underdrive pulleys?

templarklimek · 10-20-2013, 12:18 AM

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

Mirko · 10-20-2013, 10:06 AM

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.

templarklimek · 10-20-2013, 02:41 PM

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.

DanFromTucson · 10-20-2013, 06:44 PM

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.

templarklimek · 10-20-2013, 07:12 PM

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!!

seank · 10-20-2013, 10:06 PM

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

10-20-2013, 12:18 AM	#1
templarklimek templarklimek 151 Rep 868 Posts Drives: 15' X6M, 12' R8 V10, Join Date: Jun 2008 Location: Houston Texas iTrader: (0)	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, 10:06 AM	#2
Mirko Major 254 Rep 1,085 Posts Drives: SUV Join Date: Apr 2011 Location: Toronto iTrader: (2)	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, 02:41 PM	#3
templarklimek templarklimek 151 Rep 868 Posts Drives: 15' X6M, 12' R8 V10, Join Date: Jun 2008 Location: Houston Texas iTrader: (0)	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, 06:44 PM	#4
DanFromTucson Private First Class 12 Rep 195 Posts Drives: Z4 M Coupe Join Date: Aug 2011 Location: Austin, TX iTrader: (0)	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, 07:12 PM	#5
templarklimek templarklimek 151 Rep 868 Posts Drives: 15' X6M, 12' R8 V10, Join Date: Jun 2008 Location: Houston Texas iTrader: (0)	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, 10:06 PM	#6
seank enthusiast 55 Rep 1,695 Posts Drives: e30 m3,e90 wagon,sprinter,z4m Join Date: Dec 2011 Location: sacramento, ca iTrader: (4)	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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