Advice on knock sensor for tuning newb

[edfiero1]

This winter I'm going to be building a Pontiac Super Duty 4 engine. (Block is based on the Iron Duke, but much stronger)
I'm targeting compression to be around 10:1. I'd like to put a knock sensor on this engine (it did not originally have one).

Can someone recommend the sensor and associated module that would work best with this noisy four banger?

I plan to use something like Megasquirt or Dynamic EFI for computer.

Thanks

[Scorp1us]

Why would you ask this in the GM thread?

See whatever knock sensors the MegaSquirt or DEFI recommend.

The GM sensors are basically all the same, though there seems to be a difference between auto and manual transmissions. The auto is more expensive for some reason.

[edfiero1]

Why would I ask the question in the GM thread??? Uh, because its a GM engine, and a GM ECU. Call me crazy, but this seemed like a good place.
From whaI have read, all sensors are NOT the same. There are ~4K ones and ~100K ones , and perhaps others.
Megasquirt isn't going to require a specific sensor, the question is about what sensor is going to work best with this engine, give accurate results/less false knock and be easier to tune.
Hopefully that cleared up the question a bit.

[sturgillbd]

The knock sensors are also tuned for bore size. The size of the bore determines the knock frequencies. Edfiero1, what is the bore size of the engine you are putting together? Yoiu may be able to use a knock sensor from a comparable 4cyl like a grand-am etc. If the engine is noisy, there have been good results in using a 90 degree elbow or a straight fitting to space the sensor out from the block to transfer less noise to the sensor. It would be a trial and error kind of endeavor.
HTH
Brian

[Scorp1us]

Sorry, I thought a megasquirt was a computer, leaving you with just a GM engine block.
Not knowing much about what MS expects, you need to have something that is level-compatible with it, and something that won't register false knock.

Brian, any idea why the GM sensor varies based on manual vs auto?
auto - http://www.autozone.com/external-eng...1574_0_0_1277/
man - http://www.autozone.com/external-eng...sor/45338_0_0/

[brian617]

On the trucks (assuming same for cars) PCMs were used for controlling E type transmissions, and ECMs remained for manual transmissions and non electric autos. The different computers required different knock sensors. The PCMs have an internal knock board on the Memcal, while the older ECMs had external knock filter.