Deatcshwerk 555's Side Feed Injectors
Emanage Ultimate
AEM FRP

This is by NO MEANS a site bashing Deatcshwerks !!!

Im trying to figure out a problem here. It seems like the injectors are dumping too much fuel even if Im pulling fuel with the EU. I took my TB off today and I have a gas/oil mixture laying in the intake manifold and the smell of gas coming out of the IM is very strong even though my A/F ratios are pretty decent all the time.

Im going rich after shifts and if I take my foot off the gas and go back on it goes rich for a little then goes back to stioch.

Another thing I dont understand is guys that are running 555's without any type of fuel manigment and arent going through injectors ?? When I first put in the motor, i went through 2 sets of plugs before I scaled the injectors and got the car running. How are you guys getting it to start and not wet sets and sets of injectors.

EDIT:

Just went out and pulled the front three plugs and was expecting wet and they were wet. I really need to figure out what Im gonna do here. Im lost

Lets get a discussion here.

-matt

 

How are the seals on the injectors? Are you getting them seated correctly? If the seals are bad or you don't have it in all of the way fuel will just leak right past the injector(s) and can cause that or can even cause the engine to hydrlock (been there done that... never want to do again )

 

All of the seals on the injectors are Brand NEW Nissan O-Rings. I dont think it is that cause the car still idles fine with a good a/f and its not bogging or anything. It definetly runs smooth

-matt

 

I have no idea how much boost you are running or where you run, but why are you using 555cc injectors? Sounds to me like you're taking things too far out of spec ratio. I think stepping your injectors down to a more modest 400ish and raising your fuel pressure to compensate with a use of a afpr might help your situation IMHO.

 

Im running 2.87" pulley with a 3" Charge Pipe and 3" Full Exhaust. On a cold night I expect to see about 14-15 psi. At 11-12psi on my old setup, I was at the tail-end of my 370's. I dont think the 555's are too big at all.

 

Are you running a Z32 MAF with your new dek motor?
What is the base fuel pressure set at with the vacuum source plugged into the fpr?
Don't know about the EU, but it should idle fine with Z32MAF+550's and the EU pulling a little fuel at idle.
There shouldn't be any fuel smell either...unless they are leaking from somewhere.

 

Yea Z32 is on this motor as well.
Right now Im at 34 psi at idle with vaccum hooked up.
I cant really tell if Im leaking. The thing idles great and a/f shows fine. It is rich at start up cold which is normal and when I let off the throttle and when I go to get back onto throttle.

Im really confused since so many guys are running 555's without a problem. My oil even smells kinda like gas.

 

Oil + gas is not good for your bearings, I'd change your oil asap. You must be dumping in so much fuel that its getting past the piston rings. How do the pintle caps look on the injectors? The need to be in perfect condition so that the lower o-ring has something to push back against the fuel pressure. Mine were damaged on my stock injectors and it prevented the lower o-ring from doing its job. Whenever fuel ran through the fuel rail, the pressure from the fuel would push the o-ring down, allowing the fuel to slip past the injector along the sides.

 

All the O-Rings were brand new

-matt

 

If you had a sizeable o-ring leak of any kind you would not be able to idle at stoich. Any real o-ring leak ususally won't let the car even say running and alot of times won't start.

 

I spoke with a guy at Deatcshwerks today and he seems to think its a Lower O-Ring leak.

The amazing thing that puzzles me is that the car will not start with all zeros on the emange. I HAVE TO, repeat, HAVE TO Lag the injectors by .6 to get the car to start. If i dont the plugs become instantly soaked with fuel. I blew through literally two sets of plugs and an Oil Change when I first put the 555's in because it was dumping so much fuel. My oil right now after about a tank full of gas, smells like gas. That kinda leads me to believe its an O-Ring problem.

What do you think mike ? Do the 555's need to lagged that much (.6) to get the car started with 555's/Z32 MAF ?

-matt

 

An O ring leak would affect only the cylinder which had the leaky O ring, it wouldn't affect an entire set of plugs.

 

Some plugs were soaked some werent.

-matt

 

do some of the injectors look wet? The only good thing about having dirty injectors is you can tell when they are leaking lol.

