Need New ECU

Ranger16 · Aug 9, 2020

Hey guys, my car failed to start. Swapped in my back up ECU (Orange Box) #P4120505 and she fired right up. Searching for a replacement and they all say "Discontinued", "Unavailable" or "No Longer Available". WTF? Anyone aware of this? Do I now have to go with the blue box? I assume that the only difference is the RPM rating?

Before anyone suggests it, no I really don't want to switch systems. I just want a back up that I can plug n play if needed.

On a side note, after the 3rd attempt to start (I thought maye the float bowls where dry), it stopped cranking abruptly. I found the negative battery post and connector very hot. New battery (12.56v) and good clean, tight connections. Maybe normal, but seemed odd to me.

F4R/T · Aug 9, 2020

I’d look for any brand of older boxes with made in USA on it , I think those maybe a safer bet than the chisneeze stuff that’s coming off the boat!

yella71 · Aug 9, 2020

There's a guy on the board, Halifax shops, i think will hook you up

dadsbee · Aug 9, 2020

@HALIFAXHOPS

kiwigtx · Aug 9, 2020

Ranger16 said:
Hey guys, my car failed to start. Swapped in my back up ECU (Orange Box) #P4120505 and she fired right up. Searching for a replacement and they all say "Discontinued", "Unavailable" or "No Longer Available". WTF? Anyone aware of this?

I know this is not a WTB Advertisement, but I just happen to have a brand new one of those Orange boxes on my desk right now. Dated 06/09/09, Made in USA, #P4120505
If no-one is able to hook you up, and two weeks is no issue, I could send this one over to you.

kiwigtx · Aug 9, 2020

Proof of it being 'in hand'.....

SlinktRR · Aug 9, 2020

Go for the chrome box, they don't fail. The Rev n nator is good too but about five times the price. The rev limiter is nice. I use both of these, gave up on orange boxes they will leave you stranded.

dadsbee · Aug 9, 2020

Never left me stranded in 45 years...

SlinktRR · Aug 9, 2020

I just saw chrome box is no longer produced. Bummer. Gold box is still around on Mancini but I think that's race only.

Nacho-RT74 · Aug 10, 2020

SlinktRR said:
Go for the chrome box, they don't fail. The Rev n nator is good too but about five times the price. The rev limiter is nice. I use both of these, gave up on orange boxes they will leave you stranded.

Don't fail? You tell me! 3 Chromed boxes in a row in 2 years! LOL

67belsat · Aug 10, 2020

try the hi rev 7500 from rick ehrenberg he's on ebay they work good

Ski 61701 · Aug 10, 2020

Ranger16 said:
Hey guys, my car failed to start. Swapped in my back up ECU (Orange Box) #P4120505 and she fired right up. Searching for a replacement and they all say "Discontinued", "Unavailable" or "No Longer Available". WTF? Anyone aware of this? Do I now have to go with the blue box? I assume that the only difference is the RPM rating?

Before anyone suggests it, no I really don't want to switch systems. I just want a back up that I can plug n play if needed.

On a side note, after the 3rd attempt to start (I thought maye the float bowls where dry), it stopped cranking abruptly. I found the negative battery post and connector very hot. New battery (12.56v) and good clean, tight connections. Maybe normal, but seemed odd to me.

I have a Napa TP50 ECU thats at least 25 yrs old brand new in the box never been mounted. Has MADE IN USA stamped on it. I also have an MO20 cap with brass terminals brand new as well. I can help you out if you cant find a Orange box. Best part is I'm about 2hrs away from you. Just let me know.

HALIFAXHOPS · Aug 10, 2020

I have some tested used and tested new boxes, have to get some pics, nothing new NORS. Here is what may help you ID what you want.

HALIFAXHOPS · Aug 10, 2020

Biggest reason for ECU failure that I have found out is a mis matched ballast resistor and cooling. Think the E bodies make a mount that stands away from the firewall and lets air flow behind.

Of course the new stuff generally sucks also.

91r/t · Aug 10, 2020

Yea all the Mopar boxes that are newer suck. The Chrome and the Orange have both failed me in less than a years time so I went RevNnator and have been happy with that ever since. FBO ignition also makes a nice unit.

HALIFAXHOPS · Aug 10, 2020

We got into this pretty hard on FABO. We have a member retrofitting them with 4 pin GM hei's and was pretty surprising what differences there are inside. Some have just a chip, quite a few have false transistors on the front, bad potting material that let moisture in etc. The older Mopar ones are pretty consistent. Big clue is what is on printed on the transistor itself. RCA and Motorola and Prestolite I believe are real ones. Any thing else either false or junk.

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FU64RY · Aug 10, 2020

My (Orange) went bad a month ago went to Advance for a blue box Less than $25, Installed it and it was like I did a major tune up. How long it lasts is the question.

HALIFAXHOPS · Aug 10, 2020

I got some of the older blue boxes, at least testing never had one fail, now orange and chrome are a crap shoot, usually at higher (5000) rpm they have issues.

SlinktRR · Aug 10, 2020

Nacho-RT74 said:
Don't fail? You tell me! 3 Chromed boxes in a row in 2 years! LOL

Yeah, I haven't had to buy a chrome since 2012 so quality has most likely changed. The one I have performs really well with a blaster 2 coil and an msd 0.8 ohm ballast resistor.

Nacho-RT74 · Aug 10, 2020

sure... the chrome box is AWESOME!!! when it works. LOL. ( I have same resistor and coil )

The last versions of al MP failed due ground failure into the PCB and power transistor quality

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