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2018 civic si fuel pressure issue

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May 24, 2023, 9:20 AM

Post #1 of 2 (1040 views)
2018 civic si fuel pressure issue Sign In

So my buddy blew his motor sent it off got a full rebuild with forged internals so we are ready to make some power.

While the car was gone he had them do a hpfp and LPFP and injectors. Now the car is back we get it on the dyno with a base map do a pull and get p0087 low pressure at the rail.

so we assume the issue is the pump or fuel regulator, after putting a new pump in 3 times a new factory pump, a dw300 and a hondata pump with a new regulator none worked and did the above in the video.

as you can see at about 4k rpm while doing a pull when the target and actual are 19k the target rises and the actual begins to drop. We even tried our original tune which ran great with factory motor and full prl turbo kit for 50k miles but now with the same setup just built motor and better fuel setup won’t work.

if anyone has any ideas I’m open to anything thank you for the help ahead of time.

2018 civic si 1.5t
50k miles on dash
1k actual on new motor
Full prl big turbo kit
Map performance quad tip exhaust and down pipe
Currently running the stock fuel pump
Bigger injectors don’t know the size off the top of my head
Skunk 2 intake manifold
I think he used this fuel kit I know he used that HPFP—

Link deleted ............ not allowed

This is the video link

(This post was edited by Hammer Time on May 24, 2023, 12:40 PM)

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 24, 2023, 12:39 PM

Post #2 of 2 (1028 views)
Re: 2018 civic si fuel pressure issue Sign In

You're not likely to get any help on that here.

The techs here don't deal with mods.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

(This post was edited by Hammer Time on May 24, 2023, 12:41 PM)


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