I think some of the boxes have a balanced input that floats free from ground. Some have a one terminal pickup that one side of the coil is grounded to the mounting screws. It's a very electrical noisey enviourment .
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TCI Replacement 2020 It Works
- Thread starter Team Junk
- Start date
legendary yamaha
IG:ne_caferacer_club
I apologize for my ignorance but the 1977 xs650 TCI engine?? or will need the modification and add the magnetic??
Also can you post a list of all the materials needed , and some pictures while during the work.
Thank you
Any chance this "Gonzo" box could be modified to hook up to a computer and flash your own custom timing advance curves? It amazes me you guys are this deep into this project. Great work!
legendary yamaha
IG:ne_caferacer_club
Oh well...
We're still in the R&D phase right now. When it's all worked out, we'll publish detailed instructions on how to mod your bike. Right now we have no plans (or desire) to produce kits. This will all be DIY for anyone who wants to do it.
First I need to confirm the google id of this chip
Haven't had a chance closely examine the datasheets to see. There are large number of chips in this family and it also depends on who made the board and if they brought out the pins needed to flash the chip. These chips use flash so it should be doable. I have seen products made from these kind of chips where the manufacturer flashes the chip and then zaps a fuse in the chip to prevent it from being reverse engineered or reprogramed.
Me too believe me.
Awesome. This snowball is really starting to gain momentum.
From Wikipedia, the free encyclopedia
Intel P8051 microcontroller
The Intel MCS-51 (commonly termed 8051) is a single chip microcontroller (MCU) series developed by Intel in 1980 for use in embedded systems.
NXP Semiconductors
http://
Part No. P89LPC9222A1 P89LPC922A1FDH P89LPC922A1FN P89LPC9251 P89LPC9251FDH P89LPC9201 P89LPC9201FDH P89LPC9211 P89LPC9211FDH P89LPC9241 P89LPC9241FDH
Description 8-bit microcontroller with accelerated two-clock 80C51 core 2 kB/4 kB/8 kB 3 V byte-erasable flash
I found a data sheet for a 9211 EDIT 6-15-20 The chip is a 9211 confirmed by Twomany. so this is the data sheet for it. . Pretty sure same chip just a oem version or different package. It has several serial ports and is designed to do in-sutu flashing on a byte basis which is good. Looking at the gonzo board there is a blank header on the board that i think maybe is a jtag port.
Now figuring what to flash it with is another story. There are 8 i/o pins any of which could be the one that drives the coil for example.
I'm quite happy with the present advance curve. The bikes seem to start easily with the timing set to be fully advanced a few degrees short of stock. Even back in the 70's before the fuel became watered down I would set my timing a few degrees short of full advance except when I went to Texas World when there would be about 60/40 mix of blue gas/pump premium in the tank ,(I think the statute has ran, I hope)
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As the guys say........ there is work to be done, finishing details and research, and a lot of editing to make a tutorial thread.
I have asked the same question and there is some information starting from post #390...........
http://www.xs650.com/threads/tci-replacement-2020-it-works.57388/page-20
Jim has worked out how to mark the set point for a magnet into the Rotor starting from post #73
http://www.xs650.com/threads/tci-replacement-2020-it-works.57388/page-4
Still details to be sorted by the buzz heads..........
Some one mentioned about re-engineering and making up our own..............just remember why we don't have pamcos any more and that should answer the question...............besides for you guys in the states one of these could be done for $50.00 or less..........can't complain about that
.... a 1977 XS650 was still a points bike. In North America, the TCI wasn’t introduced until 1980 I believe.
There is no need to apologize for ignorance - we’re all learning here LY.
Pete
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Well, you guys said 5-10K on the inputs. After tearin' the garage and basement apart all day, these are as close as I can get.... 4.7k on the low side and I can series 2 of 'em for 9.4k. That's the best I can do unless I order some. Damn you Radio Shack for closing down here. 
Yep especially for us small town folks. Sadly it seems most of them had pretty much become a sprint store and if you walked looking for say a 4.7k resistor you were on your own because they had no idea what the f___ you were talking about and were too busy sitting on hold with one of the cell companies. Back when I was a kid I bought all the RS howto books and a lot of what I know about electronics came from them.
I think 4.7k will be fine across the unused coil. Even 2 of them in parallel (2.3K) will be good. I think that bad ass Fluke meter of yours( I hate people who have much .nicer play prettys than me, I want one) will measure the ac output of the the pickup so a before and after voltage reading would be informative.
Not sure what you wanted me to recheck Steve... but I'm glad I did. Here's the new box I checked yesterday... still the same.
Input neg. to gnd.... continuity
Input pos. to gnd.... 4.5megs (I'm rounding here)
input pos. to neg. ... 4.5megs
OK, so... turns out I wasn't stoned the other night when I checked. Here's the same drill on the old box.... the one I been running in my bike.
input neg. to gnd... 5.5megs
input pos. to gnd.... 5.5megs
input pos. to neg... 16.5megs
So, on my new box, the negative side of the trigger input goes to the chassis ground... just like the one Steve dissected. The old box.... the one that we know works 'cause it's the one I been road testing.... doesn't. It has a floating input... that's not grounded.
Jack, ohm your box and see what you get? Larry, Jeff and Rudy, if you guys could do the same it might help figure out what's going on.
I've got a ton of stuff to do this week, but I'll try and install the new box and run it tomorrow. See if it acts the same as the old.
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It's from my airplane days. Cheap chinese meters didn't really hack it in that world....
Try, try again.
Got a better picture of the IC.
Got a better picture of the IC.
The bad news is I've got 2 (supposedly) identical boxes that are wired completely different. That ain't exactly givin' me a warm fuzzy. I'd really like to know what the other boxes look like.
