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-   -   hpfp oscillating (https://www.n54tech.com/forums/showthread.php?t=58904)

Stoolz 07-23-2019 09:40 PM

hpfp oscillating
1 Attachment(s)
Hi brains trust.

Anyone know why my hpfp is oscillating like crazy?
It's not lpfp. I have them powered up direct and enough lp for 1000whp. Its not the fuel lines either they are all new, as is the hpfp.
As you can see afr follows it.
Don't know why the ECU would be doing this if that's the case.
My car has had an issue for YEARS now, might be tracking it down now I hope.


Payam @ BMS 07-24-2019 10:12 AM

Got the CSV ?

Stoolz 07-24-2019 12:51 PM

3 Attachment(s)

There is no JB4 on the car at the moment because we pulled it back to stock for fault finding.
Logs are done with MHD and I believe it's the S2+ map.
Unusually Oil pressure seems to fluctuate as well.
I think the hpfp and oil pump are both mechanically driven from the same chain so that may be a lead??


Stoolz 07-25-2019 02:44 PM

Anybody on here ever see this crazy kind of thing?
Back story, my car had a huge misfire , more of a "let go" any tune even stock.
Pulled everything out and had a damage tmap ground for some reason. Grounded it locally but same issue.
Since then I have replaced
almost every sensor.
fuel lines and regulator/filters
the dct box.
The engine, it's now 235 long motor
Something fishy going on.
Doesn't seem like the oscillation is mechanical.
Someone save me.

Stoolz 07-29-2019 02:22 AM

Bump. Help me Oprah Winfrey, Help me Tom Cruise.

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