Experences With Underdrive Pulleys - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

MickGIS · 12-15-2014, 02:32 PM

I have read many posts on the pros and cons of underdrive pulleys here and on ModernCamaro and have determined that these two are of interest:

Fluidampr Harmonic Damper vs SLP Balancer/Underdrive Pulley

What are your experiences with them and why do you prefer one over the other?

MickGIS · 12-21-2014, 09:52 AM

Quote:

Originally Posted by Chapel

...
Or you can try this dude on LS1 tech forums. Here is the link:
Flywheel flexplate holders - LS1TECH

See if he still has them. It should work on your engine.

Originally Posted by MickGIS
I asked the Guy on LS1Tech and he said:
"Yes I have them. $35 Shipped in the USA $50 to canada..."

Thanks for the tip.

Originally Posted by MickGIS
Payed Tim on LS1Tech via PayPal and less then two hours later the tool was shipped, amazing.

I shopped around online and the best price I found was at Jannetty Racing Performance Parts.
For$263.44 delivered to Colorado they offer 2010-2015 Camaro SS SLP Underdrive Pulley & Balancer Assembly **SPECIAL W/BELTS AND CRANK BOLT**

Maybe a coupon somewhere too.

O'Reilly's Auto Parts has for use both the Underdrive pulley/Balancer Remover & Installer.

Spartan01 · 12-22-2014, 07:52 AM

I have the SLP.
Took it to 3 different places, nobody could install it but a GM dealer.
I did not notice a difference after the install, but who would notice 3-7 HP on a 400+ HP vehicle?
I did get it from Jannetty, with the special. It is a pretty good deal.
Installed it this time last year, no issues so far.

1killer_SS · 12-22-2014, 07:13 PM

I got my SLP from Marylandspeed, while I dont notice the small HP gains either, they all add up. CAI, headers, Yadda yadda yadda I went for full bolt-ons. and after it was all said and done I certainly noticed the HP increase.

I did have to bump up my RPM's to 675 from 550 to keep the electrical system happy. other than that no complaints. The installer wasnt so happy to install it, he said it was a PITA

Jared91 · 12-22-2014, 07:36 PM

X2. Install is easy just a huge pain in the balls.

Juice2SS · 12-22-2014, 07:52 PM

Quote:

Originally Posted by Jared91

X2. Install is easy just a huge pain in the balls.

I've never had an easy huge pain in the balls. lol

Pro Stock John · 12-22-2014, 07:58 PM

Powerbond, used, 18K on mine. No charging issues.

EmeryZ28 · 12-22-2014, 08:06 PM

Back in the day I installed a set of March underdrive pulleys on a TPI motor. This was the alt pulley, water pump and crank. I installed them along with a hypertech chip and a BBK TB. I noticed a nice butt dyno increase.

Ever since I moved on to LSx cars, I have heard nothing but mixed reviews and lots of bitching about the install. In my opinion, from the intel I have gathered, I feel that an underdrive pulley is last in line amongst the other bolt ons.

Josh @ Spartan LSX · 12-22-2014, 11:35 PM

SLP / Powerbond pulleys are the same pulley, and the only one I'd recommend accept the obvious & awesome ATI.

Stay away from ASP pulleys. Absolute junk.

1killer_SS · 12-23-2014, 03:33 AM

Quote:

Originally Posted by Pro Stock John

Powerbond, used, 18K on mine. No charging issues.

The only time I had an issue was at idle for long periods of time, like around twenty min. Stop lights and normal driving, I never had a voltage issue.

MickGIS · 12-23-2014, 05:00 PM

Hey I just read about another option to keep the crank from rotating when removing the old crank bolt and installing the new crank bolt.
This works with a 6 speed manual transmission:

Put the car in 4th gear
Set the park brake
Chock the tires to keep them from rolling

Sounds like a reasonable procedure.

christianchevell · 12-23-2014, 05:47 PM

I went with the more expensive Fluidampr for its quality, and it only under drives one belt, and had local mechanics install it. I have read about a couple failures of the slp balancer /udp with separation.... where as the fluidampr uses fluid and has been making them for a long long time. And if you get the fluidampr the instructions state a belt of such length and then give a gates number that is wrong to get that appropriate length which is the right belt to get//// good luck from a old hot rodder with a big cam, and who wants to make sure vibration is kept down.....

Camarojt · 12-24-2014, 12:45 AM

Quote:

Originally Posted by 1killer_SS

The only time I had an issue was at idle for long periods of time, like around twenty min. Stop lights and normal driving, I never had a voltage issue.

I have a powerbond udp and agree with this ^^! The only other time I had an issue was when I had a huge stereo system and had it crunk up it would obviously pull hard on the charging system. It was over 2000 watts!

MickGIS · 12-27-2014, 04:48 PM

I found the crank torque-to-yield bolt a couple of places:
Speed Engineering - GM LS3 Harmonic Balancer Bolt - $12.09 + shipping
GM Parts Direct - Bolt 11570046 - $7.59 + shipping
GM LS3 Harmonic Balancer Bolt M16 X 2 X 125.75mm - $12.09 + shipping

Anyone have a vendor for this crank torque-to-yield bolt they trust and recommend?

12-15-2014, 02:32 PM	#1
MickGIS Drives: 2010 Camaro 2SS Black,White Stripes Join Date: Nov 2009 Location: Centennial, CO Posts: 129	Experences With Underdrive Pulleys I have read many posts on the pros and cons of underdrive pulleys here and on ModernCamaro and have determined that these two are of interest: Fluidampr Harmonic Damper vs SLP Balancer/Underdrive Pulley What are your experiences with them and why do you prefer one over the other?

