safc - 2 or 4 cylinder? Tuning above 4000 rpm?

[sandmstreet3]

Ok, so as i am trying to tune the other day, i started to get knock and run leann above 4500 rpms, and i could not change it. I added tons of ffuel up there, and subtraced some and pretty much just did trial and error to try to get my fuel mixture stoich.

Now, before the tuning sesion, my friend told me that my safc settings were slightly wrong. He insisted that the cylinder mode should be set on "4 cylinder," so he changes it from 2 (which i believe my 1g is supposed to be on) to 4.

Now when i go to monitor window, the rpm is way different than what it actualy is. my querstion is this:

Does the safc tune by what rpm its reading? and is this why i cant get any tuning above 4500 rpm?

ps, its running lean, hitting fuel cut, pulling my timing, and im getting up to 12 some knock on 18 psi.

 

[kpt4321]

Due to the way the DSM's ignition system functions, you probably do want it in 2 cylinder more. If the engine speed is reading wrong, change it.

 

[talon1979]

On my SAFC my settings are on 2 cyl, the arrow is in the upper right position and then Karmen for the air flow. Like the guy above me said if the RPM's on the SAFC match your tack the cylinder number should be set right. Every 1G I have seen has had to have been set on 2 cylinders.

 

[Iceman]

It should be on 2cyc with the arrow up right. The AFC reads off of the RPM signal it reads. Exmaple is if your logger says your knocking at 4RPM and you try to richin it up and it does nothin is because the AFC is really riching up 3RPM instead. That just a example for everyone .

 

[HighPSI TSi Guy]

it depends which RPM wire you tap.. if it doesn't match the tach it's wrong