700R4 TCC Wiring - Page 5 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**pjmoreland** · 12-08-2021, 03:16 PM

Quote:

Originally Posted by HO455

Interest expressed! Yours is far cleaner than mine would end up being. Let me know where your at on cost when you're ready.

Cool. The cost of all the parts may end up being a stumbling block since there's risk associated with trying something that is somewhat untested. I've attached a complete parts list and the total cost for the parts. None of the prices I listed include shipping or tax.

Once I've got the latest version working, I'd be happy to send you the old one that's currently in my truck for you to try out, if you're interested. You'd just have to buy the Dakota Digital speed sensor, Arduino Nano, brake switch, 700R4 connector and wires.

**HO455** · 12-08-2021, 07:58 PM

That would be great. I already have everything except the speed signal generator. It would be cool to get the lockup converter working properly.

car46999 · 05-05-2022, 04:21 PM

Quote:

Originally Posted by pjmoreland

We will see if anyone expresses interest. I'd be happy to send a PCB, the code, and the STL file for the enclosure to anyone who wants to give it a try. The bare PCBs cost $2 plus $7 shipping from jlcpcb.com. I guess they are banking on me ordering 10,000 of these at some point. Highly unlikely!

It's been drizzling and foggy here for the last few days, so I haven't been driving my truck. I've been wanting to record a video of the controller in action, but that will have to wait. I think I have a chance of being able to drive my truck without constantly thinking about the TCC with this setup.

Hello sir, I am helping my brother with his 1987 GMC Jimmy and came across your arduino torque converter control project. His Jimmy was originally a TBI engine with a 700R4, we have now converted it to carburetor. So we need a way to control the lockup of the converter. After looking at the vacuum switch options, I felt like there must be a better way. Since I have worked with arduinos previously, I searched and came up with your posts.

I would love to get a copy of your gerber files and the arduino sketch. I looked over your parts list and I am thinking I might be able to use an OEM 1bar MAP sensor in place of the NXP sensor you used. It is a 0-5V sensor, and I already have one handy. Any thoughts on that sensor?

**pjmoreland** · 05-05-2022, 04:50 PM

Quote:

Originally Posted by car46999

Hello sir, I am helping my brother with his 1987 GMC Jimmy and came across your arduino torque converter control project. His Jimmy was originally a TBI engine with a 700R4, we have now converted it to carburetor. So we need a way to control the lockup of the converter. After looking at the vacuum switch options, I felt like there must be a better way. Since I have worked with arduinos previously, I searched and came up with your posts.

I would love to get a copy of your gerber files and the arduino sketch. I looked over your parts list and I am thinking I might be able to use an OEM 1bar MAP sensor in place of the NXP sensor you used. It is a 0-5V sensor, and I already have one handy. Any thoughts on that sensor?

Sounds like a fun project you've got there. I'd be happy to share the files with you. I received your private message, so I will send you an email shortly. I had to order five PCBs, so I've got four extras. I can drop one in the mail to you, if you'd like. If the MAP sensor is 0-5V, then it should work.

05-05-2022, 09:59 PM

Posted in error.

**pjmoreland** · 12-09-2021, 05:11 PM

The code will require a very minor tweak to ignore the 4th gear input to the Arduino. The logic to lock and unlock will be based solely on speed and vacuum then (and the brake switch). Would it be a problem if the TCC locked in 2nd gear and then the transmission upshifted to 3rd with the TCC locked? I don't think this would happen during normal driving since the speed and vacuum logic should prevent it. The transmission would likely already be in 3rd above 50mph and light throttle. I could see it happening if you were shifting through the gears manually at light throttle.

**HO455** · 12-10-2021, 11:08 PM

Quote:

Originally Posted by pjmoreland

The code will require a very minor tweak to ignore the 4th gear input to the Arduino. The logic to lock and unlock will be based solely on speed and vacuum then (and the brake switch). Would it be a problem if the TCC locked in 2nd gear and then the transmission upshifted to 3rd with the TCC locked? I don't think this would happen during normal driving since the speed and vacuum logic should prevent it. The transmission would likely already be in 3rd above 50mph and light throttle. I could see it happening if you were shifting through the gears manually at light throttle.

I don't think it would be a problem (Especially the way I drive!) I have driven in second overdrive while towing up steeper grades but the vacuum should keep the converter unlocked and if it is a problem I could deactivate the lockup circuit.

**pjmoreland** · 12-10-2021, 02:11 PM

Here's a video of the Arduino TCC controller in action:

https://youtu.be/1fJMRk6qrf0

**pjmoreland** · 12-11-2021, 03:32 AM

My friend printed the smaller enclosure for me the other day. The new PCB should be here in a couple of weeks.

