slowlsx

iTrader: (26)

when did you see full boost with the s475 and 1.10 ar? whats your set up? im running a stock bottom end 6.0 as well with a s475 but a 1.32 AR

droppedchev

iTrader: (5)

I seen full boost right around 3200 rpm with my 6l looks just like a kbracing set up but I have a 3.5 dp into 4in exhaust z06 cam stock heads I was running 14 psi

slowlsx

iTrader: (26)

thats pretty good for a big turbo. i need to finish up the tuning and see were i see full boost at with this big housing. if anything ill just upgrade to the 480 with 1.10 ar since i plan to go with a bigger motor soon! what are your plans as far as the 408 and what internals are you using? considering a 408 aswell

droppedchev

iTrader: (5)

I'm picking up a kit from Texas speed everythings forged I'm upgrading the rods and pistons to better ones including the bearings and balanced there kits are priced pretty good I believe it's a eagle crank I'm going with scat h beam rods and weisco pistons compression should be right around 9.5 to 1

OnyxSilveradoSS

iTrader: (4)

I would look into opening up the DP to 4" to the exhaust.
how big are your injectors?

droppedchev

iTrader: (5)

I don't have the room for a 4 inch dp I'm running 73# injectors With twin 255s

hellbents10

iTrader: (10)

Well it sounds like you have the 83mm turbine wheel. It will have some very high back pressure on the 408 on 14psi. The 1.32 a/r units have the 96mm turbine wheel witch would work great on the 408.

droppedchev

iTrader: (5)

Well I don't have the money and I already have the turbo so it's going to have to work or change the housing

droppedchev

iTrader: (5)

Well pulled the motor apart number 7 crapped out and took a chunk out of the piston so looks like the cylinder is good so it's getting forged rods and pistons and getting put back in