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I have done alot of searching and tryed to fix this myself, but i cant seem to find anyone with the setup i have and actually have the right info posted to answer my questions. so here goes. have had the turbo on a week now...


I am boosting 5.2psi and run pretty rich at full boost around 50% throttle (10-11 afr), using a PCS XFC (no dyno, just simple tune from chris at bnc). but no matter what i change my MAF/MAP maps to alter fuel, at WOT and close to it, i always lean out into the 13-14 range.

I have rsx injectors and a walbro in the tank. stock rail and regulator.

Im thinking i dont have enough fuel pressure and need to convert to a return system and an adjustable regulator, but it seems there are plenty of people on here that either have more pressure (stock everything else, including injectors and regulator), or just rsx injectors (and the rest stock) and everything works fine at low boost around 5psi... what else could i be doing wrong? and why arent i getting enough pressure to boost this low with the rsx's using the walbro? i know the stock regulator only lets you get 42.5psi and no more, but tell me some secret thats lettin others go higher usng stock setup? unless i dont need to go over that psi??

i have srt-4 injectors in the mail to me this week, but i think thats not going to fix my problem, obviously if it IS the fuel pressure... as i wouldnt think the rsx's are maxing out at 5psi..


heres a whole new thing now, that might be caused by all this, but still new, but to throw some more info out there... im also throwing a CEL now that is telling me low voltage on my prim o2 and the ecu cuts the fuel real bad, and i cant get above 16 afr at all (not boosted). i have to pull over and pull battery for a few minutes just so i can get home (cel comes back on after 5min or so, sometimes more, sometimes less). this cel stuff is all new though. didnt happen at first, very strange. i would think if im running lean, it would add fuel, not take more away??

i also thought low voltage on the prim o2 was caused by rich mixtures... i never run rich unless i got into boost, (stays fluxuating around 14.7 like normal) and the cel still comes on, even after having battery disconnected for 24+ hours...

when im sitting idle, sometimes it leans out to 19+.... sometimes it stays in 14-15... its never the same, so i dont know where to point my finger.


im using an aem eugo wideband for refference.


and suggestions, tests, would be of help

Thanks in advance guys.

 
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Without knowing the ins and outs of PCS, can you read the injector duty percentage in the software? Tons of people use RSX injectors with a stock pump and have no problem running 8 PSI.
If you're sure that the rail is actually getting a full 43 psi of pressure, and you're sure you got 310 cc injectors and not the 270s (although they should be fine to 6 or 7).
A problem like this arose in edwins car, turned out that the walbro wasnt actually pushing all the gas it should have because the line in the tank was kinked. I'd just start fiddling around until you find the problem, but I'd say its pump/supply related.

 
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Thanks for quick reply boiler.

supposedly they were the type s, but yes, even base model should hold 6-7psi....

i just redid the fuel line in tank with the walbro, so i know its not a kink.

and trust me, boy have i fiddled like the d@mm piped piper....

 
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and no, it doesnt show duty cycle on injectors liek the emanage...

but. i do have a AVC-R boost controller (not hooked up to vac lines to control boost until i get my probs aside..) but if someone knew which wire on the ecu to hook up the injector duty cycle monitor (apexi sucks with real directions, espec 7thgen's), then im sure i could get that working to tell... i had it hooked up to what i thought was the right one, but it wasnt... stayed at 50% all the time.. i was thinkin of hookin it up to one of the injector outs on the ecu, but i thought the resistance the unit would cause might fubar up the pulse voltage the ecu was sending the injectors.... any input on that?

 
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i also have a question about the FPR. is it located in the tank as well? when i ripped all the hoses apart in there and reconnected the pump using a rubber fuel hose, i didnt do anything to the, what i think is the stock fpr, hose. it looks lek the bottom of it isnt hooked up to the hose though... i dunno im confused on that.... so on that note. im going to go pull it back out and take a pic, and maybe you can tell me if theres a prob with it. brb

 
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ok, heres the pics. in one of them the hose looks kinked, but its not. keep an eye on the lower of the housing as thats where the hose doesnt connect to anything anymore, im not sure if thats an issue or not...

 
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so what is the point of the thing on the outide, im assuming thats the regulator right? its all done (fuel pressure regulation) in the housing up top and the excess gas stays in the tank, minimizing on fuel line that goes to the rail itself.. the bottom feed thats not connected to anything down there id assume is where the excess fuel gets poured out of, so it doesnt really matter if its connected or not, right?

 
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ok, so now im answering my own questions. i see the spring in the regulator...

so it looks like my setup here in-tank is right?> whch means im prob getting the 43psi. so why arent my rsx's werking?? lol..........


and whats the u ring around the regulator with the ground wire used for?

 
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bump for some helps please =D

 
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Your pump set-up is fine, what turbo are you running? I would lean out at 5 psi with RSX-S injectors on my GT30. I'm also running the PCS-XFC. Those little guys just couldn't throw enough fuel. From what it sounds like, you're having the same problem - the injectors just can't hang.

As far as the u-ring and ground wire on the FPR, I have no idea.

 
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Why did you change the hose to a rubber one? You may want to invest in a Submersible fuel hose. Look HERE . Standard fuel hose will eventually blister on its exterior and could cause a problem.

 
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mm yummy that hose looks nice, ima get me some of that...

im running a T3/T04E, so maybe thats the issue..

i got 4 new stage 1 srt-4's coming in prob on monday, im hoping for friday though... well see then. i saw in your thread you went to a return fuel system though.. so obviously your running more pressure? i didnt see a FPR on your turbo buy-list though?

if i buy the SS fuel lines, are they easy to crimp the fittings on? where should i get me some lines and fittings? i was going to get the SLP fuel rail, just easier than finding a local braizer and get it done right...

