Underdrive Pulleys

Kgolf31 · 02-23-2014, 12:25 PM

Is anyone even attempting to make underdrive pulleys for our engine?

I've been searching forever, and cannot find anything.

Taskmaster · 02-23-2014, 09:18 PM

Nope. Water pump is electric, the fan is electric and all that is left would be a crank pulley and possible alternator and/or power steering.

Kgolf31 · 02-23-2014, 09:43 PM

Quote:

Originally Posted by TheAxiom

Nope. Water pump is electric, the fan is electric and all that is left would be a crank pulley and possible alternator and/or power steering.

well, this was quite the stupid question now wasn't it....
/facepalm

Freon · 02-24-2014, 10:18 AM

As an aside, my personal experience with under drive pulleys is that they aren't worth it regardless. They can cause battery charging issues if you idle as much as expected for a daily driver. I wouldn't put one on a car unless it was a fairly dedicated race car (track car, weekend autocross car, not a daily driver).

Now a lightweight pulley might be worth it, but I'm sure there are still differing opinions on that even for an I6.

Kgolf31 · 02-24-2014, 10:20 AM

Quote:

Originally Posted by Freon

As an aside, my personal experience with under drive pulleys is that they aren't worth it regardless. They can cause battery charging issues if you idle as much as expected for a daily driver. I wouldn't put one on a car unless it was a fairly dedicated race car (track car, weekend autocross car, not a daily driver).

Now a lightweight pulley might be worth it, but I'm sure there are still differing opinions on that even for an I6.

I'm trying to go full prep for SCCA STX. Underdrive pulleys were on the list...

Taskmaster · 03-13-2014, 09:30 PM

I made like 3 - 5whp with mine on my Z3. They 'worked' but 250 was better spent elsewhere.

Kgolf31 · 03-13-2014, 09:42 PM

Quote:

Originally Posted by TheAxiom

I made like 3 - 5whp with mine on my Z3. They 'worked' but 250 was better spent elsewhere.

Full prep is full prep. Need to squeeze all bit out of the engine as possible. Just trying to forecast budget and spending

TheSt|G · 03-14-2014, 07:09 AM

S85 makes decent power from them. I doubt you would get more than one from our car.

Never been a fan of lightweight pulleys for balance reasons.

Taskmaster · 03-14-2014, 09:14 AM

Quote:

Originally Posted by TheSt|G

S85 makes decent power from them. I doubt you would get more than one from our car.

Never been a fan of lightweight pulleys for balance reasons.

Crank - no.
Accessories - yea.

TheSt|G · 03-14-2014, 10:21 AM

Quote:

Originally Posted by TheAxiom

Crank - no.
Accessories - yea.

And lightweight flywheels while we are at it.

Assuming crank as we have essentially no accessories.

Taskmaster · 03-14-2014, 10:39 AM

Not a fan of LTW flywheels either.

Kgolf31 · 03-14-2014, 11:15 AM

Quote:

Originally Posted by TheAxiom

Not a fan of LTW flywheels either.

How so?

LTW Flywheels aren't legal for my class, but assuming they were...I don't see a reason why that wouldn't be reason to not do them

TheSt|G · 03-14-2014, 11:59 AM

Quote:

Originally Posted by Kgolf31

How so?

LTW Flywheels aren't legal for my class, but assuming they were...I don't see a reason why that wouldn't be reason to not do them

Same reason, plus all the chatter.

Kgolf31 · 03-14-2014, 12:03 PM

Quote:

Originally Posted by TheSt|G

Same reason, plus all the chatter.

Who really cares about chatter?

Anyways, LTW is actually a great upgrade.

My friend had a E36 M and did a LTW Flywheel with E39 M5 Clutch. The car grabbed second gear and was faster through first than my Z4M. My car felt like a slug compared to a car with 100 less HP.

Taskmaster · 03-14-2014, 12:08 PM

Crank Pulleys and LTW flywheels don't provide the damping stock parts do, which can lead to harmonic issues on the engines.

