Review Say hello to my UR Underdrive Crank Pulley

G37Sam · 05-09-2009, 01:46 AM

Just got my hands on those!

Install

Well it isn't the easiest job to do, unless you know what you're doing have it professionally installed. The OEM bolts are so damn tight it's not funny. The bolt which bolts the OEM Pulley to the crank shaft felt like it was welded to the crank! The mechanic suggested removing the starter and holding the flywheel from one side and unscrewing from the other and bingo the bolt is loose. A little WD40 and some pushing & hammering and it finally came out.

Here's the bolt I'm talking about:

OEM vs. UR side by side:

The OEM felt so much heavier!

Impression

After driving around for a while it did feel like it revved faster when I floored it. It also felt a little more responsive when I was swimming through traffic. I wanted to get a before/after dyno on this but I was quoted like 300 bux!! That's more than the pulley & the install combined lol I'm happy with it, tails even easier to slide I'm not complaining haha

chamelieon · 05-09-2009, 01:49 AM

being that the UR pulley is just a bling factor.. you cant even see it under all the crap on top.. second of all ..your factory pulley is a dampener.. it has rubber insides which dampen the shock vibrations from your crank.. without that very bad effects can happen.. if the G uses a crank driven oil pump gear then kiss that goodbye. bottom line you will be super lucky if you can even get 1hp from this.

G37Sam · 05-09-2009, 01:54 AM

factory pulley is not a dampener, I read it on the370Z that our engines are pre-balanced and pulley has no dampening effect

cvt · 05-09-2009, 03:00 AM

Quote:

Originally Posted by G37Sam

factory pulley is not a dampener, I read it on the370Z that our engines are pre-balanced and pulley has no dampening effect

This is true...it also applies to the VQ35...but I found that gains were minimal if non-existant...it revs a little better...thats it.

jnguyen · 05-09-2009, 03:19 AM

Quote:

Originally Posted by cvt

it revs a little better...thats it.

thats all sam need. he just like squeeling his wheels

SOLISIMO · 05-09-2009, 07:33 AM

Hope you like it Sam!!

xo4ox · 05-09-2009, 10:20 AM

Please let us know when you install this, I'm really interested and might get it if it improves the throttle response and make the car rev faster!

G37Sam · 05-11-2009, 01:25 PM

Installed, pix taken and a small review

CEELOSG37S · 05-11-2009, 01:38 PM

Nice pics and review. Better engine response and revving, Im sold.

DanMardik · 05-11-2009, 11:10 PM

Thanks for the review Sam. I appreciate you!

chamelieon · 05-12-2009, 01:21 AM

Quote:

Originally Posted by xo4ox

Please let us know when you install this, I'm really interested and might get it if it improves the throttle response and make the car rev faster!

if you want to achieve this then just get a lightened flywheel!

VONYC · 05-12-2009, 02:41 AM

sam idk about u but there was no improvement with this mod ..

atleast for me ..

gtracing · 05-12-2009, 02:56 AM

well whoever said that the factory pulley is not a dampener is a complete moron....

i don't care how WELL balanced your engine is....it is never perfect...and with even the slightest vibrations, it can cause some serious damage without the factory harmonic dampener....(i know from experience)...

even turning on your A/C can cause damage since the belt will vibrate when the A/C engages....

the vibrations may not cause any damage in the short run...but in the long run...you will start feeling weird vibrations coming from the engine..which you will feel in your cabin...followed by you kissing your crank seal good bye....once your crank seal goes...ur engine will pretty much drain all it's oil into your transmission (will slowly leak)...

lots of people say that the harmonic dampener does nothing...i beg to differ...good luck

for that extra 1whp, it's almost not worth a future full of headaches and empty wallets

http://www.atiracing.com/products/da...mper_dinan.htm

G37Sam · 05-12-2009, 03:25 AM

Quote:

Originally Posted by chamelieon

if you want to achieve this then just get a lightened flywheel!

not on an AT though

G37Sam · 05-12-2009, 03:29 AM

Quote:

Originally Posted by VONYC

sam idk about u but there was no improvement with this mod ..

atleast for me ..

