JDM Throttle body, where do I run my fpu vsv hoses?
- Thread starter Supraflymk3
- Start date
http://www.cygnusx1.net/Supra/Library/EPC/291420/catalog.aspx?F=1708&P=3
The source is the big port next to the iacv
The source is the big port next to the iacv
That large port is gonna have vacuum at start up I thought it was supposed to have no vacuum at start up. The large port is for p.s.
How can it have no vacuum upon start if it's connected directly to the intake manifold?
In the factory configuration the FPU VSV is connected to the vacuum manifold with its source being the large port. When active the three way VSV prevents vacuum from reaching the FPR while at the same time venting its diaphragm to atmosphere thus increasing fuel pressure. That happens for about two minutes max and only then under certain conditions.
The PS idle up is also connected to the vacuum manifold. Control of that function is done by a hydraulically activated VSV mounted on the PS pump.
In the factory configuration the FPU VSV is connected to the vacuum manifold with its source being the large port. When active the three way VSV prevents vacuum from reaching the FPR while at the same time venting its diaphragm to atmosphere thus increasing fuel pressure. That happens for about two minutes max and only then under certain conditions.
The PS idle up is also connected to the vacuum manifold. Control of that function is done by a hydraulically activated VSV mounted on the PS pump.