~Alex

 

Your problem sound just like the issues I had when I put tin the 370s. As soon as I put them in the car would not start at all. I was to the point of pulling the plug to the fule pump until it started, then plug it back in once it was running. Huge plumes of black smoke would come out and smell like raw fuel. I had to drop fuel pressure to 30PSI and right now I have the injectors scaled down to .55 then use the a/f map and additional injection map to adjust fuel to where I need it.
Here is my thought process on why this happens. When you replaced the 370s with the 555s you increased fuel flow by 33.33% keep all other perameters equal, ie fuel pressure and EU Scale. I'm not sure what fruel pressure you were running with the 370s, but I have to run a heck of a lot less than 35psi with just the 370s. To me the scale of .6 to get her running does not seem unreasonable considering my experiences.
Now on the question of going rich after you let off the throddle, Where is your MAF located? If it is before the BOV that might be part of your problem. As your driving the air is being metered at a highter velocity and all is normal. When you let off the gas the air that has been metered and has not made it throught the intercoller to the TB yet gets released into the atmosphere. The computer has no way of knowing this and dumps a proportionate amount of fuel when compaired to the air that was metered. Since the fuel has been injected, and the air isnt there to mix with it, you have an automatic rich situation. I back fire evertime I let off the gas and it idols down. As an experiment I disconnected the BOV vacuum line to se what effect it had. Normal crusing with out getting into boost, the car ran like a draem. Not even a sputter. I'm collecting parts right now to beable to relocate the MAF, but time hasn't permitted.
Hope this helps
Choray

 

My fuel pressure I kept the same. 34 with vaccum attached.

My BOV is before the MAF on the charged side. Ive talked to many people about the Wideband Operation and mine are normal.

I just dont know why my Oil is reaking of gas so badly. Possibly the lower O-Ring on a few maybe even only one of the injectors is messed up and not seated in the Fuel Rail properly and more gas is leaking down and not 100% burning fully. Therefore contaminating the oil.

I understand what you mean but 370's werent an issue with my car. Im tempted to just go back to 370's. I could zero out all my setting on my EU when I had 370's/Z32 MAF and the car would start no problem but would lean out if I tried boosting.

Dont you want to increase fuel pressure so you get a better burn and then then decrease pulse width with the Emanage to bring everything back to normal.

-matt

 

Matty

I know you called in to the shop today. Why you didn't ask to talk to me I dont' know. You spoke with Dave, who doesn't really know the complete situation. We spoke after you called, and him saying it might be a lower o-ring is just the best guess he could make with an over the phone diagnosis.

From whay you have told me the car is running fine. You complain of it running a too rich for your liking on start up, but once the car is warmed up you say the car runs great.

You say your oil smelled like gas when you changed it. Would this be the same oil you tuned on and ran ultra rich before the EU changes? The same oil that you fouled out spark plugs on?

Your car would not be running anything like it is if you had leaking lower o-rings. Try chaning the oil, and check it again next change and see where your at.

 

Mike,

I had no clue that you were there today or I would have asked for you, for sure.

The oil that I drained today was not the oil that I had in when i foulded out the two sets of plugs when the motor first attempted to turn over many times and I did so some tuning on these plugs and oil but NO boosted runs. My clutch is still breaking in so its alot of jsut normal driving and cold start ups.

The reason why I think its an O-ring problem is because the Oil smells like gas and that dave said it can still find perfectly fine, fine a/f, and an O-Ring can be outa wack. Also arent there guys with 555's, being able to start their motors with NO corrections ?? When I first tried starting the car, the car wouldnt start unless I lagged the injectors. He even said, its hit or miss when installing them. Its only the second time I did it, but I definetly lubed them up enough.

I put in new oil today and will tune a bit and get it right then see where I am at. I wanna put some miles on the cltuch so I can start getting up in the revs a bit.

 

If you scale down the injectors just a little more, you should be ok. I had this same problem, and the injectors were perfect. It was just a problem in the programing.

 

By scale, you mean "Lagging" ??

Right now I am .6 in the Lagging box and I am also pulling a little fuel on the i/j adj map

-matt

 

Any update?

 

It rained yesterday, and im workin today, so hopefully tonight or tomorrow

Im going to get the car started without changing the O-Rings. Its running too good to be the O-rings. It

-matt