Jump to content
SAU Community

Recommended Posts

Hey Guys,

After another enjoyable day at WTAC, and hearing the gibson motorsport cars, can anyone explain to me why the HR31 sounds absolutly mental?

Is it all in the exhaust? (or lack of)

Looking in the bay obviously it has the GTS-R exhaust mani, but still has an internally gated turbo.

The note is different to pretty much any RB i've ever heard.

Could it be its maybe revving harder?

Link to comment
https://www.sau.com.au/forums/topic/433757-gibson-hr31/
Share on other sites

Yeah someone on the R31 Skyline club had a replica made. Can't remember who. Pretty much just get someone to make the longest equal length runners that will fit in the engine bay.

Yes the car is a GTS-R but the manifolds were made by Gibson (slightly different to GTS-R, sound is pretty much the same I believe). If you were to throw a GTS-R manifold on your RB, it would sound pretty much the same.

Link to comment
https://www.sau.com.au/forums/topic/433757-gibson-hr31/#findComment-7073840
Share on other sites

Why does it have a circular opening in the flange to the turbo ? Seems odd?

Also, the fact that the GTS-R and Gibson manifolds are tube not pipe, means the resonance from them will be different. If you want MAX banshee than tubular manifold will be the pick. not one out of pipe bends

Link to comment
https://www.sau.com.au/forums/topic/433757-gibson-hr31/#findComment-7074013
Share on other sites

Didn't the GRP A regs state that the exhaust manifold had to remain standard from the head to the first join? Hence the VL Walky had individual exhaust runners about 3-4"long from the head, after which the exhaust was free.

If that's the case, how would Gibson have homologated this manifold? Or did turbo engines have a different set of rules?

Link to comment
https://www.sau.com.au/forums/topic/433757-gibson-hr31/#findComment-7074058
Share on other sites

Didn't the GRP A regs state that the exhaust manifold had to remain standard from the head to the first join? Hence the VL Walky had individual exhaust runners about 3-4"long from the head, after which the exhaust was free.

If that's the case, how would Gibson have homologated this manifold? Or did turbo engines have a different set of rules?

They put the one they made in a Nissan box and showed the scrutineers. Not like any one knew what the cars had back in Japan anyway.

Link to comment
https://www.sau.com.au/forums/topic/433757-gibson-hr31/#findComment-7074131
Share on other sites

  • 3 weeks later...
  • 2 weeks later...

And make a 4 inch side pipe as well.

Was amazing watching Skaife race one eariler in the year at PI Historics.

Coming out of the final turn and flat shifting down the straight... eargasm!

Sure was a great day.

You can't compare the Gibson to any other manifold, it is made from a special material with sand bent one piece runners. I can try and get some manifold pics next year at PI if you like, all the Gibson cars are together in the pits.

post-63525-0-36808500-1384730407_thumb.jpg

post-63525-0-45866700-1384730560_thumb.jpg

Link to comment
https://www.sau.com.au/forums/topic/433757-gibson-hr31/#findComment-7111241
Share on other sites

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


  • Similar Content

  • Latest Posts

    • 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.    
    • 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.
    • 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.
    • 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.        
    • 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...