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The mkiv Supra Owners Club

det sensor device?


chilli

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is it possible to fit a det sensor to give immediate warning of det on the dash?

 

bit like det cans but just sensing all the time and warning you if there are any signs of it?

 

never heard of one but just wondered why. If they don't exist I wonder why not, hard to sense?

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I think it's got a scaled output, so it warns you of the odd sping all the way up to nuclear explosion. It's also apparently got an audible alarm, which is great because you can take that and plumb in a fuel cut mechanism to it :thumbs:

 

My wallet has gone lean lol

 

-Ian

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I can't say how much it is as it's a special deal for what it is but you aren't going to get much change out of £600 :blink:

 

Trouble is it does AFR monitoring too which I just don't need as I've already got it, so I'm kinda paying for a big function that I won't use, hey ho.

 

Yes, it's cheaper than a new engine I guess, if it works :cool: I always wondered why more people don't have them, so maybe I'll find out they don't work or something.

 

-Ian

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be interested to know how you find it then. be great if it does work properly.

 

I guess they are not available just as det detectors then? Shame if that puts the price up, I too already have W02 sensing.

 

I wonder how it works, guess in simplistic terms it is a microphone / filtering and maybe some DSP to recognise the signature of det, or maybe even all the signal conditioning is done in analog since it can't be that involved can it

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So it has dual functionality. In that case it sounds alot better. Can it triger an alarm/ additional fuel if AFR's reach a predetermined level too.

I may be wrong but I thought AFRs going critical always were ahead of det.

 

you might well be right, but are lean AFRs the only way to get det for sure? what about high inlet temps (duff IC) etc or do they all manifest as lean AFRs first?

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  • 2 weeks later...

Ricky, It uses the stock sensors, it also monitors the crank and cam signals. Ian's arrived today, so he'll have news over the weekend.

 

Mike, Lean is different dependent on what you're doing at the time. But if we look at Wide Open Throttle, this should see a safe 11.3-11.7:1 (rich)...10's would be richer and safer still but you'd lose power and economy. 13:1 would be dangerously lean on boost...not enough fuel. It's x parts air : x part fuel. 13 parts of air to 1 part of fuel = less fuel to air.

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Bit of bumph , Copied and pasted.

 

The HKS A/F Knock Amp is an electronic monitoring device that displays two of the most vital engine conditions for tuning; engine knock and air/fuel ratio. Engine knock occurs when there is abnormal combustion knock as detonation; which can rob power, reduce engine longevity and even lead to catastrophic failure. The A/F Knock Amp utilizes the factory knock sensor, allowing you to monitor in real time engine knock visually and audibly via earphones (not included). By adding the optional HKS wide-band O2 sensor, air/fuel ratio can be monitored visually on the back-lit LCD display. A warning function can be set for both engine knock and air/fuel ratio where an audible alert sounds if the preset warning is reached.

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If anyone else wants to try the HKS Knock Amp I'll do a special price of £430 including postage.

 

http://www.hksusa.com/products/?id=1694

 

[qimg]http://www.hksusa.com/images_products/L_1751.jpg[/qimg]

 

You evil man:rolleyes: maybe you should change your name to "old Nick" as in "get thee behind me" :D going to have to apply for another credit card soon:innocent:

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I'll warn you now, the instructions are in Japanese :) I managed to wire it up in a feat of intuition, guesswork, experience, and hieroglyphics-matching that would have shamed Daniel Jackson, but there are 18 menus and they just show a number, so I really need the English instructions to get any further! If anyone has them or can translate, let me know :) Once I've got it all together I'll knock up a fitting and usage guide and a review and stuff :thumbs:

 

I realised why it uses crank and cam angle sensors - it actually uses them to know when a cylinder should be going off or not and also to know how fast the engine is going, so it can factor those into the noises it's hearing. So it's quite a sophisticated bit of kit by the initial look of it.

 

-Ian

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Once I've got it all together I'll knock up a fitting and usage guide and a review and stuff :thumbs:

 

I'll look forward to reading it tonight when I get in then, get to it! :D

 

I realised why it uses crank and cam angle sensors - it actually uses them to know when a cylinder should be going off or not and also to know how fast the engine is going, so it can factor those into the noises it's hearing. So it's quite a sophisticated bit of kit by the initial look of it.

 

Oooh so it's a bit cleverer than just listening for noises then :thumbs:

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