Insane railpressure spikes

Dennis 2ss · 07-12-2023, 01:51 AM

Hello everyone i have a wierd issue with my fuel pressure. It keeps spiking all over the place. Injector seems to work like they should but im not sure they will if i keep it like this though. Look at this pic with the pressure at a regular level:
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And then here is the INSANE fuel spikes

:

Something is way of here but i dont know what. It reaches around 95000 psi at most. And yes i have a high MS too. Anyone have an idea?

cjperformance · 07-12-2023, 07:42 AM

For starters, theres no way thats a valid reading. You blow your whole system apart if that 95k psi was real. It looks to me like an electrical gremlin.

Not sure how or where pressure is measured at the rail though.

Probably would need to see a whole log to tell more, but it may be something one of the other more experienced members will know off the top of their head... but my amateur brain goes right to intermittent short or open in a sensor somewhere.

If not that, some values (not saying necessarily this one) are calculated/inferred so could be a wacky value calculated by some other issue, thus the need for more log info.

cjperformance · 07-12-2023, 07:54 AM

Also are there any trouble codes? After a bit of looking seems like opens or shorts would set a trouble code.

KingLT1 · 07-12-2023, 08:20 AM

Pretty sure it's just a glitch with the software and your year of car. I have seen a couple other 17's do the same thing but not all of them.

Dennis 2ss · 07-12-2023, 09:16 AM

Quote:

Originally Posted by cjperformance

For starters, theres no way thats a valid reading. You blow your whole system apart if that 95k psi was real. It looks to me like an electrical gremlin.

Not sure how or where pressure is measured at the rail though.

Probably would need to see a whole log to tell more, but it may be something one of the other more experienced members will know off the top of their head... but my amateur brain goes right to intermittent short or open in a sensor somewhere.

If not that, some values (not saying necessarily this one) are calculated/inferred so could be a wacky value calculated by some other issue, thus the need for more log info.

I definitely agree on that lol. I actually laughed when I saw it at first, I mean 95k psi lol. And all I was thinking was that FIC injectors does not like rail pressure above 2500 psi

. Thanks for the help and I will logg more today I think. And try to blend til i get to 6.0 ms at least

Dennis 2ss · 07-12-2023, 09:21 AM

Quote:

Originally Posted by KingLT1

Pretty sure it's just a glitch with the software and your year of car. I have seen a couple other 17's do the same thing but not all of them.

Ok thanks king! Definitely still a big noob at this tuning stuff. Will read more from you guys in previous posts. It’s a goldmine.

Joshinator99 · 07-12-2023, 10:54 AM

Quote:

Originally Posted by KingLT1

Pretty sure it's just a glitch with the software and your year of car. I have seen a couple other 17's do the same thing but not all of them.

Agreed, my car does the same thing. Weird.

07-12-2023, 01:51 AM	#1
Dennis 2ss Drives: Camaro 2SS 2017 Join Date: Jan 2022 Location: Sweden Posts: 75	Insane railpressure spikes Hello everyone i have a wierd issue with my fuel pressure. It keeps spiking all over the place. Injector seems to work like they should but im not sure they will if i keep it like this though. Look at this pic with the pressure at a regular level: And then here is the INSANE fuel spikes : Something is way of here but i dont know what. It reaches around 95000 psi at most. And yes i have a high MS too. Anyone have an idea? __________________ 2SS A8 D1X Stage 2, 3.7 pulley, Kooks LT 2″, Borla XPIPE/ GPI drop ins,Caddy Racing Lifters, ATI Damper, LPE GT35 Cam 42%, LPE Big Bore, FIC 30% Injectors, Fore Twin intank pumps, Flexfuel, MM wild catchcan. 865 WHP 743 LB FT 2Forge 19" wheels daily, Forgestar D5 17" for track

07-12-2023, 07:42 AM	#2
cjperformance Drives: 2017 Camaro SS 50th Anniversary Join Date: Apr 2021 Location: Missouri Posts: 929	For starters, theres no way thats a valid reading. You blow your whole system apart if that 95k psi was real. It looks to me like an electrical gremlin. Not sure how or where pressure is measured at the rail though. Probably would need to see a whole log to tell more, but it may be something one of the other more experienced members will know off the top of their head... but my amateur brain goes right to intermittent short or open in a sensor somewhere. If not that, some values (not saying necessarily this one) are calculated/inferred so could be a wacky value calculated by some other issue, thus the need for more log info. __________________ 2017 50th Anniversary Edition \| P1X Stage 2 DSX Aux Low Side \| LT4 high side \| Flex Fuel TooHighPsi Port Injection (installed & tuning) CircleD 3K Stall \| QA1 CF Driveshaft Forgestar F14 Drag 17x10 NT555R2 305/45/17 Rear Forgestar F14 18x8 NT555G2 235/50/18 Front 10.84@131 w/4.13" pulley ??.??@??? w/3.7" pulley (installed & tuning)

07-12-2023, 07:54 AM	#3
cjperformance Drives: 2017 Camaro SS 50th Anniversary Join Date: Apr 2021 Location: Missouri Posts: 929	Also are there any trouble codes? After a bit of looking seems like opens or shorts would set a trouble code. __________________ 2017 50th Anniversary Edition \| P1X Stage 2 DSX Aux Low Side \| LT4 high side \| Flex Fuel TooHighPsi Port Injection (installed & tuning) CircleD 3K Stall \| QA1 CF Driveshaft Forgestar F14 Drag 17x10 NT555R2 305/45/17 Rear Forgestar F14 18x8 NT555G2 235/50/18 Front 10.84@131 w/4.13" pulley ??.??@??? w/3.7" pulley (installed & tuning)

07-12-2023, 08:20 AM	#4
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 6,801	Pretty sure it's just a glitch with the software and your year of car. I have seen a couple other 17's do the same thing but not all of them. __________________ 2016 NFG 1SS A8 Options-2SS Leather/NPP Perf. mods-Whipple 2.9/Fuel System/Flex Fuel/103mm TB/Rotofab Big Gulp/Cat Deletes/Corsa NPP Per. times- 10.5 @ 137 w/ 1.8 60ft Full weight on 20's 1200DA

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