Roush Supercharged S650 Pulley Swap

[Kinesthetic]

Hi All,

Good evening! Just found this forum after lurking in the Mustang Discord/Subreddit for a while - hoping to solicit input from those more knowledgeable than me . Specifically, if anyone knows how small of a pulley I can safely run and not risk things going snap, crackle, pop? This will likely be the final upgrade before scheduling a tune once the weather cools off here in AZ (pulley swap and tune to take place at the same time). I do not track this car.

I do plan on using shell/chevron 91 octane and will be adding 32oz of torco accelerator to every tank, effectively reaching 95 octane.
Current dyno numbers with octane booster: 690 lowest / 705 highest
Current dyno numbers without octane booster: 651 lowest / 661 highest

Current mods:
I have some suspension work done (stop the hop kit, springs, struts, end links, sway bars), upgraded half-shafts, and a Roush limited edition Supercharger. I have a differential cooler, an engine oil cooler, and a metal transmission pan that adds a quart or two of capacity. Added 2 oil catch cans. I am still on a stock 2-piece driveshaft. Oh, and I am running 315 tires in the rear, 285’s in the front.

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[Q6543]

Nice , the only person I know who has worked on roush cars is Brent at brenspeed, look them up and call him, or go through his YouTube channel, he did a few pulley swaps on roush blower cars to try and break 9s

Edit… here you go

 

[RLE55]

Impressive, popping lids off you gain 5 extra hp....hmmmm

 

[Q6543]

On the dyno… I think it hurts at the track..

 

[Puddinpop]

Ortiz Performance is also working on one. It's on their Facebook page.

 

[Kinesthetic]

Awesome. Just left a message with brenspeed, will call Ortiz as well.

Im now trying to figure if its worth upgrading the differential (im thinking eaton trutrac) and the driveshaft (aluminum single body) before I pulley swap.

...or say heck with it and just call it good with the 84mm pulley + tune.

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