Knocksense
 

Anyone using this product?
http://www.viatrack.ca/

talk to medysin he was gonna try that i dont see him around to much now though.

one of our british friends is using it. i probably should do it, just don't feel like spending $100 right now.

My friend has it on his car right now. It's a very professional piece, main issue is getting it "tuned' correctly. Tuning the knock threshold is a little difficult, we just need to buy some serious race gas, tune it so it never goes off with that, and then once we put in pump gas, if we see it light up, then we know we have knock.

Interesting.
I'm trying to figure out all the mods/options that i'm ever going to want to use MS for and i know I want a knock sensor. I hate taking the MS out of my car and figure i should finish all my mods in one whack. That includes: Boost Control, Launch Control, EGT, Knock, GM IAT and heck i might even decide on one more thing but we'll see.

You could always build the circuit on the MSnS-extra site:
http://megasquirt.sourceforge.net/extra/knock.html

Reverant is running it with success. I've got all the parts to build it but I'm not motivated at the moment.

That kind of seems like an assbackwards way of doing it. The easier way would be to determine what is NOT knock. The way you plan to go about it sounds like a recipe for a cooked engine.

Run the car to redline with out going into boost, any events you record SHOULDN'T be knock but regular drivetrain noise. Set the thershold of your device accordingly.

Your Miata has a knock sensor from the factory, use that instead. :)

Jim

Didn't think it would work with MS. I'll look into it.
Or i could ask you. What do i need to do to use it? Build that circuit?

bless he strong Pound ;) cost me not a lot, In fact it'd cost about the same to buy all the components to build the MS curcuit..... as a bonus the Knocksense unit has better filtering built in.

I like it, though tuning it has been a bit of a ball ache, it's still not 100% :(

Yes. :)

Jim

Where is the knock sensor located on a 2000 motor?

-Mike

Thanks.
Could I also use just the knocksense circuit and then hook it up to my stock sensor? Seeing how the knocksense is premade, in a nice box and as said before, better filtered. I think it would just be easier/cleaner for me to go that route.

Right next to the oil pressure sending unit on the right side of the block.

I don't think you would have any problem doing that.

Jim

I'll contact them and see what they say. That would be awesome if that setup worked.
Are you just datalogging knock or do you have it acting when it hears knock as in pulling more timing?

I'm retarding automatically as well, 2* on the first knock, 1* for each subsequent knock, 5* max. I'm running N/A 10:1 and if I fail to get 100 octane gas, it pings at certain RPM zones, mostly between 2000-4000.

Jim

Really? at that AFR and whilst n/a? are you sure it's not just engine noise that the knock sensor is picking up?

Is that 100 octane north American or European standard? There is a difference I believe.

I run 91 octane on my stock 2004 and I think I have noticed some ping under certain conditions as well, kind of makes me worried about going with MS and a DIY turbo setup. This knock sensor is a must.

What timing curve you using Jim?

I know the NB are more knock prone due to the higher compression ratio, but still you must be running extremely aggressive advance mate.

As a indication, last summer i was running at 6psi without IC or WI, at 14btdc and using the stock timing curve.
And i was using normal petrol.

It's also very strange that your getting knock at THAT low a revs.

I've seen and played with various FI's and N/A 5's and i've never seen one knock below 4000rpm.
Nearly every single one starts knocking around peak torque (4200rpm).

If it was me i'd retard the timing a bit and see if it still knocks, as Richy say's it might just be engine noise.



Cheers
Mark