Everything about CB Performance Black Box

[NJ John]

Is the black box also a captive discharge system? As in, it replaces a MSD box?
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1973 standard, yellow, lowered, 3” narrowed front, 1600 blo-thru turbo w/single dell 15.4@86, so far
11.41 et buggy. Long gone
Let’s go O’s! Let’s go O’s!
https://www.youtube.com/@AirSpooledGarage

[slayer61]

No John. It's just another way to control timing. No boost in voltage


From the CB website

[NJ John]

I thought it was too good to be true. All in one BTM is like $700 nowadays.
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1973 standard, yellow, lowered, 3” narrowed front, 1600 blo-thru turbo w/single dell 15.4@86, so far
11.41 et buggy. Long gone
Let’s go O’s! Let’s go O’s!
https://www.youtube.com/@AirSpooledGarage

[clonebug]

[Lo Cash John]

Has anyone thought about using "flying magnet" crank trigger to fire the black box?

Basically you set 2 magnets into the pulley (only 2 because crank turns 2x the distributor speed), then use an MSD sensor on a bracket to detect the magnets passing. This puts out the exact same signal as the MSD Pro Billet distributor with magnetic pickup. Wiring it would be the exact same as the "Magnetic Trigger Coil Wiring" schematic included with the instructions.

The advantage here is you can set the crank sensor where you need for correct timing THEN twist the distributor to the proper position to optimize rotor to plug wire terminal alignment.

Tiny little rare earth magnets are cheap on Amazon. The MSD sensor is about $110 or so. That's some extra cost but you gain a lot. No more timing scatter due to distributor drive gear slop (the distributor angle no longer effects the spark timing event), no more rotor alignment issues, you can use a big cap distributor and not worry about point float because there are no modules for that unit (I don't think there are ignition modules for that unit) and you can wow your friends.
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www.LoCashRacing.org
More brains than bucks...Believe it or not!!

If you actually drive your VW, you need www.AirMapp.com

My boss told me I need to work on my mutli-tasking. So now when I use the bathroom at work I surf The Samba on my iPhone.

[NJ John]

[daos]

there's a new system out from debbies aircooled. not much more expensive - if it had been available when i bought my BB i wouldn't have thought twice.

[Lo Cash John]

I know a guy with the system from Debbie's Aircooled. He's been struggling with it a lot. Issues MIGHT be installation related but I can't say for certain yet.
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www.LoCashRacing.org
More brains than bucks...Believe it or not!!

If you actually drive your VW, you need www.AirMapp.com

My boss told me I need to work on my mutli-tasking. So now when I use the bathroom at work I surf The Samba on my iPhone.

[daos]

would be interesting to hear more about it, seem a bit thin on the ground currently. don't doubt it'll be too long before they have their own thread though.

[slayer61]

[clonebug]

[allamaabroad]

[boxer74]

[chrisflstf]

Anybody have any ideas about what would cause timing jitter with the BB? I get 2 degrees random, with spikes to 4 degrees, advanced, at idle. Take the BB out, run a locked out big cap at 14 idle. Rock steady, less than 1 degree.
Did this test 4x, on 2 motors now, same thing.
Hot and ground for the BB is direct to the battery.
I added a separate ground to the distributor body as well.
No point wires near the plug wires. BB is about 18 inch from motor. Idle timing matches the dashboard good.
Just put in a fresh set of resistor plugs, new plug wires and did a valve adjust. No help.
Tried a wide tip rotor, like magnaspark has. No change.
I also redownloaded the standard single carb file. No change

Dwell is 50. Idle is about 900 Rpm My dashboard says its version 2. If someone can check theirs please?

Im out of ideas and ready to dump this thing – no trust in it. BTW I spent 44 years in electronics so I have some experience there, if that matters

It starts and runs “ ok”, but the jitter is unacceptable to me

[Alstrup]

Upload a picture of the map
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https://www.thesamba.com/vw/forum/viewtopic.php?t=435993

[chrisflstf]

Its just the standard single carb map that comes with the bb. I havent changed anything. Im not using manifold vacuum - just want timing control

[jimmyhoffa]

I have the exact same problem. Mine ONLY happens at idle though. Is that the case for you as well?

My strategy when it warms up is to just start shielding and grounding random things that I think might matter. I'm sure you know this being in the electronics industry for 3x as long as me, but if you fail some noise tests for something on a machine for UL and pay the test lab to fix it, they solve the problem the same way. As a young pure engineer I used to think that the UL lab techs were like some sort of interference and noise gods, but they just try shielding stuff and putting chokes on suspicious wires and grounding stuff until it shuts up and then they send you a ridiculous invoice.
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1974 Chenowth 2RL #1244 Street Legal
My other car isn't ridiculous.

[chrisflstf]

Since the distributor is the only common denominator here, Im gonna try another, although I don’t think that is the issue, but we’ll see. Its freshly rebuilt with a good set of SMP points

Also, I have a 2nd BB, that Jeff Paull gave me few years ago. He suspected it of having issues with it randomly dying. It gives me the same idle timing jitter.

Im also going to reinstall all the CB S/W on my laptop, in case by chance I have an old file

Maybe other guys have this issue and either don’t know or don’t care? I think it’s a design issue myself, but I don’t know what circuitry is inside, so cant speculate on that

I did make this nifty bracket to mount it on a 36hp air cleaner bracket to mount to the existing fan shroud holes

Last chance for the bb or you are outta here!

[BFB]

[chrisflstf]

Yep, plan was to add manifold vacuum with a CB vacuum ref kit for the dcoe later. The bb is currently on a mostly stock carb motor, centermount, used motor I have for testing. Ive had the bb on both motors already

Ive been wondering if its points bounce the bb is seeing, causing the jitter ?

https://www.cbperformance.com/product-p/2040.htm