timing for 3.4 camaro [total advance]
#3
03-05-2012, 03:41 PM
Join Date: Oct 2007
Location: The 'Burbs of Chicago
Posts: 18,306
Since this engine was computerized and timing wasn't "set", you're gonna have to fly by the seat of your pants. I'd start with the good old Chevy standby of 10 degrees BTDC base and and see what that gives you, using your ears as a reliable ping-o-meter. For reference, a small block Chevy likes total timing in the 34-36 range. Can't say exactly how your 3.4 is going to respond to either, you'll need to experiment.
#4
03-05-2012, 05:23 PM
Join Date: Oct 2007
Location: The 'Burbs of Chicago
Posts: 18,306
Oh yeah, and about the #1 cylinder: 1995 Chevrolet Firing Orders
(merged and moved your two threads to 4th gen V6 tech)
(merged and moved your two threads to 4th gen V6 tech)
Last edited by Camaro 69; 03-05-2012 at 05:35 PM.
#5
03-05-2012, 06:45 PM
I think you would be fine using 32 Deg of total timing. But that is the max at 5500 RPMs. What ditributor are you using? Do you have a vacuum advance? Or weights? Your really going to need to dial that advance back if you want the car to run decents at low RPMs. If you using an old 2.8 distributer from a S10 I would start off setup just like it was still on the 2.8 and start advancing from there.
#6
11-05-2013, 03:24 AM
Not to revive an old thread, BUT.....
It's pretty pertinent to what I am working on right now, and being that I have been stumped on this issue for a couple of weeks now, I'm skipping the basic intro and getting right into it in hopes of finding an answer.
To the point:
I've got an '85 s15 that I've replaced the 2.8 with a 93 3.4L.
It was carbureted but is now TBI and obviously using an ECM.
For the past 7 months, I've been running this ecm, but have had a basic tune and have just recently gotten into fine tuning for better performance and mileage.
It's all pretty much stock, other than being a 3.4 block with a 2.8 tbi system with compensation made into the prom for the injectors and fuel table.
Unfortunately, this thread is the first I've found in all my searching so far for info regarding the timing curve of the 3.4 block.
Generally speaking, from everything I have read about "all in", gm engines like 32-38 degrees. Some more, some less.
As it stands right now, my focus is in the cruise range of 55-75 mph with rpm range of 1800-2500.
As I understand it, the goal is to be about 32 degrees in the area of 2000-2500.
Based on the timing table in one bin file of the ecm running the camaro/firebird v6, (16212614), the timing for the area of discussion ranges from 32 - 40 degrees. (This would make sense since there isn't an "initial timing" adjustment and the base would simply be 0).
Problem is that I am running a table that has an "initial timing" set to 0 degrees and 20-26 degrees of advance in the same areas previously mentioned.
It seems though, that advancing the spark in the current table results in knock counts going through the roof.
So I am a little confused as to why it's occurring. The only thing I can think of is that there are parameters that I have not taken into consideration with the current ECM that I am using.
Any help would be greatly appreciated.
To the point:
I've got an '85 s15 that I've replaced the 2.8 with a 93 3.4L.
It was carbureted but is now TBI and obviously using an ECM.
For the past 7 months, I've been running this ecm, but have had a basic tune and have just recently gotten into fine tuning for better performance and mileage.
It's all pretty much stock, other than being a 3.4 block with a 2.8 tbi system with compensation made into the prom for the injectors and fuel table.
Unfortunately, this thread is the first I've found in all my searching so far for info regarding the timing curve of the 3.4 block.
Generally speaking, from everything I have read about "all in", gm engines like 32-38 degrees. Some more, some less.
As it stands right now, my focus is in the cruise range of 55-75 mph with rpm range of 1800-2500.
As I understand it, the goal is to be about 32 degrees in the area of 2000-2500.
Based on the timing table in one bin file of the ecm running the camaro/firebird v6, (16212614), the timing for the area of discussion ranges from 32 - 40 degrees. (This would make sense since there isn't an "initial timing" adjustment and the base would simply be 0).
Problem is that I am running a table that has an "initial timing" set to 0 degrees and 20-26 degrees of advance in the same areas previously mentioned.
It seems though, that advancing the spark in the current table results in knock counts going through the roof.
So I am a little confused as to why it's occurring. The only thing I can think of is that there are parameters that I have not taken into consideration with the current ECM that I am using.
