Belt length for 10% lower and stock upper

ChadSZL1 · 07-22-2022, 10:28 AM

Does anyone have the info for a gates belt for 10% lower and stock upper? Should I use the HD belt form gates or the rpm belt? Any help would be appreciated. I looked online and here and can’t get a confident part#.

ZLRob · 07-22-2022, 11:04 AM

What size is that, an 8.8" pulley? You gotta be more specific on the sizes and stuff to get a more accurate recommendation or even a recommendation at all.

ChadSZL1 · 07-22-2022, 11:07 AM

Yes it’s an ATI 8.8 lower

ZLRob · 07-22-2022, 12:40 PM

I just need to confirm. This 8.8 pulley is for the supercharger drive correct?

ChadSZL1 · 07-22-2022, 12:53 PM

Yes it’s the super charger driver pulley that mounts to the crank

ZLRob · 07-22-2022, 01:02 PM

I can see how you're having trouble finding the right belt for it. Do you know the original supercharger pulley size by chance? I know those run a K080828 belt which is effectively lengthed at 82.80".

ZLRob · 07-22-2022, 01:22 PM

You know what. The ATI 8.6 pulleys use a K080839 belt so that should work on yours as well given the 8.6 pulley is literally just .2" smaller than yours. I would pick one of those up in the RPM size and you'll be set to go.

grampa_ss · 07-22-2022, 01:58 PM

Just an FYI...Regarding the RPM belt...do your research. These belts do not stretch. Do not over tension. I have no belt slip issues now.

ZLRob · 07-22-2022, 03:03 PM

Quote:

Originally Posted by grampa_ss

Just an FYI...Regarding the RPM belt...do your research. These belts do not stretch. Do not over tension. I have no belt slip issues now.

This issue only affects vehicles with manual tensioners. The ones which come to mind are the early Terminator Mustangs of yesteryear which used a manual set tensioner. Spring loaded tensioners like ours are not an issue as long as you get the right size.

Granted, any belt is capable of snapping, but that is an inherent risk of running belts in the first place.

grampa_ss · 07-22-2022, 03:40 PM

Got it. My Procharger tensioner is manual. I just snugged it up.

ZLRob · 07-22-2022, 04:46 PM

Quote:

Originally Posted by grampa_ss

Got it. My Procharger tensioner is manual. I just snugged it up.

If I remember right I think Gates came out some literature that said the RPM belts need no more than 30% tension with a manual and 50% tension on their Fleetrunner.

Pros and Cons. I sort of wish we had a manual but the spring loaded ones are super convenient too. Grass is always greener right? Lol.

Crusher Camaro · 07-22-2022, 05:02 PM

I have a the AIT damper 8.650, its the 8% overdrive pulley.
8 Rib, 84 3/8
think the napa number was 25-080839HD

Evansa22 · 07-22-2022, 05:15 PM

I believe the 39 was the same belt I used with an 8.8 lower, stock upper

ChadSZL1 · 07-22-2022, 06:10 PM

Thanks guys. I actually had the 8.8 ATI which is for the corvette dry sump and won’t work. I ordered the 8.6 and I have a stock upper so I assume the belt I need is the 25-080839HD.

07-22-2022, 10:28 AM	#1
ChadSZL1 Red Bull Drives: 2017 Chevy ZL1 Join Date: Dec 2020 Location: Evansville, IN Posts: 186	Belt length for 10% lower and stock upper Does anyone have the info for a gates belt for 10% lower and stock upper? Should I use the HD belt form gates or the rpm belt? Any help would be appreciated. I looked online and here and can’t get a confident part#.

07-22-2022, 11:04 AM	#2
ZLRob Super Stock Drives: Chevrolet Camaro ZL1 Join Date: May 2022 Location: Concordia Posts: 964	What size is that, an 8.8" pulley? You gotta be more specific on the sizes and stuff to get a more accurate recommendation or even a recommendation at all. __________________ 2017 Red Hot ZL1 A10 - Apex ARC-8's, 305/ 325 PS4's, DSX 9.06 12% lower, Griptec OE upper, NGK HR7 Ruthenium plugs, Nostrum 25+ injectors, XDI Goliath HPFP, Katech dual in tank LPFP, Katech oil pump, LME tensioner, DOD delete, LT1 big fuel cam, Jokerz ported blower, MPI lid, GMS hood extractor bracket, Granatelli SS plug wires, Cordes LTR reservoir, DMS T-stat housing, 186* LS3 T-stat, Borla X pipe, Black Widow Angry Housewife/ Corsa NPP mufflers, BMR engine mounts, Banks iDash, Lithium Battery, AEM X- Series, HP Tuners, E85, 16.5 psi 758 HP/ 804 TQ

07-22-2022, 12:40 PM	#4
ZLRob Super Stock Drives: Chevrolet Camaro ZL1 Join Date: May 2022 Location: Concordia Posts: 964	I just need to confirm. This 8.8 pulley is for the supercharger drive correct? __________________ 2017 Red Hot ZL1 A10 - Apex ARC-8's, 305/ 325 PS4's, DSX 9.06 12% lower, Griptec OE upper, NGK HR7 Ruthenium plugs, Nostrum 25+ injectors, XDI Goliath HPFP, Katech dual in tank LPFP, Katech oil pump, LME tensioner, DOD delete, LT1 big fuel cam, Jokerz ported blower, MPI lid, GMS hood extractor bracket, Granatelli SS plug wires, Cordes LTR reservoir, DMS T-stat housing, 186* LS3 T-stat, Borla X pipe, Black Widow Angry Housewife/ Corsa NPP mufflers, BMR engine mounts, Banks iDash, Lithium Battery, AEM X- Series, HP Tuners, E85, 16.5 psi 758 HP/ 804 TQ

