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      10-19-2013, 11:18 PM   #1
templarklimek
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underdrive pulleys?

Gents, i've not seen any usage of these on z4M's. I used them on my e92 M3. Is their a reason they aren't popular on out Z4's? 11 hp gain.

http://www.beastpower.com/p/bmw/vac-...VC-BE3M-S54-PK
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      10-20-2013, 09:06 AM   #2
Mirko
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I had them on my 330ci and liked them. Not sure if they did too much but I felt like the rpm's climbed faster from about 4.5K to redline. I've held off getting them because I can't make up my mind of staying NA or getting a blower.
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      10-20-2013, 01:41 PM   #3
templarklimek
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Nobody with a Z4M has used these? For the S65M3 its one of the first mods people do.

Is there an issue with them I don't kow about? TY.
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      10-20-2013, 05:44 PM   #4
DanFromTucson
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I have them on my M Coupe. I didn't notice much of a difference, but that can be typical for a modification that raises power across the rev range. At least, that's my optimistic view.
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      10-20-2013, 06:12 PM   #5
templarklimek
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agreed, all the little mods to help a N/A engine by themselves aren't huge. But together hopefully add up. i'm hopeful for for about 380-385 hp with all the following:

intake
exhaust/xpipes/headers
tune
underdrive pulleys

Then the S/C!!
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      10-20-2013, 09:06 PM   #6
seank
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People have them, but most of this crowd isn't doing a lot of engine mods. I think a light weight clutch and flywheel would be more advantageous than under drive pulleys, but I haven't heard of anyone ever doing it on here
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