Tricky-Ricky Posted July 25, 2007 Share Posted July 25, 2007 Anyone know what frequency the ECU is set to listen for on a std TT? Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 25, 2007 Author Share Posted July 25, 2007 Anyone? maybe if i got hold of the knock sensor part number, i might be able to find out from the spec of it? Link to comment Share on other sites More sharing options...
Ian C Posted July 25, 2007 Share Posted July 25, 2007 No idea. I'm currently struggling to calibrate my KnockLite and I think I'll have to fit a Bosch sensor for it (I've had one knocking around, pardon the ghastly pun I just accidently made, for years). I'm beginning to suspect that the knock sensors on these engines are a dark art. Either that of trying to calibrate the engine noise levels on the sensor while in 4th gear at 110mph, on boost and left foot braking while driving one handed isn't really panning out? -Ian Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 25, 2007 Author Share Posted July 25, 2007 The reason i ask is because i have rediscovered a a new ish, stand alone knock reader that comes with its own sensor, and is completely user configurable for frequency (6-10khz) and sensitivity, and has peak hold and user selectable alarm and light for warning, but is kind of useless if you don't know what frequency it needs to be set for:( Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 26, 2007 Author Share Posted July 26, 2007 Anyone? Link to comment Share on other sites More sharing options...
Matt Harwood Posted July 26, 2007 Share Posted July 26, 2007 LOL, I've got an RTA, (Real Time Analiser), that would probably be able to take an input from a det can mic. If you can make your car drive cleanly, I can monitor the resonant frequencies of the engine generally. Then, LOL, if you can make it det it's knackers off, we can find the offending frequency! Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 26, 2007 Author Share Posted July 26, 2007 I can do that myself with the EMU and det cans, but I'd rather not;) but i suspect thats the only way to calibrate the dam thing Link to comment Share on other sites More sharing options...
supra matt Posted July 26, 2007 Share Posted July 26, 2007 No idea. I'm currently struggling to calibrate my KnockLite and I think I'll have to fit a Bosch sensor for it (I've had one knocking around, pardon the ghastly pun I just accidently made, for years). I'm beginning to suspect that the knock sensors on these engines are a dark art. Either that of trying to calibrate the engine noise levels on the sensor while in 4th gear at 110mph, on boost and left foot braking while driving one handed isn't really panning out? -Ian Ian are you trying to run this off the factory Toyota knock sensor? as they wont work with them ! I also have a knocklite with the bosh sensor but have not set it up yet , ! Link to comment Share on other sites More sharing options...
SBDJ Posted July 26, 2007 Share Posted July 26, 2007 I remember reading that the primary knock frequency is directly related to cylinder bore size - approx 573/bore (in mm), giving 6.66KHz These show the frequency response of a stock 3S knock sensor. Obviously I know its a different engine altogether, but it's also an 86mm bore. http://www.mrcontrols.com/images/knock-sensor-toy.jpg http://www.mrcontrols.com/images/knock-sensor-toy-2.jpg Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 26, 2007 Author Share Posted July 26, 2007 Thanks for that, but surly the number of cylinders would have some impact as well? Link to comment Share on other sites More sharing options...
SBDJ Posted July 26, 2007 Share Posted July 26, 2007 I'm no expert - far far from it in fact, but I would have thought the only significant impact the number of cylinders would have would be the number of sensors and/or sensitivity required due to the ability of them to actually hear the knock? Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted July 26, 2007 Author Share Posted July 26, 2007 Just done a bit of searching and found your pretty much spot on, but there is also this to consider,(The diameter of the cylinder bore determines the primary knock frequency. Secondary knock frequencies are controlled by the other dimensions of the combustion chamber, high level harmonics, and the downward motion of the piston.) So just how the secondary side of this affects the final frequency generated, i don't know? Link to comment Share on other sites More sharing options...
SBDJ Posted July 26, 2007 Share Posted July 26, 2007 I suspect it's a harmonic made up of multiple knock frequencies, with the primary being the loudest/strongest of them? If not, god only knows how you'd calculate it Link to comment Share on other sites More sharing options...
Wez Posted July 26, 2007 Share Posted July 26, 2007 Dont know if this is was you are looking for. The stock knock sensors output a 0-5v signal with 0v being dead quiet and 4v+ being an issue. Here is a screen grab of the stock knock sensor calibration from the AEM software. Link to comment Share on other sites More sharing options...
Ian C Posted July 26, 2007 Share Posted July 26, 2007 Ian are you trying to run this off the factory Toyota knock sensor? as they wont work with them ! I also have a knocklite with the bosh sensor but have not set it up yet , ! Yes I am and apparently no, they won't Couldn't get the bloody HKS Knock Amp to run off them either. I had a chat with Jermaine from TurboXS and he suggested using a Bosch sensor, as the KnockLite was built around them, so as I've got one minging around I'll bolt it onto the block where the FPD used to be mounted and see what happens then. Means I've gotta string more bloody wiring through the firewall, but as I've just got a funky ECU-controlled WI kit to fit as well, may as well do it in one hit Probably not before sunday though! -Ian Link to comment Share on other sites More sharing options...
Ryan.G Posted July 27, 2007 Share Posted July 27, 2007 Getting the knocklite and other knock systems to work of the standard sensors is a pain because the stock ones have 1 wire going to them and the ground out through engine. But the knocklite and other brands have a 2 wire input for knock and are ment to be used mainly by broadband frequency knock sensors which have 2 pins like the bosch sensors Link to comment Share on other sites More sharing options...
Ian C Posted July 27, 2007 Share Posted July 27, 2007 OK OK I'll use the Bosch lol Link to comment Share on other sites More sharing options...
Ryan.G Posted July 27, 2007 Share Posted July 27, 2007 Just so you guys know the standard knock sensor system on the supra are superb. When i have mapped powerfc's on supra's they always picks up det on the datalogging when ever i hear it through the det cans. And the ability to flash the warning triangle in the middle of the dash lets drivers know if they are ever getting any slight knock if crap fuel or high air temps cause it. Link to comment Share on other sites More sharing options...
Wez Posted July 27, 2007 Share Posted July 27, 2007 Just so you guys know the standard knock sensor system on the supra are superb. When i have mapped powerfc's on supra's they always picks up det on the datalogging when ever i hear it through the det cans. And the ability to flash the warning triangle in the middle of the dash lets drivers know if they are ever getting any slight knock if crap fuel or high air temps cause it. I have the AEM setup to do the same and seems to work really well. Link to comment Share on other sites More sharing options...
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