**pjmoreland** · 12-20-2021, 07:40 PM

The new smaller PCB arrived today. It will be a few days before I can test it though because I'm finishing up installation of a Boyd tank.

The Arduino in the photos isn't the right one. I just placed it in there to check the fit.

**pjmoreland** · 12-23-2021, 10:20 PM

Finally got around to installing the new controller. Now there is room for my hand on the parking brake. I wouldn't say there's lots of room, but there's enough. I haven't had a chance to take it for a test drive.

HO455 - I've got the old box ready to send to you to try out if you're still interested. PM me your address and I'll drop it in the mail next week.

**HO455** · 12-27-2021, 07:50 PM

PM sent along with much appreciation.

**pjmoreland** · 01-03-2022, 12:34 AM

Finally got to go for a test drive with the new smaller Arduino controller installed, and it is fully functional. The vacuum trip points are slightly different, so I will need to recalibrate the vacuum sensor.

Accelo · 01-10-2022, 03:34 AM

Here is what is for sale on the market today. TC-71 GM Torque Converter Lock-up
Part #: TC-71
https://www.ronfrancis.com/product/294
Doesn't have all the work of features and the cost is $220.95.
This system by pjomeland not only is a bargain but of a much better design.
My bet is there isn't any comparison on drive ability
Cheers and great job pjomeland.

**pjmoreland** · 01-10-2022, 03:38 AM

Thank you, Accelo. That Ron Francis kit appears to be similar to this one from B&M. Neither have a vacuum sensor.

https://www.holley.com/products/driv...er/parts/70244

SCOTI · 01-11-2022, 07:29 PM

I came across this earlier today so when I was done for the day @ work I read through from the start. Very impressive effort & logic.

Well done @pjmoreland !

**pjmoreland** · 01-11-2022, 07:51 PM

Quote:

Originally Posted by SCOTI

I came across this earlier today so when I was done for the day @ work I read through from the start. Very impressive effort & logic.

Well done @pjmoreland !

Thanks, SCOTI. My setup sure changed over the course of this thread. I kind of wish the relay/vacuum switch setup would have worked out better than it did. It's hard to beat the functionality of a microcontroller in an application like this though!

SCOTI · 01-11-2022, 08:20 PM

Quote:

Originally Posted by pjmoreland

Thanks, SCOTI. My setup sure changed over the course of this thread. I kind of wish the relay/vacuum switch setup would have worked out better than it did. It's hard to beat the functionality of a microcontroller in an application like this though!

Agreed. Exactly!

**pjmoreland** · 01-17-2022, 12:28 PM

I noticed that sometimes my Arduino TCC controller was locking the TCC at speeds slightly lower than 50mph. I collected some speed data and discovered random speed spikes. I believe this is occurring due to electrical noise causing phantom signals on the digital input that's reading the speed sensor. I had the speed sensor cable zip tied to the bundle of other wires going to the controller, so I separated it. This reduced the number of spikes slightly. I also added a 4.7k pull-up resistor to the digital input, and this reduced the number and size of the spikes significantly. I was still seeing the occasional spike though, so I made some software modifications to filter them out. Basically the code is calculating the acceleration or deceleration rate from one speed data point to the next, and it is throwing out any points that show an unrealistic accel/decel rate.

The first graph below was with the pull-up resistor installed. The spikes were much larger previously. I failed to save a recording from before though. The vertical lines going all the way down to zero on the first graph is just where the TCC locked or unlocked, and I had "TCCON" and "TCCOFF" in my data list, so these aren't issues with the signal. The significant thing is all the little spikes all over the place.

The second graph below is with the cable separated from the other wires. It shows one large group of spikes and some jitter at higher speeds. This is also a graph of the raw signal without any averaging. That's why it doesn't look as smooth as the previous graph.

The third graph shows the spikes being filtered out by the software.

**Rich72C10** · 01-17-2022, 12:45 PM

Ahh, squashing those bugs I see! Love watching you do this and tweaking your design. Nothing better than a User/Hardware Designer/Software Developer all mixed into one!

Though it would be cool if you could speed up / slow down like that .... perhaps with a flux capacitor added to your engine ;-)

**pjmoreland** · 01-17-2022, 12:49 PM

Quote:

Originally Posted by Rich72C10

Ahh, squashing those bugs I see! Love watching you do this and tweaking your design. Nothing better than a User/Hardware Designer/Software Developer all mixed into one!

Though it would be cool if you could speed up / slow down like that .... perhaps with a flux capacitor added to your engine ;-)

I love the Back to the Future movies. I've watched them countless times. Yes, I'm a nerd...

