screw logging... you can easily log with an e-manage ultimate and tie the wideband into it.

I like the PLX Devices set up because their display can easily fit on the steering column; front and center.

 

Ah, glad to know they helped you out too. I'm thinking the FPR may have been damaged by the Nitrous Management Unit from my Zex dry kit? Oh well, at any rate, I already have my FPR and just need to install it... Hopefully next week.

 

mrsteve, or anyone that may know... does the ECU have any way of sensing how much fuel is actually flowing through the injectors once they are open. or does it just control the pulse width according to other factors?

 

My fuel pressure gradually dropped again. It went up to 30 psi after installing the new fuel pump, and is now currently at 27. I'd have to guess that if Steve's answer to the above question is "YES" then changing my FPR would be pointless, but we'll see... I have a feeling that the spring in my stock FPR is collapsing or if it's pressure, something may be clogging? I am not sure, we'll see.

 

your idle pressure seems too low, the HELMs has an acceptable range of something like 40-46 psi, so it looks like your FPR is not functioning right.

 

If pressure increases pulse width will decrease. So yes, pulse width is controlled based on various factors; fuel pressure being one of them.

 

Stock your fuel pressure with 20in/Hg should be 30psi

 

in what context?

helms says Pressure regulator with vacuum hose disconnected 47-54 psi, with the vacuum hose connected 40-46psi

 

That doesn't make sense.

 

Yeah, that's what it used to be when I first installed my FPR prior to using the nitrous. I really gotta change out my FPR and see what's happening and what may change.

Another thing I notice is that if I turn off the VSA and use the gate shifter and hold the revs till the redline and shift at the perfect moment, I sometimes get a CEL that clears momentarily after. My car also knocks when I start it up after it's warm. On cold starts, it starts up just fine.

I'll see if my AEM FPR fixes these issues. I've just been way to busy to get on this project.

 

flashing CEL at redline is typically misfires. have you checked your coil packs?

 

that's just what i'm reading in the helms.

 

Yes and no. It doesn't know the flow through the injectors, but measures the o2 content in the burnt gasses via the o2 sensors. the primary source of info are the o2 sensors, there are other contributing factors, but o2's do most of the work. fuel pressure will/should be constant no matter what, it is not controlled by the ecu, only vacuum on the fpr control fp. When it's on , it's on, and if there is more fp pressure than the motor needs, which is generally the case, it just returns it to the fuel tank.

 

Ihave my fuel preesure set @ 38# and still dialed it down on th dyno with the v-tech controller air/fuel was 13.9 most of the way till it hits 6000rpm then it jumps to 14.5 for some reason.

 

^You aren't boosted and thus adjusting your fuel pressure will do little to nothing for you due to short term and long term fuel trim adjustments. Increasing fuel pressure will result in the ECU reducing pulse width. Increasing fuel pressure with an adjustable FPR on a N/A car will do nothing but place more strain on your fuel system. Your motor still gets the same amount of fuel.