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Rb20det - Modifying Stock Intake Manifold Thread

scrowetom
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scrowetom Newbie

scrowetom

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Posted

Hey guys & gals, this is my first post :cheers:

A little bit about myself before I get started. I'm 16, soon to be 17 and provisionally licensed. Looking at a R32 GTS-T as a first car. I've been surrounded by cars since I was born (Grandparents into rodding) so I do know how cars work, how engines work, suspension, brakes, upgrades etc.

However, I saw these images on a previous thread and they caught my attention. Due to the amount of controversy about RB20 intake manifolds and low torque due to shorter runners etc, these images really had me interested. If anyone could shed some light on the process of doing this, how hard, what is needed, if it's even worth it? That would be very very much appreciated.

YQID0V5.jpg

Pj8VN0B.jpg

scrowetom Newbie

scrowetom

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Posted

Cut up manifold.

Make parts to put throttle where you want it. Out of Aluminum.

Get weldded together.

Bolt onto engine.

Why. That's the question.

Mainly to reduce IC piping, cleaner engine bay, easier access to ignition, all whilst retaining the stock runners and plenum without suffering torque loss in the low end. Also, for that factory look. :P

Do you have a link to the thread for the first picture?

I'll swing you the link when I finish work man :)

  • 4 weeks later...
mad082 Grand Master

mad082

Posted
Posted

The one thing to consider with this is that you are taking an inlet manifold that is designed (by people who know a thing or 2 about airflow) to flow in the stock design and then pumping air in from a totally different direction. It might look tidier, and improve response by 0.0001 of a second because of there being a little bit less piping, but at what cost? You'll probably find that number 5 and 6 cylinders lean right out, while 1 and 2 run rich. And the best bit is that unless you hook up a wideband o2 sensor to each individual cylinder, you don't have any idea that it's happening until your engine pops.

And being around cars all your life doesn't mean you actually know how stuff works. What it means is that you may know a lot of information, but it doesn't mean that the information is correct.

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