 
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got a new map from chris today and its running a little better, but still 19's on idle (700rpm).. threw a CEL after about 5min of vac driving and doing normal logs, no pulls. getting closer, but not there yet...

 
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Naw. No return system yet. I still have to buy the rising rate FPR. With all the repairs that I've got stacked in front of me, it's not a priority. My fuel system is the one thing that does work right so I'm not going to mess with it just yet.

SS lines are a bitch to put fittings on. I'm sure they make some whiz-bang tool that makes it 8 times easier, but I don't have one. That being said, as long as you use a thin cutting disc and tape up your cut point, it's not so bad to get them on.

What CEL did you throw? P1106 baro pressure one? It's my favorite. I get it every 3-4 days now. As soon as I swap to the new head I'm going to call and give Chris a ration of **** for not answering my emails. I did in fact pay him for the tuning he's supposed to be doing. No point in doing it now though since the car isn't tunable in its current state.

 
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here is an easy way to do SS lines



http://www.koultools.com/

 
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i just bought a obd2 iso reader to usb interface so i can monitor the trims on my fuel and tune better... but for now i dont have access to the old scanner i had... so i dont know for sure for sure what cel im throwin on the new map chris sent, but im sure its the same (low voltage on prim o2 sensor) and its cutting my fuel out bad...

what pressure are you running at clint? are you still using the stock FPR? im gonna have to change my maps when i install the srt's obviously, but maybe if your running at stock pressure, thats all ll need for now and not have to **** with the return system yet.... i dont have the money anymore to be doin all that right now, in essence...

 
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tfnaaf, is that a crimper?

 
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its a tool that makes it easy to assemble the hose and fitting. they aren't a crimp fitting. Im using a RRFPR but only for adjustment of the base fuel pressure. I dont have a vacuum line/boost reference line hooked to mine and tuned it with set 44psi

 
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i should be able to boost 5.2psi on my stock pressure, i would think, but hearing clint say the rsx's wouldnt keep up with his gt30 on the same boost says its possible with my t3/t04e as well... he upgraded to srt's and is ok now, so im hoping that will fix my probs too. ill upgrade to return system when i go up in boost. i dont plan on going anymore than 8 until i do internals anyway. i got an avc-r, but its not hooked up right now. i got a 2psi spring from clint a little while ago and plan on using it in conjunction with the avc-r, boosting 2psi when i just drivin normal and stuff and 5ish when im havin fun, and then use the 8 max when im racing or at the track. just need to have a system setup under the hood that will support all the way up to my 8psi as far as fuel goes.

 
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i was driving today for about 30min with no CEL light to go to the asian market to pick up some stuff for dinner. its all highway, so at 60-70 my afr stayed around 14.7 pretty nicely. after the car sat outside of the market for 20min and i left, drove for about 5min and the cel came on again.. this was in stop and go traffic for 5min. this time the cel is tellin me im running lean i suppose, as now its adding fuel. i drove the rest of the way home at a non-fluxuating afr of 12-13. interesting. almost liek it cuts of the trims and just stays at like +15% all the time. funny part is it still idles at 17-19.... and before the cel it was actually idling at 14.7 steady after sittin for about 15 or so secs.. even with the high adding of fuel, 60% or higher throttle leans out bad in boost.

 
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Stock pressure works fine for me at 9 psi, was even fine at that 10-11 spikes when I was dialing in the boost controller. I imagine we don't really need a return system until playing in the 12+ psi range.

My guess is still the injectors. It may have something to do with the PCS and the way it deals with the RSX-S injectors. I know some folks were running them at 5.5 psi on an emangle setup without any issues, but for some reason the PCS doesn't like to run with them. IDK. Mine were fine all the way to redline at 5psi on WOT, I just couldn't go any higher than that.

 
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your rsx's? even at low rpm, if i wot it, it leans out instantly. even going 120mph+ i cant do more than like 60% throttle or it leans out

 
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also, quick question...

why would my tach on my main dash be speratic? as in, sometimes its fine, but sometimes it just dies to 0.... mostly when i stop, itll be fine then poof, drops. then comes back up... very wierd. sometimes stays down for a few minutes, even on interstate... when i have the xfc hooked up, tach stays right all the time....

 
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what is a way i can get a gauge inside the cockpit to show my fuel pressure without having to run a fuel line to the gauge? do they make such a guage with a remote sensor?

 
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The only way to do that is if you brake, they'll fly right by, Maverick.

OK one issue at a time. When you WOT at low RPMs, PCS sees the TPS voltage jump, engine load is still high (running in vac) so it says to the injectors "Give her all she's got Scotty!" The injectors respond with, "We're givin her all we've got Cap'n, but the dilithium crystals just can't take anymore". Now the scary part is my Firefox dictionary knew how to spell diliithium...

All that being said, it could be that the PCS is asking too much of the injectors, and since it's a piggyback, they crap out. Try tweaking your MAF (which is actually TPS) vs RPM settings. Can you post a screenshot of the MAF vs. RPM table from the map you're running?

Tach question. Not sure I understand this. Normal bombin around driving with no laptop and just the PCS doing what it does, your tach signal is flaky. But when you hook up a laptop and run the PCS gauge display, it's rock solid. Am I getting this right?

In ref to the fuel pressure bit, I'm sure they make electric FP gauges that work off a sending unit. Hell I would think an oil pressure sending unit hooked up to a fuel line and oil pressure gauge would work. A pressure gauge is a pressure gauge right?

 
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yeah thats what i was thinkin abotu the pressure gauge to bro, lol. just wanted to see if it was poss with fuel too for sure.

About the tach, yes thats correct, as you stated.

ill send you my map and you can take a look at it. ill send it when i send that shot of the bov ****. check your yahoo in a min.

and watch out for those clingons cap'n. we are approaching uranus