Wondering if its safe to run a smaller pulley at a higher elevation, i am wondering this because when i was closer to sea level i could hit 13 psi, but now i am home and i can only hit 11 (maybe) more like 10 psi. so if i was hitting a higher psi with more dense air, couldn't i run a smaller pulley to make up the difference and still be okay assuming the fuel was there? if so what size would you suggest... I am thinking it will be fine but wanted some input before i get more greedy.

 

I dont see a problem with that, I do it just with a wastegate spring. I have a 11.6 psi spring, and know there about a 3-3.5psi drop so Im just making up for some missing boost.

 

do you see around 8 lbs often with that spring?

 

on the street yeah, on the dyno different story for some reason

 

less on the dyno i assume..

 

Are we mixing apples & oranges here: glenmoormax was asking about using a smaller pulley on a SC to bring the boost back up to what he was experiencing at sea level (which is the normal compensating measure). I presume that by the reference to a wastegate spring that wunfstmax is using a turbo.
About a 20-25% reduction in standard air density is normal at the (I'm guessing)5000 feet of elevation you have there in South Jordan

 

well, i understood what he was meaning about his wastegate spring/turbo... although i figure if he was doing the same thing as me, trying to compensate for lost boost with a higher psi rated spring, then i should also have the same affect. i am headed up a canyon to about 9k feet to see any difference if any by being up another 4500 ft.

 

In real simple terms, the higher you go elevation-wise, the thinner the air and the faster the SC is going to have to be turning to achieve boost pressures comparable to what you'd achieve at lower elevations. I haven't researched it (nor do I paln to), but the answer (if anyone's yet invented one) would a variable-diameter pulley for the SC.

 

Be sort of like a CVT app for a blower...would be interesting, though likely not very easy to design.

 

I have been searching for a belt to fit the 2.62 pulley, but can't find the part number for the gatorback, is it the same belt for the 2.87?

 

If you do take that pulley off make sure you use red lock tight on the pulley bolt and washer when reinstalling... Thats not the original bolt or washer and you dont want that coming loose! You will need 2 sockets, 1 for the impeller bolt and 1 for the pulley bolt(so it doesnt just spin). I would look into the cooler air method first though.. Cooler denser air! Smaller pulley= more heat, more wear, over spin more stress . I would do headers and a new muffler! That muffler is only 2 1/4 inch, the cat back is 2 1/2...or a cut out...
Jumping to another pulley with out cooler air or a bigger exhaust isnt going to help you much. Stuffn it with hotter air that cant escape fast enough isnt gonna be good

 

with the air already being 30 degrees now I know the performance is better, I can feel it, but I am still dumping fuel in there to feed that 13 psi you were hitting.. I will retune of course, and I think I am going to do the open cut out method.