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How Much Will Stock Gtr Dump Pipes Flow?

6InlineTT
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6InlineTT Collaborator

6InlineTT

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So I am havingbserious trouble fitting aftermarket split dump pipes to my rb26.

long story short, the front dump elbow doesnt clear the rear turbo inlet pipe.

so, I have noticed people saying that the stock,dumps flow well and alot of people saying they are shite. Now my theory is that they will flow alot more than people think.

Yes they dont look pretty inside but they made a healthy 312awkw for me with a 3inch exhaust.

I am currently puttingnmy new setup together.

hks 2540s

ARC intercooler 70mm

hks super dragger 3.5inch exhaust.

e85

now rather than spending $500-800 on dump pipes I may not need. Can anybody vouch them? I am looking to make 370awkw maybe more but im not fussed on a number. Just want to enjoy the car.

so has anyone made 370awkw or close on stock dumps.?

Cheers

Blake

Ps. I trawled threads but didnt find anything conclusive enough to make the D

6InlineTT Collaborator

6InlineTT

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yeah Im aware of the hks 2540s being mismatched etc. But honestly I dont mind the lag at all.

so Piggaz, you say u made 412awkw on stock dumps?

76mm seems prettt excessive for 1.3L of airflow. I would almost say you would lose velocity with pipes that large at my power level.

my 400+rwkw xr6turbo is only running a single 75mmmm dump with internal gate.

basically after lunching my xr6ts gearbox im low on cash and am hoping to get away without spending too much on extra stuff like dumps.

at the moment I cant see enough evidence to suggest that I need afternarket dumps. but thanks for the input. keep it coming

Piggaz Grand Master

Piggaz

Posted
Posted

yeah Im aware of the hks 2540s being mismatched etc. But honestly I dont mind the lag at all.

so Piggaz, you say u made 412awkw on stock dumps?

76mm seems prettt excessive for 1.3L of airflow. I would almost say you would lose velocity with pipes that large at my power level.

my 400+rwkw xr6turbo is only running a single 75mmmm dump with internal gate.

basically after lunching my xr6ts gearbox im low on cash and am hoping to get away without spending too much on extra stuff like dumps.

at the moment I cant see enough evidence to suggest that I need afternarket dumps. but thanks for the input. keep it coming

412 on split dumps.

Dumps are not expensive, a set of HPI units and job done.

XKLABA Grand Master

XKLABA

Posted
Posted

Depends on what factory dump pipes you have, they are all different and the 32 ones will struggle to flow 370kw, the 33 and 34 ones will be a restriction at that power aswell just not as much as the 32 ones, that said you can blow a golf ball through a length of garden hose if you blow hard enough :P

6InlineTT Collaborator

6InlineTT

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Well the reason I questioned it is that my xr6turbo flows over 400rwkw with a single internally gated gt3540 and a 3.5inch dump. That's 4L single with a single 3.5inch dump vs 2.6L at similar power with twin 3inch dumps? That just seems a little excessive to me.

I have hks mid pipes and hks 3.5catback so I am going to spend the money elsewhere and post my results. After all, I'm not chasing every last Kw and it's more money for things like oil separators and things I'll need later.

Thanks for the inputs

Blake

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