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

    • It will sound tragic and you wished you didn't have 1x exhaust per turbo. There's a reason why most S55 owners change to a single mid pipe.
    • Echo the comments about the well preserved condition it's in. It has the aero bumper too for extra points. Nice car, and please keep it like that! 馃檪
    • 1. There are no real performance benefits. It sounds different, and as the pipes are not as large diameter you can claw back some undercar clearance or run lower (if that's your thing). 2. Twin pipes, offering exactly the same cross sectional area as a single pipe** will have higher pressure drop - so will not flow as well. That's because there is more surface area of wall per cross sectional pipe area, hence more frictional losses. ** But of course, it is almost impossible to get 2 pipes that are exactly the same XS area as a given typical single pipe. eg, 2x2" is not the same as 1x 3", although it is close. If the 2x pipes add up to less XS area than the single - it will just be flat out worse. If the 2x pipes add up to a bit more than the single, then it might come out as a wash. If the 2x pipes are substantially more XS area than the single, then it will probably flow a little better. 3. No. Why would there be? What have cats got to do with boost creep?*** ***But for f**ks' sake, please run a cat. 4. If you want.
    • UPDATE: was able to have the bracket repaired and base repaired, seat is like new now ;)
    • I was going to say it looks right out of Gran Turismo photoshoot when you just buy the car. (in a good way)
  • Create New...