recirculated or open atmosphere

[shally2186]

does anyone recirculate anymore???all i ever see are open to the atmosphere..even seen a stock BOV being recirculated and a open atmosphere????wats up w that

[rb25drag]

I re-circulate.

Most people run open atmosphere to make more noise! I can careless about that. I re-circulate for more efficency.

[Darius]

You need to recirculate your BOV if you are running your MAF sensor ahead of the turbo. Engine falls on its face in off-throttle situations if you do not.

You can run an atmospheric BOV if you are running your MAF sensor in a blow-thru arrangement.

[shally2186]

well is my setup alright??? im sorry but i couldnt understand what you were saying about my MAF location

[d356bud]

what I think he means you have your MAF sensor in series with your charge pipes and have he BOV between the MAF and the Turbo. Therefore the MAF wont read air that isn't going to the engine.

[govtworkhorse]

I ran my HKS like that with no problems. Some people can get away with it.

Off topic...your engine bay needs some TLC lol. That sh1t it dirty.

[shally2186]

lol you are soo right bud,but thanks for pointing out the obvious...notice the birds nest of wires on the left...im working on it tho,things have to get worse before they ge better...

back on topic: i was told that my BOV should be as close to the turbo as possible..if thats true then wats up with the stock place for the BOV???has anyone ever relocated theyr MAF??

[Coolwhip]

I run a HKS to atmosphere in the stock location and have no issues. Yes, its not the best to run that way but as long as I don't have drivability issues with it shutting off I'm fine.

But BOV placement has little effect on its operations.

The blow-threw MAF set up is this:

Intake filter -> Intake Pipe -> Turbo -> Charge Pipe w/ BOV -> Charge Pipe w/ MAF hooked up inline -> Throttle body

So in other words, the MAF is behind the BOV. Its been covered.

[Darius]

Some people say their motor runs fine without it recirculated, but what their definition of "fine" is all relative. Without recirculating, the engine IS going to run rich until the valve closes again. It is possible to lean out areas of the map that go rich when the BOV is open if you have a stand alone ECU. I believe the PFC also has a setting to help correct for atmospheric BOVs but it is kind of a jimmy-rig in the program.

If you are running a blow-thru setup, your MAF is immediately upstream of the throttle body, so it is measuring only the air that is going into the engine. The BOV is either in the cold pipe between the MAF and the intercooler or in the hot pipe upstream of the intercooler.

Shally, you are having enough problems with your motor running right now that I would add recirculating the BOV to the intake pipe to your "to do" list.

[shally2186]

thanks DARIUS..i will def look into getting it recirculated ASAP..my car IS running rich as F and that might be another reason why...thanks again..im very open for any help and info

[Shocker]

I map, tial 50mm ftw.

[DriftingisLame]

How can everyone fit a Koyo but me!

Do you have mounts or a crossmember?

[240z4u]

Pull that BOV out and cap it off to test and see if that helps.

Is that a turbo XS? Mine leaked horribly. Both from the side that pulls vac. from the intake and from the side that blows off boost.

Evan

[shally2186]

i

How can everyone fit a Koyo but me!

Do you have mounts or a crossmember?

if your asking if i have them for sale..i dont..crossmember on my car

EVAN: yea thats a turbo xs and it hasnt leaked yet..i had a HKS knock off and it always would stick open..

[Cracka Matt]

i ran to atmosphere and doesnt cause any shutting off or anything, bu i dont doubt that it cause a few moments or running rich. also have a turbo xs blow off valve, havent had any leaking issues and its been on there a couple years now

[BoostFab]

you can run open atmos with something as simple as a safc to compensate for the lost air. ideally you should run recir with the maf

[shally2186]

i have a Z32 MAF..do you all run them in ur RB's???

[Chaos the Xile]

I'm running a Q45 Maf on mine.

[Nick51]

i have a Z32 MAF..do you all run them in ur RB's???

shoot im still running the stock 20 with stock maf recirculated, other than that im running a lil rich with the walbro

[240z4u]

You ARE running something to control that MAF right? You can't run a z32 maf on a stock unmodded ECU.

