tooter's next manifold adventure...

[RJay]

I suppose a flatter torque curve :) Longer runners give you that whilst shorter runners give you a bit extra horsies.
That's the theory at least. I know there are some cars with variable intake runners.

[tooter]

Originally Posted by RJay

I suppose a flatter torque curve :) Longer runners give you that whilst shorter runners give you a bit extra horsies.
That's the theory at least. I know there are some cars with variable intake runners.

You can see on this dyno chart exactly what 2 inch longer runners do. This is with the tooter II.VII spacer on my Toyota Tacoma.



Blue line is without the spacer, and the torque peak is 3,150rpm.
Red line is with the spacer, and the torque peak is 2,900 rpm.

Basically it moves the whole curve downward towards lower rpms as well as fattening up the curve a bit.



Tacoma manifold with spacer...




I'm expecting a similar effect on the Yaris when I dyno test it. How much, who knows? And that's what we'll find out.


Greg