Any help would be greatly appreciated.
#8
12-10-2013, 12:51 AM
It's pretty pertinent to what I am working on right now, and being that I have been stumped on this issue for a couple of weeks now, I'm skipping the basic intro and getting right into it in hopes of finding an answer.
To the point:
I've got an '85 s15 that I've replaced the 2.8 with a 93 3.4L.
It was carbureted but is now TBI and obviously using an ECM.
For the past 7 months, I've been running this ecm, but have had a basic tune and have just recently gotten into fine tuning for better performance and mileage.
It's all pretty much stock, other than being a 3.4 block with a 2.8 tbi system with compensation made into the prom for the injectors and fuel table.
Unfortunately, this thread is the first I've found in all my searching so far for info regarding the timing curve of the 3.4 block.
Generally speaking, from everything I have read about "all in", gm engines like 32-38 degrees. Some more, some less.
As it stands right now, my focus is in the cruise range of 55-75 mph with rpm range of 1800-2500.
As I understand it, the goal is to be about 32 degrees in the area of 2000-2500.
Based on the timing table in one bin file of the ecm running the camaro/firebird v6, (16212614), the timing for the area of discussion ranges from 32 - 40 degrees. (This would make sense since there isn't an "initial timing" adjustment and the base would simply be 0).
Problem is that I am running a table that has an "initial timing" set to 0 degrees and 20-26 degrees of advance in the same areas previously mentioned.
It seems though, that advancing the spark in the current table results in knock counts going through the roof.
So I am a little confused as to why it's occurring. The only thing I can think of is that there are parameters that I have not taken into consideration with the current ECM that I am using.
Any help would be greatly appreciated.
To the point:
I've got an '85 s15 that I've replaced the 2.8 with a 93 3.4L.
It was carbureted but is now TBI and obviously using an ECM.
For the past 7 months, I've been running this ecm, but have had a basic tune and have just recently gotten into fine tuning for better performance and mileage.
It's all pretty much stock, other than being a 3.4 block with a 2.8 tbi system with compensation made into the prom for the injectors and fuel table.
Unfortunately, this thread is the first I've found in all my searching so far for info regarding the timing curve of the 3.4 block.
Generally speaking, from everything I have read about "all in", gm engines like 32-38 degrees. Some more, some less.
As it stands right now, my focus is in the cruise range of 55-75 mph with rpm range of 1800-2500.
As I understand it, the goal is to be about 32 degrees in the area of 2000-2500.
Based on the timing table in one bin file of the ecm running the camaro/firebird v6, (16212614), the timing for the area of discussion ranges from 32 - 40 degrees. (This would make sense since there isn't an "initial timing" adjustment and the base would simply be 0).
Problem is that I am running a table that has an "initial timing" set to 0 degrees and 20-26 degrees of advance in the same areas previously mentioned.
It seems though, that advancing the spark in the current table results in knock counts going through the roof.
So I am a little confused as to why it's occurring. The only thing I can think of is that there are parameters that I have not taken into consideration with the current ECM that I am using.
Any help would be greatly appreciated.
The timing map for the 93 engine is going to be for a DIS system not a distributor. The timing map in the ECM uses many inputs from the engine's sensors to determine when to advance the timing and by how much. The DIS system is a little different. You are going to need to use a timing map for a distributor based engine that uses the ICM that controls the timing. A 2.8L should have a map that is close enough to the needs of the 3.4L.
Massey
#9
12-13-2013, 10:33 AM
Here is a SA table (map) for a 3.1 with a distributor that I have in my BIN collection..
Use at your own risk.
