Jump to content
SAU Community

Improved Fuel Economy After Spacer Install?

180 wanabe
 Share

Recommended Posts

180 wanabe Proficient

180 wanabe

Posted
Posted

I was wondering if anyone had noticed any improvment in their fuel economy after installing the plenum spacer mod?

I know that the main reason for the install is to gain power but im sure i remember reading somewhere that it is supposed to improve MPG and wanted to know of this was BS or something real

Cheers

VE35GT Apprentice

VE35GT

Posted
Posted
I was wondering if anyone had noticed any improvment in their fuel economy after installing the plenum spacer mod?

I know that the main reason for the install is to gain power but im sure i remember reading somewhere that it is supposed to improve MPG and wanted to know of this was BS or something real

Cheers

Didn't notice a real difference (well that was once I got over 'testing' whether it really did breath better near the redline... I think we all know what happens to the VQ's fuel consumption figures when the needle is making frequent trips to the Right Hand Side of the tacho)

Kam-80 Enthusiast

Kam-80

Posted
Posted

Also didn't notice a difference either way, but thinking about it I'm not sure how it would improve fuel economy? The spacer allows the plenum to flow more air and more air equals more fuel? I did read somewhere that the two cylinders at the end of each bank closest to the front of the car can go a bit lean from the stock plenum design, so with a spacer you could get a safer, leaner tune, which would save fuel, but that's a bit of a stretch.

scathing Grand Master

scathing

Posted
Posted
I did read somewhere that the two cylinders at the end of each bank closest to the front of the car can go a bit lean from the stock plenum design

They run rich compared to the other cylinders.

The "280ps" lower intake runners are longer than the "300ps" runners, and with the way the upper plenum slopes down (and the fact that the air comes from the back of the engine bay) it means they get strangled.

The spacer gives more room for air to make it to the front of the plenum.

I doubt you'd save any noticable amount of fuel. They don't run that rich in terms of what comes out the exhaust pipes, or otherwise they'd fail emissions. Assuming the car's running perfectly in every other cylinder you're only running a little rich in 1/3 of your combustion volume. 1/3 of f**k all is still f**k all.

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

    • Black_CSR
      Wheel Sizes & Offsets For Skylines

      By Black_CSR · Posted

      Yeh I think i'll message an old contact i had for ages that manages his own tyre shop now.. n tell him what i want n work with him before ordering..  Got this 17x9 +30 Driftteks on 245/45/17 PSR Drag Radials on the rear.. They fit well - for your reference in future - Rear guards  have been lipped in & minimal to non flaring of the rear Gaurds.    
    • Kinkstaah
      Wheel Sizes & Offsets For Skylines

      By Kinkstaah · Posted

      If only it were that easy! I also needed to remove seats, shocks, brake calipers, send my car through a fence, and use measuring and ended up guessing because I didn't remove seats, shocks and brake calipers. It can be hard sometimes Can be a little more complex than 'just measure' if you want to truly measure the entire wheel through all of it's suspension travel. But if you aren't going for every last mm then yeah, you can check the space you currently have and guesstimate.
    • GTSBoy
      Wheel Sizes & Offsets For Skylines

      By GTSBoy · Posted

      If you own a car, and it has wheels on it, and you know the offset of those wheels, and you have a measuring device, you have everything you need to work out if other wheels will fit.
    • Black_CSR
      Wheel Sizes & Offsets For Skylines

      By Black_CSR · Posted

      Will this fit? but they are staggered set - RAYS 57DR SEMI GLOSS BLACK 18x8.5 +37 | 18x9.5 +38 5-114.3 STAGGERED SET   or If no go could just get a set 4's wheels of 18x8.5 +37 5-114.3 - would i run 8.5's 235s up front n 245's at the back if I do?   Thanks.        
    • MBS206
      MAJOR FUEL ISSUES 25det neo r32

      By MBS206 · Posted

      Put a clamp on your return line. I have a feeling it's sucking air, and introducing bubbles to your fuel. With a lot of fuel, less problematic. I'd honestly be redoing all the lines in the tank and clamps on everything.   Also, you've given two different answers to the same question: Asked if being followed by the police you could get down to use the whole tank, you said yes you could, so long as you keep off boost. However, you then followed this up that free revving, it would also cause the issues. I'm doubting free revving is enough to make any noticeable boost on what is likely a decent sized turbo.   So now I have to ask, can you actually drive it lightly and use all the fuel, or does it break up even free revving? Also, have you put a fuel pressure gauge on it? Can you hear the pump change noise at all when you're having this issue?
×
×
  • Create New...