Standalone & Z32 MAF in place, but still early cut-off. What gives??

[NeedCAforS13]

doesn't the powerFC still use a MAF? If so, then I would think it still has to be recirculated. But I'm no PFC expert, so don't take my word for it.

Sean

[JDMSIL80]

I thought the reason to recirculate BOV is to get the car to idle properly and avoid running rich between shifts, which is not related to my car problem.

Power FC is designed to run with MAF, its too bad they dont make the D-jetro version for the CA motor so I could use MAP instead.......

I will find out if the BOV is really acting on me tonight once I put the block off plate in.

[biosehnsucht]

yes you must recirc or put MAF AFTER BOV.

if you use a MAF at all, and its before BOV, and its not recirc.. you will have problems.

I think some of my occasional backfires are more from my BOV than anything else - it is recirc, but only partially.. its a dual outlet design that on big enough pressure changse it'll actually vent out the back opening too

[teambuiltnissan]

well you can run without recircu with power fc.. you need to get your commnader and map trace, and find out where it goes on decel. its about tuning.. but yes if you cant change nothing..like stock ecu. then its better to be recir. or blow thru MAF.but on your case. its not a recir problem.

you can run sr20det d-jetro with sr20-ca18 conversion harness.. I run those on my car without any problem.

just a thought

[mbmbmb23]

Are you 100% sure you have 440cc low impedence injectors? Any chance the Power FC is set up for something other than a ZMaf? (N62 orange sticker)

-m
Modified by mbmbmb23 at 8:41 PM 10/29/2005

[teambuiltnissan]

he is probably running DSM 440cc injector. they are 450cc but ya they are low impedence injectors.

[JDMSIL80]

Im running GT-R injectors, which are 444cc low impedence.

The Power FC has a MAF selection function which allows you to choose 4 different MAFs, including N62 which is what Im running...

Are you 100% sure you have 440cc low impedence injectors? Any chance the Power FC is set up for something other than a ZMaf? (N62 orange sticker)

-m

Modified by mbmbmb23 at 8:41 PM 10/29/2005

[JDMSIL80]

I have confirmed my ARC BOV is not leaking on me, its working the way it should be. We have also checked and confirmed that there is absolutely no boost leak in my setup.

The only possibility for the cut-out problem would only be the Z32 MAF. But I still refuse to believe this because there is no problem at all anywhere below 11psi, which is no where near the flow limit of the MAF. I have tried cleaning the sensor, but didn't help much.;

So what would be the next appropriate step to deal with this problem? My PFC settings are correct, spark plugs are new and no boost leak. Should I get myself a brand new Z32 MAF for god sake??

Sorry for keep bringing this thread up, Im really frustated and hopefully somebody here can shed the light.

[CA19DET]

borrow a buddies Z32 afm... see if that helps

[float_6969]

I mean no offense, but I had a PFC, and those things are really confusing to set up. Are you sure you don't just have something set up correctly in the computer? I could know that it's quite easy to screw it up. I think there is a reason they've got that initialize function.

[JDMSIL80]

Too bad I have no access to another Z32 MAF, Im pretty much the only guy who drives a Nissan in my group of Honda friends...

borrow a buddies Z32 afm... see if that helps

[JDMSIL80]

We're pretty sure its not the settings of the PFC, as I have tried pretty much everything that could trigger a boost or rev limited cut.I could imagine with the dataloggit the PFC would be much easier to use, but its not that bad once you get the hang of it with the Commander.The initialize function is also available in SAFC, its just for the ease to return default settings.

Some people said it still "could" be the plugs because iridiums tips do not work well with CA, so they suggested me to change the plugs to copper ones and reduce the gap further to 0.028". I will try that since it is one of the cheaper methods.

What do you guys think of the coil packs? could it be weak coil that couldn't produce enough current to jump the gap at high cylinder pressure?... just a thought.

I mean no offense, but I had a PFC, and those things are really confusing to set up. Are you sure you don't just have something set up correctly in the computer? I could know that it's quite easy to screw it up. I think there is a reason they've got that initialize function.

[mikesim]

this hasn't been mentioned, so i thought i'd ask; what is your CAS timing set to?

you could also hit fuel cut if your detonating becasue of being too far advanced.

[JDMSIL80]

How do I check the CAS timing? do I need a timing tool?

If you referring to the ignition map settings on the PFC, I can find out tonight when I get home.

this hasn't been mentioned, so i thought i'd ask; what is your CAS timing set to?

you could also hit fuel cut if your detonating becasue of being too far advanced.

[float_6969]

You'd just need a timing light. It walks you through how to do it in the stickies.

[JDMSIL80]

So I put in brand new copper plugs today and gapped them down to 0.028", the cut-off problem FINALLY went away!!!!

Thanks guys for all the help!

[JDMSIL80]

hey guys, I have tried putting in the copper plugs and gapped them down to 0.028" and the problem did went awway for the past 2 weeks! I was boosting 14 psi all day long with no problems. So I thought the problem finally solved...

But last night, the cut off problem re-occured AGAIN!! I have only ran the copper plugs for 800km, so Im sure they are still in good shape. Should I try gapping them further down?? Does it seem like my coil pack is acting up?

[nismoplsr]

Did you get it tuned once you were running 14psi? If not you may be running way to rich up top if your tuner played it very safe. To much fuel will kill your plugs and way to much will wash your cylinder walls, not good. Hopefully you were not running to lean that is bad too.

[JDMSIL80]

That could be a possibility, as my map was only tuned up to 11psi because of the previous cut-off problem. My tuner said the fuel map is running rich up top, so it should be safe. But Im not certain if it is overly rich that may cause the plugs to fail. My car does back-fires pretty often even when partial throttle in lower revs.

The car still revs to redline if I bring the boost down to 11psi. But at 14psi, it cuts out around 6000rpm.

Did you get it tuned once you were running 14psi? If not you may be running way to rich up top if your tuner played it very safe. To much fuel will kill your plugs and way to much will wash your cylinder walls, not good. Hopefully you were not running to lean that is bad too.