hey guys,

i adjusted my fuel pressure with my fp regulator but now i want to put it back to factory because i just putt a v-afc in and i want to adjust my fuel maps with that.

so if anyone could help me out and knows the factory fuel pressure on a 95 h22a1 it would be greatly apreciated

 

So you know that the factory pressure regulator adjust itself constantly to maximize efficience of the engine and aftermarket regulators have a constant user defined flow of fuel/gas. I ask that becuase it seems better to have the after market regulator on if you're going to have the VAFC installed.

 

Stock pressure with the vacuum line disconnected should read like 40psi (If I remember correctly)
Brian

 

Really so with that done a constant supply of gas be injected. Interesting.

 

Yep; I believe that was one of Brady's mods on the old hondaprelude.com. Doesn't that give you the max fuel pressure from the stock pump?

 

Right, if you disconnect the vacuum line to the intake manifold, the FPR will run the max pressure it can........which for a stock FPR is like 40 psi......under full vacuum (idle) the stock FPR will usually run like 34-36 psi, and as you get on the throttle it'll start running more pressure (as there is less vacuum) up to full throttle (0 vacuum).......
Both the stock and aftermarket (or modified stock via B&M etc) FPR's behave this way.....on an adjustable FPR the only thing you're changing is the base pressure, it'll still make the same 4-6 psi adjustment based on amount of vacuum if it's hooked to the intake manifold......I haven't ever encountered any FPR's that actually let you adjust the range of psi change based on changes in vacuum, but they may very well exist (it would actually be cool if they did).....

As for Brady's "free mod" of leaving off that vacuum line to run max FPR pressure all the time, I don't think it's a very good idea considering our cars run rich already on the stock fuel maps.....however for dry nitrous setups and ghetto-fuel-management FI setups it might be ok....

Brian

 

Firedrake..... good info obviously your knowledgable glad to have you.

 

Brady's mod is crap. It just mean you run richer at low load. Your fuel will be unchanged at WOT.

The whole point of an FPR is to keep the pressure differential on both side of the injector the same. Injecting into a vacuum is easier than injecting into manifold with atmospheric pressure. So the fpr lowers the fuel pressure while vacuum is present and raises it as load increases. This insures that the same pulse width on the injector at low load will inject the same amount of fuel as at high load, or little to no vacuum.

I'm pretty sure you already know about them, but for some reason it didn't connect. It's called a rising rate fuel pressure regulator. Vortech, Cartech... What's used on ghetto FI setups to push more fuel in the engine based on load by raising fuel pressure at greater than a 1:1 ratio.

 

Hey

thanks alot guys i really apreciate it. all ur info really helped me out

 

Nope, didn't connect Then again, it was early and I hadn't had my coffee yet...... I've actually never used a rising rate regulator on any setup I've ever done......they've all been either VAFC hack/AEM/Hondata with bigger injectors....
Brian