Running totally lean after 5500rpm
 

D16Z6
15g turbo
450's
walbro 255lph
ebay fmic
Running 9psi@ectune

The car runes fine in every gear, till 5500rpm that is. After that it feels like fuel is cut and the car sputters and holds in. The A/F gauge also reads lean from that moment on (duh).

New FPR; no result
New pump: no result

Is it possible that the injectors are clogged? If so, why isn't the car holding in/sputtering @ lower rpms?

Re: Running totally lean after 5500rpm
 

Re: Running totally lean after 5500rpm
 

Re: Running totally lean after 5500rpm
 

Add 10% fuel and see what happens..

Re: Running totally lean after 5500rpm
 

You don't understand, I was actually getting it tuned when that happened. So Frank (@Ectune.com, great guy!) was tuning the lower rpm range. While tuning, he already mentioned I had a very thirsty turbo. After that we went for the higher rpm range, and that's where we found out it went lean (@ WOT). So, not enough fuel.. what could it be.. Fuelfilter seemed fine. FPR? Fuelpump?
So we put a working FPR on, no result. Also a new walbro 255, no result. We didn't had any other injectors available, so we couldn't proceed with the tune, and I went home.

So, again, what else could it be? And then again: Is it possible that the injectors are clogged? If so, why isn't the car holding in/sputtering @ lower rpms?

Re: Running totally lean after 5500rpm
 

Try and add a ---- ton of fuel. If its to much take some out.

Re: Running totally lean after 5500rpm
 

Quoted for the lack of common sense.

How exactly does a fuel filter "seem fine"? Did you flow test that bitch?

Not saying thats your problem, but your problem is that you are overlooking something increadibly obvious, as you would rule out a fuel filter, such you have already ruled out something else.

Post pics of the engine bay pls.

Re: Running totally lean after 5500rpm
 

wait you are discussing going lean on a basemap. No ----, dont rev even close to 5500rpm. Stay out of boost fool!


GET A TUNE CHEAP ASS

Re: Running totally lean after 5500rpm
 

It was being tuned when we noticed it you dumb ass fool. In ectune we maxed out the injectors and we still got the same problem. (450s + 255lph not enough for a z6+15g? = something wrong)

Re: Running totally lean after 5500rpm
 

Here you go

Re: Running totally lean after 5500rpm
 

I cant tell from the pics, but did you mix black dsm 450s and blue 450's?

Re: Running totally lean after 5500rpm
 

right at 5500rpm no matter what you do with fuel uh?

Is it reading a little lean, or reading full lean and the engine sounds like it's breaking up? You could be getting a misfire that's going to read lean no matter what cause when a cyl doesn't fire there is a cyl worth of unburned air throwing off the wideband.

Put a gage on the fuel rail. You could have a restriction in the fuel system somewhere. I fucked and used the wrong fuel line when I swapped to a b16 and I had a huge restriction where the fuel line bolted to the rail. Didn't matter what I did to the map I drained the rail.

Is something fucked up mechanically or electronically with vtec?
Sounds odd that it happens right at 5500 no matter what like you're switching maps but the motor isn't or something stupid like that.

Re: Running totally lean after 5500rpm
 

No, it just looks like that because one clip broke off a bit (still sitting firmly though). All blue 450's.

Note: I only have 1 resistor (instead of 4) hooked up to the 4 wires comming from the injectors (see above right corner, with black electrical tape). Don't tell me that can be the reason it's leaning out..?

Re: Running totally lean after 5500rpm
 

*taking a drive to be sure*

Re: Running totally lean after 5500rpm
 

theres your problem.

Re: Running totally lean after 5500rpm
 

What, the clip or the fact that i'm only running 1 resistor instead of 4?

Re: Running totally lean after 5500rpm
 

The resistor... Run one resistor per injector or a box.

Re: Running totally lean after 5500rpm
 

Btw, oil line on the manifold is not a good idea. You know how hot a manifold is don't you?

Re: Running totally lean after 5500rpm
 

.

Yeah I understand, but what does the "lack of resistance" has to do with injectors not functioning properly in higher rpm's?

Teg2Boo: Yeah I know, any other suggestions?

Re: Running totally lean after 5500rpm
 

Ohms law. Google it.

You will eventually kill your ecu if you leave it that way.

Re: Running totally lean after 5500rpm
 

Can't believe it, I actually had 4 resistors inline before my m8 took them off and only installed 1.

