Adjustable Fpr

[Kansei240sx]

Hey, I recently went to take my 240sx into a dyno.

The few weeks before, i noticed my top end dissapeared, I stopped feeling that slight pull that i ussually felt when i got the header in from ~4900-6000 Rpms...Its just flat now..... So when i took my car into the dyno my graph looked like an earth quake.

I ended up with 128.6 Rwhp and 127.9 Tq [which is lower than it should be.... ]

From the sensors set up and all that jazz, i was running rich, and my spark is down....

Im thinking my spark could possibly be down, becuase..... ( The gasket that goes around the spark plugs leaked oil becuase i didnt put enough silicone around it. So oil leaked to spark plugs 1 and 4.

So my final thoughts are, If i get new spark plugs ( if needed ) should i get an Adjustable FPR or just get the stock one...

[:: orion ::]

Stock.

The stock ECU's fuel curve is not that bad, and the MAF compensates for more/less airflow...so lower fuel pressure throws thing out of whack.

Why do you think the one on the car is bad? Have you checked the fuel pressure?

- Brian

[Kansei240sx]

That what i am not sure about, How do you check the fuel pressure? and, i heard squezzing the return line on the FPR ( if it revs high then it needs to be replaced)

[:: orion ::]

You need a fuel pressure gauge...Summit Racing, or Jegs...either place will sell one for $20 or so.

They uses a barb fitting on each side...cut your fuel line right before it enters the rail, put the gauge there, see what it reads.

Specs are ~43.5psi with the vacuum line disconnected from the FPR, and approx. 34psi with the vac line connected, at idle.

If you squeze the line, it's not guaranteed to rev up...that's a bad method to test it.

- Brian

[skatanic28]

do you happen to have the dyno graph?the stock ecu maps are pretty generous with fuel at WOT, mine consistently went into the 12's when stock.