07-22-2022, 01:02 PM	#6
ZLRob Super Stock Drives: Chevrolet Camaro ZL1 Join Date: May 2022 Location: Concordia Posts: 964	I can see how you're having trouble finding the right belt for it. Do you know the original supercharger pulley size by chance? I know those run a K080828 belt which is effectively lengthed at 82.80". __________________ 2017 Red Hot ZL1 A10 - Apex ARC-8's, 305/ 325 PS4's, DSX 9.06 12% lower, Griptec OE upper, NGK HR7 Ruthenium plugs, Nostrum 25+ injectors, XDI Goliath HPFP, Katech dual in tank LPFP, Katech oil pump, LME tensioner, DOD delete, LT1 big fuel cam, Jokerz ported blower, MPI lid, GMS hood extractor bracket, Granatelli SS plug wires, Cordes LTR reservoir, DMS T-stat housing, 186* LS3 T-stat, Borla X pipe, Black Widow Angry Housewife/ Corsa NPP mufflers, BMR engine mounts, Banks iDash, Lithium Battery, AEM X- Series, HP Tuners, E85, 16.5 psi 758 HP/ 804 TQ

07-22-2022, 01:22 PM	#7
ZLRob Super Stock Drives: Chevrolet Camaro ZL1 Join Date: May 2022 Location: Concordia Posts: 964	You know what. The ATI 8.6 pulleys use a K080839 belt so that should work on yours as well given the 8.6 pulley is literally just .2" smaller than yours. I would pick one of those up in the RPM size and you'll be set to go. __________________ 2017 Red Hot ZL1 A10 - Apex ARC-8's, 305/ 325 PS4's, DSX 9.06 12% lower, Griptec OE upper, NGK HR7 Ruthenium plugs, Nostrum 25+ injectors, XDI Goliath HPFP, Katech dual in tank LPFP, Katech oil pump, LME tensioner, DOD delete, LT1 big fuel cam, Jokerz ported blower, MPI lid, GMS hood extractor bracket, Granatelli SS plug wires, Cordes LTR reservoir, DMS T-stat housing, 186* LS3 T-stat, Borla X pipe, Black Widow Angry Housewife/ Corsa NPP mufflers, BMR engine mounts, Banks iDash, Lithium Battery, AEM X- Series, HP Tuners, E85, 16.5 psi 758 HP/ 804 TQ

07-22-2022, 11:07 AM	#3
ChadSZL1 Red Bull Drives: 2017 Chevy ZL1 Join Date: Dec 2020 Location: Evansville, IN Posts: 186	Yes it’s an ATI 8.8 lower

07-22-2022, 12:53 PM	#5
ChadSZL1 Red Bull Drives: 2017 Chevy ZL1 Join Date: Dec 2020 Location: Evansville, IN Posts: 186	Yes it’s the super charger driver pulley that mounts to the crank

07-22-2022, 01:58 PM	#8
grampa_ss Drives: 2016 Camaro 2SS Join Date: Apr 2017 Location: Stansbury Park, Utah Posts: 1,102	Just an FYI...Regarding the RPM belt...do your research. These belts do not stretch. Do not over tension. I have no belt slip issues now. __________________ 2016 2SS, MRC, NPP, A8. Procharger P-1X,Stage II,std bypass, 3.9, Alky Meth - 10.84 @129 - DA+2000 New Mods - GPI drop ins, Kooks 2", LT4 fueling, Cam, Circle D Converter, 3.5 pulley & dual nozzle meth.

07-22-2022, 03:40 PM	#10
grampa_ss Drives: 2016 Camaro 2SS Join Date: Apr 2017 Location: Stansbury Park, Utah Posts: 1,102	Got it. My Procharger tensioner is manual. I just snugged it up. __________________ 2016 2SS, MRC, NPP, A8. Procharger P-1X,Stage II,std bypass, 3.9, Alky Meth - 10.84 @129 - DA+2000 New Mods - GPI drop ins, Kooks 2", LT4 fueling, Cam, Circle D Converter, 3.5 pulley & dual nozzle meth.

07-22-2022, 05:02 PM	#12
Crusher Camaro Drives: 19 ZL1 Join Date: Jan 2019 Location: Tampa Fl Posts: 101	I have a the AIT damper 8.650, its the 8% overdrive pulley. 8 Rib, 84 3/8 think the napa number was 25-080839HD

07-22-2022, 05:15 PM	#13
Evansa22 Drives: 2018 HBM ZLE Join Date: Aug 2017 Location: In the garage Posts: 885	I believe the 39 was the same belt I used with an 8.8 lower, stock upper

07-22-2022, 06:10 PM	#14
ChadSZL1 Red Bull Drives: 2017 Chevy ZL1 Join Date: Dec 2020 Location: Evansville, IN Posts: 186	Thanks guys. I actually had the 8.8 ATI which is for the corvette dry sump and won’t work. I ordered the 8.6 and I have a stock upper so I assume the belt I need is the 25-080839HD.

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