265 Hemi to efi
- vlad01
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Re: 265 Hemi to efi
8 bits in a byte. Chips (hardware) are always denoted in bits while files (software) are generally always in bytes. 512Kb (little b is bits) is equal to 64KB (big B is bytes)
12P is 32KB non stacked.
11P is 64KB non stacked.
If you are using 12P you either stack it twice to make 32KB+32KB making it fit 512Kb prom perfect or you run an offset of 8000 on the burner, that puts the 32Kb file at the bottom of the memory array.
The reason it needs to be at the bottom is becasue the ECU starting reading the data from bottom up, the start of the file is the essentially at the end of the proms address range. ie. FFFF
That is why we need to do this to make it work.
12P is 32KB non stacked.
11P is 64KB non stacked.
If you are using 12P you either stack it twice to make 32KB+32KB making it fit 512Kb prom perfect or you run an offset of 8000 on the burner, that puts the 32Kb file at the bottom of the memory array.
The reason it needs to be at the bottom is becasue the ECU starting reading the data from bottom up, the start of the file is the essentially at the end of the proms address range. ie. FFFF
That is why we need to do this to make it work.
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.
Re: 265 Hemi to efi
Just to add my two cents on software I'm not familiar with, but wouldn't the file offset be 0 and you'd use the device offset? You want the entire file from the beginning, but program it into the last part of the prom.heff0018 wrote:Thanks for the reply I only entered the file offset this time. Strange I still get an error but now the address is 0x008001.
Re: 265 Hemi to efi
Thanks for the explanation.vlad01 wrote:8 bits in a byte. Chips (hardware) are always denoted in bits while files (software) are generally always in bytes. 512Kb (little b is bits) is equal to 64KB (big B is bytes)
12P is 32KB non stacked.
11P is 64KB non stacked.
If you are using 12P you either stack it twice to make 32KB+32KB making it fit 512Kb prom perfect or you run an offset of 8000 on the burner, that puts the 32Kb file at the bottom of the memory array.
The reason it needs to be at the bottom is becasue the ECU starting reading the data from bottom up, the start of the file is the essentially at the end of the proms address range. ie. FFFF
That is why we need to do this to make it work.
- vlad01
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Re: 265 Hemi to efi
I went through the same thing when I first started before I really understood how it all worked.
The least I can do is share that in a way that hopefully makes sense.
The other thing I learned that no one mentioned is soldering the EEPROMs directly at least with the genuine SST proms is a bad idea, they are sensitive to the heat and their addressing during burning goes haywire and they die. I had 4/5 die lol, so I now solder a socket first and that allows heat free install of the proms and I haven't had an issue since.
The least I can do is share that in a way that hopefully makes sense.
The other thing I learned that no one mentioned is soldering the EEPROMs directly at least with the genuine SST proms is a bad idea, they are sensitive to the heat and their addressing during burning goes haywire and they die. I had 4/5 die lol, so I now solder a socket first and that allows heat free install of the proms and I haven't had an issue since.
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.
Re: 265 Hemi to efi
Cheers, ithe eprom was such a tight fit that I guessed it wouldn’t need soldering. Got that part right.vlad01 wrote:I went through the same thing when I first started before I really understood how it all worked.
The least I can do is share that in a way that hopefully makes sense.
The other thing I learned that no one mentioned is soldering the EEPROMs directly at least with the genuine SST proms is a bad idea, they are sensitive to the heat and their addressing during burning goes haywire and they die. I had 4/5 die lol, so I now solder a socket first and that allows heat free install of the proms and I haven't had an issue since.
- vlad01
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Re: 265 Hemi to efi
They were soldered from the factory but its a reflow process so the heat is minimal and UV EPROMs are much more hardy. I've never killed one of them.
relying only on the contacts in the memcal might cause issues running as vibration could cause reading issues during operation and throw up errors. The memcal socket isn't a true socket, its meant to be soldered. That is why I solder in a real machined socket and then install the EEPROM into that.
relying only on the contacts in the memcal might cause issues running as vibration could cause reading issues during operation and throw up errors. The memcal socket isn't a true socket, its meant to be soldered. That is why I solder in a real machined socket and then install the EEPROM into that.
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.
Re: 265 Hemi to efi
Yep, I soldered in the socket. Cheers
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Re: 265 Hemi to efi
if nothing else its a good idea to socket them so you can put whatever you want in it, if the eeprom fails easy to replace, or if you wanted to burn a finished tune to an eprom then you can and send it on its way.
i've also had some issues with header boards and dodgy connections, having a socket makes it all too easy to pop it out for a read.
i've also had some issues with header boards and dodgy connections, having a socket makes it all too easy to pop it out for a read.
No matter what the question is, the answer is always more horsepower!
Just starting out? Have a read of the getting started guide
Basic tuning of a delco ECM with $12P thread
Advanced tuning of a delco ECM with $12P thread
Just starting out? Have a read of the getting started guide
Basic tuning of a delco ECM with $12P thread
Advanced tuning of a delco ECM with $12P thread
- vlad01
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Re: 265 Hemi to efi
Agree for all the same reasons.
I'm the director of VSH (Vlad's Spec Holden), because HSV were doing it ass about.
Re: 265 Hemi to efi
The Ute is in at the dyno, not quite finished yet but as of this afternoon with 10 degrees of timing, 15 PSI of boost at 5000 rpm 280 hp at rear wheels. With a bit more timing it should hit 300.
The MSD crapped itself just as it got on the dyno on Monday so it was replaced with a FAst Hi 6 box.
I am am happy that the cast pistons haven’t given up yet!
The MSD crapped itself just as it got on the dyno on Monday so it was replaced with a FAst Hi 6 box.
I am am happy that the cast pistons haven’t given up yet!