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04-11-2018, 06:17 PM | #151 |
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Location: Hampton Roads Va
Vehicle:2019 WRX STI silica black |
I can't run E70 or higher without running out of fueling. That's with an AEM in tank pump and water meth port injection. I'd REALLY like a better HPFP.
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04-12-2018, 07:35 AM | #152 |
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Tri-State
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i don't think mine is anything to do w ethanol at all. but i had my AP on for startup, fuel pressure is 53, but it ramps to almost 1000 in a split second when the starter button is pressed.
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04-12-2018, 01:04 PM | #153 |
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Cold starts on ethanol are always typically longer. May not be what is happening here. If my car was not in the garage overnight and lower than 50 degrees it was always hard to start.
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04-12-2018, 01:09 PM | #154 |
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04-12-2018, 02:50 PM | #155 |
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TXIC
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04-18-2018, 11:22 AM | #156 |
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Interesting article around this topic:
http://www.enginelabs.com/engine-tec...inner-crowned/ |
04-18-2018, 03:05 PM | #157 | |
Scooby Specialist
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Join Date: Dec 2016
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South East
Location: Hampton Roads Va
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06-11-2020, 11:10 PM | #158 |
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BAIC
Location: Sacramento, CA
Vehicle:2015 WRX Premium Crystal White Pearl |
Hate to bump an old thread, but I have been running around e60 for the past year - 15k-20k miles. I've cycled 91 a few times throughout the year, but probably have gone about 8k miles without. At first I was losing fuel pressure up top, going from 2300 psi to 500 psi during WOT. I figured it was my LPFP going out, so I took out my DW300c and reinstalled it.
Now I am dealing with a different issue of my fuel pressure dropping to ~50 psi whenever I take my foot off the accelerator. This happens while coasting on the highway. Idle fuel pressure is normal, and so is my fuel pressure when accelerating. Is this a sign of my HPFP sticking? I just filled up with 91 to see if that will relieve the issue. Haven't done too much WOT since I don't want fuel cut and my engine to go kaboom. Currently at about e20, since I filled up with a quarter tank of e50. edit: Protuned and modded Nvidia catless j pipe q300 catback ebcs prl fmic cobb flex fuel ibr full tgv deletes egr deletes dw300c |
06-11-2020, 11:43 PM | #159 | |
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06-12-2020, 11:54 AM | #160 |
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Just checked it. Fuel pressure was at 58 psi when I turned the key to the "on" position. Did not turn the car over.
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06-12-2020, 12:15 PM | #161 |
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Is this happening only with ethanol blends or 91oct too? When did you first notice it and how?Was it after cycling 91?
I am on e50 for 22k miles straight so far, no cycling and no issues. Wondering if its just a matter of time or vehicle specific. I also use top lube but minimally, not as recommended. Like 1/4-1/2oz per fill up, roughly, on most fillups. Dunno if it helps except my peace of mind. I did hear an electrical dc voltage kind of hum noise at first when running e50, i always thought it may be hpfp related. Really faint sound/hum. It went away and i am not hearing it anymore. Hope you get it resolved, must be frustrating. |
06-12-2020, 12:57 PM | #162 |
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Just posting my thoughts. Been running straight E85 with the Nostrum HPFP for a while with no issues. Cold starts are still rough though.
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06-12-2020, 05:19 PM | #163 | |
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Quote:
The fuel pressure drops all the way down to 50-60 psi when I take my foot off the throttle. It will stay there till I apply throttle. So if I’m coasting, I’m coasting at like 50-60 psi. This happened on e62, e50, and now e20. Haven’t done any WOT, but my fuel pressure seems pretty normal otherwise. |
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06-12-2020, 07:03 PM | #164 |
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I just took out my dw300c and put in an aem 340lph. I’ll update you guys on if that had any effect. It seems like my fuel pressure mins are getting higher, but it could be a coincidence from lowering the ethanol content.
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06-12-2020, 10:28 PM | #165 |
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I was wrong earlier. The checking fuel pressure thing was only to diagnose a seating/o-ring issues. So hopefully this fixes it!
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06-12-2020, 10:43 PM | #166 |
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Changed out my LPFP to the AEM, pretty similar results. While doing city driving, my fuel pressure minimums seemed to go up a little after the switch. However, the minimum pressures went back down to double digits again while driving on the highway.
Why does my fuel pressure stay normal when I am in neutral or with my clutch engaged at a full stop? But when my pressure drops when driving highway and take my foot off the throttle? Is there something different? |
06-13-2020, 12:17 PM | #167 |
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If it's dipping to 40-50psi it's your HPFP. Chopping the throttle will piss it off and make it stick when it's already being temperamental/hotter, I figured that out in 2016. I believe the tolerances are so small, that's why you probably have problems when the engine is being run with more demand/temperature.
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06-13-2020, 12:48 PM | #168 |
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It doesn’t matter what my oil temps are, or whether my car is cold or not. The psi will drop to double digits unless I push in the clutch or go into neutral. Anyone have any luck with the nostrum HPFP?
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06-13-2020, 01:59 PM | #169 |
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I don’t think the oem one is too expensive, so I would go that route and try and run a few more tanks of 91-93 to keep it happy.
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06-18-2020, 01:24 PM | #170 |
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06-18-2020, 01:25 PM | #171 |
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Sorry for being captain obvious. I was complete blind to the original date of the thread and someone revived it.
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09-11-2020, 10:00 AM | #172 |
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I am having the exact same issue. I’ve replaced the lpfp and reinstalled 3 different times and the issue still persists. Only time the pressure drops is while coasting in gear with the foot off the gas. I’ve also started noticing a rough idle with occasional cylinder roughness. Did you ever figure out the problem? I just ordered a new hpfp.
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04-14-2021, 01:43 AM | #173 | |
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Quote:
You ever figure this out? Started happening on mine recently |
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04-19-2021, 09:26 PM | #174 |
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SCIC
Location: Carson, CA
Vehicle:2017 WRX Ice Silver Metallic |
E85 DI high pressure fuel pump
I'm tuned for E60, but after the second tank of E60 my HPFP started acting up, so I've been on E50-E55 exclusively, since I'm tuned on E60, am I okay to just stay on my E60 map or should I tell my tuner to revise it for E50? (I was dyno tuned flex fuel for E60)
Last edited by OHHFSHO; 04-20-2021 at 09:34 AM. |
04-20-2021, 08:00 AM | #175 |
Scooby Specialist
Member#: 459692
Join Date: Dec 2016
Chapter/Region:
South East
Location: Hampton Roads Va
Vehicle:2019 WRX STI silica black |
Are you tuned for flex fuel? If not you should be...
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