anyone interested in diff btween s475 vs s465
anyone interested in diff btween s475 vs s465 i have a 5.3 silverado single cab with a front mount s475 T6 1.10A/R and i could only foot brake maybe 1psi with a 3200 converter. it took maybe 300feet before it would make full boost (10psi) and break the tires loose, anything before 300 feet it wouldnt do anything until the full 10psi came in. today i received my s465 and put it on my truck. right away i felt a difference in drive-ability. i foot braked it to about 2psi on the street with 325/50 MT drag radials and as soon as i let go of the brake its gently started spinning the tires and eventually just got out of control and hit full boost within 30 feet! i would say it is a verry noticeable difference and it still hits as hard as the s475!
here are the specs of the two turbos
s475
Compressor Wheel Inducer/Exducer 75mm x 100mm
Turbine Wheel Inducer/Exducer 83mm x 74mm
s465
Compressor Wheel Inducer/Exducer 64mm x 91mm
Turbine Wheel Inducer/Exducer 83mm x 74mm
here are the specs of the two turbos
s475
Compressor Wheel Inducer/Exducer 75mm x 100mm
Turbine Wheel Inducer/Exducer 83mm x 74mm
s465
Compressor Wheel Inducer/Exducer 64mm x 91mm
Turbine Wheel Inducer/Exducer 83mm x 74mm
You could build a plate to block of half of one of the two volutes and see if that helps spool without affecting back pressure too much (you should be fine). It would give you something like a .82 a/r. The 75mm compressor wheel should make more in the high rpm range. If you have enough room you could also swap to a t4 housing and run an adapter plate. A quick spool valve would also work wonders.
Most importantly though, insulate all your piping and run a turbo blanket, retaining exhaust heat is the key to spooling the turbo.
Most importantly though, insulate all your piping and run a turbo blanket, retaining exhaust heat is the key to spooling the turbo.
the s465 sould have the same size a/r on the turbine side. I think i've read somewhere Jose from FI.com saying something about when the compressor and the turbine wheels are close to the same size it hurts the spool of the turbo. It had something to do with the s488 that Bullseye sells because it has a 88mm/96mm. Same difference of 8mm in size with the s475 with 1.10 75mm/83mm. Could be the cause but I dont know
the s465 sould have the same size a/r on the turbine side. I think i've read somewhere Jose from FI.com saying something about when the compressor and the turbine wheels are close to the same size it hurts the spool of the turbo. It had something to do with the s488 that Bullseye sells because it has a 88mm/96mm. Same difference of 8mm in size with the s475 with 1.10 75mm/83mm. Could be the cause but I dont know
!! . Our ET-R billet 91mm wheel only weighs 342 grams if that tells you anything 
. 405g's? DAMN! that's almost 0.9Lbs or more than a unopened can of Coke (about 380g)!
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You just need better brakes or 4x4, 
I have a lower stall with a 5.7 ls1 and in 4x4, didn't have much trouble spooling a S480 with the same hot side you have to 6-7psi and I'm up in the clouds at 5000' elevation.
I have a lower stall with a 5.7 ls1 and in 4x4, didn't have much trouble spooling a S480 with the same hot side you have to 6-7psi and I'm up in the clouds at 5000' elevation. You should test it out again with an s472
glad an expert came in lol i was way off
