madaz07

is there any difference between th s4 and s5 turbo on the cold side????

Derek10AE

My understanding is that the exhaust turbines are the same. The housings are different and the S5 has a dual wastegate setup compared to the single on the S4. As for the exhuast housings the S4 uses the twin scroll system with two different sized exhaust runners.(using only the smaller of the two at lower rpms). The S5 uses two seperate runners of the same size.

madaz07

i know they are a different ar ratio. but i want ot know if the inlet compressor and housing is different??

Derek10AE

opps posted info about the hot side instead of the cold side. I believe the compressor wheel and housing are exactly the same but don't quote me on that.

madaz07

thanks anyway there were a few bits there a didnt know

2a+RoN

from my experience, cold sides are identicle... hot sides are only thing that changed b/w series.

madaz07

ive been told the s5 turbo spools quicker i know it has better boost control

Scott 89t2

looking at your sig throw both out. you need a big one

madaz07

yeah i know im thinking of getting a to4b wheel put in just for now and getting the w/g ported get rid of that boost creep.

TurboII RudeBoy

looking at ur sig ur pushing atleast 250-260 at the wheels if its tuned right.

madaz07

im getting it tuned soon not on dyno yet cuz the guy i go to hasn't got it going yet. but its getting tuned with a autronic wideband its got a few hicups but when i stand on it in first its spins my 225/50/16's

2a+RoN

I'm gonna have a hybrid up for sale soon. Its a s4 with upgraded compressor done by turbonetics ~15k miles ago. PM me if interested.

P.S. I ported the wastegate and runners and knife-edged the compressor housing.

KNONFS

iTrader: (14)

Hmm...

The Jspec I received, have a double blade(?) setup on the cold side, where the old S4 turbo only had a sigle blade on the cold side.

Does that means that I have a upgraded cold side?

Fingers

... or a downgraded one

check the sizes by using a caliper.

Good luck.