[QUOTE=shally2186]i have a Z32 MAF..do you all run them in ur RB's???[/QUOTE

[garage-c]

You need to recirculate your BOV if you are running your MAF sensor ahead of the turbo. Engine falls on its face in off-throttle situations if you do not.

This is true, BUT if you have a device like the E-Manage Ultimate, SAFC, or HKS EIDS, you can clamp the maf voltage very low when your TPS reads below a certain value.

On my E-Manage Ultimate, I have the MAF voltage clamped to 1.18v for 2 seconds as soon as my TPS reads minimum voltage. This prevents the engine from stalling or bogging completely.

E-Manage Ultimate

[craz4240]

You ARE running something to control that MAF right? You can't run a z32 maf on a stock unmodded ECU.

i have a Z32 MAF..do you all run them in ur RB's???[/QUOTE

My thoughts exactly....440cc injectors,z32 mafs and no ecu tune,possibly no resistor either....I would start there with the issues bud lol.

[shally2186]

You ARE running something to control that MAF right? You can't run a z32 maf on a stock unmodded ECU.

i have a Z32 MAF..do you all run them in ur RB's???[/QUOTE

yea my ECU was Flashed,but i was told that it probably needs to be reflashed

[jt15833]

i

if your asking if i have them for sale..i dont..crossmember on my car

EVAN: yea thats a turbo xs and it hasnt leaked yet..i had a HKS knock off and it always would stick open..

lol he wanted to know if your running different mounts or a different xmember. He's curious about how you can fit the engine and a koyo radiator and he cannot.

[shally2186]

ok guys,im here working on my car now...here is wat happened upon starting it..it started up alright and idled @ about 1k..then about after 10 sec it dropped and was almost staulin..then after like ten more sec it would pick back up to 1k..then back down to almost staulin again..it was barely running..what do you think is the reason for this behavior???

[240z4u]

This is crazy, have you read ANY of the replies to your questions?

You have 440cc injectors, a z32 maf and god knows what else. You don't know if you actually have a chipped ECU, or if its chipped correctly.

What did you do about all the cut wiring where the SAFC was?

Sorry if this seems harsh, but you keep asking the same questions and getting the same answers. People who ask for advice, then ignore it drive me nuts.

Look into the things posted above, and in your other threads and THEN post another question.

Evan

[shally2186]

This is crazy, have you read ANY of the replies to your questions?

You have 440cc injectors, a z32 maf and god knows what else. You don't know if you actually have a chipped ECU, or if its chipped correctly.

What did you do about all the cut wiring where the SAFC was?

Sorry if this seems harsh, but you keep asking the same questions and getting the same answers. People who ask for advice, then ignore it drive me nuts.

Look into the things posted above, and in your other threads and THEN post another question.

Evan

theyr are numerous things that ca be wrong with the car and im not sure about how to go about correcting them..the car acts up so i ask u guys what u think is wrong,figuring that it has happened to someone b4...i taped all the bare wires goin to the ECU,im tryn to get ahold of carl H. to reflash my ECU,and im pulling my car apart to make sure everything is right with it...the car is always 40min away from me and i only get usually one day a week to come and work on it..the other days i ask for some info on it and trouble shoot online the conditions of my car...again this is my first NISSAN and also my first turbo car..dont worry about being too harsh either,i kno that u guys kno ur **** and are tired of retards like me asking the same questions over and over...

[240z4u]

Want my opinion?

Put stock injectors, ECU and maf on your car and see what happens.

We DO want to help, but it seems like your basically asking the same question over and over again.

Your on the right track getting ahold of carl H.

I understand its your first nissan turbo car, but honestly you got yourself in over your head by getting a project that was not complete.

Good luck man.

Evan

BTW, I have a stock RB25DET S2 ECU that I could set you up with. It has a few issues though. I have kept it for troubleshooting purposes.

[shally2186]

BTW, I have a stock RB25DET S2 ECU that I could set you up with. It has a few issues though. I have kept it for troubleshooting purposes. [/QUOTE]

could i use a 25 ECU?? i have the RB25 turbo