timing under boost and B5908

[RADustin]

Hi Guys,

About to tune a '99 LS1 with cam and procharger, running 12212156-> to COS5.

Two main questions-

1.) to get me started, how much timing should I subtract from A0010? I looked at an N/A tune I know made good power and drove well for my high and low octane spark maps. I have heard I should pull 1° for every 1 pound of boost rule of thumb- does this seem right?

2.) Does B5908 add or subtract timing(IE positive number adds, negative number subtracts)? I am using the COS5 B3647 to command 11-11.5AFR under boost as in the tutorial. My concern is that A0010 will pull timing under boost and B5908 will add it back in.


Thanks!

[joecar]

1) start with that rule of thumb (1 degree per psi of boost) until you get access to a dyno (loading type).

2) B5908: yes correct + adds and - subtracts. B5908 is usually full of zeros, or if it isn't you can zero it.

[RADustin]

Thanks Joe.