[Fullsend1320]

New to the forum was just trying to find some advise I have a 2014 cts-v built. Car runs great during normal driving and WOT but if I Rev it or drift it, it will throw a low fuel pressure code I checked the fuel pressure at ideal off the fuel rail and have 84 psi at idle which is plunty and the demand is set to 70psi. Cars been tuned by Justin white. Mods include American racing headers, corsa Exhaust, wideband gauge AEM, 8 gallon trunk tank with track bypass, dw tank pumps, dsx aux fuel pump with Hobbs switch, dsx e85 sensor, secondary fuel filter, upper and lower supercharger spacers, reinforced brick in supercharger,arp head studs, 2.35 upper pully, aftermarket balancer with 9.17 lower ring, dsx idler relocation bracket and pully, ported and polished heads by landspeed, ported and polished supercharger and snout, 102 throttle body, ddp cold air intake with scoop, 1200 injectors, che trunion upgrade, melling high volume oil pump, btr stage 3 torque cam with all needed upgrades, upgraded valves, custom catch cam with welded bungs on valve covers, dss 1 piece aluminum driveshaft, dss 1500 hp rated axles,trz solid bushings in rear suspension then the rest just cosmetics. Any advise would be much appreciated.

 

[Blown376]

👋
I have a question. What's a lower SC spacer? I've heard of one between the SC and the lid only.

About the low pressure, have you double checked the sensor connection?

 

[PGA2B]

👋
I have a question. What's a lower SC spacer? I've heard of one between the SC and the lid only.

About the low pressure, have you double checked the sensor connection?

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Fasterproms is now offering Thermal Reduction Plates to reduce heat transfer caused by the supercharger sitting directly on the cylinder heads. The supercharger being in direct contact with the cylinder heads reduces thermal efficiency and heat is always the demon in positive displacement...

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[Jim]

Doesn't help with your problem but you should ask Justin to adjust your FPCM to bring your idle fuel pressure back to 50psi.

Are you logging when you get the code and if so, what is the pressure when it throws the code?

I could see it possibly being an issue if you're drifting with a low level of fuel but not sure why it would do it just while your revving it.

Kinda sounds like some FPCM tuning is needed.

 

[random84]

Without seeing a log for WOT fuel pressure, it's probably just a CEL code from having a relay for the 2nd pump. If you have a relay?

Just a matter of turning off that CEL via the FPCM.

Obviously, you'll want to make sure you have solid rail pressure during a pull.



Sent from my SM-G991U1 using Tapatalk

 

[RocketSled]

not sure why it would do it just while your revving it.

If it does it while drifting, it's doing it at high RPM in both cases. But with no load, high RPM doesn't demand much in the way of fuel. So it doesn't seem like a starvation kind of issue. I'd vote for maybe a bad pressure sensor.

When I supercharged my 02Z06, I wanted to add a fuel pressure gauge. I made an AN4 to 3/8NPT adapter so I could screw the sensor on to the end of the fuel rail. I just removed the Schrader and attached my adapter and sensor. Worked great. Except the sensor didn't like the vibration. After maybe 10K miles of driving it started acting flakey, and engine RPM was the factor that effected it. I bought a new sensor and a short braided sleeved fuel line with AN4s at both end and connected the sensor through that line with the sensor mounted on the frame and not the engine. That sensor is still working almost 90K miles later.

 

[Blades1_99]

In for videos of you drifting.

 

[Nighthawk111]

Fuel filter? Sounds like a flow issue if you deplete the line pressure at high volume and it has to build back up.

 

[RocketSled]

But just revving the motor wouldn't put the same demand on the pump. And the fuel in the tank isn't sloshing around. Yet it still happens. So it's not load dependent. So it's probably not a flow issue. But revving and drifting have one thing in common: high RPM. That's why I'm thinking it's a vibration-related issue. And the quickest/cheapest "blind" fix for that is to replace the sender.