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Low cost wideband controller(JAW) *SHIPPED (11/01)*


Komeuppance
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  • 1 month later...
alright, I marked off 2 places where my wideband will fit well on my *DM downpipe, one is about 25" down from turbo and the other is about 34" down, any input to as which one is better, im leaning towards the 34"... From what Ive heard they are to be 24 to 36" down the pipe. Anyone hear different? What is the shield that other member referred to in this thread?
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  • 3 weeks later...
got my jaw installed and working, looking for an rpm source for data logging, ive read that the white wire #1 on ecu could be a source, but havent been able to determine what type of signal this is, or what the jaw needs. The 2 other inputs are 5 volts, im not sure if thats the same for rpm on it, or if the white wire is a 5 or 12 volt square wave? Can Anyone shed some light ?
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  • 2 weeks later...

Had a member ask for some pics of my install, so here are some pics: http://www.teisprint.com/~dom/tsi/tsi_mods.html

dont be to harsh, not the cleanest work, but im in a rush to get everything done and the car ready for autocrossing in 3 weeks... I didnt get a shot of it, but I ran the wideband O2 wire right thru the floor directly above the sensor, made grommet for the wire then sealed up the floor, very permanent, but worked out well as i didnt have to extend the VW harness, bc it reached... right now im messing around with the serial port, i can query the jaw and get its firmware info etc, but I cant get it to data log... not much info in the help docs :-/

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Looking good man!!

 

Won't datalog?? Are you using a USB to Serial adapter?? Those usually seem to cause problems if they're not a reccomended type.

 

Can you describe exactly what troubles you're having... you click the start datalog button and then after a while, you click stop datalog?? Hmmmmm... let me look into it. I'll contact the designer, he's usually pretty good about fixing problems. I posted a link on here to the JAW forum... but it seems in the change over it's got axed.

 

http://www.14point7.com/forum/viewforum.php?f=2 there's a ton of spambots on there, the owner is sorting it out.

 

Did you get the RPM logging sorted out?? What solution worked??

 

Where did you get that lift!? I must get one...

 

-Robert

Edited by Komeuppance
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I'm using serial to usb adapter by keypsan, i heard they were good and have used it before without issues on network hardware. Weird thing is I can change values in the jaw, I accidently changed the calibration and the display went out of wack, but then i figured out what I did, set it back, and it was back to normal, so im still not sure whats up, havent gotten anymore time with it. Still working on rpm, i guess my voltage reg idea wont hold up so i need a divider, but since logging isnt working anyway im putting priority on a TB rebuild, one of my gaskets is leaking... Let me tell you one thing about that surprised me with the jaw, that black voltage reg? w/ the black heat sink on it gets hot! way more then i expected..., the top of the shelf is cut out in my install to let the heat out. Heres were I got the lift: http://www.completehydraulic.com/ I found them on ebay, its a pretty good scissor lift, needed the wood tho to lift low cars to keep exh and stuff from hitting etc. Edited by Car6on14
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Use a zener regulator circuit. I believe the response time of just using a 3 terminal regulator may be a factor. A voltage divider is not th best either because that is just cutting a percentage of the input square wave. If the wave spikes so will the output to your JAW. A zener circuit will keep a constant voltage to the output no matter what. I can help out with the zener setup if you need it. Edited by psu_Crash
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i think one users posted that the coil voltage will spike much higher then the 35v max that the regulator can handle (like in the thousands?) and fry it. Im not sure if this is true, I do have 2 spare 87 ECU's that I was planning to test the reg on one of, but I need to get the jaw to datalog first.
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Use a zener regulator circuit. I believe the response time of just using a 3 terminal regulator may be a factor. A voltage divider is not th best either because that is just cutting a percentage of the input square wave. If the wave spikes so will the output to your JAW. A zener circuit will keep a constant voltage to the output no matter what. I can help out with the zener setup if you need it.

 

That'd be great. Can you post info on what worked out the best??

 

-Robert

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Well I went for a few runs today, mine doesnt seem to easy to tune, its weird seems like my tune changes even when im not changing anything... My idle a/f was around 11 then a fan turned on and it went up to 12 ish. WOT seems ok, but mid is really bouncing around from 11 to 14, not sure if it bad tune or sensor etc. I found I have another issue tho, looks like im pushing 15psi on the stock waste gate, its seems to hold 7 psi up to mid 4k then im not sure if its bc of my porting & 3 " *DM but i spike to about 15 psi until redline.
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Hey Robert! Here is the schematic for a zener regulator to take the 12 volt square wave off the wire on our ecu and convert it to a 5 volt wave for use with the JAW or anything else that requires a 5 volt peak square wave for an RPM input. I tested this circuit last night for 4 hours straight with a solid 15 volt input and the output didn't flinch from 5 volts. The zener diode is 5.1 volts rated at 500mW (1N5231) a 400mW would work too. The resistor I used was a 1/4 watt but you may want to use a half watt although it is not necessary. Just to match the current handling of the zener. I recommend using a 270 ohm resistor (not 270k) though since that is the value i used for calculations. There is a slight amount of variaion available with the resistor but a 270 is a common size so use that :) The ground used should be the same ground that the ECU and JAW use which i believe is just a frame ground. Any questions feel free to ask!

 

 

http://img201.imageshack.us/img201/8796/zenerregulatorbt3.jpg

Edited by psu_Crash
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  • 2 weeks later...
  • 3 weeks later...
So i got my wideband all in and hooked up finally. Seems to work ok but the display is constantly flashing on me. I currently have it connected straight to the battery with a toggle switch to turn it on. Going to setup a relay to operate it soon. Anyone else have a flashing display problem? Tried changing the refresh rate too but didn't make much difference. One more thing ... I set Vout 2 to narrowband output and have it connected directly to the old single wire O2 connection. That should be fine right? Not sure if the voltage it outputs is the same as the stock O2.
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Just installed a JAW in 83stariontravis' car... works great.

 

Before it would datalog, I did have to press "start datalog" twice, it gave an error at first(I didn't read it, just clicked ok)... second click it worked right away. Are you using vista or xp??

 

And setting your vouts, you'll need to make sure you hit download vout button. I didn't notice it at first and was wondering why it wouldn't save. NB should emulate a narrowband sensor, so your connections should be fine.

 

Flashing display, did you try changing the refresh rate to the lowest setting, write, turn off the JAW and turn it back on?? Is it a solid blink?? Or flicker??

 

-Robert

Edited by Komeuppance
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Yeah I did all that. It is a constant blinking but not on a regular pattern. Going to check out the wires and make sure I have a good connection everywhere. I am sure it's nothing major I would just like to know what A/F I am running ... :) I think it is still reading correctly even though it is blinking. Gives me high 14's at idle so it sounds about right. By changing the V out values we could in effect control our A/F couldn't we? .. hmm .. Better not mess with it and just use it till the Megasquirt goes in.
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Could be the display cable... I did modify it. Make sure the twisted end connector is tight by unplugging it and pressing the top and bottom together with your fingers.

 

Could change the a/f slightly, but it'd be across all rpm ranges. Ha...

 

-Robert

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