Running a supercharged S2000 in various competitions here, I'm partly responsible for the car's datalogs / telemetry. I've gotten used to looking for certain parameters - knock amongst the important ones - to judge how the car's running. With my own FC's MS3Pro EVO install ahead of me, I'm thinking of running a knock sensor along with my EGT's and wideband to be safe. I'm just not sure how..

- A knock-sensor is calibrated to a certain engine's harmonics; how / where do I get the right one for my application?

- Where's the best spot to mount it?

- Which conditions could introduce detonation/knock on a N/A half bridge 13B?

edit: My FC didn't come with a knock sensor, that's why I'm looking for options

Hope anyone chips in

 

if you have S5 or newer rotor housings, the knock sensor will screw right in.

you could use a stock FC/FD sensor, or an Rx8 one

a non turbo rotary is most prone to knock in the 1500-2500 area, if you have a lot of timing, and lean mixture.

if you uncork the engine, its probably capable of knocking everywhere, although you'd have to be pretty far off on the tune

 

The rotorhousings are S4 so no bueno there :/

Why do N/A rotaries start knocking at those RPM's then? Our S2000 might see some minor knock volts at peak RPM (9000+)

 

at the low rpm? its probably some combination of too much timing and too lean of a mixture, its not worth digging into, its very easy to tune around it.

at high rpm, its kind of the same as your S2000, if you're too lean, with too much advance, when things get hot it'll knock. its more of a problem with the tuner than the engine

 

The only time I've gotten a nonturbo to knock was when I had the trailing wires crossed.

The high mixture motion means you have to REALLY screw up the tune. The engine will lose power from being over advanced long before it will detonate. I mean like 60-80BTDC, when it starts losing power after 24...