Ho vp44

[Bill Laary]

Anyone know the timing advance on so and ho vp 44 pumps 

and the hot rod pumps   Want to tune a quad adr

thanx  

Edited January 16, 2020 by Bill Laary
Misspell word

[Me78569]

no clue, I wouldn't bother changing a tune unless it needs it between the 3.

[Bill Laary]

Don’t want to advance the timing for the hot rod pump as much as the SO pump as it has more advance built in but I didn’t know how much timing advance it has

[Me78569]

You are operating under the assumption that the hot rod adds alot of timing.  

 

V2 tuning replaces the timing command rather than adding to it so you are far less likely to run into issues with "overtiming" like you would with other tuners.

 

Follow the standard tuning methods outlined and dont worry about it unless you have bucking at a given point.  If you do back timing by .5* until it goes away.

 

 

From my point of view nothing changes.

[Dieselfuture]

Yhea what he said ^^^

If I had to guess its about  2 - 3 degrees, purly on my hunch

[Bill Laary]

OK thanx a lot I didn’t know it replaces what was in there 

 my  whole build only has 5000 km on  and I have a spare SO rebuild 

[Me78569]

If I remember right ( i might not ) the offset we were seeing during test of cold start / idle conditions was ~1* IE the ecm said 15* on my SO truck but 14* on a HO in the same conditions.  

 

It really wasn't a big difference.  Not enough to change the tune much unless you are trying to get every last mpg out of it.  But if that's the case you would need to road test to adjust for your truck anyways.  

[Bill Laary]

Thanx I’ll watch it as I tune I was told by a shop up here it could be 5-8 

 

1 or  2 not bad I’ll just be careful watch it

[Me78569]

Yea..no 5-6* is way way way more than it actually is.

[Mopar1973Man]

Timing needs to be based off of cetane, injector pop pressure, and for other conditions. You could have a Hotrod pump and then have low popped injectors like 305 bar and that would negate most of that. Injectors fire larte but the pump fires early. Then cetane could swing it early or late again depending if the cetane is low or high. 

[BCole99]

I'm still really new to this forum. My Truck starts bucking at cruising speeds almost immediately after it shifts into over drive. Would this be a timing adjustment you referred to? If so which timing adjustment would I adjust on my Quad?

[IBMobile]

Could this be the torque convertor locking and unlocking you're felling?   What is the AC voltage at the alternator?

[BCole99]

1 hour ago, IBMobile said:

Could this be the torque convertor locking and unlocking you're felling?   What is the AC voltage at the alternator?

I don't believe its the torque convertor locking up it doesn't feel like that. It starts out surging or bucking mildly and gets harder and harder until its jerking the truck violently. Tonight when I test drove it I turned the overdrive off when it was surging and it instantly went away and came back when I turned the overdrive on. If I let off the throttle it goes away, if I accelerate it goes away. It only does it when I maintain a certain speed and it shifts into overdrive. I have also noticed if I put my quad in valet mode it does it but very mildly. I've tried adjusting my fuel stretch up and down makes no change. I also tried adjusting the minimum pump tap fueling percentage from 10% down to 5% no change. I Tried adjusting the light throttle timing adv and the light throttle load limit % with no change i'm also not sure how far I should adjust them either. Could the Apps cause this?