Spark Bias (new ECU now there is warm and cold)
#1
Supreme Member
Thread Starter
Join Date: Feb 2000
Location: Seattle, Washington
Posts: 1,170
Likes: 0
Received 0 Likes
on
0 Posts
Car: '87 IROC-Z/'82 RX7
Engine: SBC 355/1.1L Rotary
Transmission: T56/5 Speed
Axle/Gears: 4.33/3.93
Spark Bias (new ECU now there is warm and cold)
Bias Q:
I notice that the cold bias is 20, and the warm bias is 9.84.
In my previous ECUs, there was just one bias. 9.84
The coolant compensation has alot of 20's in it, where it would normally be 0. So that's where the cold bias works in.
The warm bias is 9.84... does that mean that I'm getting another 11 degrees at all times when the engine's warm?!~ That might explain my lean pop! lol
Thanks
-Paul
I notice that the cold bias is 20, and the warm bias is 9.84.
In my previous ECUs, there was just one bias. 9.84
The coolant compensation has alot of 20's in it, where it would normally be 0. So that's where the cold bias works in.
The warm bias is 9.84... does that mean that I'm getting another 11 degrees at all times when the engine's warm?!~ That might explain my lean pop! lol
Thanks
-Paul
#2
Senior Member
Join Date: Oct 1999
Posts: 6,621
Likes: 0
Received 1 Like
on
1 Post
Car: 91 Red Sled
Axle/Gears: 10bolt Richmond 3.73 Torsen
Re: Spark Bias (new ECU now there is warm and cold)
Originally posted by Twilightoptics
Bias Q:
I notice that the cold bias is 20, and the warm bias is 9.84.
In my previous ECUs, there was just one bias. 9.84
The coolant compensation has alot of 20's in it, where it would normally be 0. So that's where the cold bias works in.
The warm bias is 9.84... does that mean that I'm getting another 11 degrees at all times when the engine's warm?!~ That might explain my lean pop! lol
Thanks
-Paul
Bias Q:
I notice that the cold bias is 20, and the warm bias is 9.84.
In my previous ECUs, there was just one bias. 9.84
The coolant compensation has alot of 20's in it, where it would normally be 0. So that's where the cold bias works in.
The warm bias is 9.84... does that mean that I'm getting another 11 degrees at all times when the engine's warm?!~ That might explain my lean pop! lol
Thanks
-Paul
#3
Supreme Member
Thread Starter
Join Date: Feb 2000
Location: Seattle, Washington
Posts: 1,170
Likes: 0
Received 0 Likes
on
0 Posts
Car: '87 IROC-Z/'82 RX7
Engine: SBC 355/1.1L Rotary
Transmission: T56/5 Speed
Axle/Gears: 4.33/3.93
I have a 7747-mine.xdf and ecu.
The xdf has less tuff.
I just import the ECU in. It has the bias not taken out of the main table.
In the 42.xdf file I have, if I set the main bias to 0, it would add the original 9 to the main table. With the bias set at nine, it would subtract from the main table.
It's confusing as to why there are two. With the $6e I used to tune the bias was 20 all around.
So what you're saying is the "warm" bias set at 9.84.... is the bias for the main table.....
And the "cool" bias, is just for the coolant compensation table?
Bummer, I was hoping I was getting mass amounts of spark and it'd be an easy AE fix. LOL
The xdf has less tuff.
I just import the ECU in. It has the bias not taken out of the main table.
In the 42.xdf file I have, if I set the main bias to 0, it would add the original 9 to the main table. With the bias set at nine, it would subtract from the main table.
It's confusing as to why there are two. With the $6e I used to tune the bias was 20 all around.
So what you're saying is the "warm" bias set at 9.84.... is the bias for the main table.....
And the "cool" bias, is just for the coolant compensation table?
Bummer, I was hoping I was getting mass amounts of spark and it'd be an easy AE fix. LOL
#4
Senior Member
Join Date: Oct 1999
Posts: 6,621
Likes: 0
Received 1 Like
on
1 Post
Car: 91 Red Sled
Axle/Gears: 10bolt Richmond 3.73 Torsen
Originally posted by Twilightoptics
I have a 7747-mine.xdf and ecu.
The xdf has less tuff.
I just import the ECU in. It has the bias not taken out of the main table.
In the 42.xdf file I have, if I set the main bias to 0, it would add the original 9 to the main table. With the bias set at nine, it would subtract from the main table.
It's confusing as to why there are two. With the $6e I used to tune the bias was 20 all around.
So what you're saying is the "warm" bias set at 9.84.... is the bias for the main table.....
And the "cool" bias, is just for the coolant compensation table?
Bummer, I was hoping I was getting mass amounts of spark and it'd be an easy AE fix. LOL
I have a 7747-mine.xdf and ecu.
The xdf has less tuff.
I just import the ECU in. It has the bias not taken out of the main table.
In the 42.xdf file I have, if I set the main bias to 0, it would add the original 9 to the main table. With the bias set at nine, it would subtract from the main table.
It's confusing as to why there are two. With the $6e I used to tune the bias was 20 all around.
So what you're saying is the "warm" bias set at 9.84.... is the bias for the main table.....
And the "cool" bias, is just for the coolant compensation table?
Bummer, I was hoping I was getting mass amounts of spark and it'd be an easy AE fix. LOL
#5
Supreme Member
iTrader: (1)
Join Date: Jun 2001
Location: 600 yds out
Posts: 1,520
Likes: 0
Received 0 Likes
on
0 Posts
Car: Bee-Bowdy
Engine: blowd tree-fity
Transmission: sebin hunnerd
Axle/Gears: fo-tins
Originally posted by Twilightoptics
It's confusing as to why there are two. With the $6e I used to tune the bias was 20 all around.
So what you're saying is the "warm" bias set at 9.84.... is the bias for the main table.....
And the "cool" bias, is just for the coolant compensation table?
It's confusing as to why there are two. With the $6e I used to tune the bias was 20 all around.
So what you're saying is the "warm" bias set at 9.84.... is the bias for the main table.....
And the "cool" bias, is just for the coolant compensation table?
Let's say they wanted -1° of advance. With a 9° bias they would put 8° in that cell. 8° - 9° = -1°. I'm not a programmer, but I think it takes up more space in the cal to have a negative number.
That ECM was generally used in trucks so there are alot of places in the SA table where they wanted negative SA for towing and lo-po engines.
#6
Supreme Member
Thread Starter
Join Date: Feb 2000
Location: Seattle, Washington
Posts: 1,170
Likes: 0
Received 0 Likes
on
0 Posts
Car: '87 IROC-Z/'82 RX7
Engine: SBC 355/1.1L Rotary
Transmission: T56/5 Speed
Axle/Gears: 4.33/3.93
I don understand the idea and concept behind the bias, what was confusing was having a "warm" bias and a "cold" bias with just one compensation table.
#7
Junior Member
Join Date: Oct 2002
Location: Houston, TX
Posts: 82
Likes: 0
Received 0 Likes
on
0 Posts
Car: 89 S10 Blazer
Engine: Built 4.3L V6 TBI
Transmission: Built 700R4
Axle/Gears: 7.65/Zexel/3.73
It's not that having negative numbers takes up more space, they cut the granulatiry of the table in half. An 8-bit number can represent 0 - 255 when unsigned, but only -128 - 127 when signed. So instead they use all 8 bits across the table for the value, and one extra byte to house the bias.
Teeleton
Teeleton
Thread
Thread Starter
Forum
Replies
Last Post
MikkoV
TPI
2
09-09-2015 04:25 PM