Where to get ECU for Catalytic Converters?

hey dad, if you do a search i think there is a thread with a guy that built the ecu. also i have a 348 ts and one of the 2 ecu 's went bad. with my car when the slow down light came on it would shut down half of the motor, not sure if your set up is the same. anyway here is a website you might want to try. good luck .
www.allferrariparts.com

 

Why not disconect the ECU and measure the voltage etc from the wires that supply it

 

Birdman, since the ECU does not feedback to the engine management system. Have you considered the "round" file? Appears to be worthless bagage to me. JMHO.

 

Of course, if there were a REAL problem, the cost and inconvenience of a fire/meltdown wouldn't be a factor? Spend the money, like insurance it's a pain in the a$$, but very comforting. Just my $0.02.

Of course, like other shops, I only have to repair fire damage a few times a year on these models, but it costs many times $400. your choice.

Brian

 

Birdman,

You have PM.

 

Brian, point well taken!
Birdman, pull the thermocouple and heat with a propane torch. You will reach "overheat" temperature quickly! Provided the thermocouple still functions! Are you sure the ECU is faulty and not the thermocouple reading an incorrect heat condition?

 

Birdman,
The specs are empericly deriveable:

The voltage generated by a thermocouple junction varies depending on the metals making up the junction. The junctions have long been standardized & identified using Alphabetic type designations:

Type | Conductors – Positive - Negative |voltage (µV/°C)
B Platinum-30% rhodium Platinum-6% rhodium | 0.05
R Platinum-13% rhodium Platinum | 5.93
S Platinum-10% rhodium Platinum | 6.02
E Nickel-chromium alloy Copper-nickel alloy | 60.93
J Iron Copper-nickel alloy | 51.71
K Nickel-chromium alloy Nickel-aluminum alloy | 40.46
T Copper Copper-nickel alloy | 40.69

Note that they fall into a couple of sets:
a LOW voltage set that puts out ~6 µV/°C
a HIGH voltage set that puts out ~50 µV/°C

My SWAG is that one of the high voltage types was used, probably a type J as the materials are common,cheap, & are fairly inert at high temps.

For precision measurements, the heated junction is normally differentially compared to a 'reference' junction held at a known temperature. However, my SWAG is that the temperature being measured is O(150-200°C), and the exact temp isn't critical, just needs to be within 50°C or so. So keeping the ref. junction at ECU temp s/b just fine.

The ECU setpoint voltage & hysterisis(if any) can be determined by using a high impedence voltmeter across the inputs to a good ECU, heating the sensor, and noting the voltage at the point that the slow down light turns on & off. The actual setpoint temp could be measured by using a calibraited thermocouple thermally connected to the temp sensor. Many auto service DVMs come with a thermocouple & can read temp. (Birdman, yes, I have one.)

 

I have an 83 308QV you can have mine if you want them.
I don't need them.

Paul

 

I expect these are typical Type K thermocouples, and that the setpoint is on the order of 1500-1600 degrees F.

IIRC they had yellow connectors under the car which is the standard color for Type K, and modern cats are limited to 1650-1700 degrees F.

 

I responded to your PM and will pull mine out on Monday and send it to you......Free.

Your fuse blocks were the deal of the century so consider this a deal returned.

Paul

 

That parts bin still remains under the passenger mats but this is a good excuse to clean it out on Monday. Will send out on Tuesday.

Paul

 

Happy Holidays Jonathan and all. Sorry to drag up this old thread.

Does anyone have (or know where to get) a thermocouple for my '78?

 

You can have mine, as my cats are gutted. It's from an 83 Mondial 308QV, but I'll bet it will work. Send me a pix and I'll compare.

 

Were here for you, Boss.


_J

 

Thank you very much sir. I'll take a pic in the next couple days.

Thanks again.

 

Here's a pic of what I'm looking for:

TIA

Henry
[email protected]
(805) 644-0055
Image Unavailable, Please Login

 

Still looking (no responses).

Anyone got one???

 

I'm sorry, I thought you were looking for the ECU's. I do have the thermocouples, but they're just being used as plugs in the cats. I cut off the wires at the end of the "spring" (stress relief) as shown in your pix. Sorry, I should of thought of others, before I cut them. Maybe the spring part could be cut back and the a new wire joined. You're welcome to try.