Jump to content
SAU Community

Modifications To R32 Gtr Airbox

Brezza

By Brezza,
in Engines & Forced Induction

 Share

Recommended Posts

Brezza Proficient

Brezza

Posted
Posted

hey guys,

my mods are the following:

fully rebuilt RB26 with forged internals

recond head (done when engine rebuilt)

R34 GTR intercooler

Mines dump pipes & Trust y pipe

3in Decat

3in cat back exhaust

3.5in muffler

660cc injectors

Walbro Fuel pump

Nistune ECU

Garrett -5' turbos

stock AFM's & Airbox

Bleed Valve set to 18psi

last dyno run around 6 month ago 320rwkw & 18psi on 98 octane

New Parts to come

Turbosmart e-boost street

Yellow Jacket coilpacks

Nismo AFM's

i am wanting to safely have a tune over that 320rwkw without having the AFM's maxed out

will i need to install pods or modify my stock 32 GTR airbox to push the boost up to 20psi or more and try for 350rwkw.

i heard that the R34 GTR airbox will flow 350rwkw, but will the stock R32 GTR one do the same?

will 350rwkw be achievable with the mods i have without having to change anything else?

also i am running 100 octane fuel now, and will be getting the tune done for that fuel.

Link to comment
https://www.sau.com.au/forums/topic/332259-modifications-to-r32-gtr-airbox/
Share on other sites
Deano 1 Mentor

Deano 1

Posted
Posted

the stock airbox should flow 380-400kw ive seen a fair few people on here say that they have done it. You should see 350 with them mods and the AFM's. 320kw for the factory afms is pritty up there, but than again could be a happy dyno.

anyway let us no how you go, as thats the same setup as i plan on running once i built my motor.

Brezza Proficient

Brezza

Posted
  • Author
Posted
Yes. I ran close to 380rwkw with a standard 32 gtr air box. Remove the front intake snorkel that goes to the headlight if it's still there. Standard air filter.

yeah,

i still got that front intake snorkel.

i'll get the mechanic to remove it when he changes the AFM's

its good to know that the stock air box can still flow enough to get close to 380rwkw. i'd pefer to keep the GTR looking stock under the hood.

cheers mate

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

I highly doubt you'll get a legit 320rwkw out of stock AFM's. You'll be tuning past thier limit for that level.

Stock AFM's limit is around 280-300rwkw, anything more and it's being tuned past...

Given you have -5s which are 380rwkw-400rwkw (20-22psi) of turbo, you need AFM's.

Brezza Proficient

Brezza

Posted
  • Author
Posted
I highly doubt you'll get a legit 320rwkw out of stock AFM's. You'll be tuning past thier limit for that level.

Stock AFM's limit is around 280-300rwkw, anything more and it's being tuned past...

Given you have -5s which are 380rwkw-400rwkw (20-22psi) of turbo, you need AFM's.

yeah the tuner did say that he tuned past them.

i'm really wanting to get the turbo's really coming alive at around 20-22psi

the jump from 15psi to 18psi was huge on those turbo's it seems the high boost is needed to really wake them up.

R31Nismoid, do you think that the airbox would be able to flow 350rwkw?

i am saying that number because of the intercooler and suggested exhaust would possibly be holding me back from more.

Deano 1 Mentor

Deano 1

Posted
Posted

i was reading another thread today that i found in search.... and there was a guy on there saying his making 340kw with the stock box in place. so its been done mate. you should have no worries

george_afc_23 Enthusiast

george_afc_23

Posted
Posted

Hey guys,

Pretty new to all this but I was reading in HPI magazine about tuning gtr's...they suggest the -5 turbos, nismo fuel pump and 660 or 700cc injectors as mods that will suit eachother capable for around 300rwkw mark...didnt mention anythin about changin afm's?....at what power should you look at changing them? I've also heard while it's illegal that some just gut their afm's for better performance, anyone heard of this?

Thanks, George

GTRPowa Rising Star

GTRPowa

Posted
Posted
Hey guys,

Pretty new to all this but I was reading in HPI magazine about tuning gtr's...they suggest the -5 turbos, nismo fuel pump and 660 or 700cc injectors as mods that will suit eachother capable for around 300rwkw mark...didnt mention anythin about changin afm's?....at what power should you look at changing them? I've also heard while it's illegal that some just gut their afm's for better performance, anyone heard of this?

Thanks, George

Sup,

As far as I know you can only generally gut an AFM if you are running an engine computer which uses a MAP sensor.

These people would for example, be running a powerfc d-jetro (which uses a MAP sensor) and then gut their AFM's for the 'extra' airflow.

