Relocating my ecu ?

[dadsbee]

Nice!

 

[Bee1971]

How many guys , including myself , wish they would have mounted as easy with that bracket on the valley pan instead of drilling two holes on the firewall

So simple

 

[70chall440]

IMO mounting the ECU on the engine is asking for problems. The 2 things those ECUs do not like is heat and vibration and putting them on the engine is providing both in abundance. Yes it hides the ECU well but makes replacement a little more difficult, however I think what you gain in cool points in not being able to see it is not worth the shortening of its life by subjecting it to more heat and vibration. You would be better served lengthening the wires and putting it inside the car under the dash if seeing it is a problem.

But hey, if it works for you then so be it.

 

[Bee1971]

How much hotter do you think it is on the back of the valley pan versus the firewall on a hot summer day driving your car around with the hood sealed on a 71 Superbee without the ramcharger hood

I can answer that question for you when I was tracing my 5,000 RPMs and above erratic issues this past summer with a laser thermometer that I carried in the car

Now the vibration part - Well obviously that makes sense

Anyways The problem with these aftermarket factory ECUs ignition modules is the country they are made in today and within the past 20 years

 

[RJRENTON]

It is a 12v system, so there is ONLY 12v going thru the transistor. The size of the transistor is due to the current, therefore, it only gets hot during operation. A dry finger touch has approximately 40K ohm to 1M ohm resistance while the circuit resistance is a lot lower. This has the equivalency of touching a multimeter (10K ohm to 20K ohm impedance) to a circuit with very minimal circuit change (LOW current draw), and the finger touch impedance is 4x or more higher, so you will NOT get shocked. On the other hand, grab the HT coil wire if you want to curl your hair...

Touching the transistor case while in operation will result in a shock....due to the coils collapsing primary winding current that produces the spark in the first place. The transistor and related internal components are designed to harmless dissipate this voltsge. The transistor is a power Darlington design with an internal suppression network. Its NOT the steady state current the transistor handles to charge the coils PRIMARY, but the induced voltage that appears when the transistor turns OFF to produce the spark...identical to a points ignition system operates when the points OPEN.
BOB RENTON

 

[beanhead]

I mounted mine on the inside of the firewall up under the dash. I stuck some special gasket material to the firewall behind it it as well as stood it off the firewall a 1/2 inch or so to keep it isolated from engine bay heat (the firewall sheetmetal gets warm, even on the inside).

 

[Dave6T4]

Relocating my ecu on my 78 dodge magnum. Yes it had the lean burn ignition system originally..but the previous owner converted it to a orange box ecu . And I don't like that it's mounted on the passenger side inner fender sorta near the big block distributor and the exhaust manifold. My question is, how close can something be from the ecu without causing problems? I heard that it's not wise to touch the ecu as it is a shock hazzard. I myself have never accidentally touched one. And could it arc to a nearby metal surface ? Thanks in advance, Tony Tee.

 

[Dave6T4]

I hide mine on top of passenger side forward frame rail, under the horns. Then I run the wiring harness alongside the alternator harness up to the big block distributor and coil. It is practically invisible.

 

[Tony Tee]

Lots of great suggestions! Many good alternate places to relocate the ecu. Thanks!
Another thing that strikes me as a bad place to mount something is, on my old 1993 dodge 4x4 Dakota . They mounted the ignition coil on the passenger side exhaust manifold! WTF!