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Exhaust Diameter For High Powered RB26

Shaun

By Shaun,
in Engines & Forced Induction

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Shaun Mentor

Shaun

Posted
  • Author
Posted

Dunno Paul, just a personal thing i suppose. This will be the last exhaust i ever put on the car, so i want it to last. And sometimes i get under the car and make it all shiney again. Is that weird?

Give Peter a ring at Advan, they get some great TRUST front pipe copies made up...you would be hard pressed to tell the difference!

P.S. why do you want stainless?

Cubes Grand Master

Cubes

Posted
Posted

I'm welding up my own mild steel job that runs a 3.5" dump/front pipe in to a 3.5" cat, from the cat runs a 3.5" pipe in to a 3.5" Magnaflow muffler that splits the flow in to 2 x 2.5" pipes.

Then from the intermediate muffler 2 x 2.5" pipes will run to the back of the car in to a 2 x 2.5" inlet and outlet magnaflow muffler.

2 x 2.5" nice little exhaust tips and it will be quieter than a single 3.5" flow slightly better and won't look like a damn Milotin. ;)

Magnaflow also make a 4" in that splits in to 2 x 3" out.

That would flow damn well. :rofl:

Generally Aus exhausts from my experience are crap. I had a $1660 D&T Performance exhaust made up that was absolutely sh*t house.

The dump pipe has massive slags splattered inside not to mention how the pipe wasn't stretched properly to mate up with the lower part of the flange, resulting in a 15mm V shape exhaust flow protruding lump smack in front of the compressor wheel. :P

Its been around 3years, now all the welds are rusting, but its s/steel?!??! :(

a s s h o l e s

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Depends on the setup... a few scenarios, using 350rwkw

a) if you are using an EXT Gate and plan to plumb it back 4" regardless

B) if you are using an EXT Gate and keeping it atmo... 3.5" would be pretty reasonable if your tight in cash, it would give you enough otherwise 4" if you ahve the bling bling

c) if its all int gated and stuff (read:nasty sh|t) then 4" regardless

As for WetGTR, from what ive taken in, the CAMS and stuff will be allowing you to do that power with the 3" as they are forcing it.

Put on a 3.5", or even a 4" as im sure ben has told you... and it would be VERY interesting to see the power difference which should be very notceable.

PS. Racepace custom turbos are the shiznit ;)

Guest two.06l

Guest two.06l

Posted
Posted
Dunno Paul, just a personal thing i suppose. This will be the last exhaust i ever put on the car, so i want it to last. And sometimes i get under the car and make it all shiney again. Is that weird?

Weird....thats nuts!! But then again our TRUST 4" has got cat guts splattered all over it!

Shaun Mentor

Shaun

Posted
  • Author
Posted
Depends on the setup... a few scenarios, using 350rwkw

a) if you are using an EXT Gate and plan to plumb it back  4" regardless  

B) if you are using an EXT Gate and keeping it atmo... 3.5" would be pretty reasonable if your tight in cash, it would give you enough otherwise 4" if you ahve the bling bling

c) if its all int gated and stuff (read:nasty sh|t) then 4" regardless

As for WetGTR, from what ive taken in, the CAMS and stuff will be allowing you to do that power with the 3" as they are forcing it.

Put on a 3.5", or even a 4" as im sure ben has told you... and it would be VERY interesting to see the power difference which should be very notceable.

PS. Racepace custom turbos are the shiznit :rofl:

Yeah, ill be venting external wastegate to atmosphere, but if i get sick of that (or defected) i'd like to be able to dump it into the exhaust pipe at a later date.

Im actually having a hard time finding a 4 inch (101mm) stainless exhaust for my r32. I like the Apexi, but the N1 evolution goes from 85mm near the cat to 95mm towards the rear!!??? Apexi do a true 100mm exhaust, but not for the R32 anymore.

BTW, its $1100 for a cat back stainless Apexi, and $1700 for a cat back MILD Trust. WTF!

