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's almost certainly a reluctor generating an "AC" waveform. No, ECUs don't generally read those - they're usually set up for PWM square wave 0-5v stuff.
    • Working through possible solutions of converting my mechanical speedo.    Anyone know what type of speedo sensor the factory r34 gtr getrag has ? what the output is ? I assume its not a VSS and more a voltage like earlier speedo sensors ? Can an ECU read it ?  
    • roof rail delete used to be a thing, they were made locally for a while too
    • I can get more photos of it here soon and I plan to make a thread detailing the process. I received the car this way and it sorely needs refinishing. That is probably the most appealing photo of it. Up close it is fading, cracked, and needs to be re-glued. Depending on their condition I'm on the fence between refinishing or making a new set.  Another angle hiding the pimples and razor pumps  
    • According to this thread the RS4V with build plate RC40 comes with the R200 diff @ 4.083 ratio as well (mine has said RC40 denotation). We may need to check if the axle stubs are the same pattern as well. The auto subframes have longer axles. However I think yours being a later Series 2 as well, we should have the same bolt pattern for the diff stubs. Unless your upgraded rear also has upgraded axles. Either way, I would not be opposed to pulling the covers to check so I can inspect that  fancy rear core  Also I don't have HICAS. I don't believe that should change things but I hope the people here with heaps more experience than me can correct me if I'm wrong   Let me know if you want to attempt to make this work and I can get some pictures of mine from under the car. 
×
×
  • Create New...