Power Fc Help Afm Surge

[MJTru]

Hi mate

i was wondering if anyone can point me in the right direction. I have never gotten a straight answer regarding the PFC. i really don't except one either. I was wondering were in the power FC i can set or tune out a bigger turbo surge after revving the engine in neutral, or at stand still.

I have done some upgrades on my R33 GTR, and it runs great. First i upgraded to a 6boost top mount and a GTX3582r turbo with all other supporting mods to make it work. I then tuned it own my own. I'm still learning, but find it to be way more sensitive on a GTR than a GTS-T. Hence the 2 AFM

Well this is whats happening. after revving the engine it wants to stall but don't after it comes to idle. I can see it push out black smoke at close to idle. I feel as if it has to do with the bigger turbo still spinning to fast and pulling air through the AFM's. i have the BOV's vented back in through a Greddy Y-pipe so I'm thinking that the location of the returning air is fine because the Y-pipe has a spot for the returning air. I notice that i can drive through this phenomenon if i keep in mind that i have to let the turbo slow down by clutching in at the last moment. Only then does it not stall, or come close to it.

any help would be appreciated

Thanks Mate.

[Moodles2]

Obviously you are using custom intake piping for that turbo, photos will help. You need to look at things like AFM reversion where the angle of the air should be pointing away from the AFMs (and towards the turbo) when returning via the plumbback, whether there are any bends after the AFMs etc.

[MJTru]

I will take some photos in the morning mate,because i don't photos of the y-pipe on the car. i also have none of the BOV's venting back. so what you are saying is there is no way to tune this phenomenon out using the PFC???

From what i can remember the pipe has like a sleight angle pointing back into the turbo about 5 degree's very small. And I'm running twin HKS SSQ BOV's

vented back in.

So its all mechanical???

[MJTru]

OK i found this photo from a video i have until i can do better in the morning.

Edited December 7, 2012 by MJTru

[1400r]

fit a pair of 35 gtr afm they fix stall issues when running old style afm

although stalling issues don't exist if you ask nismoid

ps I have a pair for sale $250 each will do upto 600rwkw in twin application

basically setup for z32 replacement

http://www.phoenixs.co.jp/bigsite/rb26dett/rb26dett_4.htm

Edited December 7, 2012 by 1400r

[Moodles2]

It could be the AFMs are just too close to the turbos

[Adriano]

_{Put stock Bov's on}

[scotty nm35]

Sorry, I can't see where the bov return enters the pipe, I would have thought straight into the front of that Y, pointing directly into the turbo would be the best spot...

[MJTru]

i thought that the AFM are to close to the turbos, but there just isn't any more room under the hood for the set up. how can i get them to be further from the turbo is there isn't anymore room.

has any done the setup that 1400r is talking about? is it true that the R35 AFM could be a replacement for the twin Z32. i wouldn't mine buying them if they can help with my stalling issues, how is it different 1400r, and what about the recalibration for the R35 AFM or are you saying that the Z32 AFM calibrations in the PFC work?? i will look into this and source information regarding this setup i find it interesting.

i will take photos of the set up close up and post the return to the turbos.

thanks again you all have given me a lot to think about.

[1400r]

i thought that the AFM are to close to the turbos, but there just isn't any more room under the hood for the set up. how can i get them to be further from the turbo is there isn't anymore room.

has any done the setup that 1400r is talking about? is it true that the R35 AFM could be a replacement for the twin Z32. i wouldn't mine buying them if they can help with my stalling issues, how is it different 1400r, and what about the recalibration for the R35 AFM or are you saying that the Z32 AFM calibrations in the PFC work?? i will look into this and source information regarding this setup i find it interesting.

i will take photos of the set up close up and post the return to the turbos.

thanks again you all have given me a lot to think about.

check the link I posted up plenty of highend tuning shops doing it in Japan

tuner would need fc logic pc software min and you'd need to check with them first

that they can edit the vq map in the fc logic software Im sure nisstune guys would be willing to assist the tuner with this

as from knowledge you'd be the first trying with power fc

3 cars done in SA with nisstune already r34 neo s14 sr and some sort of rb R31 that fitted 35 sensor to fix idle issue

when car was fitted and tuned with a hpx sensor

there a one way sensor so when air pass back the wrong way over the sensor it isn't picked up

Edited December 7, 2012 by 1400r

[MJTru]

Can anyone show me there set up for twin z32 AFM and there recirculation pipe.

