Are there any other flash chip #s that can be substituted for the 27SF512? I was going to buy a ZIF socket from Mouser and figured I'd get a couple chips too but they don't list the 27SF512.
Printable View
Are there any other flash chip #s that can be substituted for the 27SF512? I was going to buy a ZIF socket from Mouser and figured I'd get a couple chips too but they don't list the 27SF512.
Tons and tons and tons and tons and tons. Your ECM doesn't actually use that chip anyway; it probably uses a 27C256 (or smaller!), which is an insanely common chip.
Like, if you're actually looking for a flash-rewritable chips, then something like the W27E257 would work. But honestly I don't bother with EEPROMs for these old applications. The chips are cheap and not hard to come by, just grab a handful of 27C256s and be on your merry. :thumbsup:
My 7747 uses 2732 PROMs but I'm thinking of dropping the dime on a 7427. That W27E257 isn't coming up either.
Eventually I'm going to invest in an EBL but probably not until I drop in the 355.
What about these?
https://www.jameco.com/z/AT28C64A-15...MOS_74827.html
If the picture is correct, the pin width spacing is wrong^^^.
I have no beefs with the '7747 except the slow baud rate it spits out the data. With a '7427, you'll get more data points faster and can hammer out a tune quicker. Should you stick with a '7747, you should consider this modification that allows you to use a 28 pin EEPROM vs the 24 pin 2732A.
http://www.gearhead-efi.com/Fuel-Injection/showthread.php?172-7747-Flash-Chip-Conversion-(27SF512)
I suppose if you used this zif socket, it will accommodate either pin spacing but make sure the zif socket has the correct spacing that gets soldered into the ECMs board. https://www.newark.com/productimages...B/42260842.jpg
Thanks stew,
I'm not going to try and do much with the 7747. The 7427 is on it's way. That will be another Q&A thread.
Where did you find that quick release socket? I like that! If the pins line up I would have to make a spacer for the cover but I'm OK with that.
TBH I don't like them for the reason they don't fit under the cover.
https://www.jameco.com/z/28-6554-10-...le_104003.html
If you're dead set on using the '7427, advise that you get a EEPROM with 512k capacity as that's what the '7427 uses. With the zif mod linked^^^you'll still be able to use the 512k EEPROM with the '7747. No sense in buying something that only supports one ECM.
Shifting gears to '7427, you're gonna want a spare memcal that can be modified to accept a zif or take a chance screwing up your original or use a memcal adapter.
I went with this one for the lower profile;
https://www.amazon.com/Aries-28-526-...3716047&sr=8-5
Just ordered three 27sf512 proms.
With all these acquisitions, I’m excited for you but which burner are you considering unless you already own one. Hate to see you think that you’re making great progress only to realize you’re still missing a piece of the puzzle. :thumbsup:
This one;
https://www.ebay.com/itm/385913991757?var=653585960648
NomakeWan claims they work good. Had a hell of a time downloading the driver but I got it done in the end.
The previous iteration of that same device has indeed been a workhorse in my lab over the years. Used it to program chips for 85 Corvettes, my 90 Corvette, and a buddy's R32 GT-R. Also used it to flash various Atmel microcontrollers. It just lives in my lab hooked to an old XP laptop from 2009 to churn out chips. :thumbsup:
I'm close to doing the 7427 swap and came up with a brainstorm. My idea is to run a ribbon cable out of the PCM and install a 28 position Aries ZIF socket to the inside of the glove box. That way I don't have to keep pulling the PCM out every time I burn a new chip. If successful I'll post pics.
That's very similar to how devices like the Moates Ostrich work, so yeah, that works too! Best of luck!
Whatever happened to Craig Moates?
Left the market to focus on family. A company called BoostedNW is now selling stuff like what they used to sell, including a replacement for the Ostrich. They're where I got the MEMCAL adapter for my '90.
Does a datalog device exist that converts an ALDL plug to thumb drive? Driving around with a cord stretched across to a laptop in the passenger seat is kind of a PITA.