12-22-2014, 07:52 AM	#3
Spartan01 Drives: Evil Eva, 2010 2SS LS3 Join Date: Aug 2013 Location: Falls Church, Virginia Posts: 3,600	I have the SLP. Took it to 3 different places, nobody could install it but a GM dealer. I did not notice a difference after the install, but who would notice 3-7 HP on a 400+ HP vehicle? I did get it from Jannetty, with the special. It is a pretty good deal. Installed it this time last year, no issues so far. __________________ "You simply cannot trust quotes found on the internet." -Abraham Lincoln

12-22-2014, 07:13 PM	#4
1killer_SS Drives: 2012 1SS LS3 Join Date: Dec 2014 Location: Ohio Posts: 46	I got my SLP from Marylandspeed, while I dont notice the small HP gains either, they all add up. CAI, headers, Yadda yadda yadda I went for full bolt-ons. and after it was all said and done I certainly noticed the HP increase. I did have to bump up my RPM's to 675 from 550 to keep the electrical system happy. other than that no complaints. The installer wasnt so happy to install it, he said it was a PITA __________________ 2012 1SS LS3 R1 Premiere cross drilled and slotted rotors / Hawk HPS pads / Vitesse Throttle controller, 25% SLP under drive pulley Car had full bolt-ons, however, at the moment the car is at santa's workshop getting getting remodded for an AGP Twin Turbo kit. 421WHP/401WTQ

12-22-2014, 07:36 PM	#5
Jared91 Drives: 2011 Camaro SS/M6 Join Date: Dec 2013 Location: Pennsylvania, 15909 Posts: 180 View My Garage	X2. Install is easy just a huge pain in the balls. __________________ 2011 Ls3. Slp TSV2300. 8PSI. 3.4 Pulley. Livernois Twin Fuel Pump. Id850 Injectors. Slp 1 3/4 headers. CAI Cold Air Intake. 3inch exhaust. V-Maxx portted throttle body. Night Fury cam. Lpe 391 gears. Fj performence tune. 643rwhp 574rwtq

12-22-2014, 07:58 PM	#7
Pro Stock John Writer Drives: 2010 SS / 1967 Camaro Join Date: May 2009 Location: Chicago, IL Posts: 7,216	Powerbond, used, 18K on mine. No charging issues. __________________ PROJECT HEAVY CHEVY Camaro Now: Mods for the Masses Part I \| Part II 13.15@106 1.95 \| 100% Stock 12.37@112 1.85 \| + Kooks Headers/Cats + 20" 555R + CAI + BW TB + UDP + Tune 12.06@113 1.70 \| + CD 3200 + 18" NT05R + RCR Intake + NE OTR + GPI Tune 11.84@115 1.59 \| + 3.91s + Race Star 17x7 Fronts 10.90@125 1.47 \| + GPI VVT Cam + BW Ported Heads + CD 3800

12-22-2014, 08:06 PM	#8
EmeryZ28 Drives: 2011 Camaro 2SS/RS LS3 Join Date: Aug 2013 Location: Tampa Bay Posts: 812	Back in the day I installed a set of March underdrive pulleys on a TPI motor. This was the alt pulley, water pump and crank. I installed them along with a hypertech chip and a BBK TB. I noticed a nice butt dyno increase. Ever since I moved on to LSx cars, I have heard nothing but mixed reviews and lots of bitching about the install. In my opinion, from the intel I have gathered, I feel that an underdrive pulley is last in line amongst the other bolt ons. __________________ 2015 Silverado Z71 6.2/2011 Camaro 2SSRS LS3/2014 Cadillac ATS 2.0T

12-22-2014, 11:35 PM	#9
Josh @ Spartan LSX Drives: A wrench Join Date: Jan 2010 Location: East Atlanta Posts: 353	SLP / Powerbond pulleys are the same pulley, and the only one I'd recommend accept the obvious & awesome ATI. Stay away from ASP pulleys. Absolute junk.

12-23-2014, 05:00 PM	#11
MickGIS Drives: 2010 Camaro 2SS Black,White Stripes Join Date: Nov 2009 Location: Centennial, CO Posts: 129	Hey I just read about another option to keep the crank from rotating when removing the old crank bolt and installing the new crank bolt. This works with a 6 speed manual transmission: Put the car in 4th gear Set the park brake Chock the tires to keep them from rolling Sounds like a reasonable procedure.

12-23-2014, 05:47 PM	#12
christianchevell old school chevy rodder Drives: 2013 2SS/RS Manual,DM exhaust,CRT Join Date: Jul 2012 Location: Oregon Posts: 5,587 View My Garage	I went with the more expensive Fluidampr for its quality, and it only under drives one belt, and had local mechanics install it. I have read about a couple failures of the slp balancer /udp with separation.... where as the fluidampr uses fluid and has been making them for a long long time. And if you get the fluidampr the instructions state a belt of such length and then give a gates number that is wrong to get that appropriate length which is the right belt to get//// good luck from a old hot rodder with a big cam, and who wants to make sure vibration is kept down..... __________________ 2021 Wild Cherry ZL1 A10, Sunroof, Data, Carbon, Nav, RotoFab Dry CAI, Elite x2, Borla ATK, Driveshaft shop

12-27-2014, 04:48 PM	#14
MickGIS Drives: 2010 Camaro 2SS Black,White Stripes Join Date: Nov 2009 Location: Centennial, CO Posts: 129	Vendor For A Crank Torque-to-Yield Bolt I found the crank torque-to-yield bolt a couple of places: Speed Engineering - GM LS3 Harmonic Balancer Bolt - $12.09 + shipping GM Parts Direct - Bolt 11570046 - $7.59 + shipping GM LS3 Harmonic Balancer Bolt M16 X 2 X 125.75mm - $12.09 + shipping Anyone have a vendor for this crank torque-to-yield bolt they trust and recommend?