TheSt|G · 03-14-2014, 12:44 PM

Quote:

Originally Posted by TheAxiom

Crank Pulleys and LTW flywheels don't provide the damping stock parts do, which can lead to harmonic issues on the engines.

Exactly.

Quote:

Originally Posted by Kgolf31

Who really cares about chatter?

Anyways, LTW is actually a great upgrade.

My friend had a E36 M and did a LTW Flywheel with E39 M5 Clutch. The car grabbed second gear and was faster through first than my Z4M. My car felt like a slug compared to a car with 100 less HP.

It can be a bit tiresome when everyone asks you if your car is ok at every traffic light. I had one on my E36 M3, never again for a street car.

It was nice for the downshifts, but the N52 with the 6MT is hardly sluggish on the downshifts thanks to our relatively light stock flywheel and very light engine internals. It's not like we have a G37 engine.

02-23-2014, 12:25 PM	#1
Kgolf31 Brigadier General 460 Rep 4,531 Posts Drives: 2007 Z4MC, 2012 128i Join Date: Sep 2008 Location: Ohio iTrader: (4)	Underdrive Pulleys Is anyone even attempting to make underdrive pulleys for our engine? I've been searching forever, and cannot find anything.
	Appreciate 0 Tweet Quote

02-23-2014, 09:18 PM	#2
Taskmaster Banned 2465 Rep 9,004 Posts Drives: M235i 6MT / E92 328 Msport 6MT Join Date: Nov 2013 Location: Florida iTrader: (6)	Nope. Water pump is electric, the fan is electric and all that is left would be a crank pulley and possible alternator and/or power steering.
	Appreciate 0 Quote

02-24-2014, 10:18 AM	#4
Freon Major 81 Rep 1,051 Posts Drives: 2009 135i Join Date: Nov 2007 Location: Indianapolis iTrader: (3)	As an aside, my personal experience with under drive pulleys is that they aren't worth it regardless. They can cause battery charging issues if you idle as much as expected for a daily driver. I wouldn't put one on a car unless it was a fairly dedicated race car (track car, weekend autocross car, not a daily driver). Now a lightweight pulley might be worth it, but I'm sure there are still differing opinions on that even for an I6. __________________ 2009 BMW 135i 6MT Sport, AFE intake, Cobb AP, Apex 18x8.5+9.5, 255/275 PSS
	Appreciate 0 Quote

03-13-2014, 09:30 PM	#6
Taskmaster Banned 2465 Rep 9,004 Posts Drives: M235i 6MT / E92 328 Msport 6MT Join Date: Nov 2013 Location: Florida iTrader: (6)	I made like 3 - 5whp with mine on my Z3. They 'worked' but 250 was better spent elsewhere.
	Appreciate 0 Quote

03-14-2014, 07:09 AM	#8
TheSt\|G Resident Tamed Racing Driver 298 Rep 4,697 Posts Drives: 911, 130is, E39 M5, E36 M3 Join Date: Mar 2008 Location: Outside Philly iTrader: (2)	S85 makes decent power from them. I doubt you would get more than one from our car. Never been a fan of lightweight pulleys for balance reasons. __________________ 2005 E46 M3 Interlagos/Cinnamon with Sunroof Delete
	Appreciate 0 Quote

03-14-2014, 10:39 AM	#11
Taskmaster Banned 2465 Rep 9,004 Posts Drives: M235i 6MT / E92 328 Msport 6MT Join Date: Nov 2013 Location: Florida iTrader: (6)	Not a fan of LTW flywheels either.
	Appreciate 0 Quote

03-14-2014, 12:08 PM	#15
Taskmaster Banned 2465 Rep 9,004 Posts Drives: M235i 6MT / E92 328 Msport 6MT Join Date: Nov 2013 Location: Florida iTrader: (6)	Crank Pulleys and LTW flywheels don't provide the damping stock parts do, which can lead to harmonic issues on the engines.
	Appreciate 0 Quote