Janspeed manifolds - Worth the money?

[easytime]

'It's not adding power to the engine, but it doesn't rob to much ether.'

What you have just said is that the JS rob power?

[Fred68]

Originally Posted by easytime

'It's not adding power to the engine, but it doesn't rob to much ether.'

What you have just said is that the JS rob power?

Pretty much anything that is bolted to the exhaust or inlet ports of an engine will loose torque.
A correctly designed manifold will or can cause a vacuum in the exhaust port. This vacuum will draw extra air into the cylinder via inlet valve. This does add torque over and above that, that is generated by open ports.
This extraction only works for a set design of manifold. Any other type of compromised designed does in fact loose torque, when compared to open ports.
The JS manifold is much better in terms of flow over the standard manifold. This is why there is a torque gain.
It's not the last word in extraction manifolds for the KV6 though.

[redzed]

heres a very bad quality vid of the sound of my zs with janspeeds. http://s1363.photobucket.com/user/ia...250d5.mp4.html

all i have is a induction kit and janspeeds (not been remapped and is on standard cams) and its rolling roaded at 175bhp @ the wheels (190-210bhp at fly depending on how its guessed ;-) ), which is not a bad amount of power

[easytime]

Originally Posted by redzed

heres a very bad quality vid of the sound of my zs with janspeeds. http://s1363.photobucket.com/user/ia...250d5.mp4.html

all i have is a induction kit and janspeeds (not been remapped and is on standard cams) and its rolling roaded at 175bhp @ the wheels (190-210bhp at fly depending on how its guessed ;-) ), which is not a bad amount of power

I have an iTg, JS manis and cat back system twin exit, would love to know how much that makes. I did have a decat but she felt really flat with it so the cat went back on.

[easytime]

Originally Posted by Fred68

Pretty much anything that is bolted to the exhaust or inlet ports of an engine will loose torque.
A correctly designed manifold will or can cause a vacuum in the exhaust port. This vacuum will draw extra air into the cylinder via inlet valve. This does add torque over and above that, that is generated by open ports.
This extraction only works for a set design of manifold. Any other type of compromised designed does in fact loose torque, when compared to open ports.
The JS manifold is much better in terms of flow over the standard manifold. This is why there is a torque gain.
It's not the last word in extraction manifolds for the KV6 though.

Right ok, so I should have a net improvement over the MGR units with my JS manis?

[redzed]

Originally Posted by easytime

Right ok, so I should have a net improvement over the MGR units with my JS manis?

Definately