Shaun.

WetGTR Proficient

WetGTR

Posted
Posted
Depends on the setup... a few scenarios, using 350rwkw

a) if you are using an EXT Gate and plan to plumb it back  4" regardless  

B) if you are using an EXT Gate and keeping it atmo... 3.5" would be pretty reasonable if your tight in cash, it would give you enough otherwise 4" if you ahve the bling bling

c) if its all int gated and stuff (read:nasty sh|t) then 4" regardless

As for WetGTR, from what ive taken in, the CAMS and stuff will be allowing you to do that power with the 3" as they are forcing it.

Put on a 3.5", or even a 4" as im sure ben has told you... and it would be VERY interesting to see the power difference which should be very notceable.

PS. Racepace custom turbos are the shiznit :rofl:

Yep your right R31Nismoid!

Ben did tell me that the exhaust system is becoming a restrictive point in my system. I'm now in the process of installing a HKS Super Dragger Muffler which is 3.5" and will have my EXT Gate vent to amto.

Wanted to go a 4" system but when you have the 3.5" HKS Muffler but sitting there doing nothing at my brothers place (was to be a future project of a Supra) , thought I use that and see what the results are.

I can tell you that atm I have 412awkw with a 3" system, then if the ext gate vents to atmo, I get 417awkw.

I hope the 3.5" system takes my power levels a little further. I will post up the results once completed.

R32-GTS Mentor

R32-GTS

Posted
Posted
The following modifications are as follows:

RB26 ENGINE

HKS 88MM FORGED PISTONS

HKS CON RODS

HKS STEP 2 280 CAMSHAFTS

HKS CAM GEARS

HKS 1.6MM HEADGASKET

JUN OIL PUMP

PERFORMANCE METALCRAFT 8L RACING SUMP

PORTED HEAD

NISMO BEARINGS

NISMO CAMBELT

AUTRONIC SMC AND LOOM

1000CC INJECTORS

BLITZ FUEL RAIL

MALPASSI FUEL REG

SPLITFIRE COIL PACKS

GARRET BALL BEARING TURBO(NEW T04Z) - RACEPACE CUSTOM

RACEPACE CUSTOM  EXHAUST MANIFOLD

TRUST EXTERNAL WASTEGATE

NISMO G-MAX TWIN PLATE CLUTCH

HKS GT SPEC DRAG INTERCOOLER

CUSTOM FUEL SWIRL POT - TWIN OUTLETS FED BY GTR FUEL PUMP

2 X BOSCH 044 EXTERNAL FUEL PUMPS

HKS OIL COOLER KIT

TRUST EXHAUST 3"

ARC ALLOY RADIATOR

ARC OIL CATCH TANK

HKS EVC4

HKS COLD AIR INTAKE

TUNED BY BEN @ RACEPACE MELBOURNE

CURRENTLY MAKING 417KW@THE WHEELS AT 1.3 BAR

WAS MAKING OVER 500KW WITH PREVIOUSLY FITTED HKS T51R

This is almost the exact same combination that i have put together. Will be interesting to see what it does on the dyno next week. I will keep you posted. Only thing that i can see is different is you have used 280 degree cams where i used 272 .

Ronin 09 Grand Master

Ronin 09

Posted
Posted
I would highly reccomend a Trust TR (they are 3.75 inch i think) they fit the bill for your requirements except for the stainless steel part which is really nothing major. The silencer system they have is very effective and they make room for large power increases.

Advan Perfromance in Silverwater stock them - 9647 1326

I have this. Got it from Nengun.

It is pretty loud... but tough sounding with the cams :)

It's a bit much for daily driving, and particularly highway work

nice on the track though

GTR0006.JPG

GTR0036.JPG

Shaun Mentor

Shaun

Posted
  • Author
Posted

How much was it? Is it the Trust TR. Is that all you got or did it come with the rest of the exhaust (cat back including silencer and cat replacement pipe)? Im really interested to know becuase ill consider doing this as well.

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