04-09-2020, 10:43 PM
CAUTION! If you are considering this mod please hold off until I can determine if injector timing was also staggered. This was one of PowerDubs concerns along with ignition timing.
I have two indications that this may be the case. First, there is a rapid surge at idle after the engine is warm. I didn't notice this right away, partly because it doesn't do it cold and it is not huge, but it is consistent.
Second, there is a lean spot during acceleration when compared to the initial dyno run. Not toward the higher rpm.
I need to compare injector pulse widths, probably on one and four since they would be easiest to access.
Should have done that first. I suspect the Guhl flash may not be capable of altering individual pulse width, but I don't want to ask until I know that is what is happening.
So I need to locate a scope. A lab scope would work, or some automotive scopes.
I guess it was willful thinking that they wouldn't mess with pulse width, but why not?
On the other hand, it is only a 10 degree difference in 228 to 238. It doesn't seem like enough of a percentage to make a noticeable difference, less than 5%. Will have to check it out.
Ben
I have two indications that this may be the case. First, there is a rapid surge at idle after the engine is warm. I didn't notice this right away, partly because it doesn't do it cold and it is not huge, but it is consistent.
Second, there is a lean spot during acceleration when compared to the initial dyno run. Not toward the higher rpm.
I need to compare injector pulse widths, probably on one and four since they would be easiest to access.
Should have done that first. I suspect the Guhl flash may not be capable of altering individual pulse width, but I don't want to ask until I know that is what is happening.
So I need to locate a scope. A lab scope would work, or some automotive scopes.
I guess it was willful thinking that they wouldn't mess with pulse width, but why not?
On the other hand, it is only a 10 degree difference in 228 to 238. It doesn't seem like enough of a percentage to make a noticeable difference, less than 5%. Will have to check it out.
Ben