TweakGames

iTrader: (3)

Hello, searched but its hard to search a/r and such. I was just wondering (day dreaming about stuff) what the stock turbo's (s4) A/R is?

Thanks
~Tweak

87turborotary

just read your post and realized no one replied, i dont know what it is but someone should, i would like to know myself considering i have an s4 and never really thought about it until i looked at your thread. sorry man

Turblown

iTrader: (12)

I always thought it was something like 1.0. I'm pretty sure its stamped inside, for some reason I thought s4/s5 were different too. Keep in mind that all depends on the size of the turbine wheel. A 1.0 P trim is HUGE compared to a 1.0 stock turbine..

87turborotary

inside the housing ?

TweakGames

iTrader: (3)

Ohhh kk. Nevermind than. I forgot that the different trims and such matter.
Thanks.

The Griffin

If it's the hotside a/r's you are inquiring about, the S4 is a 0.86 a/r and the S5 is 1.00 a/r (or close there abouts for the two).

arghx

iTrader: (3)

it is my understanding that the s4 and s5 turbos are the same hotside except for the design of the twin scroll system (equal runner on s5 manifold/turbine vs unequal runner with flapper on s4). I've never physically compared them however.

Turblown

iTrader: (12)

The s4 has a smaller scroll on one side therefore it has a smaller a/r.