Already replaced my airdog fuel filter,have not replaced the water seperator filter yet, not sure if that matters, will be buying a injector asap though.
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Low rail pressure on race tune?
- Thread starter Devon
- Start date
Ok well I'll do that one tonight, do I have to fill it up with fuel before hand? Or will it self prime?
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He never said that it pops the 0087 on the 2700 tune Josh, just the big one. I run the newest acid tune also. If you can start the truck fine after changing a fuel filter than your pump is most likely working fine. If the wires were mixed up it would pump fuel to the tank from the engine so obviously thats working. I sent Dustin an email a few days ago with some logs but I haven't heard anything back from him yet.
I also texted him but no response, I'm sure he'll get back to us.. Most be really aggressive tuning.what have you ran on his tune at the strip madmax?
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I ran I 12.8 at 102 with a 1.79 60ft. defuel really bad the last 17 mph though, also bad 60. When it tune pulls good it pulls hard for sure. I may run down to the track tonight, but the 12.8 pass was from alst weekend. I just got off the phone with him and he hasn't forgot about me just has a few guys infront of me at the moment
I know. He said it holds 23-24k on the 2700 uS pulse tune. There is no reason a truck with a lift pump should drop below 26k on a tune that small unless it has a fuel system problem or a tuning issue (which I said is unlikely with Dustin's tuning). In other words, I would suspect either a supply problem (bad lift pump, maybe) or bad injector(s)/CP3.
What is reasonable rail pressure for a race tune Josh? Because I just replaced my water/fuel seperator,made sure my pressure regulator was set where it is supposed to be 10psi,did a pull to 90 and it held 22,500 ,is that really low?
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I asked for 24,000 rail pressure last night at the track. That fixed the code from popping up. It still defueled though. So maxing out B1123, (went ahead and scaled the maf B0201 to read 100 anything past 2.97 volts too) got rid of the defuel. Then I was back to square one popping p0087. Its got to be just a weak cp3, I don't deny it anymore just wish it was something cheaper/easier to fix.
Way back when, tuning so the rail pressure falls 10-12% (2-3,000 PSI) usually netted the best HP. This applies to a "tune only" truck.
I dont know how it is on a lbz but If you have efilive check the fuel pressure regulator current table, take a log at wot and make the current 0 at wot so the regulator will have full flow at wot.
Ok I will try that, what should my frp be at idle? I see 4,300k actual and that's what it desires aswell. Is that normal?
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I wouldnt worry about it at idle if it is only dropping at wot, look to see what it is at wot. On my LLY it will usally drop to about 0 at high rpms at wot if I can remember. 0 means 0 current and this will complely open the regulator giving you maxiumum pressure.
Ok so I logged the desired fuel pressure regulator current, wot it's desiring 0.045 and it's commanding 2.304 wot if that makes any sense. When I'm not wot it commands and desires 16.327? So Is there a way I can get it to command 0.045 like it's desiring, would that be my problem?
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Yea it says the pid isn't supported but I seen numbers moving after I logged it. Could be nothing though
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I pm'ed you back I bet B1510 desired flow vs current is your problem if it is still stock.
It makes sense becuase with an altered base pulsewidth what the ecm thinks is a certain mm3 value or mm3/second value is actually in reality twice that much, so the regulator needs to open a lot more at the same mm3/s value becuase there is really twice the fuel.
It makes sense becuase with an altered base pulsewidth what the ecm thinks is a certain mm3 value or mm3/second value is actually in reality twice that much, so the regulator needs to open a lot more at the same mm3/s value becuase there is really twice the fuel.
Could this issue caused by all if one single injector that us reading high(4.5-6.5 at operating temp in park)??? What's the chances of my 06 lly having a bad cp3? Also would a different regulator spring for my airdog help?
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