Ok guys I need some schooling. Can you run a P-Pump on your 24V and still have some V2 tuning options? Or do most of the tuning parameters lie within the VP44?

36 minutes ago, JDHudsn said:

Can you run a P-Pump on your 24V and still have some V2 tuning options?

 

No.

 

There is no electronic tuner with a P-pump. Not to mention there is no timing advancement with a p-pump. It's a static timed pump what timing you set it for is the timing across the range of RPM.

 

36 minutes ago, JDHudsn said:

Or do most of the tuning parameters lie within the VP44?

 

Yes.

 

VP44 injection pump has a dynamic timing and can be advanced as much as 30 degrees before TDC. You can control timing over a wider range of engine load and RPM.

I have heard through the grapevine that Bosch has said that the VP44 is the most advanced injection pump they have ever built. With the common rail they moved the smarts out of the pump and into the electronics that then control the injectors. 

The p-pump is 100% mechanical. You honestly don't even need a battery or alternator to run the truck once the truck has started. You can run it with a simple zip-tie in place of a relay to keep it running. (With a mechanical lift pump). There are 0 electronic smarts to the truck with the p-pump. Everything is mechanical. 

5 minutes ago, Quadzilla Power said:

I have heard through the grapevine that Bosch has said that the VP44 is the most advanced injection pump they have ever built.

@Quadzilla Power So why did the VP44 get such a bad rap? The reliability of the early pumps due to weak lift pumps?

2 hours ago, JDHudsn said:

@Quadzilla Power So why did the VP44 get such a bad rap? The reliability of the early pumps due to weak lift pumps?

 

There is 4 ways to kill a VP44...

 

1. Low fuel pressure. Typically low fuel pressure problems caused the P0216 code.

2. Poor Filtration. I've seen several trucks with the stock filter can filled with dirt in the bottom and using junk filters. Too much debris usually got to the injection pump. 

3. Low Lubricity. Bosch states that fuel should be 460 HFRR or less of optimal lifespan. When ULSD was released it raised the bar to 520 HFRR which is outside the realm of Bosch specs. Too many people used cetane booster and fuel injector cleaners that raised the HFRR score even more producing more wear. Hence the start of the "2 Cycle Oil Theory" years ago.

4. Excessive AC noise. This is problem that most are fighting for automatics with TQ Converter lockup issues. But they would band-aid with noise filter or some lame mod. The AC noise would eventually fry the PSG on the VP44. Typically toss P025x codes. 

 

 

Way better than I could have ever put it. 

@Mopar1973Man how long did your original VP44 last?

3 minutes ago, JDHudsn said:

@Mopar1973Man how long did your original VP44 last?

 

1st Pump lasted 50k miles. Failed from low fuel pressure less than 8 PSI. P0216 Code.

 

2nd pump lasted 243k miles. Failed from pure wear. Stuck in full advancement. P0216 code.

 

Currently at 346k miles. 

Edited June 15, 20186 yr by Mopar1973Man