Looking for a Knock sensor

[tvmendoza]

I am looking for an external knock sensor to connect it to my bikirom, therefore it would be preferable if it works from 0 to 5 volts.Thanks Tona

[480sx]

I got a stock one if you want that..

[tvmendoza]

if someone could confirm that it is 0 to 5 volts ill take it.

[kedbmx]

the stock one is 0 to 5 volts but i would recommend a bmw knock sensor. the stock nissan knock sensor picks up too much engine noise. the bmw one only detects knock. there like 25 bucks from the dealer. if you want the part number i can get it for you tomorrow at work.

[tvmendoza]

that would be great, are they 0 to 5 volt ?

[kedbmx]

they are 0 to 5 volts. the part number is 12147839167. it costs around 20 bucks.

[NotDave]

bmw sensor? can you elaborate? any modification required?i sent you an email too.

this is an awesome find cause nissan knock sensors are ~60 on ebay and don't work too well.

[kedbmx]

no mods needed. just unbolt your stock sensor. unplug the clip that is directly attached to the sensor. plug in bmw one and bolt it to the block. they are the same size and use the same clip. but the bmw ones are ten times better. they pick up no engine noise only knock.

[NotDave]

thanks for the quick reply

im gonna pick one up here from the dealer

[kedbmx]

no problem let me know how you like it.

[ZiG]

Is it still a bosch unit? I don't understand how what you are saying is even possible..

[kedbmx]

Is it still a bosch unit? I don't understand how what you are saying is even possible..

its not a bosch unit. it is Siemens. and the sensors physical properties are identical. it just works better than the nissan one. its not to complicated. let me know if you want some pics or a further explanation

[2s4k0y09]

Sweet, good to know. And a part from BMW that's $20... even more amazing..lol j/k

[WDRacing]

For the record, knock and noise are all harmonics. The knock sensor pics up noise or harmonics, that's how they work. It simply depends on the frequency of the knock or noise. So ANY and ALL knock sensors will pick up motor noise, it just depends on the frequency it takes for the sensor to generate a voltage signal.

That's why things like the MSD Knock Meter have an adjustable sensitivity knob to control how much freq the sensor will pickup.

[kedbmx]

Sweet, good to know. And a part from BMW that's $20... even more amazing..lol j/k

it is amazing. bmw parts are expensive. i work at a bmw performance shop and some of the prices are rediculous.

For the record, knock and noise are all harmonics. The knock sensor pics up noise or harmonics, that's how they work. It simply depends on the frequency of the knock or noise. So ANY and ALL knock sensors will pick up motor noise, it just depends on the frequency it takes for the sensor to generate a voltage signal.

That's why things like the MSD Knock Meter have an adjustable sensitivity knob to control how much freq the sensor will pickup.

very true but knock (detonation) has a certian freq. a piezoelectric sensor (knocksensor) can be tuned to pick up only a certian freq. like knock. so a good piezoelectric sensor that is tuned to the correct freq will work the best. not ALL sensors pick up engine noise.
Modified by kedbmx at 7:32 AM 8/28/2007

[philipn126]

so just call up BMW and give them the part #? is there a model BMW that this is off of?

[WDRacing]

Just go to the dealership or autozone etc. Anyone that carries BMW parts will have the knock sensor. Part numbers are also brand and model specific, so you don't need to worry about that. Most likely BMW uses the same knock sensor on almost all of there vehicles anyway.

WD

[philipn126]

thanks for the help. ill try that.

[philipn126]

ran up to advanced auto parts to inquire about this knock sensor. they all thought i was a re-re. the closest thing they could find was $80. im calling the dealer tomorrow with the part #.

[kedbmx]

lol. just get if from the dealer. its definatly not 80 bucks. i dont know what they were trying to sell you. i get them for 12 bucks from the dealer.

[philipn126]

$33.45 from the dealer. just called, i must not have the cool guy discount. kedbmx, check yo email.

[chicos240]

Any chance this can work for the SR20det?

[philipn126]

i dont see why not, nissan used the same knock sensor for a long time. i know its the same on a fwd sr.

[chicos240]

I would try it If I had the want to try to get at that little mofo, its just too far away

[kedbmx]

Any chance this can work for the SR20det?

i am not 100% but im pretty sure it will work.

I would try it If I had the want to try to get at that little mofo, its just too far away

ya it is a pain to get to with the stock intake mani. but its not imposible with a long extender and a long magnet and a little imagination, you can do it. it took me about 15 min. on the dyno with limited tools.

$33.45 from the dealer. just called, i must not have the cool guy discount. kedbmx, check yo email.

i have an account with them thats why i get the cool guy price. http://www.activeautowerke.com thats the website if you guys want to check it out. phil check your email.