pulleys

[webster]

From TMS:

"As used on our racecars and street cars, these are engineered not only to be the best pulley kits on the market but also to provide the best compromise between performance and reliability. Specifically, we have designed them to underdrive the water pump, power steering pump and alternator*. Adding these is like getting FREE HORSEPOWER - there are no downsides and underdriving each of these accessories has been proven safe through years of on and off-track use. We do not believe it is safe to change the crankshaft pulley due to the potential harm to the crankshaft. These kits provide a 10%-20% overall reduction in driving your car's systems and have been dyno-tested with a gain of up to 11hp.

Kit includes water pump, power steering, alternator pulleys and belt. The T-6061 hard anodized aluminum pulleys account for a 10 to 20-percent decrease in accessory speeds, reducing the load on the engine but still maintaining a safe margin for reliability on all components. Installation involves removing the fan for easy access to the front of the engine. The main drive belt comes off easy and each pulley is mounted with Allen head bolts. Typical installation time is 1.5 hours. New main drive belt is included. The pulleys were good for 10.7hp at 6960 rpm and 8.1 lb-ft of torque at 5550 on the 1995 M3."

There are others. Just to give you an idea of what they do

not bad for $250. do ZHPs have bosch or valeo alternators?

[danewilson77]

not bad for $250. do ZHPs have bosch or valeo alternators?

Could be either.....You will have to look.

[Hornung418]

Just pull the air box and check.

My 2 cents now that we're discussing UD pulleys: I've had mine installed for over 5k miles. I went with Rogue Engineering; partly due to cost, and partly due to availability. It seems that no one has these in stock! So my impressions are skewed because I've got some other things going on under the hood, but it definitely is a much better drive. Not as loose as it was when stock. The throttle is much more responsive and I've definitely made power to the wheels. The construction is solid and much more durable than the current stock pulleys.

So on to the case of the weight. It will has no effect on anything. It's all a marketing ploy, lighter is the same as heavy it all spins at the same rate because it's driven from the circumference. It would be a different story if it was driven from the origin of the pulley. I wouldn't suggest TMS because they lighten the ALT pulley, which is unnecessary...just keep it stock. The pulleys from RE were $185 + s&h, no ALT Pulley included.

[Scorpius]

Thinking I may see a pulley system in my near future. Seeing I'm 161k miles what other things should I replace? Tensioner pulley, idler pulley? Are there more than those two? Do the lit weight puppies come with torque specs? I torque everything.

[danewilson77]

Thinking I may see a pulley system in my near future. Seeing I'm 161k miles what other things should I replace? Tensioner pulley, idler pulley? Are there more than those two? Do the lit weight puppies come with torque specs? I torque everything.

Two tensioners and an idler/deflection pulley.


Water pump and idler

http://www.realoem.com/bmw/showparts...90&hg=11&fg=18



AC

http://www.realoem.com/bmw/showparts...63&hg=11&fg=18

[kayger12]

Not a bad idea to replace the water pump pulley while you're at it. Mine was damn brittle for 6 years old and <60k miles.

[johnrando]

Bought mine from Turner, just hadn't installed yet. Soon, and will report back.

[mr hish]

well seems that i made a good choice buying those pullies :D hope they arrive soon

[Scorpius]

Not a bad idea to replace the water pump pulley while you're at it. Mine was damn brittle for 6 years old and <60k miles.

man...these pulleys will turn out to be a good 500.00 job lol. not to mention i hear the water pump is a severe weak point in the system for our cars. no issues with mine yet, but if i'm doing the pulley on it, may as well pull the pump while my wrenches are near it .

[Hornung418]

Guys...the underdrive pulleys replace the Water Pump Pulley and the Power Steering Pulley. The alternator pulley is pointless to replace with anything but OEM.

Total is $185-250 plus Shipping.