OEM EPROM and GM Parts EPROM
08-03-2001, 07:47 PM
#1
Member
Thread Starter
Join Date: Jul 2001
Location: Western NY area, USA
Posts: 198
Likes: 0
Received 0 Likes
on
0 Posts
OEM EPROM and GM Parts EPROM
I wanted a spare EPROM for my '86 Y-body, so I ordered one from Jeff Kopp (Superior Chevy). My '86 EPROM is a AMJ 0499 (BCC), so I looked at the 18 EPROM ("Calibrator") entries in my '91 parts book, and found the GM part #, which is 1228473.
The new Memcal comes in, p/n 1228473, but has a AARL 0122 chip in it. No problemo, I think - so I open it up in UltraEdit (hex) and the BIN is different...
Looking at it in TunerCat, it's pretty much the same. I'm going to try it this weekend, but can anyone tell me why the code wouldn't be *exactly* the same???
Maybe GM consolidated some chips???
The new Memcal comes in, p/n 1228473, but has a AARL 0122 chip in it. No problemo, I think - so I open it up in UltraEdit (hex) and the BIN is different...
Looking at it in TunerCat, it's pretty much the same. I'm going to try it this weekend, but can anyone tell me why the code wouldn't be *exactly* the same???
Maybe GM consolidated some chips???
08-04-2001, 07:42 AM
#2
Supreme Member
Join Date: Jun 2000
Location: In reality
Posts: 7,554
Likes: 0
Received 1 Like
on
1 Post
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
<font face="Verdana, Arial" size="2">Originally posted by Sarkee:
I wanted a spare EPROM for my '86 Y-body, so I ordered one from Jeff Kopp (Superior Chevy). My '86 EPROM is a AMJ 0499 (BCC), so I looked at the 18 EPROM ("Calibrator") entries in my '91 parts book, and found the GM part #, which is 1228473.
The new Memcal comes in, p/n 1228473, but has a AARL 0122 chip in it. No problemo, I think - so I open it up in UltraEdit (hex) and the BIN is different...
Looking at it in TunerCat, it's pretty much the same. I'm going to try it this weekend, but can anyone tell me why the code wouldn't be *exactly* the same???
Maybe GM consolidated some chips???</font>
I wanted a spare EPROM for my '86 Y-body, so I ordered one from Jeff Kopp (Superior Chevy). My '86 EPROM is a AMJ 0499 (BCC), so I looked at the 18 EPROM ("Calibrator") entries in my '91 parts book, and found the GM part #, which is 1228473.
The new Memcal comes in, p/n 1228473, but has a AARL 0122 chip in it. No problemo, I think - so I open it up in UltraEdit (hex) and the BIN is different...
Looking at it in TunerCat, it's pretty much the same. I'm going to try it this weekend, but can anyone tell me why the code wouldn't be *exactly* the same???
Maybe GM consolidated some chips???</font>
Yes the differences can be real dramatic
08-04-2001, 08:52 PM
#3
Member
Thread Starter
Join Date: Jul 2001
Location: Western NY area, USA
Posts: 198
Likes: 0
Received 0 Likes
on
0 Posts
<font face="Verdana, Arial" size="2">Originally posted by Grumpy:
GM is constantly refining the memcals, so there are often updates.
Yes the differences can be real dramatic
</font>
GM is constantly refining the memcals, so there are often updates.
Yes the differences can be real dramatic
</font>
The biggest change I can see is in the "Minimum Delta TPS for Accel. Enrich"...It dropped from 12.5% to 3.9%...
I don't know this...Is it Throttle Position Switch? Making the % of throttle movement less to signal the ECU to enrich the mixture??? Wouldn't that be a faster response???
08-04-2001, 09:45 PM
#4
Supreme Member
Join Date: Jun 2000
Location: In reality
Posts: 7,554
Likes: 0
Received 1 Like
on
1 Post
Car: An Ol Buick
Engine: Vsick
Transmission: Janis Tranny Yank Converter
<font face="Verdana, Arial" size="2">Originally posted by Sarkee:
They made the fan on-off/ac on-off temps the same...Lots of little changes in the tables...
The biggest change I can see is in the "Minimum Delta TPS for Accel. Enrich"...It dropped from 12.5% to 3.9%...
I don't know this...Is it Throttle Position Switch? Making the % of throttle movement less to signal the ECU to enrich the mixture??? Wouldn't that be a faster response???</font>
They made the fan on-off/ac on-off temps the same...Lots of little changes in the tables...
The biggest change I can see is in the "Minimum Delta TPS for Accel. Enrich"...It dropped from 12.5% to 3.9%...
I don't know this...Is it Throttle Position Switch? Making the % of throttle movement less to signal the ECU to enrich the mixture??? Wouldn't that be a faster response???</font>
Yes, faster acting acclerator *pump shot*
Thread
Thread Starter
Forum
Replies
Last Post
1992 Trans Am
Exterior Parts for Sale
5
04-04-2016 12:50 PM
LT1Formula
Engine/Drivetrain/Suspension Parts for Sale
20
11-14-2015 12:02 AM