This would be to retain a stock air filter setup, whether factory airbox, or the huge range of pods, without going to the cost of buying/making a pipe to replace them.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
Hey guys,

Pretty new to all this but I was reading in HPI magazine about tuning gtr's...they suggest the -5 turbos, nismo fuel pump and 660 or 700cc injectors as mods that will suit eachother capable for around 300rwkw mark...didnt mention anythin about changin afm's?....at what power should you look at changing them? I've also heard while it's illegal that some just gut their afm's for better performance, anyone heard of this?

Thanks, George

They are the WRONG turbos for 300-330rwkw.

Please do a search, there is plenty of info around, hell there is an entire thread devoted just to "-9s & -5's".

XRATED Veteran

XRATED

Posted
Posted
yeah the tuner did say that he tuned past them.

i'm really wanting to get the turbo's really coming alive at around 20-22psi

the jump from 15psi to 18psi was huge on those turbo's it seems the high boost is needed to really wake them up.

R31Nismoid, do you think that the airbox would be able to flow 350rwkw?

i am saying that number because of the intercooler and suggested exhaust would possibly be holding me back from more.

Honestly your pushing the upper limmits of a stock 34 cooler, 3" exhaust and a stock airbox anything close to 350rwkw... It can be done, but your not doing yourself any favors by not addressing them. The cooler will flow allright at 350, it will get heatsoaked fairly quickly through. There is a huge difference between 3" exhausts, just make shure you have a decent y pipe (the merge from the two dump pipes to the cat) as the factory set up is junk.

I'd keep the snorkel and modify the air box. Cut a hole in the airbox before the filter and run a hose from the front bar/guard into the box- it's been done plenty of times before... search 'cold air induction'.

As for you AFM's, rb20afm's plug directly into the rb26 loom and are good for 200rwkw each. They're also bigger than the 26 afm's. But if direct fittment and stock look are the goals, then the extra bucks for the nismo's are worth it.

Hey guys,

Pretty new to all this but I was reading in HPI magazine about tuning gtr's...they suggest the -5 turbos, nismo fuel pump and 660 or 700cc injectors as mods that will suit eachother capable for around 300rwkw mark...didnt mention anythin about changin afm's?....at what power should you look at changing them? I've also heard while it's illegal that some just gut their afm's for better performance, anyone heard of this?

Thanks, George

Keep reading... and not just HPI.

Brezza Proficient

Brezza

Posted
  • Author
Posted
Honestly your pushing the upper limmits of a stock 34 cooler, 3" exhaust and a stock airbox anything close to 350rwkw... It can be done, but your not doing yourself any favors by not addressing them. The cooler will flow allright at 350, it will get heatsoaked fairly quickly through. There is a huge difference between 3" exhausts, just make shure you have a decent y pipe (the merge from the two dump pipes to the cat) as the factory set up is junk.

I'd keep the snorkel and modify the air box. Cut a hole in the airbox before the filter and run a hose from the front bar/guard into the box- it's been done plenty of times before... search 'cold air induction'.

As for you AFM's, rb20afm's plug directly into the rb26 loom and are good for 200rwkw each. They're also bigger than the 26 afm's. But if direct fittment and stock look are the goals, then the extra bucks for the nismo's are worth it.

i have one of those off the shelf y pipes, i am not sure what brand it was. but it was one from car toys. the previous owner put it on there before i bought the car. the 3in cat back is pretty much all straight pipe with 2 mild bends to the 3.5in oval muffler.

i did look into getting 2x RB20 afm's but considering that they're just as old as my stock ones and they're from different cars they may not read evenly and maybe be a little harder to tune perfectly.

i opted for the nismo ones for the obvious that they're an upgrade, brand new & look stock.

my missus car has leaned out and overheated making one piston crack, this is all due to the AFM. its a WRX btw. so i just didnt want my car doing the same because i was getting my car tuned past the AFM limit and given they're over 20 years old.

  • 3 weeks later...
Brezza Proficient

Brezza

Posted
  • Author
Posted

just an update,

the tuner called me and said the car made 351rwkw on 21psi

i am picking up the car tomorrow and i'll post up a dyno graph of the results.

i am not sure yet whether the snorkel was removed.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • BaronOBeefdip
      Baron's R34 GT-R build thread - car in Japan for 5 years -_-