I'm looking for a idea of how far away the AFM have to be from the turbo and the location or distance of the relocation pipe from AFM and turbo.

the idea is to stop stalling problems

thanks

[R31Nismoid]

You need it as far as you can basically - so if you can make it further way, do it and problem solved.

Also putting the stock BOV's back on for recirc also greatly helps this

[MJTru]

i was hoping you would take this up R31Nismoid and thanks, the only way to do it i think would to place then in the inner part of the fender well.

This will mean more fab work. Why would the stock BOV's help the phenomenon out? i thought that they all work the same, can you go min to some details how this would make a difference thanks for mentioning this as well Adriano. i just don't understand why it would make such a big help?

i also would like to pass this by you all. i have a D-jetro PFC in my room just sitting there, can it handle the same power out puts as AFM?? are they easy to tune like the L-jetro's.

should i drop the L for the D setup and what advantages would i gain over the L set up???????

would i be able to run ATMO BOV's.

thanks a million

[rob82]

D-jetro are no where near as good as afm based pfc's. I've tuned plenty of d-jetro's and they never tune as nice.

You need bov's that will vent under vacuum (less than 20 kpa of vacuum) - this is how the factory valves work. This will minimize reversion.

You could also try the afm's that 1400r is selling. I personnally haven't tried them but I have used similar item in other ecu's with no reversion issues.

[MJTru]

D-jetro are no where near as good as afm based pfc's. I've tuned plenty of d-jetro's and they never tune as nice.

You need bov's that will vent under vacuum (less than 20 kpa of vacuum) - this is how the factory valves work. This will minimize reversion.

You could also try the afm's that 1400r is selling. I personnally haven't tried them but I have used similar item in other ecu's with no reversion issues.

I am willing to give the r35 a try, but only after the home work on them is done, i need to see that people are having success with them on the aspects of calibration in different pipe sizes. I have some sort of knowledge on the items but not like some gurus in here. the power FC has the air flow curve for a couple of Nissan AFMs, but none for the R35 AFM's

you mentioned that you used other items, can you mention a few that works for you, i feel like i should pull my Haltech PS2000 out my GTST and put the dam thing in my GTR lol.

thanks for the input mate.

[1400r]

you wont need to worry abut different pipe size unless you make over 600rwkw as each 35 afm in z32 pipe size will do 300rwkw

the fc has no preset 35 amf map yes hence why you'd need fc logic to edit say the q45 afm vq map to suit

http://minkara.carvi...9/blog/c787696/

dude running r35 afm on a wrx with power fc

I've emailed the fc logic guys for you easiest way to find out

Edited December 9, 2012 by 1400r

[rob82]

The r35 afm's look almost identical to the Subaru wrx afm post 2002. Mazda also use similar denso sensors. They have a sampling port that meters air perpendicular to the flow of the incoming air. This means that they are almost impervious to reversion.

I've tuned a lot of Subaru and Mazda oem ecm's of all sorts without any revision issues.

[1400r]

couple of the cars in the phoenix power link are running 35 afm with power fc's

[MJTru]

i'm no guru, mate. i would like some one to provide the air flow curve or moded values for the vq curve, and i will buy 2 of them asap.

if you can provide these curves then i think that all your R35 AFM's will go like crazy. The jap links are in Japanese and that helps no one mate.

I do believe that the what you describe will come to be more and more main stream, and that you are on to something good, but i have to time the way i jump on this idea.

thanks again why are you selling yours

[scotty nm35]

The r35 afm's look almost identical to the Subaru wrx afm post 2002. Mazda also use similar denso sensors. They have a sampling port that meters air perpendicular to the flow of the incoming air. This means that they are almost impervious to reversion.

I've tuned a lot of Subaru and Mazda oem ecm's of all sorts without any revision issues.

They are better AFM's for reversion but they can still play up, depending on how the BOV is plumbed back. VQ/WRX/R35 sensors are all very similar, but the hassle with the inbuilt processor playing up doesn't seem worth the hassle, especially with no diagnostic/limp ecu protection.

I went MAP and never looked back.