Exhaust looks tasty
Well I played about with my daily today. It's an mx5 mk2.5 with the 1.8vvt engine.
The timing on these isn't adjustable like the mk1 mx5s(or our bseries) well not adjustable to most people lol
Here's what I did,
This engine uses a crankshaft position sensor, the ignition system uses this sensor to know when to fire the sparkplugs. It's not adjustable in anyway and just bolts down by the crank. So I took it off and got the drill out.
Notching the sensor like this allows me to change the time at which the sensor measures the crank. So effectively tricking the ecu into thinking the engine is afew degrees later into its stroke and thus delivering the spark afew degrees earlier.
I backed this theory up with the knock monitor before and then after I saw this
Pretty sure I could hear it at high rpm and the monitor seemed to back me up every time. It's on 95ron(naughty naughty) ATM but i'll put a tank of 98 in and then see if the noise i think is DET goes away.
All fun and games and some more lessons learnt today.
I need to find a way to trick the knock sensor on the engine, I think it's pulling timing from it when it senses the knock, I want to hear some severe knock to confirm what I'm hearing as light knock.
Yeah man hpa has helped heaps.
The only issue I can see with your method is no filtering of the noise, if I run the plex in "no filter" mode it's so noisey I struggle to hear the knock and just hurt my ears lol
Apply say a 6khz filter to the signal and it's MUCH easier to hear.
I bought this because I'm hoping to tune other cars eventually, so it's more of an investment to me than a toy.
Atleast that's how I justify the cost of it!
Yeah man....It has vbands!
I've always had bodged/scrappy exhaust systems so this is the first time I've had something decently made on any car I've owned.
Strangely more looking forward to seeing the new turbo/manifold and the exhaust over the roll cage lol
You see the signal from the picoscope rather than an audible note and you can add a filter and triggers to filter out all the noise, obviously not the greatest thing because you can't hear it and need to keep eyes on it but better than nothing I guess. Maybe one day I'll make the investment!
Cheers guys. Me and a buddy do want to get to Cadwell sometime this year Liam so I'll let you know.
Hopefully I can get a tune on this new build pretty quick, then I can commit to some tracktime at japfest.
Basically yeah, you can adjust the voltage levels and such so that even small knock event would come up as big on the screen. Keep us updated on the tunning, really interested to see what happensAh ok. So you'd see a spike in the signal when knock is detected? Seems like it would work fine for large knock events, not sure how well it would pick up light knock though
Basically yeah, you can adjust the voltage levels and such so that even small knock event would come up as big on the screen. Keep us updated on the tunning, really interested to see what happens