another timing ?
 

I have a 92 w350 with a 215 hp p pump with all the free mods ? Is! Would I gain from turning the timing up?

what mods? and is pump stock?

all free pump mods
 

Pump has plate,shimmed Gs,screws turned up all the way stock turbo for now thanks

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Sorry NO plate

Wanna specify screws turned up all the way? Also if your not running a plate you could benefit some from doing afc mods.
Advancing timing will give you more top end power and less bottom end. Typically helps lower egts a litte depending on the setup.

all the free mods
 

Plate out, AFC ff, star wheel maxed, gov springs shimmed, maybe more my friend helped me, well basically he did it lol he's teaching me its my first diesel thanks for the help!

I would look into doing the afc mods and tuning that and maybe a mack plug. The timing isnt really just a jump up and do thing. You need special timing tools and requires some patience.

And from what I understand should help mileage too.

Will increase some depending on the tune and the drivers habits.

You drive around with a heavy enough foot not much is gonna help lol

Some of the characteristics for advanced/retarded timing can be found here at the bottom of the page :tu:

Diesel Timing