well I didnt say I gained 50 horses, those arent intake scoops haha but I can feel a slight difference

05-09-2009, 01:46 AM	#1
G37Sam Post whores must die!! 2008 Infiniti G37 Trader Score: (0) Join Date: Aug 2008 Location: Lebanon & UAE Posts: 9,968	Say hello to my UR Underdrive Crank Pulley Just got my hands on those! Install Well it isn't the easiest job to do, unless you know what you're doing have it professionally installed. The OEM bolts are so damn tight it's not funny. The bolt which bolts the OEM Pulley to the crank shaft felt like it was welded to the crank! The mechanic suggested removing the starter and holding the flywheel from one side and unscrewing from the other and bingo the bolt is loose. A little WD40 and some pushing & hammering and it finally came out. Here's the bolt I'm talking about: OEM vs. UR side by side: The OEM felt so much heavier! Impression After driving around for a while it did feel like it revved faster when I floored it. It also felt a little more responsive when I was swimming through traffic. I wanted to get a before/after dyno on this but I was quoted like 300 bux!! That's more than the pulley & the install combined lol I'm happy with it, tails even easier to slide I'm not complaining haha __________________ '08 AG G37S 5AT \| Fully Loaded \| Tint \| Clear Bra \| FI CF Catback \| PC Rims \| BB's V2 GK \| Eibach Pro Kit \| Painted Grille \| 4x20mm H&R Spacers \| Stillen 3rd Gen Intakes \| FI Non-Res Test Pipes \| Customized Fox Resonators \| FR:245/40 RR:275/35 \| UR Crank Pulley \| PIAA Fogs Before you post: - Check out this lovely feature! - Read our Guidelines - Read the forum rules - Learn how to post Not knowing your way around? \| Getting lost in this place? \| Looking for factory manuals? \| Want to become premier? \| Want to mod but don't know where to start? \| Need specs of OEM wheels? \| Got G? Check In! \| We know what a G looks like, what do you look like? \| Classic post? Post it up Last edited by G37Sam; 05-11-2009 at 01:23 PM.

05-09-2009, 01:49 AM	#2
chamelieon 450whp or Bust!! Trader Score: (1) Join Date: Jul 2008 Location: New York Posts: 458	being that the UR pulley is just a bling factor.. you cant even see it under all the crap on top.. second of all ..your factory pulley is a dampener.. it has rubber insides which dampen the shock vibrations from your crank.. without that very bad effects can happen.. if the G uses a crank driven oil pump gear then kiss that goodbye. bottom line you will be super lucky if you can even get 1hp from this. __________________ 08 G37S PG - www.NoLimitMotorSport.com Last edited by G37Sam; 05-10-2009 at 11:02 PM.

05-09-2009, 01:54 AM	#3
G37Sam Post whores must die!! 2008 Infiniti G37 Trader Score: (0) Join Date: Aug 2008 Location: Lebanon & UAE Posts: 9,968	factory pulley is not a dampener, I read it on the370Z that our engines are pre-balanced and pulley has no dampening effect __________________ '08 AG G37S 5AT \| Fully Loaded \| Tint \| Clear Bra \| FI CF Catback \| PC Rims \| BB's V2 GK \| Eibach Pro Kit \| Painted Grille \| 4x20mm H&R Spacers \| Stillen 3rd Gen Intakes \| FI Non-Res Test Pipes \| Customized Fox Resonators \| FR:245/40 RR:275/35 \| UR Crank Pulley \| PIAA Fogs Before you post: - Check out this lovely feature! - Read our Guidelines - Read the forum rules - Learn how to post Not knowing your way around? \| Getting lost in this place? \| Looking for factory manuals? \| Want to become premier? \| Want to mod but don't know where to start? \| Need specs of OEM wheels? \| Got G? Check In! \| We know what a G looks like, what do you look like? \| Classic post? Post it up

