I've been loosing prime lately.

 

* Park nose downhill, starts fine - uphill, hard to start

* Pressurized the return lines from tank filler neck, no fuel leaks visible (did hear a hiss from the top of fuel module - guessing take vent)

* Checked all inbound and return connections, everything is dry (replaced sealing rings/grommets for banjo fitting in back of head and tee 10 months ago)

* Oil level is fine

 

So at this point I feel like all external fuel lines/connections are sound.

 

I drive like an old man most of the time.

However the other night, I turned the quad up a little and got on it for a few seconds. 

The next couple of days I notice the hard start issue.

 

Questions:

 

* Would getting on the throttle blow out a crossover tube or injector O-ring?

* Can you have a faulty O-ring and not get fuel mixing with motor oil?

 

22 hours ago, Mopar1973Man said:

Like myself I'm popped at 320 bar on my 7 x 0.010 injectors. Touch 22 MPG once in awhile. I'm down to about 7% engine load at idle from the 13% I had originally when I installed so I'm about half life with these injectors. About the first 20k to 30k it stayed close to 11 to 13% but now starting to wear and lose its pop pressure at miles are racked up 1,000 miles per week. 

 

I really like the higher popped injector pressures on my truck. I really think that all injectors should be popped higher, especially the larger ones. It really helps with pre-boost spooling. Even with my smarty it helps with the pre-boost spooling better then adjusting the TM and D' numbers.

11 hours ago, pepsi71ocean said:

 

I really like the higher popped injector pressures on my truck. I really think that all injectors should be popped higher, especially the larger ones. It really helps with pre-boost spooling. Even with my smarty it helps with the pre-boost spooling better then adjusting the TM and D' numbers.

Pepsi, you're at 320 right? I've read that high pop pressures can cause hard starts in cold weather. You and I are at the same altitude and area at least when you're in Reading. Any trouble cold starting in our winters? Curious because injectors are on my short list and I'd like to try higher pop pressure.

 

I just noticed your sig. and I see your popped at 322.

Edited October 11, 20195 yr by dave110

Update:

 

Injector shop built me some 150hp's.

New BD nozzles (has 8 holes).

Popped at 320.

 

So new sticks, O-rings, O-rings for cross over tubes.

Downloaded Moparmans Economy Tune.

 

I haven't driven it much but I'm super impressed.

Lower EGT's than my 100hp's.

Quieter, smoother idle.

 

I parked it nose uphill and I'll check it this evening to see if I've fixed the lost prime issue.

However I am hopeful!

 

Now, I've got to upgrade this HY35.

Suggestions?

Edited October 14, 20195 yr by Octafish

19 hours ago, Octafish said:

I haven't driven it much but I'm super impressed.

Lower EGT's than my 100hp's.

Quieter, smoother idle.

 

Impressive. At least there is now confirmation that 150 HP @ 320 bar is a good combo. That 8 hole should be good for MPG.

 

Tidbit... The winter time offset should be about -20*F from engine oil temp and coolant temp. Still batting good 20+ MPG yet with temps already in the +10*F in the mornings. 

 

19 hours ago, Octafish said:

Now, I've got to upgrade this HY35.

Suggestions?

 

62/68/12 would be a good turbo (no exhaust brake). Might need to tweak the fuel map slightly to control smoke.

On 10/10/2019 at 8:38 PM, dave110 said:

Pepsi, you're at 320 right? I've read that high pop pressures can cause hard starts in cold weather. You and I are at the same altitude and area at least when you're in Reading. Any trouble cold starting in our winters? Curious because injectors are on my short list and I'd like to try higher pop pressure.

 

I just noticed your sig. and I see your popped at 322.

 

I didn't have any issues going down to about 20f, and that was about when I downed the truck for mechanical work.

 

I did have issues at first with starting, but I can't tell if it was transmission related or engine related, but they did go away. The truck stalls allot, but I had to drop my valve body as it wouldn't do it in manual 1, only drive. Now to be fair, the truck did this as well beforehand with the injectors before I pulled to get them popped. 

 

The truck idles smoother and runs like a raped ape I can assure you that. 

3 hours ago, Mopar1973Man said:

 

Impressive. At least there is now confirmation that 150 HP @ 320 bar is a good combo. That 8 hole should be good for MPG.

 

I do believe it's correlated Mike. As I told you on the phone, popping 50hp injectors at 325bar I think will cause a issue, but larger injectors such as 150s will thrive at 325bar. 

 

 

I think there is a safe range for higher pop injectors based on the size. There later the size the more the slack you can take out of it. 

3 hours ago, Mopar1973Man said:

 

Impressive. At least there is now confirmation that 150 HP @ 320 bar is a good combo. That 8 hole should be good for MPG.

 

Tidbit... The winter time offset should be about -20*F from engine oil temp and coolant temp. Still batting good 20+ MPG yet with temps already in the +10*F in the mornings. 

 

 

62/68/12 would be a good turbo (no exhaust brake). Might need to tweak the fuel map slightly to control smoke.

For my driving style, this may be the ultimate tune for my setup.

I feel like I have the best of both worlds. Power and economy.

The truck has more than enough power for a daily driver.

And I'm very anxious to check mileage on my next trip.

 

And thanks for the turbo recommendation.

Do you know of a turnkey kit available out there?

I'd like to make the swap as painless as possible.

The HY needs to go.

 

 

It now holds prime just fine.

Perhaps the injector 0-rings were the problem.

They were very flat, therefore the old injectors had no resistance when removing them from the head.

@dave110 if you're not in a rush. Give me a few weeks to put the Dodge back together and you can take her for a spin and see how the motor handles. I'm being told it will be a cold winter.