B.I.G SCOOB

hello again,just a couple of questions about knocklink sensors,what are they and what do they do?also i have a classic uk impreza and she has been looked after really well,how much boost can i run?i have an mbc,hks filter,hks exhaust and le mans dumpvalve.I really hope you can help,many thanks oh and since my last post i found out that the pigs on solbergs mirrors are one of his sponsors a japanese manga mag called young!see i'll bet you all sleep alot easier knowing that!!!lol

Delboy2

A knocklink basically consists of a microphone (Bosch Sensor) and some electronics which resembles a 'bandpass filter' (specifically designed to listen to the frequency range associated to DET)
More information can be found HERE
You probably be able to run about 16psig (1.1bar) as long as don't have any detonation but should have the fuelling checked to make sure everything is safe
What MY is your classic?

Cheers

B.I.G SCOOB

thanks for the info,i think its an my94 on an m reg.ive got the car at 0.9bar at the mo so 1.0 to 1.1 should be safe in theory?are these knocklink devices expensive?

Delboy2

Knocklinks are £150 shown HERE
The standard level of boost is 11.47psig and the fuel cut is 14.87psig on a MY94UK model so to run anything over 14.87psig(1.02bar) you will have to either fit a Fuel Cut Defencer (FCD) to raise the boost cut or source a scoobyecu which are pretty rare nowadays. It should also be noted that the standard map sensor on the early classics 'top out/saturate' at 17.2psig

Cheers

B.I.G SCOOB

once again thanks for the reply its helping me no-end,so my car can run the 1.1 bar of boost with reasonable safety as for the knocklink they sound reasonably priced and better safe than sorry.the reason for my questions is that in a magazine with retro cars in it,it says that the standard impreza could run the 1.2bar without much work,before doing this im checking with people in the know as i love my car and would hate for it to blow up on me!!

LDA

no, your car can't run more than 1.02 bar without a fcd.

L.

B.I.G SCOOB

cheers L much appreciated!