**BigBird05** · 01-17-2022, 05:44 PM

It might help your spikes if you braid the wires or at least twist they. When we first started making anti-lock brake harness's we braded them an added shielding. AkA aluminum foil.

**pjmoreland** · 01-17-2022, 05:46 PM

Quote:

Originally Posted by BigBird05

It might help your spikes if you braid the wires or at least twist they. When we first started making anti-lock brake harness's we braded them an added shielding. AkA aluminum foil.

You are 100% right. I'm hoping to get away with being able to use the stock cable that comes with the speed sensor to simplify the wiring. I will switch to shielded/twisted pair cabling if the latest setup doesn't end up working reliably. Some of the electrical noise issues may be inside the controller box itself.

**pjmoreland** · 01-22-2022, 01:56 AM

I've done a couple of hour+ freeway drives over the last few days, and the TCC controller is working consistently with no glitches.

I'm considering moving the vacuum sensor to manifold vacuum instead of the timed vacuum port on the carb because it is slightly distracting to have the TCC unlock and then re-lock every time I coast momentarily due to traffic. I'm not sure there would be a downside to this change. I was using timed vacuum for my old vacuum switch & delay relay setup to unlock when coasting down to a stop. That's no longer necessary because the Arduino will unlock under 45mph.

**pjmoreland** · 02-14-2022, 02:30 AM

I moved the vacuum sensor from timed vacuum to manifold vacuum. This change keeps the TCC locked when coasting. I like this better because I found it distracting to have the TCC unlock and relock each time I let off the throttle in traffic. Initially I connected the sensor to the same vacuum fitting that my brake booster is connected to on the rear of the intake manifold, but for some reason the vacuum level was erratic there. I ended up teeing into the hose that runs from the front of the carb to the distributor vacuum advance.

12-08-2021, 07:58 PM	#2
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,867	Re: 700R4 TCC Wiring That would be great. I already have everything except the speed signal generator. It would be cool to get the lockup converter working properly. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

05-05-2022, 09:59 PM	#5
67Fbird Guest Posts: n/a	Re: 700R4 TCC Wiring Posted in error. Last edited by 67Fbird; 05-05-2022 at 11:16 PM. Reason: Posted in error.

12-09-2021, 05:11 PM	#6
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,327	Re: 700R4 TCC Wiring The code will require a very minor tweak to ignore the 4th gear input to the Arduino. The logic to lock and unlock will be based solely on speed and vacuum then (and the brake switch). Would it be a problem if the TCC locked in 2nd gear and then the transmission upshifted to 3rd with the TCC locked? I don't think this would happen during normal driving since the speed and vacuum logic should prevent it. The transmission would likely already be in 3rd above 50mph and light throttle. I could see it happening if you were shifting through the gears manually at light throttle.

12-10-2021, 02:11 PM	#8
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,327	Re: 700R4 TCC Wiring Here's a video of the Arduino TCC controller in action: https://youtu.be/1fJMRk6qrf0

12-11-2021, 03:32 AM	#9
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,327	Re: 700R4 TCC Wiring My friend printed the smaller enclosure for me the other day. The new PCB should be here in a couple of weeks. Attached Images

12-20-2021, 07:40 PM	#10
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,327	Re: 700R4 TCC Wiring The new smaller PCB arrived today. It will be a few days before I can test it though because I'm finishing up installation of a Boyd tank. The Arduino in the photos isn't the right one. I just placed it in there to check the fit. Attached Images

12-23-2021, 10:20 PM	#11
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,327	Re: 700R4 TCC Wiring Finally got around to installing the new controller. Now there is room for my hand on the parking brake. I wouldn't say there's lots of room, but there's enough. I haven't had a chance to take it for a test drive. HO455 - I've got the old box ready to send to you to try out if you're still interested. PM me your address and I'll drop it in the mail next week. Attached Images

12-27-2021, 07:50 PM	#12
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 10,867	Re: 700R4 TCC Wiring PM sent along with much appreciation. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377

01-03-2022, 12:34 AM	#13
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,327	Re: 700R4 TCC Wiring Finally got to go for a test drive with the new smaller Arduino controller installed, and it is fully functional. The vacuum trip points are slightly different, so I will need to recalibrate the vacuum sensor.

01-10-2022, 03:34 AM	#14
Accelo Registered User Join Date: Mar 2015 Location: washington Posts: 2,177	Re: 700R4 TCC Wiring Here is what is for sale on the market today. TC-71 GM Torque Converter Lock-up Part #: TC-71 https://www.ronfrancis.com/product/294 Doesn't have all the work of features and the cost is $220.95. This system by pjomeland not only is a bargain but of a much better design. My bet is there isn't any comparison on drive ability Cheers and great job pjomeland.

