Brian3676

Hello...thanks for the post. Been looking for write-ups, reviews and pics on fueling upgrades. I am currently in the middle of a ID top feed conversion. I thank you for the link to the dorman connectors, that's the last bit I need to finish my install...

 

Depending on how your running the top feed fuel lines you may actually be better off getting an aftermarket regulator. You can use the one I posted with no issues, but if using the AN ID fuel lines, something like the aeromotive regulator with AN fittings may be nice.

 

Just a thought. Glad people are still trying this fix out. The guy who now has my old car with this set up loves it as well.

Yeah, I spent a lot of time trying to figure out my issue and finally found the regulator issue. Posted it up hoping it could help others too. Unfortunately I only drove on it for a few weeks before I totaled my car, but hopefully it's a long term fix for some!

Really sorry to hear that, man!

 

I tell you what - if your car's replacement can use one of these intercoolers, I'll honor the group buy price for you anytime. Just shoot me an email (mbeenen@grimmspeed.com) and remind me.

 

Matt Beenen

Engineering

 

This type of customer service is why I had pretty much every Grimmspeed part they make for a Legacy on my car. I'll keep it in mind, and thank you again!

Wait for a year for it to come out....comes out one week after I total my car:spin:

I played with the duty cycles. The regulator cant bypass enough fuel at low load driving with the pump at 100%, my fuel pressure is pretty high like that. I talked to DW and they said there pumps are completely fine with the duty cycles as long as its a minimum of 7v if I member correctly.

 

My STI regulator is still working just as I had hoped

^ that is true, however the Cobb kit is also for the 08+ sti that has the fuel comp tables.

I have not thus far. Most who do mess with the tune, have 07+ STI/WRX/LGT where they added a fuel comp table, and they adjust or 0 that out. In 05/06 we dont have that.

Nice to hear! I was planning on making a bracket as well, but wanted to make sure it worked right first, and have not gotten around to the bracket part now haha.

I posted pics in the orignal post with #'s, but this is the link

 

[ame=http://www.amazon.com/Dorman-800-120-Fuel-Connector/dp/B000CIT1C8]Amazon.com: Dorman 800-120 Fuel Connector: Automotive[/ame]

 

I honestly have been crazy busy, I have not had time to get my laptop and hook it up to do a log. I have my accessport in the car and have a few gauges open, as well as I keep an eye on my wideband. From what I can tell, everything is perfect thus far. My AF learning has never got +- more than a few %, my wideband reads perfect through my entire RPM and boost range.

Interestingly really only my A was high, others were within the +-5% range.

 

Not saying its your BOV recirc line, just trying to give an example.

Have you actually smoke tested the car? I had AF learning that was pretty high, around 10-11%, I boost leak checked the car 10 times trying to find leaks but never could find it. I ended up having a tiny tear in my BOV return line that we were finally able to find with smoke. Its amazing how small of a leak will create a 10% AFL.

Yes the car will still fire that plug. If your dumping gas in (aka stuck open injector) your oil will smell like gas usually. If this is the case, careful you dont wash the cylinder walls or your gonna be replacing the engine. You can also try swapping injectors while your in there looking at the coil. There not too hard to swap.

Lol stupid me got my cylinders mixed up.. The injector is not spraying at all.. I pulled it at idle and nothing.. so how I got cylinder 3 and 2 mixed up is beyond me lol

I have not read through this thread, but are you sure you have spark in the cylinder? Pulling the injector is a classic trick to see if the cylinder is working, but after finding that its not, you still need to figure out spark, or fuel

I can do a log. I don't have a old one showing with the stock regulator though. It dident move the stumble, it just reduced it greatly. Also somethin to consider, this was with my mods, and my tune. It could be different with stock injectors or other mods.

Are you happy with the quality of the Dorman fittings?

 

They seem to work well so far. No leaks, seem well built. I did order a 5th one just as a spare because I dident know, but after getting them and installing, I am not worried at all.

 

Car is still doing well, AF learning does not swing more than +- 1.56%

So far still good. Its defiantly better and less noticeable. I tried zeroing the load tables as the STI people suggest, but it kinda seemed to mess with things so I put them back to the original tune. I will do a log and send it to Cryo since he did my tune and make sure everything still looks good.

I have been working on figuring out my fueling issue for a long time (pressure fluctuation). Also hoping to fix that little stumble everyone talks about, but it was not my goal of everything. I have replaced everything. As for mods, I have a built motor internally, FMIC, 18G turbo, Grimmspeed downpipe, up pipe and boost control solenoid.

 

More importantly since this is a fueling issue is the fueling mods:

DW 65C fuel pump

DW 740cc injectors

New OEM in tank fuel filter

Replaced fuel pump and filter O rings twice just to be sure they were good

Had injectors cleaned and tested by DW, passed perfectly

 

I replaced my fuel pressure regulator with a new LGT one from Subaru thinking that was my cause of the fuel pressure fluctuation. Dident help.

 

I came down to the 1 year old DW fuel pump being faulty and started talking to DW. I read and asked them about something I found online saying when you have fueling mods, especially with there DW pumps that they do not like the bypass style regulator that our LGT's and the 08+STI have. I figured I would try one last thing, and found most people with 08+STI replace there regulator with a standard style one, like Automotive, Tomei, or a older gen regulator off a 07 and older STI. Perrin just came out with a nice regulator but they want $300. I got some quick connects from Amazon, and a STI regulator from Subaru and fuel injection hose from Napa. Installed it all like the Cobb Tuning kit is set up, but they want $290 for their kit found here, and I made this for $140. Not only has it fixed my fuel pressure fluctuation, but the stumble that everyone talks about is completely gone. The car accelerates smoother under WOT, the car drives nicer just going with the flow of traffic and using light throttle, all over better.

 

Anyone else ever tried this?

Thinking I will sell the fmic and try this unit out.

Not yet, it's such a pita to get the right PVC adapters for this. I probably should though before digging into injectors. If I do new injectors I plan on doing an inline fuel filter right before hand, so that new ones don't get clogged...

 

To pressurize the entire system, I just connected it to the inlet and did a few psi so I dident blow any seals. Then to test the rest of the system I connected it to to my fmic piping and did 25 psi. His avoids having to hassle with the PCV crap and capping it.

Have you done a boost leak test yet to make sure there are no other leaks?

If the list ever gets to me I'm down for one!

+1 for the Recaro. Its what I have for my daughter. Its a great seat. Fits nice, easy to use/install whether using the LATCH or standard seat belt install. My daughter is comfy in it as well. As stupid as it sounds I have to take a writing class for my Engineering degree, and I choose to write about car seats and how they are made/what ones are better and why bla bla bla. If you dig deep, Recaro really is one of the top highest rated seats out there.

I have a 06, so no air pump, but if I understand you I can get rid of the PCV hose that goes to the inlet and just run the part that goes from block to intake mani?

If you go all the way to tearing the block down and honing the cylinders why skip on the $120 bearings?

Skip the 11mm oil pump, if yours is bad just replace it with a stock 10mm one. Lots of write ups why, look for some on nasioc by KillerB