Performance manifolds
 

Ive seen pictures of a performance tubular Intake manifold on the FRS/BRZ. However doing all of this searching I am unable to locate or source this manifold. I have no idea who manufactures it or if its a custom piece. Anybody know?

Also has anybody done dyno testing with the different exhaust manifolds to see which produces the most performance output over all of the others? Not looking for full exhaust setups JUST the headers.

Motiv Concepts was working on an intake manifold at one point, it might be custom made though. we never got any updates from them on the progress.

It would be nice if someone released an intake manifold and throttle body that was both effective and affordable. HKS can keep theirs.

You guys are dreaming if you think a new common-plenum inlet manifold is going to release noticeable power from this engine.

This isn't some 1980's hunk of iron designed in a shed by peasant farmers.

If you want power from this engine, look at the ports, get appropriate ITB's and exhaust system and make it spin faster. The end.

Idk, the MRs seemed to benefit from intake manifolds and it wasn't designed by peasant farmers....

I don't really expect one to come out any time soon. And when they do start coming out, I don't expect their cost:gains ratio to be good enough for me to seriously consider. That's why I said it would be nice if one was effective and affordable.

Besides, by the time that day comes, it'll probably be way too easy to go FI anyway.

They came with 100hp/litre engines too, right?

Exactly. See the SYMs wagons for an excellent example:

"Built at a reported cost of $250,000 each, these Impreza wagons were powered by a normally aspirated 2-liter EJ20 engine featuring roller barrel throttle bodies fed by a carbon fiber airbox and dry sump system. Internals were a closely guarded secret, but output was 300 hp at 8,200 rpm. Moved back for better weight distribution, the FR layout was mated to a sequential transmission, with a BMW diff driving the rear wheels."

http://superchargercalculators.blogs...on-to.html?m=1

All's well and good, but then you calculate the cost and ITBs + internals for high rpm operation end up costing more than a turbokit. People don't want power, they want cheap power.

Pretty sure 180/1.8 is the same as 200/2 but my math skills are slipping.


Don't know much about Hondas but I've heard even the legendary k20 got power from intake manifold changes.

Now, don't get me wrong I'm not saying we'll get 20whp out of one but more power is possible.

Guess I missed the part where 6k was cheap for a small turbo ...

Shoot, my b20z/vtec got great gains from a skunk2 IM and 68mm TB. Especially after port matching, thermal gasket (over stock).

AVO kit is 4k...

Has anybody done a flow test of the intake manifold versus the rest of the engine? Subarus are known to flow quite well stock on the intake side of the engine.

That number seems a little suspect to me, even for a racing engine - they'd need to be making 192ft-lb at 8200 to pull that off, which seems too high for a n/a 2L. Sure, you can absolutely make a 300hp n/a 2L racing engine, but I'd expect it to make less torque than that and rev a bit higher instead.

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On pump fuel I'd agree, but may be possible with race fuel.

Why is everyone bringing up the TB?? The stock TB on these engines is already huge (bigger than most people upgrade other 2L engines to!), you won't see gains from going bigger until you're making a lot more HP.

Because a hypothetical throttle body that would be effective would be effective.

TB's aren't magical black boxes, they just let air through. If the hole is big enough for the air the engine needs going bigger won't do anything to increase performance.

A bigger TB will feel faster at part throttle because it will let more air in at a given throttle plate angle, but at WOT it won't make a difference.

I guess ill just have my buddy build a tubular intake for me if it isnt available.