Performance manifolds

[chrisl]

Originally Posted by Kostamojen

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

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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[ft_sjo]

Originally Posted by chrisl

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.

[wparsons]

Originally Posted by Anthony

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

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.

[Anthony]

Originally Posted by wparsons

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.

[Kostamojen]

Originally Posted by chrisl

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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[wparsons]

Originally Posted by Anthony

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.

[Nitro_FRS]

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