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View Full Version : Trivia Question........anyone know what this Vette Doctors Black Box is?

Rumbln70SS
08-02-2014, 07:49 AM
Found this black box on my car recently and not sure what it is. I'm going to call Vette Doctors this week as I'm sure they know. The builder, Clint Hooper thinks it is to adjust the speedometer when the rear gears were changed. It appears to be spliced into the ECM wiring as well.

Any input is appreciated!

http://i337.photobucket.com/albums/n389/Rumblin70SS/ZR-1/3882160A-9EBD-4E7F-A17C-50CFF2B522F9_zpsqnkgozhg.jpg (http://s337.photobucket.com/user/Rumblin70SS/media/ZR-1/3882160A-9EBD-4E7F-A17C-50CFF2B522F9_zpsqnkgozhg.jpg.html)
mike100
08-02-2014, 02:54 PM
I guess if you could ID the exact pins on the ecm it is spliced in series with, you could probably figure out what it is doing. A speedo pulse box sounds likely if you have a different gear ratio.
Arctic91
08-02-2014, 03:02 PM
I've got one of those boxes too, so I would be interested to hear what you learn about it. Car had a lot of work done by VD and it does have 4.10s.
Rumbln70SS
08-02-2014, 04:40 PM
I guess if you could ID the exact pins on the ecm it is spliced in series with, you could probably figure out what it is doing. A speedo pulse box sounds likely if you have a different gear ratio.


I've got one of those boxes too, so I would be interested to hear what you learn about it. Car had a lot of work done by VD and it does have 4.10s.

Thanks guys, I'll start tracing things down if they don't have any info. I just find it hard to believe that something this complex is to correct the speedo. I had one in my 1993 Firehawk from around 2000 and iit was so much simpler.
USAZR1
08-02-2014, 07:25 PM
The reason I thought it might be related to the gear swap,is that 4.27's were installed. In 1998,the ratio choices were 3.92,4.09,and 4.27. The new Super 44 ring & pinions weren't available,yet.
Rumbln70SS
08-03-2014, 07:47 AM
The reason I thought it might be related to the gear swap,is that 4.27's were installed. In 1998,the ratio choices were 3.92,4.09,and 4.27. The new Super 44 ring & pinions weren't available,yet.

I believe you are probably right Clint since you know these cars better than most. It will be interesting to hear from Vette Doctors next week.
Rumbln70SS
08-08-2014, 08:47 PM
Talked with Vette Doctors today.........drum roll please :)

It's for adjusting the speedo after a gear change.....I was shocked!

Clint was right and the best thing about it is they remembered the car.
USAZR1
08-09-2014, 01:15 AM
You have a great car,Tony. Hope you enjoy it as much as you can.
Rumbln70SS
08-10-2014, 09:09 PM
You have a great car,Tony. Hope you enjoy it as much as you can.

I will Clint, although my daily driver has been killing us lately!
cvette98pacecar
08-10-2014, 09:31 PM
That is an ERA. Electronic Ratio Adapter.
Pete
08-11-2014, 04:47 AM
just saw this.
It's a speedo correction,which you found out already.

Looks like the old design from www.dakotadigital.com (http://www.dakotadigital.com)

Pete
Rumbln70SS
08-11-2014, 09:45 PM
Thanks again guys and Pete your car is amazing!
Pete
08-12-2014, 09:02 AM
Thanks again guys and Pete your car is amazing!

Thanks
I see you have a nice collection.

Pete
Arctic91
08-12-2014, 12:41 PM
Tony, thanks for posting the info!!

Scott