ROUSH 2018 PULLEY PROBLEMS AND ALTITUDE

[MAXFAST]

Hi there I have some problems
Car runs good no problems but I live in a city 2500 meters above sea level and car feels not like it was meant to be by loosing about -4 psi on blower pressure
So I checked on VMP page a smaller pulley to compensate
Just 2.8 + 2 psi
Then I see a page named zpgriptec
Very nice guys
And buy a 2.7 pulley +3 psi and ordered one
Started to change the pulley
And here starts the problem won’t fit my blower the nose drive is not machined very big diameter
So I have two choices
Stick with 2.8 VMP and live with -2 psi
Or machine the nose drive blower to fit 2.7 -1 psi
The other problem I have I don’t want to screw my car
So if I use any of the pulleys and stick with compensating the most I can from my altitude do I will damage my car.? Need a retune ?
I don’t want to go and retune my car because here where I live all the performance shops are a scam

so I prefer to just do a nice setup of pulleys and buy the roush stage 2 package upgrade
What can anyone recommend
Buy a crank pulley with another diameter for more psi on blower
Machine te the nose ?
Buy a 8/10 rib kit to see if I can fit a lower pulley ?

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[Jackson1320]

Overdrive balancer is the easiest. Don’t machine your blower

 

[Cory S]

OD Damper would be best.

 

[hlfbkd420]

I personally wouldn't be pulleying down on a 2018 Roush kit. Kit already gets heatsoaked. Are you sure that isn't why your loosing boost at WOT? Start by logging your IAT2's. I live in AZ. At the 1/8th mile in the summer heat my throttle blade starts closing and the boost is a lot lower when I hit the traps.

If you decide to pulley down this kit, I wouldn't do it without running e85 and having some supporting mods.

 

[engineermike]

Dude’s at 1.5 mile elevation….needs another 3.7 psi just to get to base sea level boost.

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