slowlsx

iTrader: (28)

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

mike13

iTrader: (27)

Does the S465 have the same size turbine A/R? If it does it's interesting that going with a smaller compressor wheel helps spool.

Zombie

iTrader: (2)

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.

Gonoma

iTrader: (15)

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

DrTurbo

iTrader: (3)

The problem with the 488 that Jose was mentioning was the 488 some people are building using the S500 compressor wheel. That wheel weighs 405 grams !! . Our ET-R billet 91mm wheel only weighs 342 grams if that tells you anything .

DrTurbo

iTrader: (3)

The 65 will spool quicker due to being much lighter, but it only flows 80lbs/min vs the 75 flows 100lbs/min. So about 200hp difference.

Zombie

iTrader: (2)

405g's? DAMN! that's almost 0.9Lbs or more than a unopened can of Coke (about 380g)!

mike13

iTrader: (27)

I learn something new everyday, I would have not considered the weight difference of different wheels to have much of a difference.

cjmatt

iTrader: (4)

also have to take in the inertia of a larger radius wheel. the closer the weight is to the hub, the faster you can accelerate it

kbracing96

iTrader: (25)

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.

slowlsx

iTrader: (28)

http://www.youtube.com/watch?v=ZDMCYS_CQsg

cjmatt

iTrader: (4)

I had a 6.0 Grand national with an S475 and it spooled exactly like your S475...

You should test it out again with an s472

slowlsx

iTrader: (28)

i dont think the s472 will faster then the s465 that i have now? first hit was with the 475 and last two hits were 465 not sure if you noticed that

Gonoma

iTrader: (15)

glad an expert came in lol i was way off

DrTurbo

iTrader: (3)

We are planning to bring the S88 and S91 back and even versions of the S88 and S91 with the new ET-R billet version...