EPROMS Deteriorate? - ZR-1 Net Registry Forums

tf95ZR1 · 01-26-2022

On the Corvette Central website I saw an ad for C4 EPROMS/MEMCALS.
I took a look. They said:

"* Originally not designed to last over 5 years, as a result Corvettes equiped (sp) with eproms
need to be replaced or flashed every 5 years to maintain peek (sp) performance.
* Eproms are newly reflashed OEM parts. The software contains the latest upgrades
that are available including running changes.
Most GM ECMs used until 1995 have an Erasable Programmable Read Only Memory (EPROM)
that stores data about the C4 Corvette engine it controls and does not lose its content when
the power supply is cut off. EPROMs also contain information specific to the transmission
and the car. The EPROM is often referred to as the "chip". The chip is sometimes located in
a removable carrier called a MemCal or Calpack. These are rebuilt factory prom chips that
include the memcal. Programmed with the most up to date program that was released from GM.
An $80.00 core charge is added and will be refunded when the original prom/memcal is returned."

I have never heard of replacing EPROMs every 5 years. What say you?

01-26-2022	#1
tf95ZR1 Join Date: Aug 2005 Location: Northridge, CA Posts: 1,457	EPROMS Deteriorate? On the Corvette Central website I saw an ad for C4 EPROMS/MEMCALS. I took a look. They said: "* Originally not designed to last over 5 years, as a result Corvettes equiped (sp) with eproms need to be replaced or flashed every 5 years to maintain peek (sp) performance. * Eproms are newly reflashed OEM parts. The software contains the latest upgrades that are available including running changes. Most GM ECMs used until 1995 have an Erasable Programmable Read Only Memory (EPROM) that stores data about the C4 Corvette engine it controls and does not lose its content when the power supply is cut off. EPROMs also contain information specific to the transmission and the car. The EPROM is often referred to as the "chip". The chip is sometimes located in a removable carrier called a MemCal or Calpack. These are rebuilt factory prom chips that include the memcal. Programmed with the most up to date program that was released from GM. An $80.00 core charge is added and will be refunded when the original prom/memcal is returned." I have never heard of replacing EPROMs every 5 years. What say you? __________________ 1995 ZR-1 #106 Blk/ Blk Owned by me since 2000. 93K miles, but not on motor :-) Mods the way I want it, Not afraid to drive it! Last edited by GOLDCYLON; 02-01-2022 at 12:11 AM.