October 26, 2021, 05:08:36 AM
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Author Topic:  SHO low fuel pressure help  (Read 1219 times)

Offline Hopelessdj

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SHO low fuel pressure help
« on: May 04, 2021, 08:25:20 PM »
Ok so my car likes to drop pressure to around 7-9kpa at wot. I have a brand new hpfp and lpfp, 02 sensors, coils, plugs, blow off valves and intercooler pipes (had a boost leak too). 

The car doesn't drop pressure on my lower boost tune or stock tune. Only when running the "average" boost level tune from  gearhead. It should be able to run this tune just fine, it's nothing special. I don't have bigger turbos or xdi or anything crazy done to the car. Ortiz also couldn't finish tuning due to the pressure drops, we had to keep a lower boost tune.

When I had my boost leak, the tunes all held pressure perfect, cause I wasn't hitting that much boost. As soon as I hit like 15psi it'll drop and won't recover to anything above 10 or 11 kpa at wot.

Any ideas what to check next? Could this be the most my stock fuel system can handle or do I have a bad part I'm still chasing? I had assumed something must be wrong cause 2 tuners are telling me they normally run these levels just fine on cars with my kind of set up.

Also not sure if it's worth noting but the pressure dip worsened slightly after putting in new 02 sensors while chasing the problem. Tuner says he believes the sensors were going bad and asking for more fuel which made the pressure a little better. I find it odd that it would have gotten better pressure then but can't now tho
« Last Edit: May 04, 2021, 08:42:23 PM by Hopelessdj »

Offline SHOdded

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Re: SHO low fuel pressure help
« Reply #1 on: September 23, 2021, 02:47:13 PM »
You did not mention what year your SHO is, that would be helpful.

Might have to look into a new FPCM. do you have a 3 bar map installed? check all the IAT and MAP sensors for oil fouling.  may have the intercooler blowing crud thru the throttle body into the intake.

any raw fuel smell or black smoke from the exhaust to indicate possibly leaking injector? are the fuel trims behaving until the point the issue begins?  i am assuming no knock issues since your tuners have not raised that possibility.

and of course, no codes?

any datalogs to share?
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

Offline ridered74

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Re: SHO low fuel pressure help
« Reply #2 on: September 24, 2021, 11:13:01 AM »
Maybe the fuel pressure sensor that is under the intake manifold? I've heard of a few people having to replace that. Don't remember what their symptoms were tho.
Gearhead E30 tune, Gearhead intercooler, LMS firestorm hpfp, catted downpipes, corsa catback, 160 degree thermostat, 3 bar map, upgraded AD trans mounts, MSD coils, Nitto 555R drag tires on front, AR924 wheels and BFG sport comp 2 summer tires on rear, and an EPP intake.

12.2479 @ 118.05 fastest trap
11.591 @ 114.89   fastest ET

Offline SHOdded

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Re: SHO low fuel pressure help
« Reply #3 on: October 03, 2021, 06:50:35 AM »
maybe a sticking wastegate or blowoff valve or even solenoid? usually see a loss of pressure rather than overboost, but you never know.  you said pressure held perfectly during the boost leak, so ...
2007 Ford Edge SEL, Powerstop F/R Brake Kit, TXT LED 6000K Lo & Hi Beams, W16W LED Reverse Bulbs, 3BSpec 2.5w Map Lights, 5W Cree rear dome lights, 5W Cree cargo light, DTBL LED Taillights

If tuned:  Take note of the strategy code as you return to stock (including 3 bar MAP to 2 bar MAP) -> take car in & get it serviced -> check strategy code when you get car back -> have tuner update your tune if the strategy code has changed -> reload tune -> ENJOY!

 

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