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Only 30 psi of boost?

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#22 ·
mattr66 said:
I never run more than 62. Actually my preferred method is boost referenced with a 20 psi regulator between the manifold and fuel regulator. That way the fuel pressure starts at 40 psi at idle then goes to 60 with 20lbs or more of boost. This makes your fuel pump live a much happier life.
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That how I have and am currently going it as well. No reason to work a pump any harder then is needed. For a DD 75% of the time your pump is working less by about 30% setup that way.
 
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#26 ·
Not his tuning.
 
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#28 ·
IIRC he did a leak check a while back in a dif thread.
 
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#30 ·
TerminatorEngineering said:
So, if your demanding 3000psi, shouldn't he only be seeing around 3000psi? Don't refill properly on the fuel side, or the oil side? While on the highway, I don't run short bursts and the truck does not defuel. Though I am running moded B codes, if that matters.
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TerminatorEngineering said:
Luke, after re-reading this thread, you either have a boost leak or a turbo issue, IMO.

Also, what does the boost do with no chip? I'm still thinking boost leak.
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I was having him check the basics to rule anything out. It is not as simple as commanding a pressure and boom it does it. If that's how others are tuning then THEY ARE WRONG and I'm not going to spell it out for them. Just commanding a pressure doesn't do crap unless the oil regulator is properly matched to pump flow.

There is a chance that oil pressure could be spiking way above where I want it and thus affecting the pulsewidth and pulling fuel back. I do my tuning way different than everyone else evidently and it depends on the ENTIRE SYSTEM working properly. These are the safeties I put in the tuning that have a perfect track record thus far at not blowing up an engine from detonation.
 
#31 ·
Matt, I know it's not that simple and I know that IPR Duty Cycle plays a large role in controlling injection pressure, with that said, I'm still trying to grasp how too much ICP has a direct effect on Luke's low boost? :shrug:

From my experience on my own truck, it doesn't matter if I run a 3200psi tune or a 3800psi tune, my boost is consistant.
 
#32 ·
Don't understand how higher than 3000 psi for ICP would result in the loss of 10-15 lbs. of boost. I hit 4000 psi and hold 32 lbs with stock AD's and used to hit 45 lbs with B-codes and a orginal TN turbo with the same pressure:eek:

To the OP. What is your truck doing when it hits 30 lbs? Does it fall on it's face? Are you still smoking at 30 lbs of boost?

If it's still smoking you have boost leak(s) or turbo problem. If you have no smoke and falling on it's face your defueling.
 
#33 ·
TerminatorEngineering said:
Matt, I know it's not that simple and I know that IPR Duty Cycle plays a large role in controlling injection pressure, with that said, I'm still trying to grasp how too much ICP has a direct effect on Luke's low boost? :shrug:

From my experience on my own truck, it doesn't matter if I run a 3200psi tune or a 3800psi tune, my boost is consistant.
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My tunes automatically pull back the fuel if the ICP gets out of whack to keep from blowing up because of detonation.

I'm not tuning your truck so they will react differently I'm sure. And I'd like you to see you run down the track at 3000 vs 3800 PSI and see if one truly makes more power than the other since yours doesn't defuel........
 
#34 ·
mattr66 said:
My tunes automatically pull back the fuel if the ICP gets out of whack to keep from blowing up because of detonation.

I'm not tuning your truck so they will react differently I'm sure. And I'd like you to see you run down the track at 3000 vs 3800 PSI and see if one truly makes more power than the other since yours doesn't defuel........
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Haha. You won't see my crewcab doing any racing. It's a heavy tow rig and is not geared for racing. Sled pulling, maybe. I know it doesn't defuel, because I can pull grades at 3700+. I would know if it's defueling.:ford:

So Matt in your opinion, Extreme ICP causes detonation? What equipment are you using to collect this data? I know ICP has a direct effect on timing, but I do not know how much effect it has. It seems you may know that number. If you would rather not post it, I accept PM's.

Thanks,
Joey@TE
 
#35 ·
TerminatorEngineering said:
Haha. You won't see my crewcab doing any racing. It's a heavy tow rig and is not geared for racing. Sled pulling, maybe. I know it doesn't defuel, because I can pull grades at 3700+. I would know if it's defueling.:ford:

So Matt in your opinion, Extreme ICP causes detonation? What equipment are you using to collect this data? I know ICP has a direct effect on timing, but I do not know how much effect it has. It seems you may know that number. If you would rather not post it, I accept PM's.

Thanks,
Joey@TE
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I don't let the ICP become a danger factor when a tune goes out. If for some reason the IPR sticks or the tune is wrong, I don't let the ICP become a variable that would cause destruction. If it goes above its tuned ICP then the fuel comes back to prevent being destructive. If I ever tuned for major ICP (which I do not) I would tune for this and allow the high ICP without defuel.
 
Discussion starter · #37 ·
Is that the one hose I tapped into the oil fill instead of the hpop cover and covered my motor in oil test driving it?
 
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#38 ·
I'm having this same problem with a BFH and 355's Matt should remember cause he's been helping me off and on diganosing it. There are no boost leaks, turbo is good cause we swapped one that we knew was good, and Jonathan from swamps tuned on it for over 9hrs and still 35psi. We have tried everything. Now we have resorted to the heads leaking. (like the valves not the gaskets) cause it has no blowby. And compression is somewhat low. It's very frustrating I know...
 
Discussion starter · #39 ·
Why dont we put your turbo on my truck to make sure. haha

Ya its starting to drive me freaking crazy. But first I need to put it on a scanner and see what it reads before moving on. I am super close to destroking my truck. Things a pain in the a**
 
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#40 ·
NE-STROKE said:
Why dont we put your turbo on my truck to make sure. haha

Ya its starting to drive me freaking crazy. But first I need to put it on a scanner and see what it reads before moving on. I am super close to destroking my truck. Things a pain in the a**
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I know how you feel man. Try it being a pulling truck and coming out and not being impressed at all compared to the money u have in it. It kills me to only see 35 psi. But don't de stroke it. It will get worked out. Have you done a compression test? How much blowby does it have?
 
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