strange piston failure?
#21
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I can post plug pictured soon as I'm almost back to the truck. so why do you guys think my afr seems to be rich but I'm lean failing? maybe I should rig up a pressure gauge and drive it with the new engine to see what it does when I'm in it. I'm still running stock rails and reg with a single walbro450
#22
TECH Junkie
iTrader: (4)
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I can post plug pictured soon as I'm almost back to the truck. so why do you guys think my afr seems to be rich but I'm lean failing? maybe I should rig up a pressure gauge and drive it with the new engine to see what it does when I'm in it. I'm still running stock rails and reg with a single walbro450
Without a boost referenced regulator for every pound of boost you're losing a pound of fuel pressure, So you may have a base pressure of 58lbs but at 15lbs of boost the injector is only able to flow 43lbs.
#23
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that makes perfect since to me. so I can see the benefit of running one for sure when you out it like that but arnt their all kinds of people running stock rails and fpr and making power?
#24
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would adding a second pump help combat that issue at all. I guess I'm going to have to get rails and a reg but would still like to play around with it some more. it's all good learning to me
#31
#32
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I'm running id850 injectors. only using about 40% I can check some logs though
#33
9 Second Club
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I can post plug pictured soon as I'm almost back to the truck. so why do you guys think my afr seems to be rich but I'm lean failing? maybe I should rig up a pressure gauge and drive it with the new engine to see what it does when I'm in it. I'm still running stock rails and reg with a single walbro450
#34
10 Second Club
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having a boost reference or not means exactly jack....if the car is tuned for it. SBCGENII hit it, if the VE or MAF curve is tuned to handle the drop in fuel pressure as boost rises, then its fine. I would have thought there would have been more marks on the piston face if it detonated itself to death, but too many in here agree its detonation for it not to be.
#35
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having a boost reference or not means exactly jack....if the car is tuned for it. SBCGENII hit it, if the VE or MAF curve is tuned to handle the drop in fuel pressure as boost rises, then its fine. I would have thought there would have been more marks on the piston face if it detonated itself to death, but too many in here agree its detonation for it not to be.
#36
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my plan is to bring it back to the track tomorrow night because it's dead wensdays and give it some fuel and bring springs with me and start it out with no boost and work my way up. I will probably just use my gauge for Checking fuel pressure and build and extension hose into the cab. anouther thing to note is I think my alternator is during because if you wind on it the headlights are dimming. may be a big part of the failure assuming it was doing it that pull
#37
10 Second Club
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The MAF sensor doesnt know what boost is, only airflow. I have a sticky in the PCM section talking about how to run a MAF on a high hp setup. If you want the PCM to read boost, you'll need to move to a custom OS and a 2 or 3 bar map sensor depending on boost. This is all extra information, all my original post meant was that if the car was tuned originally with the same fuel pressure drop under boost, its not the root cause of your issue unless something has changed.
#38
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The MAF sensor doesnt know what boost is, only airflow. I have a sticky in the PCM section talking about how to run a MAF on a high hp setup. If you want the PCM to read boost, you'll need to move to a custom OS and a 2 or 3 bar map sensor depending on boost. This is all extra information, all my original post meant was that if the car was tuned originally with the same fuel pressure drop under boost, its not the root cause of your issue unless something has changed.
#39
10 Second Club
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I'm running 3 bar sd right now. the problem is that I tuned this truck all by myself so I didnt account for fuel pressure drop with boost so I guess I will have to figure out what I need to change to account for that. I only know enough about tuning to get myself in trouble so far haha
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