VP Dynamic Timing Vs. Advancing

[01CumminsSport]

i did 464/792 then ran a 12.7 at 108 shortly after

 

[coon smile]

i did 464/792 then ran a 12.7 at 108 shortly after

#'s seem low for the ET.

 

[01CumminsSport]

there really low i was doing 150hp more last month on 2 different dynos, but that was with a silver bullet and now with the s472 i cant get it to lite or make full boost on the dyno so an adjustable timing gear will help alot,
And i have 6 time slips for the day that are all with in .20 sec and 3 mph

 

[TURBOLVR]

whens the next time you will run it?

 

[01CumminsSport]

whens the next time you will run it?

after the new cam head and pump are on, so most likely next year unless i head down south do a strip thats open during the winter

 

[VMacKenzie]

Someone posted a timing map they found for the VP44 once on TDR and as I recall it started at 8 degrees and topped out at 25.

 

[Rollin Coal]

if i remember right, it gets to over 30* with a box on it.

 

[coon smile]

I was told that unplugging the IAT sensor will give you more timing than a programmer/box will.

 

[01CumminsSport]

when you unplug it reads -40* so the truck thinks its really cold out, but i dont think the timing would be advanced unless they thought raising the timing would raise cyl temps for cold weather running

 

[Smokem]

You can use the offset keys for either the cam gear or pump gear, ~ 24-25° is the limit with an unmodified piston/case.

 

[coon smile]

when you unplug it reads -40* so the truck thinks its really cold out, but i dont think the timing would be advanced unless they thought raising the timing would raise cyl temps for cold weather running

The person I heard it from was pretty sure the timing was advanced. It showed a small increase in power on the dyno.

 

[BgBlDodge]

Advancing the timing will increase cylinder temps and decrease EGT's to a point. Fuel is being injected earlier in the stroke so it's burning longer inside the cylinder.

 

[01CumminsSport]

ill try the IAT thing in a few when im back on the rollers. i know on a gasser it ritchens it up when you unplug the ECT or IAT wonder if its the same in a diesel

 

[BigB82789]

Mine would always kick into high idle with the iat unplugged.

 

[01CumminsSport]

Mine would always kick into high idle with the iat unplugged.

i take it you have a smarty then, ya its reading 40 below so it would go into high idle

 

[Black Ice]

anybody ever thought of an adjustable pump gear for the vp44

 

[coon smile]

I have had my IAT unplugged for quite some time. It only goes to 3 cyl high idle when it's cold outside. When it was warm, it never went to high idle with the IAT unplugged.

 

[sstockton]

anybody ever thought of an adjustable pump gear for the vp44

I like that thought. Hopefully soon we'll see if it would be worth it.

Smokem- You say without modified piston or case, 24-25 is max.
What do you mean by case?
Sean

 

[01CumminsSport]

Smokem- You say without modified piston or case, 24-25 is max.
What do you mean by case?
Sean

im guessing he means pump case, how the timing plunger only has so much space to move in there

 

[TURBOLVR]

are the cam and VP gears the same size and bore?
DODGE CUMMINS 5.9 BILLET ADJUSTABLE (ADJ) CAM GEAR :eBay Motors (item 150303558832 end time Dec-07-09 08:57:42 PST)