Gloria: OBS build thread
Logistics Pro
Joined: Oct 2008
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From: Avilla, IN
I can't see how this many people could be sucking the reservoir dry. I mean think about guys that run dual HPOPs with massive non-hybrid injectors. They would really be sucking the res. dry in no time if that was a real concern.
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Hotshot
Joined: Feb 2009
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From: Plankinton, SD
edit: I guess you said duals with nonhybrids, from what I was told that is why the res addition was designed, so I'm sure a lot of those have it.
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Well guys, got some more data runs in last night. Ran the first run normally, MAP sensor plugged in and reproduced the bucking.
Then I unplugged the hose to the MAP sensor and plugged the intercooler tube with a block off fitting.
No bucking there ^, with the catch that the truck runs a lot slower without the MAp sensor plugged in. You can see the Injector pulse width is pretty much half, its a dog, but I was at full throttle and no bucking. So my next step is to do a boost regulator deal and see if that helps. But it may have been the MAP sensor not likely all the boost ...
Also appears that Im leaving something on the table in terms of throttle position sensor. Full throttle is 3.92 volts. Isnt it supposed to be 4.5 or something? That may explain some of my feelings that it could be fueling a bit harder..
Then I unplugged the hose to the MAP sensor and plugged the intercooler tube with a block off fitting.
No bucking there ^, with the catch that the truck runs a lot slower without the MAp sensor plugged in. You can see the Injector pulse width is pretty much half, its a dog, but I was at full throttle and no bucking. So my next step is to do a boost regulator deal and see if that helps. But it may have been the MAP sensor not likely all the boost ...
Also appears that Im leaving something on the table in terms of throttle position sensor. Full throttle is 3.92 volts. Isnt it supposed to be 4.5 or something? That may explain some of my feelings that it could be fueling a bit harder..
Post Fiend
Joined: Dec 2010
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From: Orrville, Ohio
Sounds like you may be on to something with the MAP sensor.
At any rate, it doesn't look like you're running out of oil.
Crazy how much the PCM backs everything off with the MAP unhooked, isn't it?!
At any rate, it doesn't look like you're running out of oil.
Crazy how much the PCM backs everything off with the MAP unhooked, isn't it?!
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Yes Glenn it is with AE (put into excel). You will find the output you are looking for under "Accelerator position Sensor" < or something like that, it is one of the first ones in the drop down menu, NOT under throttle position as I found out after 25 mins of looking.
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Logistics Pro
Joined: Oct 2008
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From: Avilla, IN
OK. Setups like that could already have an oil supply like Travis mentioned. Also hybrids do use less oil. Big ones not so much, but you know what I mean. And realize on mine when it happened was on quite a long, hard pull. Unless you have a detuned big power truck, you can't tow like I do, you'll burn it up. Also, I tow in the hot tune, that tune uses quite a bit of oil. I'm in it hard for a long time, that's how I see it happening on mine. JMO of course.
edit: I guess you said duals with nonhybrids, from what I was told that is why the res addition was designed, so I'm sure a lot of those have it.
edit: I guess you said duals with nonhybrids, from what I was told that is why the res addition was designed, so I'm sure a lot of those have it.
Well, I've rambled on long enough to confuse myself.
Andrew, based on your data I'd say you definitely need a boost fooler.
Hotshot
Joined: Jun 2007
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From: Austin, TX
The PCM backing off injector pulsewidth with the MAP unplugged is tuning related. Gearhead uses the MAP sensor to gradually bring the pulsewidth up as boost rises. If boost never rises, the tune will never call for full fuel. Other tuners, such as some of my race tunes from Tony Wildman do not do that. I can unplug the MAP with those tunes and it will still call for full fuel, ICP, etc.
Postmaster
Joined: May 2011
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From: Monroe City in
Just a quick question, I thought when you unplug the map to see if it is faulty, you unplug the electrical plug in not the hose? Or does it really matter? I figure it would cause if the sensor is plugged in and hose is unhooked it won't default like it would if the PCM isn't reading the map sensor there.
Hotshot
Joined: Feb 2009
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From: Plankinton, SD
I don't understand that exactly. The HPOP is going to pump a certain volume of oil based solely on engine rpms. Some of the oil is dumped back into the crankcase (as I understand it) and some is pumped into the oil rails. The amount that goes each place is controlled by the IPR DC%. Maybe I've overlooked something, but by this logic it seems that it doesn't matter what size injectors you are running or even how hard the engine is working. What would cause the reservoir to run empty would be high rpms for long periods of time. Of course at high rpms the LPOP will be feeding more oil the res. too, so that doesn't make sense necessarily either.
Well, I've rambled on long enough to confuse myself.
Andrew, based on your data I'd say you definitely need a boost fooler.
Well, I've rambled on long enough to confuse myself.
Andrew, based on your data I'd say you definitely need a boost fooler.
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Well Guys,
Good news, it was the MAP sensor not liking the boost. I bought a boost cooler from Riffraff, which was sent very promptly. Arrived today which was awesome, so I put it in. Took the truck for a couple test hits, and not one buck to speak of. Was up to operating temp and pretty much did 5 hard hits from a stop, and rolling into 3rd gear. Couldn't make it buck at any point, so it was the MAP not liking all the boost.
So anyways, that problem is solved, still sorting out this and that but I may be able to get a little video soon.
-Andrew
Good news, it was the MAP sensor not liking the boost. I bought a boost cooler from Riffraff, which was sent very promptly. Arrived today which was awesome, so I put it in. Took the truck for a couple test hits, and not one buck to speak of. Was up to operating temp and pretty much did 5 hard hits from a stop, and rolling into 3rd gear. Couldn't make it buck at any point, so it was the MAP not liking all the boost.
So anyways, that problem is solved, still sorting out this and that but I may be able to get a little video soon.
-Andrew
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Joined: Feb 2009
Posts: 10,408
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From: Plankinton, SD
Good to hear Andrew! I put my adrenaline in today and my icp went back up over 3000 and the power is much better again too. Hopefully after 6 times putting a hpop in it my truck finally found one it likes!