Upper pulley or lower pulley???

[Mulletdaddee72]

Curious as to what y’all think about doing a lower overdrive pulley as opposed to the smaller upper pulleys as a solution for extra boost. This would allow to keep the clutch pulley for the blower itself and not risk any damage that getting rid of the clutch could possibly incur. VMP has already done this with their predator swapped car and got an extra 4 psi from the 20% overdrive pulley.

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[AMBJR]

Curious as to what y’all think about doing a lower overdrive pulley as opposed to the smaller upper pulleys as a solution for extra boost. This would allow to keep the clutch pulley for the blower itself and not risk any damage that getting rid of the clutch could possibly incur. VMP has already done this with their predator swapped car and got an extra 4 psi from the 20% overdrive pulley.

I would go with a 15-25% lower pulley if they were available!!! I would upgrade to a 10 RIB pulley too!!!

 

[VooDoo387R]

Personally I would go with an upper pulley for the simple reason that it's easier to change out/upgrade pullies in the future. I think it just depends on what your goals for the car are as far as desired power levels. Would you be happy with a CAI, pulley and tune? Or are you going to go down the power rabbit hole?

 

[LethalPerformance]

The lower takes modification to fit as theres some clearance issues. It's way easier and less expensive just to do the upper. I also wouldn't be too concerned about removing the clutch style pulley. This is only something they started doing in the recent years for the Hellcat and now the GT500. Every other supercharged car Ford has built that comes to mind before this one (99-04 lightnings, 03-04 cobra, 07-14 gt500) didn't have that style pulley and we've never seen any type of failure or issue from not running the clutch style pulley. I'm sure it can be debated just like everything else but from what I was told the main reason they went with the clutch style pulley on the new GT500 was to keep blower noise down at idle.

 

[V00D00]

The lower takes modification to fit as theres some clearance issues. It's way easier and less expensive just to do the upper. I also wouldn't be too concerned about removing the clutch style pulley. This is only something they started doing in the recent years for the Hellcat and now the GT500. Every other supercharged car Ford has built that comes to mind before this one (99-04 lightnings, 03-04 cobra, 07-14 gt500) didn't have that style pulley and we've never seen any type of failure or issue from not running the clutch style pulley. I'm sure it can be debated just like everything else but from what I was told the main reason they went with the clutch style pulley on the new GT500 was to keep blower noise down at idle.

I had the same questions and got the same answer/results. Id suggest doing upper pulley as well.

Lower is too much work, and a +4psi doesnt leave a whole lot of room later mod combinations

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