I’m currently on a tune making 408whp.

cams, 3071r all supporting mods. Converted to SD.

recently installed an fp manifold from stock. Fuel trims are in the +5-7 range now.

If I just adjust my injector scaling or latency to compensate for the leaning of the manifold? Will the fuel maps need to be altered also??

thanks in advance

 

Your trims sound fine. Since your boost curve is likely to have changed with the new manifold you might want to touch up your WOT fueling and timing

 

Ok cool. So even if the trims seem sightly lean I shouldn’t adjust latency or scaling at all?

Thank you for the response 👍

 

It depends how **** you are. +/- 10% isn't terrible.

 

You wouldn't change latency or scalings anyways. Those are constants when tuned properly and should never change. The change in exhaust has changed VE which would be adjusted with the MAF/VE tables on a SD setup.