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Post by Rocketdog on May 23, 2011 11:08:44 GMT -5
Nice work on the EFI system. Looks great. Now you've gone and gotten me interested in one.
JMK you gonna run one of these setups on Stella?
RD
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Post by theswede on May 23, 2011 12:50:34 GMT -5
Thanks RD. Unfortunately it seems my O2 sensor mount was faulty, I seem to have manage to kill the sensor. Not really sure how, but condensation is a suspect. I think it died after a long run in RICH mode... I will have to wait for a new sensor from Ecotrons before I can continue my tests. It seems it is very important to follow the instructions where they say the O2 sensor should be between 3 and 5 inches from the exhaust port. Stupid me thought I could get a way with a different location, as I have the emissions junk left on the valve cover which prevents me from installing the sensor close to the exhaust port... Now I need to get the valve cover off, and use an angle grinder to remove the emissions crap that is in the way. Or get a new valve cover... And get the bung re-welded on the exhaust of course. The scooter runs even without a working O2 sensor, pretty impressive actually. It uses the other sensors to calculate the proper FI timing, and does a fairly good job. But I have lost power, the scooter essentially runs as if it was a 49cc with all the restrictors removed...
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Post by Rebel on May 23, 2011 17:08:49 GMT -5
RD, JMK is injecting his LC Zuma.
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jmkjr72
contributing staff
Commander 132nd Northern Cav. Division
Posts: 2,779
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Post by jmkjr72 on May 23, 2011 21:19:38 GMT -5
Nice work on the EFI system. Looks great. Now you've gone and gotten me interested in one. JMK you gonna run one of these setups on Stella? RD like rebel said its going in the zuma lots of work to convert a stella to run fi as they use the old si carbs the first thing would be to convert it to the other style intake and i would loose the oil injection and premixing isnt good for the injectors
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Post by Rocketdog on May 25, 2011 5:57:32 GMT -5
Perhaps a larger diameter exhaust pipe would help that Swede?
I missed that part JMK. Would be a pain. You'd have to get a CV setup. The oil in the fuel would hurt the injector or just throw off the computer?
RD
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jmkjr72
contributing staff
Commander 132nd Northern Cav. Division
Posts: 2,779
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Post by jmkjr72 on May 25, 2011 19:00:07 GMT -5
matt said it wasnt good for the injectors it can be done but not the best way to do it
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Post by Rocketdog on May 25, 2011 19:47:52 GMT -5
Ahhhhh. A shame. I would do it to mine in a minute. Just thinking of a Kitted, Injected, Stella gives me goose bumps.
RD
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Post by theswede on Jun 7, 2011 14:13:25 GMT -5
RD, the pipe is actually quite a bit larger than the original, so I am OK in that aspect I believe.
I got the new O2 sensor today and am hoping to get it installed later this week. I do have an important find to share; USB to Serial converters are very sensitive to RF interference. That is, if you use a USB converter you may get interference from the ignition system that can cause issues. I had incredible problems logging data at first, using a USB converter I had (did not buy one with the kit). ProCAL (the software that comes with the kit) would crash, freeze or simply just behave very odd when running the engine. And don't even think of using a USB extension cable, that makes the issues multiply tenfold... Eventually I borrowed a laptop with a proper serial port and used that, and all my communication issues where gone. Matt at Ecotrons confirmed RF interference may be an issue when using USB adapters. I suppose this may vary between adapters, the one Ecotrons sell probably works best.
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noday
Non-Com
"Sparky" Electronics Research and Development Officer
Posts: 90
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Post by noday on Jun 7, 2011 17:04:06 GMT -5
you can always try a toroid choke on the wire.
it is just a ferrite doughnut that you loop the connecting wire thru several times. they are quite cheap, a $ or 2 at electronic stores or hobby shops.
pretty easy to try.
they are often used to block/suppress unwanted Rf
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Post by theswede on Jun 8, 2011 15:36:15 GMT -5
Good point noday! I actually have a few toroid chokes lying around but I did not think of it... For now I am good using the serial port though. I did get the new O2 sensor installed today, and also wired in the CDI that came with the EFI kit to allow the ECU to control the ignition timing. All works well, and the hesitation I sometimes experienced at takeoff (going from idle to WOT) is gone. Need to log some data to make sure the O2 sensor is working properly, then I can start tuning for real
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Post by theswede on Jun 12, 2011 16:27:18 GMT -5
Update: It seems I have manged to damage my cylinder and piston, due to the fact that the engine isn't getting enough fuel at WOT and subsequently has been running lean and overheating. Apparently the injector I got with the kit is too small for my heavily modified 72cc engine. I just heard back from Matt today and he says that after analyzing my logs it is apparent I need a larger injector. He kindly offered it for free as long as I pay for the shipping. Great guy! Anyway, I now have the same clattering noise in the engine as I had last fall, when the engine overheated due to a too constricted exhaust. I think I can get away with replacing the piston only this time, need to tear down the engine to check. But I must confess I am a bit tired of issues with my scooter lately...
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Post by Rebel on Jun 13, 2011 0:14:46 GMT -5
Oh what a pain, sorry to hear that. It seems sometimes that it might be better to just leave the scooters alone doesn't it.
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Post by theswede on Jun 13, 2011 7:25:58 GMT -5
Agree Rebel, but then again I can't stop tinkering....
I just ordered a new cylinder kit from Autotech355, hope to have it here in a week or so. And the new injector should be here around that time too. I am considering to install an oil cooler, that may help preventing similar disasters in the future...
I do have a temperature-gauge dipstick, and the oil temperature is pretty constant around 90C when running. Except for that one time when I saw it hit 120C after an extended WOT run... That's probably when the piston got damaged.
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jmkjr72
contributing staff
Commander 132nd Northern Cav. Division
Posts: 2,779
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Post by jmkjr72 on Jun 13, 2011 17:27:56 GMT -5
i would also add a cht to your set up that way you can see the head temp right there on your head set
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Post by theswede on Jun 14, 2011 6:16:22 GMT -5
Yep, some way of actually monitoring the head temperature when running would be good I suppose. Kind of hard to see the the dipstick when riding...
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