It exists as a DIY device: http://www.pfautsch.com/?page_id=1486
Years ago in dealer land you would grab the GM supplied tape recorder and special cable and drive around recording ALDL data. It would seem like a modern version which can write to a thumb drive is possible.
Sometimes it's tough to identify a particular incident with this type of recording. Lets say your vehicle was behaving well, except for that one time you accelerated to get out into traffic quickly. If you're not able to note the time or some other identifying feature, how do you know where to go to in the recorded data to see what happened? I would think combining ALDL adapter and Bluetooth would be the way to go. The laptop can be configured to display a "histograph" of data assisting with visual recognition of an incident when it happens, and it records timestamps to help reference events.
https://www.ebay.com/itm/114869457343
Anybody know of a circuit board that accepts the .6 X .1 28 pin DIP pattern and the .1 X .1 IDC header socket? I want to solder the ZIF socket to the front side and solder a IDC shrouded male pin socket on the back side to plug the ribbon cable into. All I've fond so far are those project boards with lots of holes in them that I would have to tie together with lines of solder or small wire.
We can make one, So you mean the same thing as the moates chip extender?
http://www.gearhead-efi.com/Fuel-Inj...AASUVORK5CYII=
You can't always just slap a chip on a board 18+ inches away and have it work.. There was more to the chip extenders than just the circuit board, socket and IDC
or like this..
https://i.imgur.com/yYiOzko.png
https://i.imgur.com/svNuVbd.png
obviously then replacing that chip socket with a zif, i just didnt have zif socket 3d model to put in there
Also we have tons of Genuine SST 27SF512 in stock
As well as replacement genuine SST adapted from PLCC chip footprint to DIP 28 to be usable as a regular 28 pin chip
Then throw it in a nice little 3d printed enclosure, and you can have yourself a remote chip
https://i.imgur.com/3yMMnpV.png
This is an initial example, but without signal amplification going on, noise will be an issue. Even the Ostrich cable on some ECM's is too far of a stretch and causes issues. We will be creating a final design with signal amplification.
That's a pretty cool setup.
I wanted the box header coming straight out the back because the ribbon connector forms a right angle. The idea is to cut an opening in the glovebox liner just large enough for the header to poke through. Install the ZIF with a couple small screws coming in from the back side,plug the cable in and push the liner back in place.
Are you doing 3D printing?
Cool! As soon as a get these pieces assembled I'll get some measurements and a design to make a rectangular cup with a slot in the back for the box header to poke through.
That circuit board that you pictured with the right angle header could have a straight header soldered where it is poking out the back right? Are those boards something you carry in stock? Just thinking of other maybe better ways of mounting the device.
Yes the header can be changed to whatever type that pokes out straight, right angle, it can be moved, etc
the board's aren't made yet, its just an altered design we have from our Socket Booster which is essentially the same but instead of pins and socket on one board, would just bet the socket, then extended with a cable. But like I previously stated you can't always just run pin to pin and extend it 18+ inches from chip to ECM. The 24 pin ecms in particular did not do well with extending the chip OR emulation over the Ostrich cable due to the logic levels and signal degradation over the length of the cable. Now like Fast355 mentioned...
there are some that are fine, and others that will not work without having the signals amplified basically
Maybe it’s fortunate that I’m using the 7427. I didn’t buy the cable connectors with the gold plated terminals but that may have to be an option for better conductivity.
if all else fails, you can just add this on to boost it
https://boostednw.com/bnw-socket-booster
I plan on finishing the chip extender board, and adding these components to that as well so the signal boosting will be built in and just work in any ECM
Well,that was a bust. It has the correct .1 two row spacing down the middle but the outer rows are only .5 I guess my only other option is perf board and tie the holes with solder. One way or another this IS going to happen!!! I have another one that has the correct .6 along the outer row but .3 on the inner row. I could solder the ribbon leads to the inner row but that will make installation a PITA. I want to install the ECM then leave just enough lead to plug it into the ZIF and slide the liner back in place. Who even makes a .5 DIP?