Anyone recognize this chip???

[chrisbruck]

Bought my car in June and the service records indicate a chip was installed in 1993. I finally opened up the Motronic box to see this....



Can someone tell me what chip this is? I have the itch for a Steve Wong chip but would like to know what this is for comparison.

Thanks!

[86 911 Targa]

Sometimes Google is your best friend hope this helps:

HN482732AG-20 datasheet and application note, data sheet, circuit, pdf, cross reference | Datasheet Archive

[chrisbruck]

Sorta helps.... curious what company this chip is from so I have a basis for comparison.

[Quicksilver]

The type of chip makes no difference. The data that was burning into it is the only important thing and you can burn anything onto a ROM. There is no way to know what it is unless you know someone with a chip reader and then have the data from various chips to compare it to. That will cost more then a new chip...

All we know is it is "something" and it isn't stock. It doesn't have the sticker with a number on it that almost any manufacturer would put on it.

[McLaren-TAG]

be careful! the sticker is missing.... it is there as a functional part as those EPROMs were erased with a ultra violet light so cover it up, electrical tape will do just fine.

[chrisbruck]

Hmm, I just put it all back together without putting tape on it. It made it since 1993 so I think a few more weeks before I get "Wonged" won't hurt.

[HawgRyder]

McLaren-Tag is correct...anything from a baseline stock configuration to the latest plans for an electron drive engine could be programmed on that chip.
And yes if the window is not covered...eventually the chip WILL erase!!
The only time the chip is referenced is when the ECU is reset (power removed and re=powered after a few minutes)...after that...the ECU "learns" ...so when you replace air filters...plugs...etc...please reset the ECU so that it accepts the new parts.
Bob

[Quicksilver]

Originally Posted by HawgRyder

McLaren-Tag is correct...anything from a baseline stock configuration to the latest plans for an electron drive engine could be programmed on that chip.
And yes if the window is not covered...eventually the chip WILL erase!!
The only time the chip is referenced is when the ECU is reset (power removed and re=powered after a few minutes)...after that...the ECU "learns" ...so when you replace air filters...plugs...etc...please reset the ECU so that it accepts the new parts.
Bob

A couple things wrong here...

- The chip is inside a metal box. There is no UV inside so it won't get erased. (It is still best to cover the window...)

- The DME doesn't "learn" and doesn't have RAM that it loads the ROM's data to. It is constantly reading from the maps directly in the ROM to select the fuel and ignition settings. Hooking to this to change those settings on the fly is how a "piggy back system" works.
Things changed after the OBDII systems came into place. Those are required to have some non volatile memory because they have some pretty ambitious requirements.

[ToddM]

Originally Posted by chrisbruck

Sorta helps.... curious what company this chip is from so I have a basis for comparison.

Its a Hitachi; I'm in the electronics industry

[Quicksilver]

Oh , and back to the original poster...
Get that DME updated to 28 pin when you go to change the chip. It is a worthy upgrade.

[chrisbruck]

Ordered a Steve Wong 24 pin chip this AM.... the return policy made it a no-brainer in case the difference between his and what I have in their now isn't that noticeable.

My current chip has a definite lag until it hits 4k and then pulls pretty hard. I'd gladly trade for more low and midrange grunt than all out high rpm power.

[Dave Colangelo]

Even though the chip was in a metal box this picture was taken out of the box which means the chip was/is exposed to ambient UV light. All it takes is a single word in memory being erased to cause an issue.

Regards
Dave

[Quicksilver]

Originally Posted by Dave Colangelo

Even though the chip was in a metal box this picture was taken out of the box which means the chip was/is exposed to ambient UV light. All it takes is a single word in memory being erased to cause an issue.

Regards
Dave

The erasing process takes a LOT of UV energy so it isn't much of a risk. Once again: It should be covered... But we don't know what the chip is so it is a throw away anyway.

From Wikipedia:
"The process takes several minutes for UV lamps of convenient sizes; sunlight would erase a chip in weeks, and indoor fluorescent lighting over several years."

[dshepp806]

@chrisbruck: You are in for one helluva' treat with Steve's programming.

I would suggest that you are certain that you've a good idle control path (all components),..no vaccuum leaks, ICV is good-2-go,..mix is good,..ALL before you install Steve's chip. You may have to tweak the idle a bit,....but (still) be prepared for a response you've not felt before........promise.

BEST!

Doyle

[spuggy]

Originally Posted by Dave Colangelo

Even though the chip was in a metal box this picture was taken out of the box which means the chip was/is exposed to ambient UV light. All it takes is a single word in memory being erased to cause an issue.

Regards
Dave

Errr.

The erasure characteristics of the NTE2732A are such that erasure begins when the cells are exposed to light with wavelengths shorter than approximately 4000 Angstroms (A). It should be noted that sunlight and certain types of fluorescent lamps have wavelengths in the 3000–4000 A range. Data shows that constant exposure to room level fluorescent lighting could erase a typical NTE2732A in approximately 3 years, while it would take approximately 1 week to cause erasure when exposed to the direct sunlight. If the NTE2732A is to be exposed to these types of lighting conditions for extended periods of time, it is suggested that opaque labels be put over the NTE2732A window to prevent unintentional erasure.

The recommended erasure procedure for the NTE2732A is exposure to shortwave ultraviolet light which has a wavelength of 2537 Angstroms (A). The integrated dose (i.e. UV intensity x exposure time) for erasure time with this dosage is approximately 15 to 20 minutes using an ultraviolet lamp with 12000 μW/cm2 power rating. The NTE2732A should be placed within 2.5cm of the lamp tubes during erasure. Some lamps have a filter on their tubes which should be removed before erasure.

[chrisbruck]

I guess I'll find out tomorrow morning if it starts or not... took 5-6 pics with the flash to post the pic of the chip. Knowing me the camera flash probably messed it up.

[ToddM]

The chip is fine.. you guys make me laugh

[Dave Colangelo]

My knowledge comes from warnings that my various EE professors have given me over the years. I do understand that it would take a very long time to wipe this chip given exposure to indoor light, it is still some thing I would not want to chance. The same way that I am sure many of us would not wear a grounding strap when taking our ECU's apart, granted the chance of static shock is small I still always wear one.

Regards
Dave

[chrisbruck]

FYI, Ran perfect this AM even with all the flash shots....