      By BaronOBeefdip · Posted

      Back again. I returned to Japan in Jul/Aug to spend time with the car on my birthday and remind myself what all the sacrifice and compromise is for. It happened to line up with the monthly morning meet in Okutama, which I have been wanting to go to for a long time. It's a unique event at a unique spot with really rare, interesting, and quirky cars. It's where all the oldheads and OGs gather. The nighttime scene at DKF certainly has its place and should be experienced if you're into cars, but there's too much bad attention and negativity around it now. IMO the better time is Sunday morning at DKF or Okutama; it's more chill and relaxed. I'm glad I was finally able to go, but not sure it's worth the drive from all the way from Nagoya immediately the day before, unless I was already staying in Tokyo for the days right before the meet, because you have to wake up quite early to make it in time. Funnily enough though I didn't drive the car all that much this trip because it was just too damn hot. While there were zero issues and running temps were nominal and the A/C was strong, RBs already run crazy hot as it is. Sure, it took it all like a champ but something about driving these cars in the ridiculous heat/humidity bothers me and makes me feel like I'm asking too much of it. I'm just me being weird and treating the car like a living thing with feelings; I'm mechanically sympathetic to a fault. Instead I was mainly driving something else around - a KX4(silver) 2001 X-Trail GT, that I acquired in May. There's a few different flavors to choose from with Xs, but visually it's the Nissan version of the Honda CR-V. Mechanically it's a whole different story as this, being the top-trim GT, has an SR20VET mated to a four-speed auto and full-time AWD! It was a very affordable buy in exceptional condition inside and out, with very low mileage...only 48k kms. Most likely it was owned by an older person who kept it garaged and well-maintained, so I'm really happy with how it all worked out. It literally needs zero attention at the moment, albeit except for some minor visual touch-ups. I wanted something quirky, interesting, and practical and for sure it handily delivers on all three of those aspects. I was immediately able to utilize the cargo and passenger capacity to its full extent. It's a lot of fun to drive and is quite punchy through 1st and 2nd. It's very unassuming -in the twisty bits it's a lot more composed than one would think at a glance- and it'll be even better once I get better tires on it(yes, it's an SUV but still a little boat-y for my liking). So...now I have two golden-era Nissans in silver. One sports car and one that does everything else; the perfect two-car solution I think👍 The rest of the trip...I was able to turn my stressed brain off and enjoy it, although I didn't quite get to do as much as I thought. I did some interesting things, met some interesting people, and happened into some interesting situations however, that's all for another post though only if people really want to know. Project-wise, I went back to Mine's again to discuss more plans and am hoping to wrap that up real soon; keep watching this space if that interests you. Additionally, while working in the tormenting sweatbox that is the warehouse, I was able to organize most of the myriad of parts that my friend is storing for me along with the cars, and the 34 has a nice little spot carved out for it: And since it can get so stupid hot in there, that made it all the more easy -after I was standing there looking at the car and said 'f**k it'- to finally remove all the damn gauges that have mostly been an eyesore all this time. Huzzah. The heat basically makes the adhesive backing on the gauge mounts more pliable to work with, so it was far less stressful getting this done. I didn't fully clean it up or chase the wiring though; that will happen once I have the car in closer possession. Another major reason to remove all that stuff is to give people less reasons to get in my car and steal s**t while it's being exported/imported when/if the time comes, which leads us to my next point... ...and that is even though it's time in Japan is technically almost up since it's a November car and the X would be coming in March, I'm still not entirely sure where my life and career is headed; I don't really know what the future looks like and where I'm going to end up. I feel there's a great deal of uncertainty with me and as a result of that, it feels like I'm at a crossroads moreso now than any point in my life thus far and there are some choices I need to make. Yes, I've had some years to consider things and prepare myself, however too much has happened in that time to maintain confidence and everything feels so up in the air; tenuous one might say. Simply put, there's just too much nonsense going on right now from multiple vectors. Admittedly, I'm struggling to stay in the game and keep my eyes on the prize. So much so in fact, that very recently I came the closest I ever have before to calling it quits outright; selling everything and moving on and not looking back. The astute among you will pick up on key subtext within this paragraph. In the meantime I've still managed to slowly acquire some final bits for the car, but it feels nice knowing there's not much left to get and I'm almost across that finish line; I have almost everything I'll ever want for my interpretation and expression on what it is I think an R34 should be. 'til later.
    • Bwagz
      Engine model

      By Bwagz · Posted

      Thanks for that, hadn’t used my brain enough to think about that. 
    • MBS206
      R33 GTR running -9 with no tune

      By MBS206 · Posted

      Also playing with fire if they start to flow more air down low than what the stock twins can. It's not even up top you need to worry, it can be at 3000rpm and part throttle and it's getting way more flow than it should.
    • Piggaz
      Garrett G Series

      By Piggaz · Posted

      Any G40/1000 or G40/1250 results out there?  
    • joshuaho96
      R33 GTR running -9 with no tune

      By joshuaho96 · Posted

      You still want a proper tune on the stock ECU though. Stock tune + stock ECU with GT-SS/-9s is probably playing with fire if you're running more than stock airflow/power.
×
×
  • Create New...