Stretch belt does not change the span between pulleys. The resonance is associated with a narrow rpm band. The belt coming off is modulated by how much time you spend in the resonant rpm range.
It comes down to risk and knowing it will happen again. Next time you get lucky again and you only lose a belt. Or karma rises, the belt is thrown breaking the pulley on the ac pump and taking out the cam position sensor with a potential of a flatbed ride.
9.5 RPM (Red Passion Metallic)
Sport /Premium
"If the women don't find you handsome, they should at least find you handy"-Red Green
I was always throwing my belt, all I did was put on one size shorter and it has never came off in 30,000 miles since. Cheap and effective. Goodyear Gatorback is what I used.
08 G8 GT: MagnaCharger TVS MP1900 10psi, LS9 cam, 72# injectors, Roto-Fab CAI, SLP Headers, Corsa Catback, etc.
My Garage
Well, I should have looked at signatures. My comments are with respect to stock l76. Once cam change/blower etc added the resonance may change.
IMHO, the dual bracket remains best bet against the belt coming off.
I also believe if you have a stock dampener with mongo wobble, it only helps the belt to jump.
9.5 RPM (Red Passion Metallic)
Sport /Premium
"If the women don't find you handsome, they should at least find you handy"-Red Green
I threw my belt about 10 times before I ordered the bracket. The day before I got it the belt threw and broke the AC pulley. Can't buy just the pulley so I got to swap the compressor for $600 too. I can rev 7k ice cold now but wish I had done the bracket sooner.
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I see that Karo at HoldenpartsUSA has the new tensioner and belts.
RIP Charlie, The GRRRR8 One
[SIZE="2"][COLOR="Red"]
2009 G8 GXP, #715 0f 1829 (one of 38 as optioned), MSM, M6, Sunroof, Onyx/Red (sold)
2009 G8 GXP, #807 of 1829, MSM, A6, sunroof
2016 Chevy SS, Mystic Green, roof, spare, #555 of 2221.
You can push the envelope, but it's still stationery
I put on a new tensioner in August. It's been holding fine since then.
09 G8 GT SRM Premium Sport Sunroof
HSV GTS Triple Gauge Pod, GXP Rear Sway Bar and Diffuser, HSV SuperSport Steering wheel, SOLO axle-backs, Magnaflow cats, Red Hot Shift Knob, Auto-dim Mirror, Hood Vent Mod, Removed Intake Cover, Rotofab CAI, Cortex, Infinity door speakers, MTX Re-Q5, Pioneer Amp & RF Sub, LED lows & fogs, Spyder tails, Power Slot rotors, Wagner Thermoquiet pads, Chrome lug covers, Glovebox light,
Winter-wear:
Bremmerkraft BR09 winter wheels, Weathertech floor liners, oil pan heater
Admin: www.pontiacbonnevilleclub.com
I just replace both belts every 2 years. Not that much cost.... And takes all of 25 minutes to do
08 GT MGM Onyx/Red Premium
Winter 225/55/17
Summer 245/40/19
Kook Mids, Green Cats and Solo Mach Unbalanced
RotoFab
Maverick Man CF Spoiler
Tuned by East Coast Superchargers
What size beltOriginally Posted by norm8332
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A tensioner costs more than a belt, but a lot less than that add-on idler thing.
09 G8 GT SRM Premium Sport Sunroof
HSV GTS Triple Gauge Pod, GXP Rear Sway Bar and Diffuser, HSV SuperSport Steering wheel, SOLO axle-backs, Magnaflow cats, Red Hot Shift Knob, Auto-dim Mirror, Hood Vent Mod, Removed Intake Cover, Rotofab CAI, Cortex, Infinity door speakers, MTX Re-Q5, Pioneer Amp & RF Sub, LED lows & fogs, Spyder tails, Power Slot rotors, Wagner Thermoquiet pads, Chrome lug covers, Glovebox light,
Winter-wear:
Bremmerkraft BR09 winter wheels, Weathertech floor liners, oil pan heater
Admin: www.pontiacbonnevilleclub.com
Goodyear Gatorback 4040425 is what I used.
Last edited by norm8332; 03-05-2018 at 05:43 PM.
08 G8 GT: MagnaCharger TVS MP1900 10psi, LS9 cam, 72# injectors, Roto-Fab CAI, SLP Headers, Corsa Catback, etc.
My Garage
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