PULLEY FOR 2650 ROUSH

[BAKER]

Hello everyone,
i need an advice i have have a Roush RS3 2019 tune to 91 650whp
1st why many of mustang S550 swap to small?
2nd any recommendation what i suppose to buy.

thx
baker

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[Cory S]

#1 more power.
#2 greed.
#3. It’s more fun.
All of them have caveats.

 

[m3incorp]

Don't forget you will need a tune to go along with that smaller pulley to take advantage of the psi increase.

 

[m3incorp]

Figure out what changes you intend to make, and after those changes are made, get the tune....otherwise, you find yourself paying for a tune a couple or more times.

 

[Cory S]

Don't forget you will need a tune to go along with that smaller pulley to take advantage of the psi increase.

9/10 you don’t on our platforms. The benefit of closed loop fueling and MAF sensors together. Targeted Lambda will not change as long as fuel trims can stay within range.

 

[m3incorp]

So you are saying no reason to move from the stock Roush tune to get more power from that smaller pulley? I would think someone moving to a smaller pulley is looking to get more power and getting the most power typically means moving away from the stock Roush tune. I could be wrong and if so, I stand corrected.

9/10 you don’t on our platforms. The benefit of closed loop fueling and MAF sensors together. Targeted Lambda will not change as long as fuel trims can stay within range.

 

[Cory S]

So you are saying no reason to move from the stock Roush tune to get more power from that smaller pulley? I would think someone moving to a smaller pulley is looking to get more power and getting the most power typically means moving away from the stock Roush tune. I could be wrong and if so, I stand corrected.

My apologies. I didn’t catch the “go along with the smaller pulley” lol. Was thinking he just wanted to drop a pulley size. Agree a custom tune upgrade with a smaller pulley absolutely. That’s a win.

 

[engineermike]

I wouldn’t increase boost on a Roush setup on 91. It’s already running quite high for pump gas and the poor intercooler will fall even farther behind.

 

[Red5.0]

Custom tune alone will wake it up.

 

[Goterr0r]

You will want a tune if you pulley down on a Roush blower. And 93 octane will be a must. I would put a tune from someone like PBD or Wengard before you pulley down. After i tuned my phase 2 it was a pretty dramatic difference in power and drivability.

 

[Stephen@lethal]

Hello everyone,
i need an advice i have have a Roush RS3 2019 tune to 91 650whp
1st why many of mustang S550 swap to small?
2nd any recommendation what i suppose to buy.

thx
baker

Smaller pulley spins the blower faster which in turn makes more power. Typically on an efficient setup, you could expect to see around 20-25whp per pound of boost picked up in good weather. I would highly recommend a Griptec pulley as they have rib technology that helps prevent belt slip. Also depending on how much power you're trying to make, you will want a custom tune as well as more boost will require tuning. If you have any questions, feel free to shoot us a message anytime.

https://www.lethalperformance.com/search/?q=griptec+roush

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