moparlee
64 Valiant
I was thinking of trying this box....since who ever makes it put it on the outside.
1974 Brain Box saves the day.
- Thread starter George Jets
- Start date
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I was thinking of trying this box....since who ever makes it put it on the outside.
LOL yes they are! Wonder how that will hold up in the open without moisture protection?
pishta
I know I'm right....
These are hermetically sealed, getting a distilled water rinse after the solder process, and possibly every time you run it in the rain!
I would be leery of it. Better than potted inside though that will retain the heat. Thats why they used the TO3 design on them.
I think it would work just fine. Make sure you have enough clearance so the leads don’t short to the heat sink. Seal up the leads with some high temp red rtv. Should be good to go.
I do like it better. Needs some sort of sealant that will let the heat out IMO
I kind of wonder if that is made by a guy asking me a crap load of questions on them one day. Good for him.
Yeah, good point, the rtv doesn’t need to be applied too heavily, just enough to seal the leads.
However, since it is on a heat sink (assuming using good thermal grease from a computer use) all the heat transfer will occur through the heat sink and not the body of the part, so covering it may not matter.
I would seriously worry about moisture inside of the chip itself. I workrd on aircraft for years and temp changes do weird things especially brining moisture inside of components. Dont get me wrong great some one is working on this.
Kind of went Dr Frankenstein yesterday testing all the different ecu's I have with different value ballast resistors. Now I have to make a spreadsheet for the results. Kind of interesting to do to me. Definately affects the heat generated and where they fail RPM wise.
moparlee
64 Valiant
Awesome stuff...thanks for sharing.
bee1971
Well-Known Member
Excellent - Awesome setup !
I see in that top photo your running a factory Chrysler ECU #3874020 5 Pin
Is that a Standard UC12 Coil - 1.5 OHM ?
That’s why I was asking about different combinations and RPMs , as I have tested so many of these on my car with different results , and RPM breakdown from 4500 RPMs - 5500 RPMs etc.
Coils are the biggest issue , especially reliability on the street - I stay away from the Blaster 2 coils or anything with a lower resistance designed for CDI Ignition type systems
Accel - Pertronix - Edelbrock etc. all make so called Performance type oil filled canister coils with a Primary resistance of around 1.5 OHMs
Standard SMP has there UC12
Even those factory Chrysler ECUs seem to breakdown around 5000 - 5500 RPMs , but again that could be an result of these Chinese oil filled canister coils - Ballast Resistors vary from .5 to 1.5 OHM resistance that are available today
Like I mentioned earlier Mopar doesn’t make those .25 OHM resistors anymore along with there Mopar Performance ECUs or a made in the USA canister oil filled coil
Would like to see some of your results when you have a chance
Peace , thanx for your time
In a nutshel the lower the ohm ballast produces more heat and increases the performance. Hence will make the ecu fail usually. They really have to be matched for the proper performance. Most of the stock black MOPAR boxes are limited to about 5500.
Wow great example of a New orange box with a fake transistor.
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