vdi activation
01-07-05, 01:58 AM
#1
King of the Loop
Thread Starter
vdi activation
Ok when i posted my s5 manifold swap thread it was mentioned to have the vdi operated by and rpm switch. How does it activate? I assume its through the airpump. And at what rpms does it usually activate? I need to knwo so I know if I can use one rpm/pump to activate it alogn with my 5/6 ports or i need a seperate setup.
01-07-05, 02:50 AM
#3
I'm a boost creep...
Join Date: Jan 2002
Location: Auckland, New Zealand
Posts: 15,608
Likes: 0
Received 8 Likes
on
8 Posts
Operate it just like the stock set-up. The air pump supplies pressure to two solenoids, with one solenoid output connected to the VDI actuator and one solenoid output tee'd to the two 6PI actuators. The solenoids are each operated by an rpm switch. Look at the S5 NA vac routing diagram to see how it's all arranged.
The stock activation points are 3850rpm for the 6PI and 5200rpm for the VDI, but these points may not be ideal for a modded engine. The only way to tell for sure is to do two dyno runs; one with the auxiliary ports closed and one with them open. Where the two power curves cross is the ideal activation point. Then you repeat this process for the VDI.
The stock activation points are 3850rpm for the 6PI and 5200rpm for the VDI, but these points may not be ideal for a modded engine. The only way to tell for sure is to do two dyno runs; one with the auxiliary ports closed and one with them open. Where the two power curves cross is the ideal activation point. Then you repeat this process for the VDI.
Thread
Thread Starter
Forum
Replies
Last Post
