This thread is for the results of the testing of the differnece pop pressure at the same size.   

 

ANY REPLIES NOT ON TOPIC AND OR WITHOUT DATA WILL BE DELETED.  

 

I will be running 3 sets of DAP injectors first set at 305 bar, next at 330 and the last at 350 bar.  We are going to compare real world situtations and what the pros and cons are of increasing pop pressure.   All tests will be datalogged and video taped if applicable.   

 

The tune will be EXACTLY the same for all injectors.  al runs done on Lvl 3, so no wiretap being used

 

Quote

Timing Parameters
Fuel Load Timing	3
Low PSI Timing Reduct	5
Timing Reduct Scaling	50
LightThrottle Timing Adv	1.5
Light Throttle Limit	30
Timing Equilzer
1500RPM	17
2000RPM	20
2500RPM	23
3000RPM	28
MAX	30
Boost Level Fueling - CAN Bus
0 PSI	66
1 PSI	66
2 PSI	67
3 PSI	68
4 PSI	70
5 PSI	71
6 PSI	72
7 PSI	74
8 PSI	76
9 PSI	78
10 PSI	80
11 PSI	82
12 PSI	84
13 PSI	86
14 PSI	90
15 PSI	94
16 PSI	98
18 PSI	102
20 PSI	106
22 PSI	110
24 PSI	114
26 PSI	118
28 PSI	120
30+ PSI	120

 

 

Test conditions. 

 

Quote

 

 

1. 0-60 WOT take off, same stretch of road

2. 55 mph egt on same stretch of road showing egt

3. Lugged 45 mph locked od pull to compare spool.  

 

 

 

 

305 BAR

Test 1 0-60 WOT take off, same stretch of road

 

 

 

 

Test 2 55 mph egt on same stretch of road showing egt

 

 

Test 3 Lugged 45 mph locked od pull to compare spool.  

 

 

 

 

 

330 BAR

Test 1 0-60 WOT take off, same stretch of road

 

 

Test 2 55 mph egt on same stretch of road showing egt

 

Canbus fueling is ~1125 and egt right around 710-725*f  ( road is slightly uphill

 

 

Test 3 Lugged 45 mph locked od pull to compare spool.  

 

 

350 BAR

 

Test 1 0-60 WOT take off, same stretch of road

 

 

 

 

Test 2 55 mph egt on same stretch of road showing egt

 

 

Test 3 Lugged 45 mph locked od pull to compare spool.  

Edited February 12, 20187 yr by Me78569

Well I'm going to bring back up this old thread. Now that the temps have gotten hot I am 100% decided that I have to bring my pot pressures back down. Unless I run at least two quarts of two-stroke oil and let off the throttle just right when slowing down the truck will look so bad that it dies. It has almost gotten me into a couple accidents when the power steering stops going around the corner. It has always done this a little bit but the higher Pop pressure has exaggerated it and it cannot be driven this way. I'm at the point where I don't believe that there is much of any benefit to raising the pop pressure. Also now that it's hot out it's hard for me to drive smoke free and it is hazier at idle than I expected as well. Overall I guess I just don't see this as being a benefit really. Once I can get to a point where my truck can be down for a couple weeks I will probably pull injectors and have them repop 2 somewhere around 310bar I believe

It appears you have a manual transmission, I am not sure how the power steering would be effected with the clutch out an in gear?? It would just be like coasting, which is 0 fuel being injected as well. 

5 minutes ago, AH64ID said:

It appears you have a manual transmission, I am not sure how the power steering would be effected with the clutch out an in gear?? It would just be like coasting, which is 0 fuel being injected as well. 

You're right but I can't always be in gear and coasting. Going around the corner trying to shift and it dies. I'd have to 100% change my driving Style 2 leaving it in gear at every single opportunity that I could. It's nearly impossible to make it not lope and the hotter it is outside the worse it is.

interesting results to say the least. 

What did you have them set too?

7x.013 340 bar... Also have .093 tubes

10 minutes ago, Dodgeih said:

Also have .093 tubes

 

Betcha if they where stock it would hold up better. 

2 minutes ago, Mopar1973Man said:

 

Betcha if they where stock it would hold up better. 

Agree but unfortunately I don't have that option. Still doesn't change my mind that the benefit is very slight in my opinion. Not likely worth the probable added wear

I wish @Me78569 didn't give up his truck so quick I love to see the out come of his high pop pressures. 

I had about 25k on my injectors with 350 and 330 bar.  some 80+ days and some 0 days.   

 

Highway towing etc.    I think 340 is too high.  I think 330 was about right for my application.  I seen a pretty big difference going to 330 from stock, but not a huge amount going from 330 to 350, and there were draw backs at 350 like you are seeing.  

 

 

I really dont see how it could wear more truthfully.  The pump is going to create WAY more pressure during the stroke than the pop pressure.  

 

Remember Bosch says 327 bar is within spec.

6 minutes ago, Me78569 said:

Remember Bosch says 327 bar is within spec.

 

 

293 bar to 327 bar is within stock specifications.

On 6/13/2018 at 9:32 PM, Me78569 said:

Highway towing etc.    I think 340 is too high.  I think 330 was about right for my application.  I seen a pretty big difference going to 330 from stock, but not a huge amount going from 330 to 350

 

So would a safe bet be get pop pressure set to 330 and have it drop to 320 or so? DD with hauling wood/dirt here and there…

I wouldn't unless you want to R&D with it.   

 

 

On 7/11/2018 at 12:18 PM, Me78569 said:

I wouldn't unless you want to R&D with it.   

 

 

Nick, I was talking to Mike, and I was thinking of 315 Bar on my 100hp injectors. What are your thoughts? 

 

Bear in mind I still have an S03, and I'm willing to play to see if I can get this smoke under control. 

Edited August 20, 20186 yr by pepsi71ocean

300-314BAR is Bosch spec for the injectors on a VP44 Dodge.  315BAR is not going to be much change.

19 minutes ago, dieselautopower said:

300-314BAR is Bosch spec for the injectors on a VP44 Dodge.  315BAR is not going to be much change.

 

Don't you mean 293 to 327 bar? So 4,250 PSI equal to 293 bar and 4750 PSI is equal to 327 bar. At least from the Dodge FSM book.

 

Edited August 20, 20186 yr by Mopar1973Man

That is a wider range than the Bosch ESI[Tronic] specs for the stock injectors.  Operating envelope given by dodge is broader than Bosch has for parts spec.

Just now, dieselautopower said:

That is a wider range than the Bosch ESI[Tronic] specs for the stock injectors

 

Thank you for specifying that... I know the Bosch ESI[Tronic] I might have to fire it up and look it over. 

Thank you for sharing the Dodge FSM specs.  

30 minutes ago, dieselautopower said:

300-314BAR is Bosch spec for the injectors on a VP44 Dodge.  315BAR is not going to be much change.

 

1 Bar is 14.5038 PSI.