rxsevn89

I need to know how to tell the difference between s4 and s5 turbo and nonturbo rotors like fatory stamps in the rotors. markings anything. I know the tubs are different but a local guy has a 89-91 s5 nonturbo car and when he pulled the motor out it has what I'm pretty sure are turbo rotors and housings. So I does anyone have a way to tell by the letters and # stamps on the rotor? any help would be great.

Sideways7

iTrader: (7)

To my knowledge the only stamps on the rotor is the weight stamp, which won't tell you if its turbo or non-turbo. I don't actually know of a way to tell if its turbo or non-turbo, just s4 or s5.

KompressorLOgic

iTrader: (6)

s4 rotors the compression pocket is rough and cast? ( or something like that) and then on s5 rotors its smooth and machined

then within each series

the s4 turbo rotor has a pretty deep pocket, and the s4 na one isnt as deep

then in s5 turbo has a semi deep pocket, and the na rotors have a shallow pocket

with out a pic u might not know what im talkin about but if u have a couple rotors to look at u can tell which series it is or which is the deeper...

SirCygnus

iTrader: (1)

i just realised weight has nothing to do with it. lol. shizer. lol. hm...

Dom_C

Didn't want to start a new thread so i decided to post here. Are there really no markings on the rotors to tell the difference between turbo and n/a rotors.? thanks for the help
Dom

cpubugs

well correct me if I am wrong but weight does have a little to do with it. at least between the turbo and non-turbo, because if the pocket is deeper on one than the other I would assume more metal is missing on the deeper ones. I thought I read that the s5's were lighter than the s4 which is why when rebuilding people perfer the s5.

Dom_C

same series turbo and n/a rotors are the same weight, i just am not sure how to tell the difference between turbo and n/a