01-10-2022, 03:38 AM	#15
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,327	Re: 700R4 TCC Wiring Thank you, Accelo. That Ron Francis kit appears to be similar to this one from B&M. Neither have a vacuum sensor. https://www.holley.com/products/driv...er/parts/70244

01-11-2022, 07:29 PM	#16
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 21,917	Re: 700R4 TCC Wiring I came across this earlier today so when I was done for the day @ work I read through from the start. Very impressive effort & logic. Well done @pjmoreland ! __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

01-17-2022, 12:28 PM	#19
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,327	Re: 700R4 TCC Wiring I noticed that sometimes my Arduino TCC controller was locking the TCC at speeds slightly lower than 50mph. I collected some speed data and discovered random speed spikes. I believe this is occurring due to electrical noise causing phantom signals on the digital input that's reading the speed sensor. I had the speed sensor cable zip tied to the bundle of other wires going to the controller, so I separated it. This reduced the number of spikes slightly. I also added a 4.7k pull-up resistor to the digital input, and this reduced the number and size of the spikes significantly. I was still seeing the occasional spike though, so I made some software modifications to filter them out. Basically the code is calculating the acceleration or deceleration rate from one speed data point to the next, and it is throwing out any points that show an unrealistic accel/decel rate. The first graph below was with the pull-up resistor installed. The spikes were much larger previously. I failed to save a recording from before though. The vertical lines going all the way down to zero on the first graph is just where the TCC locked or unlocked, and I had "TCCON" and "TCCOFF" in my data list, so these aren't issues with the signal. The significant thing is all the little spikes all over the place. The second graph below is with the cable separated from the other wires. It shows one large group of spikes and some jitter at higher speeds. This is also a graph of the raw signal without any averaging. That's why it doesn't look as smooth as the previous graph. The third graph shows the spikes being filtered out by the software. Attached Images Last edited by pjmoreland; 01-17-2022 at 02:16 PM.

01-17-2022, 12:45 PM	#20
Rich72C10 Mr. Cheyenne Join Date: Jun 2020 Location: Kyle, Texas Posts: 1,644	Re: 700R4 TCC Wiring Ahh, squashing those bugs I see! Love watching you do this and tweaking your design. Nothing better than a User/Hardware Designer/Software Developer all mixed into one! Though it would be cool if you could speed up / slow down like that .... perhaps with a flux capacitor added to your engine ;-) __________________ Richard *'72 Chevy C10 Cheyenne Super WHT/MED BRONZE/WHT SBC 350 \| TH350 \| LWB \| AC \| Buddy Seats Upgrades:** Tilt \| Front Sway Bar \| Radio \| Sliding Window \| Bed Spare w/Lock Bed Rails \| Full LEDs \| Courtesy Lights \| Tachometer \| Glovebox Lock & Light \| Head Light Relays \| *Upgraded Fully Super Trim

01-17-2022, 05:44 PM	#22
BigBird05 Senior Member Join Date: Aug 2019 Location: Cheraw Posts: 1,305	Re: 700R4 TCC Wiring It might help your spikes if you braid the wires or at least twist they. When we first started making anti-lock brake harness's we braded them an added shielding. AkA aluminum foil.



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01-22-2022, 01:56 AM	#24
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,327	Re: 700R4 TCC Wiring I've done a couple of hour+ freeway drives over the last few days, and the TCC controller is working consistently with no glitches. I'm considering moving the vacuum sensor to manifold vacuum instead of the timed vacuum port on the carb because it is slightly distracting to have the TCC unlock and then re-lock every time I coast momentarily due to traffic. I'm not sure there would be a downside to this change. I was using timed vacuum for my old vacuum switch & delay relay setup to unlock when coasting down to a stop. That's no longer necessary because the Arduino will unlock under 45mph.

02-14-2022, 02:30 AM	#25
pjmoreland Senior Member Join Date: Jan 2005 Location: CA Posts: 5,327	Re: 700R4 TCC Wiring I moved the vacuum sensor from timed vacuum to manifold vacuum. This change keeps the TCC locked when coasting. I like this better because I found it distracting to have the TCC unlock and relock each time I let off the throttle in traffic. Initially I connected the sensor to the same vacuum fitting that my brake booster is connected to on the rear of the intake manifold, but for some reason the vacuum level was erratic there. I ended up teeing into the hose that runs from the front of the carb to the distributor vacuum advance.

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