Jump to content
SAU Community

Fmic Piping Size Queries For Gt3076r Turbo?

anthonymcgrath
 Share

Recommended Posts

anthonymcgrath Collaborator

anthonymcgrath

Posted
Posted

hey all,

I'm fitting a gt3076r to my rb25det at the moment. Engine side is all sorted (forged, bored etc..)

However my fmic piping is a little shoddy with worn clamps n clips, so I'm looking to size up my fmic piping a little to accomodate the extra power.

here's what I have/had at the moment:

-arc fmic. Inlet/outlet diameter is 67mm

-the pipe coming off the fmic to the throttle body was 57mm

-the oem crossover pipe (which I used on the other side) was 63mm. This led down to another 57mm ID pipe.

I'm now fitting the turbo & greddy gtr style plenum:

-greddy plenum ID is 80mm.

-Q45 90mm throttle body to go on.

so my question is what size fmic piping shall I run? Looking at what I have then I'm coming off the turbo and into the fmic which will be 67mm. the air then exits that fmic 67mm and has to go into the 90mm throttle body.

My own deductions are to run somewhere between 67 - 76mm (3") piping all round but I'm curious on ppl's thoughts. I dont want to fit too small and restrict the pressure but I also dont want to fit too big and cause excess lag altho I wonder how much diffference that would make. I am happy to be corrected, advised and educated so if anyone has any thoughts for a learner in the uk then that would be cool! :) pics also ultra helpful too!

ta

ant

W0rp3D Grand Master

W0rp3D

Posted
Posted

How much power are you looking for and how much boost are you going to run?

The dimensions you mentioned seem ok for a 3076 just replace clamps and joiners if there worn, use the standard tb on the plenum (you can get adaptors on here somewhere) and i would also change the afm for a Z32, unless your going to over 350rwkw then the Q45 is just over kill.

RBceffy25 Rising Star

RBceffy25

Posted
Posted

I would also like some info on this.

What are the pro's and cons of bigger cooler piping? i.e less restriction? more lag? etc

And I really want to know what are pro's and con's of bigger throttle body?

Sorry if these are dumb questions. I havnt experimented with this yet so i'm quite interested in some info/opinions about it.

Cheers all!

anthonymcgrath Collaborator

anthonymcgrath

Posted
  • Author
Posted

@ worp3d

I'm aiming for 500bhp with the gt3076 - I dont know what psi of boost that is but possibly 1.4 to 1.6 bar (20 to 23 psi)

I already have a Z32 afm on. I've heard that they're fine for 500. I also have a Q45 afm sat about the house but thats overkill. RSP over here also said that they are a bitch to map the car with - never seem to give as smooth a signal as a Z32 afm.

I want to run the car tho with the bigger Q45 90mm throttle body so not putting the original one on even tho I have an adaptor for my plenum for it.

well I figured I wont go any bigger than the in/out diameter on the fmic which is 67mm. I think this is a good size to upgrade to.

@rbceffy25

basic rule of thumb is too small and the pipes become a restriction themselves especially as you run more power/boost. Conversely too big and lag occurs. I'm going up from 57mm to 67mm which for the extra 150bhp the car is making with this turbo I think will certainly help. the bigger throttle body will allow more air to enter the plenum faster I'm told. I cant see it making a massive difference tbh but its more a curiosity thing and if it just requires a longer cable and some slight rewiring to get it to work I may as well try :yes:

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

    • eli995
      Looking for a part number for this part here

      By eli995 · Posted

      (Rb25det intake manifold) I’m having a hell of a time trying to find the full part or part number of this coolant hardline so far I was given these (Below) but they aren’t what I’m looking for and was told it’s the IAR or aac valve but that doesn’t seem to be it either. If someone could point me in the right direction it’d be greatly appreciated. Or if anyone has it for sale that’d be great too. I have recently purchased a greddy manifold and I can’t seem to find my old one to pull it off.  (Front Heater Return / Water Pipe (under intake): Primary part: 14053‑21U10 (front return pipe assembly for R33/R34 RB25DET) Alternative listing: 14053‑21U00 (same pipe, sometimes interchangeably referenced)   Heater Feed Pipe: Listed as 14075‑04U00 or feed-related variant 14053‑AG500)    
    • GTSBoy
      Duncan's V37.......race car?

      By GTSBoy · Posted

      This sounds cool. But, as per usual, anything really complicated like that, that I take on, constitutes a steep learning curve that I never actually "learn". I just get it working, install it and start using it. Then, when it breaks a few months later, I've got no memory of what I did, how I did it, or even the bloody IP address I gave it. I'm having more or less exactly that problem right now. My Proxmox machine was discovered to be non-responsive, and the VMs on it were ditto. Power cycle it to a stream of loud Dell beep codes - which was unpopular at midnight, I can tell you. Move it to the lounge room so I can HDMI it to the TV for a screen, see the boot messages complaining about the /PVE/data having all sorts of LVM problems, saying it needs to be fixed manually. And I'm like....great. How am I going to work out what I need to do? At least it wasn't the stupid Silicon Power SSD shat itself. Mental note for all readers - DO NOT BUY SP SSDS! They are shit. I have had one take out an entire VM setup already, and this one could have done the same. Maybe it actually has. Cheap Chinesium shitbaskets. I won't cheap out again, even on play projects with no budget. Because my time budget having to fix shit is worth far more than the cost of proper parts.
    • MBS206
      Duncan's V37.......race car?

      By MBS206 · Posted

      I do typically agree. These days even the screens most people use have more of a boot time than the main device. However, I've seen an interesting use of the RPi in vehicle, however it involves effectively building your own OS and MBR, as then it boots up exceptionally quickly, as you don't have everything needing to start up, and you can then also run it up as an RTOS, while still having more compute than an Android can give for things like display, and processing. A very huge task that would be though for Duncan, I'm not sure that's his skill set (or Arduino programming and wiring) ha ha. If end goal is definitely just water cooling, Arduino would be the simpler setup especially for a rookie. If he wants extra display stuff though, bashing some code in Python on an RPi may be the better result for both systems.   Unfortunately the new device I'm building at work which runs a display, is too slow of a display for dashboard style purposes. More extreme low power, update only a couple of times a day type system
    • GTSBoy
      Duncan's V37.......race car?

      By GTSBoy · Posted

      I don't like "actual computers" for in car use. They take time to boot up, have OS annoyances, and so on. Arduinos etc are ready to go a few seconds after power on, don't mind being agressively powere cycled, because everything is non-volatile, don't mind being shaken and stirred.
    • MBS206
      Duncan's V37.......race car?

      By MBS206 · Posted

      As Fred would tell us, it's all about interpreting the rules. It's not a water sprayer, it's a water mister... But everything else you've said, 100%! Even a raspberry Pi would be great, use HDMI out for a display, and add a raspberry Pi CANBus hat to read values out from the ECU.
×
×
  • Create New...