on an s4 t2
if there is no knock sensor at all hooked up will the timing automaticly stay retarded as a fail-safe feature??

 

no, it will stay at default ECU timing.

 

did S4 come with knock sensors? Don't have one on mine. huh.

 

I thought it was only s5's that had stock knock sensors.

 

S4's do have a knock sensor. Hailers called me out one time when I said they didn't... it's mentioned somewhere in the FSM.

 

Its the 1" black sensor located on the drivers side intermediate housing.. right below the oil filler neck. Its elec. connector is on the same little harness as the TPS and intake air temp sensor. At least... thats where it is on my j-spec.

 

The knock sensor won't save your motor...I dont usually worry about them too much. If the engine I'm working on has a good one, I put it back on. If it has a bad one, I put it back on. If it doesnt have one at all, I dont put one on.

RETed claims that the sensor gets ignored after about 4krpm, which is believable...and also which is when this engine would encounter the bulk of it's knock anyway. The rotary is such a violent combustion engine under full throttle that most knock detection systems cannot distinguish normal combustion from knock. Notice no one ever talks about running J&S knock boxes on their high power rotaries? Notice no tuners ever speak about knock detection, but instead tune for the possibility of knock? That's why.

 

haha well i dont run one anyway ( cuase im using a NA harness) ... was just curious if my timing was being pulled back because of not having it.

 

Well not exactly true. Lots of guys in the single turbo section running alky or water injection use a knock box including myself (msd) Jrat uses the same one and has had very good results using it.