pump by using a larger pulley,) you would decrease the load on the engine (at the expense of decreasing the effectiveness of your cooling system.) Some say doing this has noticeable power gains, others say it doesn't.

IMO don't mess with underdriving cooling system. It's not something you want failing on you at any point, because the cost will outweigh the benefits.

If you do decide to underdrive the water pump, then replacing the pump with the high performance stewart pump could help counteract the decreased cooling effectiveness.
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Old 07-07-2010, 11:18 PM   #6
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Thanks for the Input guys!
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Old 07-09-2010, 07:10 PM   #7
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Bump!
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Old 07-09-2010, 07:50 PM   #8
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I've got the Stewart pump. No real noticeable difference. It's just a better pump.

Find a way of eliminating the mechanical fan (ie Zionsville) and you will notice a better throttle response
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Old 07-09-2010, 08:45 PM   #9
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Please Explain more.... About this Mechanical fan elimination u speak of
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Old 07-09-2010, 11:45 PM   #10
xi_ter
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This thread explains swapping an electrical fan in.
http://forum.e46fanatics.com/showthread.php?t=744994
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Old 07-10-2010, 10:03 AM   #11
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How come?
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Old 07-10-2010, 10:08 AM   #12
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Loose a battery charge I would guess
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Old 07-10-2010, 04:53 PM   #13
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Ok So far the pricing is

Stuarts WaterPump - $195
Uuc Pulleys - $199
Electrical Fan - $253

But I have a quick question I have a Manual Does The Electrical Fan still need to be replace or I should say does manual have an electical fan or its mechanical aswell...
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Old 07-10-2010, 05:00 PM   #14
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Quote:
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Ok So far the pricing is

Stuarts Water Pump - $195
Uuc Pulleys - $199
Electrical Fan - $253

...
The priority should be
1- fan
2- pump
3- pulley
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Old 07-10-2010, 05:04 PM   #15
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Oh yeah That I know thats just how I wrote it....
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Old 07-10-2010, 05:06 PM   #16
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BMP design has the Stewart water pump for 165.96. You can get another 10% off if you are BMWCCA member.
They also have aluminum water pump and power steering pulleys, standard size not under drive. They are about $33.00 each.
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Discounts on new and CPO cars.
Most Dealers offer a parts discount, BMP Design 10% off
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Old 07-10-2010, 05:08 PM   #17
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Oh wow Bmp Has good prices... I actually just saw that while Searching up the Water Pump on Google
And Im looking at the underdrive Pulleys from Uuc Motorwerks....

So Far Pricing.....

1. Electrical Fan - $253
2. Water Pump - $165
3. Underdrive Pulleys - $199
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Old 07-11-2010, 09:20 AM   #18
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Any More Opinions On Underdrive Pulleys?
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Old 07-12-2010, 08:15 PM   #19
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More opinions?
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