Whipple pulley question

[Jdown]

Morning all, was wondering if anyone knows if it's safe to run a 3.750 pulley with stock balancer size without doing any other mods besides a stage 2 Whipple kit? Having a problem with belt slippage and being out of adjustment with the belt that came with kit so going to upgrade to a grip tech so if I can get away with a little more boost why not right.

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[beefcake]

You can run the 3.750 without an issue. Let me know if i can help get you setup with what you need

 

[DougS550]

Morning all, was wondering if anyone knows if it's safe to run a 3.750 pulley with stock balancer size without doing any other mods besides a stage 2 Whipple kit? Having a problem with belt slippage and being out of adjustment with the belt that came with kit so going to upgrade to a grip tech so if I can get away with a little more boost why not right.

Totally safe. The Stock Crank Harmonic Balancer is 6.780 OD with a 3.75 OD blower pulley equates to around 14,102 blower RPM. Is the belt tensioner set to around 80%?
Good luck

 

[robvas]

Totally safe. The Stock Crank Harmonic Balancer is 6.780 OD with a 3.75 OD blower pulley equates to around 14,102 blower RPM. Is the belt tensioner set to around 80%?

I'm assuming he was worried about handling the extra lb of boost on pump gas and his existing tune

 

[DougS550]

I'm assuming he was worried about handling the extra lb of boost on pump gas and his existing tune

Gotcha. That is the upgraded pulley I went with my stage 2 kit. I ran it easily on pump 93 with a little boostane just for extra piece of mind.

 

[Jdown]

I'm assuming he was worried about handling the extra lb of boost on pump gas and his existing tune

Yes sir that's what my concern was as I didn't want to push things to the breaking point.

 

[Jdown]

Totally safe. The Stock Crank Harmonic Balancer is 6.780 OD with a 3.75 OD blower pulley equates to around 14,102 blower RPM. Is the belt tensioner set to around 80%?
Good luck

Thank you Doug for sharing this as I haven't heard of this before but I understand it completely now

 

[stang17]

Morning all, was wondering if anyone knows if it's safe to run a 3.750 pulley with stock balancer size without doing any other mods besides a stage 2 Whipple kit? Having a problem with belt slippage and being out of adjustment with the belt that came with kit so going to upgrade to a grip tech so if I can get away with a little more boost why not right.

So on my conservative 93 octane (no additives) 16.5 timing tune and revving to less than 7,500 rpm car made this with a 3.75, 3.625, and 3.5 pulley.

This is with Kooks 1 7/8, GESI HO Green Cats, and AWE touring catback.

2.9 whipple 11:1 compression gen 2 aluminator.

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