Aluminium piping. Is it a mistake or not?

cre · 04-29-2008, 01:57 AM

Forerunner to V-Tec and VVT-i. The manifold is designed in such a way that a large butterfly valve in the surge tank can be used to emulate long or short runners as needed. Without it your power below 4000RPM takes a hit. MKIII and MKIV N/A's both have this system. Other 7M-GE equipped engines (such as that from the Cressida) do not have it and it's part of the reason they make less power.

EDIT: You could of course go with a completely custom FFIM with multiple runners and valving such as the manifolds BMW used with a couple of their newer inline 6's... you're going to need one hell of a crew to help you calculate and cut everything to the precise lengths needed though... If you tipped the engine a decent amount you could build something similar to the old BMW manifolds, but it'll have to be tipped further to still accommodate the stock ACIS valving. BMW M3

04-29-2008, 01:57 AM	#8
cre Toyota Racing Development Join Date: Apr 2007 Posts: 5,038	Forerunner to V-Tec and VVT-i. The manifold is designed in such a way that a large butterfly valve in the surge tank can be used to emulate long or short runners as needed. Without it your power below 4000RPM takes a hit. MKIII and MKIV N/A's both have this system. Other 7M-GE equipped engines (such as that from the Cressida) do not have it and it's part of the reason they make less power. EDIT: You could of course go with a completely custom FFIM with multiple runners and valving such as the manifolds BMW used with a couple of their newer inline 6's... you're going to need one hell of a crew to help you calculate and cut everything to the precise lengths needed though... If you tipped the engine a decent amount you could build something similar to the old BMW manifolds, but it'll have to be tipped further to still accommodate the stock ACIS valving. BMW M3 Last edited by cre; 04-29-2008 at 02:03 AM.