But, are you all saying that running 4 resistors/res. box is THE solution for my problem? Please confirm so I can sleep well tonight.

Re: Running totally lean after 5500rpm
 

yes it is the solution and kick your m8 in the nuts and thank him for this f**k up.

Re: Running totally lean after 5500rpm
 

Ok, thanks!
So I googled, and from what I read, in short it means that with too low resistance the injectors get overpowered so they (the injector drivers) disable to be safe? (which causes the injector to stop flowing, thus making the car sputter/run like ----). Correct me if i'm wrong please.

Re: Running totally lean after 5500rpm
 

Something like that.. stop trying to figure out why and just fix it before you fry either the engine or your ecu. THEN go back and see why it was wrong.

Re: Running totally lean after 5500rpm
 

No, the driver circuit on a Honda doesn't know if it's flowing too much current. It's a dumb circuit that expects a smart injector install to protect it. Wiring in a resistor pack will save your injector drivers in the long term, but I doubt it is what is causing your problem.

Since you have the car, why don't you do the routine diagnostics? It's obviously running out of fuel, go verify that.

Re: Running totally lean after 5500rpm
 

Resistor box ....$10........... JUST WAIT I have pix for you


Attachment 13820

Re: Running totally lean after 5500rpm
 

Im too lazy to read the whole thread and do not know if this has been mentioned, Maybe the timing is too conservative and causing missfires. Also what shape are the wires, cap, button in? No matter what if it is breaking up it will look lean. Hope this helps some. Also fix the damn resistors. Tell Frank I said Hi.

Re: Running totally lean after 5500rpm
 

Get the resistors in there and also what gap you running on the plugs?

Re: Running totally lean after 5500rpm
 

rewire your resistors. I had same ---- happen to my B16 fine for 9psi up to 5400rpms and then like a rev limiter. Replaced everything pump, filter, cleaned injectors and nothing. [b]Turned out to one of the wires for the resistor box was wired in wrong. FIX THE RESISTOR BOX WIRING

Re: Running totally lean after 5500rpm
 

boost cut? that was my first thought. my second is go a step coler on the plugs. if you already did that then close the gap on them some. if none of that fixes it, then come back.

fix your resistors too.

Re: Running totally lean after 5500rpm
 

My first thought was that the op needs slapped in the dick with a rubber mallet. who runs one resistor for all inyectors.
as a sometimes tuner it's things like this that make a nice tune turn into all day and half the night.

Re: Running totally lean after 5500rpm
 

I was just talking about this exact thing today. Right now I am messing with a 240 that has a 1jz engine from a Toyota Soarer in conjunction with a MAP ecu. I have no way of checking CEL's and the harness has been severely molested. All the ecu sechamitics diagrams I have found were in JDM language and im not JDM. Things like this can turn a tune into a month.

P.S. I found the english version finally

Re: Running totally lean after 5500rpm
 

Kick me the english version, Adam?

Re: Running totally lean after 5500rpm
 

Find someone to work on your car who has an average IQ. Your proof that gifted people are meant to work on wall street.

Re: Running totally lean after 5500rpm
 

Sir you have a pm, and I will also share for the masses http://www.trackdaymedia.com/~manny/...0__pinouts.pdf

also the list of codes http://soarercentral.com/sc-forum/me.../1113/862.html

You read them just like a Honda.

Re: Running totally lean after 5500rpm
 

Grooooooovy.

Re: Running totally lean after 5500rpm
 

Want.

Re: Running totally lean after 5500rpm
 

I put 4 resistors inline and the problem's solved.

Thanks!

Re: Running totally lean after 5500rpm
 

Hi!! ;D

Thanks guys! I really had a hard time figuring out why this pig was not responding normally. I ended up with a duty cycle of 105% @ 5psi @ 5000rpm and still it was falling like a rock in the canyon. No matter what I did it kept falling. I searched for a resistorbox in my stuff but didnt have 1 anymore. Otherwise this topic never existed.


Thanks again!

Re: Running totally lean after 5500rpm
 

Since we are on the topic of resistors and injectors, Let me throw this out there real quick. A customer brought me a 240 with a 1JZ. Car ran fine on 10psi with stock injectors, Now he has put in 750cc and the car will not act right. I am having to run somewhere around 13.0 a/f to get the thing to idle with no misfires. I then find out he was sent peak and hold injectors instead of saturated and has run these with no resistors. Are these things paper weights now? We put resistors inline now and it is still not wanting to act right. Is there any way to test myself or do I need to send them off? Thanks