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 FAQ: Upgrading Serpentine Belts & Pulleys?

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Abaddon
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Sat Jul 13, 2013 10:44 am

Sir Psycho Sexy wrote:
Alright, im thinking i need to pick up a bigger idler pulley... The pulley i have is a 3.2, and i think i ought to be able to run it, but i need a bigger idler, is http://www.oreillyauto.com/site/c/detail/GATE/38019.oap?pt=02733&ppt=C0328 what i need?

Just to clarify, i am putting the motor in the car right now and this issue arose.

I dont know if this is the proper place for this or not... I hope so!

Why not just buy a smaller belt? Buy a Gates K060710 from O'Reilly. That's what I'm running with my 3.25". It's like $35 with a 3 year warranty.
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deekster_caddy
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PostSubject: TeMp   Sat Jul 13, 2013 2:39 pm

I also recommend a smaller belt. The bigger idler will help a little but won't be quite enough for a 3.2.
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AA
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Sat Jul 13, 2013 5:14 pm

You can run a 3.2" with the OEM belt if you increase the diameters of both the idler AND tensioner pulleys. Can even run 3.1" on stock belt. Why do this? Pulleys are much easier to change than belts. If you install a smaller belt, and ever want to go back to 3.4" (like I did), you'll need to change the belt back again, which kinda sucks. Changing the idler/tensioner pulleys is easy, gives you more options, and costs about the same as a belt. Also, you can always replace belt with stock instead of needing to remember a special size.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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Sir Psycho Sexy
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Sun Jul 14, 2013 2:28 am

I already have a 3.5 tensioner pulley. My problem is that with the 3.2 SC pulley, with the 3.5 tensioner, and stock 3.0 idler, the belt is touching itself, not to mention being ridiculously loose.

Reason i didnt just go for a smaller belt was because the pulleys were pretty shot anyway.

I picked up the new pulley today but i havent gotten the chance to put it on. I think it will take care of my problem, though.

Assuming the 3.2 pulley just doesnt work out, can i run a 3.3 or 3.4 on the 3.5" tensioner and idler pulleys with the same belt, or will i need to change one or both of them back? Sorry for all the n00b questions!
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AA
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Sun Jul 14, 2013 5:36 pm

I tested a few different pulley/belt combos a while back. See page 1 for more info. In addition to those options, a shorter belt would also work. Depends on how often you'll be swapping SC pulleys and if you mind changing belts or not.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
Sir Psycho Sexy
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Sun Jul 14, 2013 7:10 pm

The 3.5" idler and tensioner seem to work great with the 3.2" SC pulley. The belt doesnt seem too loose or tight. Yay!
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AA
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Sun Jul 14, 2013 8:57 pm

Cool. Be careful with that 3.2" unless you've got some mods we can't see in your sig.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
96_Juggernaut
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Mon Jul 15, 2013 3:18 am

Ok so I just want to be clear on this. and the original photos are no longer available:

Pulleys 1, 2, and 3 are all the same size ( 3" ) and the only difference is if they are smooth or grooved? and pulley number 4 is visually larger, what size is this one? I plan on changing all pulleys and belts soon.
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Sir Psycho Sexy
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Mon Jul 15, 2013 3:16 pm

I am 99% sure its a 3.5"

AA wrote:
Cool. Be careful with that 3.2" unless you've got some mods we can't see in your sig.

I will update my sig after the car is started for the first time! happy
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charlieRobinson
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Sat Aug 16, 2014 11:30 am

shoot, so for a 3.25" SC pulley, im gonna need a 3.5" idler and tensioner, huh?
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AA
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Sat Aug 16, 2014 8:02 pm

Unless you use a shorter SC belt.

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
matt270avian
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Sat Aug 16, 2014 8:32 pm

charlieRobinson wrote:
shoot, so for a 3.25" SC pulley, im gonna need a 3.5" idler and tensioner, huh?


The idler is off of a Jeep SOMETHING. I want to say it's a Grand Cherokee. If you're friends with the people at a parts store just have them pull it out and measure it. Let me dig around for a bit and I'll find it. it replaces the front most idler. Going from a 3" grooved to a 3.5" grooved.
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charlieRobinson
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Sat Aug 16, 2014 9:32 pm

Anyone have the part number for the 3.5" SC tensioner pulley?
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AA
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Sat Aug 16, 2014 9:44 pm

Part Number: STP-635: http://intense-racing.com/PROD/STP-635.html

or:

Item #: ZZ-6R35SM: http://shop.zzperformance.com/store/p/82-Tensioner-Idler-Pulleys-6rib.aspx

_________________
'98 SC Riviera 268k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch


'05 GTO 49k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun
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http://www.cardomain.com/ride/657082/4
charlieRobinson
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PostSubject: temp   Sun Aug 17, 2014 3:15 pm

Tyler sent it to me.
Gates 38001 for the 3.5" SC tensioner pulley

TThanks, homie
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charlieRobinson
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Sat Nov 29, 2014 11:44 am

Whats the part number for the 3.5" idler pulley? I am not seeing it.

AA, will you please post part numbers in the first post of the thread so they are all in 1 place?

Thank you
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matt270avian
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Sat Nov 29, 2014 11:50 am

http://www.amazon.com/gp/product/B001C9BZC0/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

That's the bigger grooved idler that I'm using right now.
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charlieRobinson
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Sat Nov 29, 2014 12:05 pm

matt270avian wrote:
http://www.amazon.com/gp/product/B001C9BZC0/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

That's the bigger grooved idler that I'm using right now.

Gates 36157 Idler Pulley

Nice. Thank you.
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charlieRobinson
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PostSubject: Re: FAQ: Upgrading Serpentine Belts & Pulleys?   Wed May 20, 2015 7:13 pm

Anyone have belt#s for intercooler setups?

ZZP lists the big cars differently than the others so not exactly sure:

http://shop.zzperformance.com/store/p/155-Serpentine-Belts.aspx
667 - Gen 5 blower stock belt GTP/GS/SS supercharged with stock 3.8" pulley (67 1/4" -1708mm)
663 - Gen 3 blower stock belt GTP/GS/SS supercharged with stock 3.8" pulley (66 7/8")
660 - GTP/GS/SS supercharged with 3.3 - 3.7" pulley (66 3/4")
658 - GTP/GS/SS supercharged with 3.2 - 3.6" pulley (66 3/8" - 1687mm)
653 - GTP/GS/SS supercharged with 3.1 - 3.5" pulley (65 7/8")
650 - GTP/GS/SS supercharged with 2.8 - 3.1" pulley (65 1/2")
645 - GTP/GS/SS supercharged with 2.6 - 2.8" pulley

716 - Bonneville SSEi, Park Ave, or Riviera with a 3.4" pulley
721 - Bonneville SSEi, Park Ave, or Riviera with stock supercharger pulley (72 5/8" 1845mm)
(Riviera/Bonneville/Park Ave use same length belts)

Stage 2 or 3 Intercooler
685 - 3.3"+
680 - 2.90" - 3.20"
675 - 2.6" - 2.8"
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FAQ: Upgrading Serpentine Belts & Pulleys?
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