39* total timing....possible??
Thread Starter
Instructor
Joined: Aug 2005
Posts: 133
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From: OKC OK
39* total timing....possible??
Fellas,
I have a 2001 coupe with a Predator tune installed. The other day, I was looking at the real-time data page (1st time in about a year) while lightly revving the engine in the garage. At just over 3500 rpm, the "spark" parameter was reading as high as 39*. Does this number directly translate to the total amount of advance, or does it correlate some other way? The reason I'm asking is that I just can't believe that my car would be happy running that much total advance. What is the stock full advance numbers and when does it go "all in"? Any insight?
R/
Dustin
I have a 2001 coupe with a Predator tune installed. The other day, I was looking at the real-time data page (1st time in about a year) while lightly revving the engine in the garage. At just over 3500 rpm, the "spark" parameter was reading as high as 39*. Does this number directly translate to the total amount of advance, or does it correlate some other way? The reason I'm asking is that I just can't believe that my car would be happy running that much total advance. What is the stock full advance numbers and when does it go "all in"? Any insight?
R/
Dustin
Le Mans Master
Joined: Oct 2005
Posts: 7,088
Likes: 1,829
From: Metro Detroit Michigan
That's in the ball park for almost no load, small throttle opening.
There isn't really any "full advance number" or an "all in".
Timing varies according to a number of parameters. On the stock timing table for instance, there is less advance under load around the peak torque rpm (max cylinder pressure) than there is above or below it.
One might generalize though by saying that under load, the timing doesn't go much higher after 2200 to 2400 rpm, and this number might be between 25 and 29 degrees.
There isn't really any "full advance number" or an "all in".
Timing varies according to a number of parameters. On the stock timing table for instance, there is less advance under load around the peak torque rpm (max cylinder pressure) than there is above or below it.
One might generalize though by saying that under load, the timing doesn't go much higher after 2200 to 2400 rpm, and this number might be between 25 and 29 degrees.
Thread Starter
Instructor
Joined: Aug 2005
Posts: 133
Likes: 0
From: OKC OK
Warp,
Thanks! I had considered the fact that there was no load on the car, but wasn't sure what the computers range of managing the advance is. Truth be told, distributors with mechanical and vacum advances don't seem to mystify me as much....I guess my ability to think beyond the dizzy is limited. :-)
R/
D
Thanks! I had considered the fact that there was no load on the car, but wasn't sure what the computers range of managing the advance is. Truth be told, distributors with mechanical and vacum advances don't seem to mystify me as much....I guess my ability to think beyond the dizzy is limited. :-)
R/
D
