Stillen Underdrive Pulley - Review/Pics/Dyno/Vid

Josh@STILLEN · 08-02-2009, 10:56 PM

The underdrive pulley is also lightweight. Being that they are cut out of billet aluminum they are significantly lighter than the OEM steel pulley.

It's technically a Lightweight Standard Sized Crank Pulley vs. a Lightweight Underdrive Sized Crank Pulley

bmarcinczyk14 · 08-02-2009, 11:15 PM

Quote:

Originally Posted by Josh@STILLEN

The underdrive pulley is also lightweight. Being that they are cut out of billet aluminum they are significantly lighter than the OEM steel pulley.

It's technically a Lightweight Standard Sized Crank Pulley vs. a Lightweight Underdrive Sized Crank Pulley

ohhhh ok, so they both go in the same spot, their the same thing just for different purposes. therefore you have to get one or the other correct?

Josh@STILLEN · 08-03-2009, 02:07 AM

Yes.. one or the other.

The standard pulley uses the stock sized belt.. the underdrive pulley uses a slightly smaller belt (because the pulley itself is smaller, and requires a belt that's shorter)

As it's been discussed, the standard sized is for supercharged applications, as underdriving the supercharger would spin it slower and reduce the horsepower gain

NewYorkJon34 · 08-03-2009, 12:23 PM

^ so this would be ok for a s/c, I just want to make sure cus I plan on buying the stillen s/c

Josh@STILLEN · 08-03-2009, 01:03 PM

If you're planning on the STILLEN supercharger, you would need to use the Standard Pulley during that time. We have a lot of guys running the underdrive until the supercharger is available, and they will swap then.

NewYorkJon34 · 08-03-2009, 03:13 PM

^So it's going to be a twin screw s/c

Josh@STILLEN · 08-03-2009, 03:53 PM

It will be pulley driven..

bmarcinczyk14 · 08-03-2009, 05:48 PM

Quote:

Originally Posted by Josh@STILLEN

Yes.. one or the other.

The standard pulley uses the stock sized belt.. the underdrive pulley uses a slightly smaller belt (because the pulley itself is smaller, and requires a belt that's shorter)

As it's been discussed, the standard sized is for supercharged applications, as underdriving the supercharger would spin it slower and reduce the horsepower gain

i feel kind of worried about underdriving all the belt driven componenets. will it affect the steering considering it will be underdriving the power steering pump?

Josh@STILLEN · 08-03-2009, 06:52 PM

I've only heard 1 person out of the hundreds that have purchased mentioned the steering at a dead stop seemed to take a little more effort, but that feeling was gone after a couple of days (getting used to it)..

Most others report no change is felt at all.

G37Sam · 08-03-2009, 07:06 PM

Very nice! 5whp gain (mind you, on a hotter weather too) from crank pulley is pretty decent!

semtex · 08-04-2009, 08:33 AM

Quote:

Originally Posted by Josh@STILLEN

I've only heard 1 person out of the hundreds that have purchased mentioned the steering at a dead stop seemed to take a little more effort, but that feeling was gone after a couple of days (getting used to it)..

Most others report no change is felt at all.

Yeah I haven't felt any hugely noticeable change. I've had no issues with my steering or anything else since putting the UD pulley in.

bmarcinczyk14 · 08-13-2009, 02:21 AM

does this underdrive pulley cause the headlights to be more dim than before considering its underdriving the alternator?

semtex · 08-13-2009, 08:20 AM

Quote:

Originally Posted by bmarcinczyk14

does this underdrive pulley cause the headlights to be more dim than before considering its underdriving the alternator?

No. My voltage meter hasn't dipped below 14 either, which is where it was prior to the installation. I don't think there will be any adverse effects until and unless you install some monster stereo system or something.

bmarcinczyk14 · 08-30-2009, 11:59 PM

will this have any affect on the power braking system? or does that system run off the battery, and not engine?

semtex · 08-31-2009, 08:23 AM

Okay, look, there are no negative effects to anything, period. None. Zero. Nada. Clear?

