Fuel Pressure

[petersonb]

Wait...was that supposed to say "Actual" pressure?

Yeah, that's what I call it. Its the pressure that's actually at the rail, caused by the fuel pump.

Others may call it something else.

Sent from my phone

 

[petersonb]

Is this drop to 32psi normal?

Thanks

I think it's fine.

This was my frp (remember, delta P) versus my throttle position. The scale is set to show frp in psi. Blue is frp, red is throttle position.

This datalog was with a BAD FUEL PUMP

Now here's a log of a 3rd gear WOT pull (30-95mph), again with frp in blue and throttle position in red. Note the drop to about 29psi right as I stomp on the throttle.

This datalog was with a GOOD FUEL PUMP

I'd say your drop to 32psi is normal, as long as it isn't sustained, especially if you're na, that would mean your fuel pressure would be close to 32psi also (n/a cars are low vacuum when WOT). When my pump was bad, pressure would drop down to 25psi frp (which, at 10psi boost at the time, is like 15psi fuel pressure..... definitely a bad pump!!)

 

[mcstang]

Well you chaps have certainly lost me
For the first time ever I managed to data log and look at the shit on this computers screen-all lines and graphs and stuff.
I need to master how to save the log as an attachment so you chaps can take a look at it.
I just have a horrible bogging;
Changed;
Fuel Filter
Oil & Filter
Plugs
Throttle Body
Cleaned MAF
Cleaned CAI (C&L)
She seems alot better at highway speeds and kick down is ok.
I also have custom tunes from Doug (C&L, formerly BAMA) and they just choke the car.
Put his performance tune in yesterday and was cruising on a flat road at 30mph at 3000 bloody revs.
Even when the car is running really shit I have no engine light and no codes stored.
Thanks for all your help so far.

 

[petersonb]

Well you chaps have certainly lost me
For the first time ever I managed to data log and look at the shit on this computers screen-all lines and graphs and stuff.
I need to master how to save the log as an attachment so you chaps can take a look at it.
I just have a horrible bogging;
Changed;
Fuel Filter
Oil & Filter
Plugs
Throttle Body
Cleaned MAF
Cleaned CAI (C&L)
She seems alot better at highway speeds and kick down is ok.
I also have custom tunes from Doug (C&L, formerly BAMA) and they just choke the car.
Put his performance tune in yesterday and was cruising on a flat road at 30mph at 3000 bloody revs.
Even when the car is running really shit I have no engine light and no codes stored.
Thanks for all your help so far.

Yeah, definitely some learning curve to data logging!

Post it up once you've got it; you'll get your solution quickly from the guys here.

Sent from my ipad mini