20 30 40 50 60 70 75 80 85 90 95 100
400 28.13 23.91 23.91 23.91 23.91 27.07 22.15 17.93 16.17 16.17 11.95 11.95
600 28.13 23.91 23.91 23.91 23.91 27.07 22.15 17.93 16.17 16.17 11.95 11.95
800 28.13 28.83 28.83 28.83 28.83 27.07 22.15 22.15 20.04 17.93 15.12 15.12
1000 28.83 30.94 35.16 34.1 34.1 27.07 22.15 22.15 20.04 17.93 15.12 15.12
1200 28.83 34.1 40.08 40.08 39.02 27.07 22.15 22.15 20.04 17.93 15.12 15.12
1400 29.88 35.16 41.13 39.02 34.1 28.13 23.91 22.15 22.15 20.04 16.88 16.88
1600 29.88 35.16 41.84 37.97 30.94 29.88 26.02 22.85 22.15 20.04 16.88 16.88
1800 30.94 35.16 42.89 35.86 30.94 29.88 26.02 22.85 22.15 21.09 20.04 20.04
2000 30.94 35.16 42.89 35.16 30.94 30.94 27.07 22.85 22.15 21.09 20.04 20.04
2200 30.94 35.16 42.89 36.91 33.05 30.94 26.02 22.85 22.15 21.09 20.04 20.04
2400 30.94 35.16 42.89 39.02 35.86 31.99 26.02 22.85 22.15 21.09 20.04 20.04
2800 30.94 34.1 41.84 37.97 35.16 31.99 24.96 22.85 22.15 21.09 20.04 20.04
3200 30.94 34.1 41.13 36.91 33.05 28.83 23.91 22.85 22.15 21.09 20.04 20.04
3600 30.94 33.05 40.08 35.86 29.88 26.02 23.91 22.85 22.15 22.15 21.09 21.09
4000 30.94 33.05 39.02 35.16 28.83 24.96 23.91 23.91 22.85 22.85 22.15 22.15
4400 30.94 31.99 37.97 34.1 28.13 24.96 23.91 23.91 22.85 22.85 22.15 22.15
4800 30.94 30.94 36.91 33.05 27.07 24.96 23.91 23.91 23.91 23.91 23.91 23.91
Please also consider that depending on your mask, you must also set initial advance to 9.84 degrees if running a distributor. On a DIS system, a hex editor will allow you to set it at -59.94 degrees. Fun stuff!
Sorry about the formatting. It should export to a spreadsheet ok though.
Use at your own risk.
20 30 40 50 60 70 75 80 85 90 95 100
400 28.13 23.91 23.91 23.91 23.91 27.07 22.15 17.93 16.17 16.17 11.95 11.95
600 28.13 23.91 23.91 23.91 23.91 27.07 22.15 17.93 16.17 16.17 11.95 11.95
800 28.13 28.83 28.83 28.83 28.83 27.07 22.15 22.15 20.04 17.93 15.12 15.12
1000 28.83 30.94 35.16 34.1 34.1 27.07 22.15 22.15 20.04 17.93 15.12 15.12
1200 28.83 34.1 40.08 40.08 39.02 27.07 22.15 22.15 20.04 17.93 15.12 15.12
1400 29.88 35.16 41.13 39.02 34.1 28.13 23.91 22.15 22.15 20.04 16.88 16.88
1600 29.88 35.16 41.84 37.97 30.94 29.88 26.02 22.85 22.15 20.04 16.88 16.88
1800 30.94 35.16 42.89 35.86 30.94 29.88 26.02 22.85 22.15 21.09 20.04 20.04
2000 30.94 35.16 42.89 35.16 30.94 30.94 27.07 22.85 22.15 21.09 20.04 20.04
2200 30.94 35.16 42.89 36.91 33.05 30.94 26.02 22.85 22.15 21.09 20.04 20.04
2400 30.94 35.16 42.89 39.02 35.86 31.99 26.02 22.85 22.15 21.09 20.04 20.04
2800 30.94 34.1 41.84 37.97 35.16 31.99 24.96 22.85 22.15 21.09 20.04 20.04
3200 30.94 34.1 41.13 36.91 33.05 28.83 23.91 22.85 22.15 21.09 20.04 20.04
3600 30.94 33.05 40.08 35.86 29.88 26.02 23.91 22.85 22.15 22.15 21.09 21.09
4000 30.94 33.05 39.02 35.16 28.83 24.96 23.91 23.91 22.85 22.85 22.15 22.15
4400 30.94 31.99 37.97 34.1 28.13 24.96 23.91 23.91 22.85 22.85 22.15 22.15
4800 30.94 30.94 36.91 33.05 27.07 24.96 23.91 23.91 23.91 23.91 23.91 23.91
Please also consider that depending on your mask, you must also set initial advance to 9.84 degrees if running a distributor. On a DIS system, a hex editor will allow you to set it at -59.94 degrees. Fun stuff!
Sorry about the formatting. It should export to a spreadsheet ok though.
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