Knock Sensors
 

Hey,
I'm running NA rotors on a turbo motor and need something to help control knock on my engine. I've been reading up on J&S's UltraSafeGuard and it seems like a good investment, but I'm running a TEC3 which already has knock protection so it wouldn't be much of an improvement. I was wondering what everyone elses experience tackling knock has been? Are the gauges very accurate and how bad is the stock sensor?

bump

Is that a 3-channel unit?
The single channel unit is "useless".


-Ted

I really don't know, but I can check later. I don;t know much on about knock sensors, can you give me a quick run down on the differences?

I'm interested as well...I always wondered why these weren't used more on rotaries. Then again, I know next to nothing about knock sensors. I guess if they were a useful tool more people would run them?

most knock sensors are single channel.. that means that when they go off(register knock). Only your leading plugs get retarded.. the trailings stay the same... and that is the easiest way to blow an engine... retarding the leading past the trailing??? need to be able to retard all 3 channels.. evenly... another solution to the high comp./boost issue. > alky/water injection above 10psi.....
Both are on my list to get...

Hey Reted feel free to comment, I'm sure you have a better answer/solution...

I'm trying to avoid alky/water injector if possible. Besides, from what I understand the difference between the single channel and the 3 channel is how the engine controller interprets the signal from the knock sensor.

That's exactly it.
I learned this from experience, unfortunately. :(

I saw an FD grenade itself cause the J&S was pegged full...dyno operator was an idiot and told the owner to IGNORE the J&S.

The trailings will happily push the ignition timing into detonation.
The motor will kill itself.
You need three channels to evenly retard all the spark.

I've seen the J&S single-channel work wonders on Hondas.
Hondas run single channel into a distributor.
One box allows it to retard all 4 cylinders.
Advance ignition...engine pings...J&S retards...motor stops pinging...advance is slowly returned.
You can do this at WOT and not have one worry - the J&S works when executed properly.


-Ted

i'm kind of a newbie when it comes to ignition, but a little help would be appreciated :)
I just looked on the j&s website and they now have up to a 4 channel ultrasafeguard, but, say i'm running 6 msd coils and an AEM c2di on a 20b, how would i go about controlling knock/retarding the timing? multiple boxes? this is one area i really need to research and learn more about. thanks!

This might seem kindof like a dumb question, but why 3 channels? Wouldn't it be 2 channels for both leading and both trailing or each rotor? Or 4 channels for every spark individually? Also, who makes a 3 channel system? Should I just piggy back multiple systems?

J&S makes a 3 channel system (actually i think its just the 4 channel). 3 channels for three stock coils (fd), one for each leading, and one for both trailing.
http://www.jandssafeguard.com/safeguard.html

One for each leading and one for trailing. As stated above, I believe J&S makes a system for up to 4 channels now.

Are there any other products other than the safeguard system? There's got to be something to compare it against...

Actually, that'd be the other way around. One channel for the leading coil, and 2 channels, one for each rotor, for the trailing coil.
Wastespark fires on the leading.