Here's a good thread that should answer that question pretty well...
https://www.performancetrucks.net/fo...d.php?t=404647

 

up the boost. You'll be happier

 

 

It just depends on where you are in your efficiency range. With my 6.0, and t66 going from 6-10psi was a HUGE difference, but I gained nothing from 10-12psi. Just by swaping over to the T76 even at the same 12psi I gained big power. The T76 leaned out my AFR from below 10 to 11.2, at the same 12psi. That just shows one turbo is out of it's range, and the other is just right. Seems like the T76 is done around 15PSI. I think you might have a nice gain going from 6 to 8psi. I don't know where that blower will run out of breath but I would think 10psi would be spinning it pretty hard.

 

thanks for the info i guess i will get a 2.7 pulley not sure if the 2.8 will do it on a stock 6.0 i think a 2.8 is a 9psi?

 

you asked about meth above. you need a radix guy to post up on this but i think you start needing that stuff above 9psi. that what i have seen on other intercooled truck set ups.

 

Ive got an extra 2.75" pulley I pulled off my radix if your interested.

 

if i see 6psi with a 3.0 what should i see with 2.75?

 

If I read right, it will be 2psi more

 

it takes 2 tenths to gain 1 psi. so a 3.0 to a 2.75 will more than likely gain you nothing but belt slip.