pushing WRX 440cc's to the limit

[yellerandahalf]

wow, at 120psi the injectors will theorietically feed at 820 cc/min! that's pretty good!
I'm not comfortable running that high pressure, though:-( that's crazy! Anyways, that's a pretty good number. perhaps at like 100psi (about 750cc/min) they would be good.
-Mateo

 

[yellerandahalf]

new info! our fuel rail can take up to 100psi without problems, but it's not recommended to run it there for very long. so i like about 75psi. at that pressure, the injectors will flow at 650cc/min. that's pretty close to what I need. cool beans! Time to install that stuff.
-Mateo

 

[igdrasil]

Well, at first the problems I had running that much pressure was fuel hoses popping out the fuel rail, solution was tightening it harder, deeper in both intake an return fittings with 2 clamps.

But after a long period, the pulsation damper expelled the screw inside...which I didnt care much, its work is to keep fuel pulsations out the rail.

I was actually running higher than 120psi (I had the MSD HP Pump right before the fuel rail), but my fuel pressure gauge could not show, it was from 0 to 100psi and at high boost I could make it do 2 turns in the gauge, so past 100psi is not accurate.

 

[yellerandahalf]

holy friggin moly! that's a LOT of pressure!!!!
-mateo

 

[Rainman]

your MS has extra injector driver doesn't it?
consider a secondaries rail.

Recently, a friend blew his FS-DE. I was thinking about scavenging the fuel rail so that I could build a secondary boost-regulated rail.

R

 

[wicked]

Recently, a friend blew his FS-DE. I was thinking about scavenging the fuel rail so that I could build a secondary boost-regulated rail.

R

now that IMO would be the way to go.
tuning in secondaries is a lot easier then trying to run insane fuel presure.I am running my stockers,and 2 440's,it's enough to cover 15 psi with no problem.

 

[Rainman]

now that IMO would be the way to go.
tuning in secondaries is a lot easier then trying to run insane fuel presure.I am running my stockers,and 2 440's,it's enough to cover 15 psi with no problem.

This seems true to me. Stock rail, stock injectors, pressure/boost-regulated actuator. It seems the easiest of all the setups to tune. Of course, I am saying this without having done it yet so I reserve judgement until this has been done. However, the idea of just doubling what is there sounds more straightforward than adding on things that are completely foreign to the system. Just my $0.02.

R

 

[yellerandahalf]

yes, it sounds simple. setting it up to run when you want it to, and tune your pulsewidths, would not be. I'm not doing it because megasquirt doesn't have the support for it. That's all.
-mateo

 

[wicked]

my buddy is running secondaries on his MS powered volvo.

 

[yellerandahalf]

really? very interesting. is he using the MS to run just the secondaries, with the stock computer controlling the primaries? Cause when i was thinking about it before, i saw that as possible.
-Mateo

 

[wicked]

no,he is running 440 primaries,and 2 440 secondaries.his is the newer MS btw.

 

[Rainman]

really? very interesting. is he using the MS to run just the secondaries, with the stock computer controlling the primaries? Cause when i was thinking about it before, i saw that as possible.
-Mateo

This seems very workable and probably the easiest way to do this.

R

 

[yellerandahalf]

no,he is running 440 primaries,and 2 440 secondaries.his is the newer MS btw.

ohhh, i forgot about v3. it's got lots more functionality, that I'm not going to play around with (since i don't feel like upgrading). Sorry I doubted you.
-Mateo

 

[Judo]

hope you aren't talking bout my engine rainman, I got plans for that thing