08-03-2009, 07:06 PM	#40 (permalink)
G37Sam A True Z Fanatic Join Date: Dec 2008 Location: Dubai, UAE Posts: 1,507 Drives: RB'd G37 Rep Power: 20	Very nice! 5whp gain (mind you, on a hotter weather too) from crank pulley is pretty decent! __________________ '14 Viper GTS '08 RB'd G37S - Sold

08-31-2009, 08:23 AM	#45 (permalink)
semtex A True Z Fanatic Join Date: Jan 2009 Location: Behind enemy lines Age: 54 Posts: 5,995 Drives: People to drink Rep Power: 32	Okay, look, there are no negative effects to anything, period. None. Zero. Nada. Clear? __________________ "There are no small accidents on this circuit." -- Ayrton Senna 316.8whp & 248 ft/lbs (Dyno Dynamics) \| 319whp & 256 ft/lbs (DynoJet) (04/23/10) Stillen G3 CAI, CBE, Pulley / F.I. LTH / GTSpec Ladder Brace / Setrab Oil Cooler / UpRev-tuned by Forged Perf.

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08-02-2009, 10:56 PM	#31 (permalink)
Josh@STILLEN The370Z.com Sponsor Join Date: Dec 2008 Location: Costa Mesa, CA Posts: 1,197 Drives: 2004 G35 Coupe 6MT Rep Power: 533	The underdrive pulley is also lightweight. Being that they are cut out of billet aluminum they are significantly lighter than the OEM steel pulley. It's technically a Lightweight Standard Sized Crank Pulley vs. a Lightweight Underdrive Sized Crank Pulley

08-03-2009, 02:07 AM	#33 (permalink)
Josh@STILLEN The370Z.com Sponsor Join Date: Dec 2008 Location: Costa Mesa, CA Posts: 1,197 Drives: 2004 G35 Coupe 6MT Rep Power: 533	Yes.. one or the other. The standard pulley uses the stock sized belt.. the underdrive pulley uses a slightly smaller belt (because the pulley itself is smaller, and requires a belt that's shorter) As it's been discussed, the standard sized is for supercharged applications, as underdriving the supercharger would spin it slower and reduce the horsepower gain

08-03-2009, 12:23 PM	#34 (permalink)
NewYorkJon34 A True Z Fanatic Join Date: Jun 2009 Location: Naples, Florida Posts: 3,041 Drives: 09 Fairlady Z Rep Power: 1065	^ so this would be ok for a s/c, I just want to make sure cus I plan on buying the stillen s/c

08-03-2009, 01:03 PM	#35 (permalink)
Josh@STILLEN The370Z.com Sponsor Join Date: Dec 2008 Location: Costa Mesa, CA Posts: 1,197 Drives: 2004 G35 Coupe 6MT Rep Power: 533	If you're planning on the STILLEN supercharger, you would need to use the Standard Pulley during that time. We have a lot of guys running the underdrive until the supercharger is available, and they will swap then.

08-03-2009, 03:13 PM	#36 (permalink)
NewYorkJon34 A True Z Fanatic Join Date: Jun 2009 Location: Naples, Florida Posts: 3,041 Drives: 09 Fairlady Z Rep Power: 1065	^So it's going to be a twin screw s/c

08-03-2009, 03:53 PM	#37 (permalink)
Josh@STILLEN The370Z.com Sponsor Join Date: Dec 2008 Location: Costa Mesa, CA Posts: 1,197 Drives: 2004 G35 Coupe 6MT Rep Power: 533	It will be pulley driven..

08-03-2009, 06:52 PM	#39 (permalink)
Josh@STILLEN The370Z.com Sponsor Join Date: Dec 2008 Location: Costa Mesa, CA Posts: 1,197 Drives: 2004 G35 Coupe 6MT Rep Power: 533	I've only heard 1 person out of the hundreds that have purchased mentioned the steering at a dead stop seemed to take a little more effort, but that feeling was gone after a couple of days (getting used to it).. Most others report no change is felt at all.

08-13-2009, 02:21 AM	#42 (permalink)
bmarcinczyk14 Track Member Join Date: Jul 2009 Location: Chicago Posts: 505 Drives: 2010 370z 6spd Sport Rep Power: 17	does this underdrive pulley cause the headlights to be more dim than before considering its underdriving the alternator?

08-30-2009, 11:59 PM	#44 (permalink)
bmarcinczyk14 Track Member Join Date: Jul 2009 Location: Chicago Posts: 505 Drives: 2010 370z 6spd Sport Rep Power: 17	will this have any affect on the power braking system? or does that system run off the battery, and not engine?