05-09-2009, 07:33 AM	#6
SOLISIMO GOT CAMBER? 2008 Infiniti G37 Trader Score: (7) Join Date: Apr 2008 Location: SOUTH FLORIDA Posts: 5,140	Hope you like it Sam!! __________________ AUTOKITS-X CARBON FIBER REAR VALENCE & GRILLES l TANABE COILS l STILLEN SWAYS l MXP EXHAUST l BERK HFC l SSR'S l HANKOOK'S l INJEN CAI l TS BUMPER l 3K HID FOGS l ICHIBA CAMBER l KICS R40'S l ILLUMINATED SILLS l GROUNDING KIT l VLEDS l SPECIAL THANKS TO AUTOKITS-X l LOU@AMPLIFIED l AUTOGLITZ l

05-09-2009, 10:20 AM	#7
xo4ox Premier Member 2009 Infiniti G37 Trader Score: (3) Join Date: Nov 2007 Location: Riyadh, Kingdom of Saudi Arabia Posts: 543	Please let us know when you install this, I'm really interested and might get it if it improves the throttle response and make the car rev faster! __________________ Modular Concept 01 \| Eibach Pro Kit \| FI CF Exhaust & HFC \| Stillen G3 \| GT-Spec Strut Bar SE CF Engine Cover \| BB's CF V2 GK \| AutoKits-X CF Rear Lip \| MB Grille \| JP Vizage Side Skirts

05-11-2009, 01:25 PM	#8
G37Sam Post whores must die!! 2008 Infiniti G37 Trader Score: (0) Join Date: Aug 2008 Location: Lebanon & UAE Posts: 9,968	Installed, pix taken and a small review __________________ '08 AG G37S 5AT \| Fully Loaded \| Tint \| Clear Bra \| FI CF Catback \| PC Rims \| BB's V2 GK \| Eibach Pro Kit \| Painted Grille \| 4x20mm H&R Spacers \| Stillen 3rd Gen Intakes \| FI Non-Res Test Pipes \| Customized Fox Resonators \| FR:245/40 RR:275/35 \| UR Crank Pulley \| PIAA Fogs Before you post: - Check out this lovely feature! - Read our Guidelines - Read the forum rules - Learn how to post Not knowing your way around? \| Getting lost in this place? \| Looking for factory manuals? \| Want to become premier? \| Want to mod but don't know where to start? \| Need specs of OEM wheels? \| Got G? Check In! \| We know what a G looks like, what do you look like? \| Classic post? Post it up

05-11-2009, 01:38 PM	#9
CEELOSG37S LA G's Club 2008 Infiniti G37 Trader Score: (3) Join Date: Apr 2009 Location: Downey,California LAG's MIA Member Posts: 4,043	Nice pics and review. Better engine response and revving, Im sold. __________________ 08 Vibrant Red G37S TeamLAGs.Com I see the hate in your eyez.

05-11-2009, 11:10 PM	#10
DanMardik Registered User Trader Score: (3) Join Date: Jul 2008 Location: Irvine, CA Posts: 381	Thanks for the review Sam. I appreciate you!

05-12-2009, 02:41 AM	#12
VONYC Registered User Trader Score: (0) Join Date: Aug 2008 Location: MIAMI Posts: 958	sam idk about u but there was no improvement with this mod .. atleast for me ..

05-12-2009, 02:56 AM	#13
gtracing Registered User Trader Score: (1) Join Date: Dec 2008 Location: Richmond, B.C. Posts: 552	well whoever said that the factory pulley is not a dampener is a complete moron.... i don't care how WELL balanced your engine is....it is never perfect...and with even the slightest vibrations, it can cause some serious damage without the factory harmonic dampener....(i know from experience)... even turning on your A/C can cause damage since the belt will vibrate when the A/C engages.... the vibrations may not cause any damage in the short run...but in the long run...you will start feeling weird vibrations coming from the engine..which you will feel in your cabin...followed by you kissing your crank seal good bye....once your crank seal goes...ur engine will pretty much drain all it's oil into your transmission (will slowly leak)... lots of people say that the harmonic dampener does nothing...i beg to differ...good luck for that extra 1whp, it's almost not worth a future full of headaches and empty wallets http://www.atiracing.com/products/da...mper_dinan.htm Last edited by gtracing; 05-12-2009 at 03:07 AM.

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