2009+ 5.7 Hemi Eagle

Here is what Mike Doban at OST had to say when I asked him about the phaser position at rest and idle topic. His response is unedited.:

"Chris,
If you decide to go with an EFI Source unit let me know since I am a dealer/reseller for them. Unfortunately I do not believe that they have VVT control working at this time (unless something has changed in the last few weeks). To answer your question on the cam position at idle with the OCV valve disconnected/unpowered – I do not know for certain but I believe it may be dependent on the valve springs and the ability of the coil spring internal to the VVT system to return the cam to the lockpin position. I have yet to see a VVT engine (and I monitor all of them that come in for a tune now) stay at the lockpin postion at startup. This appears to be regardless of the oil or coolant temp. Now there is the possibility that the PID’s I am using to monitor the cam position are inaccurate.

So what I think is happening on most VVT cammed care with aftermarket springs is that at key off the cam phaser spring get the cam as close as it can to full advance. With stock springs this should be the lockpin location and absolute full advance. With aftermarket springs is it seems it is nearly full advance but can’t get all the way there without oil pressure and some RPM.

Regardless, we are documenting significant power gains with forced induction cars by moving the cam at WOT.

Hope this helps some?

Have a great day!
Mike"


He also said this:

"Chris,
I do not mind if you quote me but please include the fact that I do not know for certain what is occurring and that there are differing opinions.
I will give EFI a call today and see what the current situation is and if they have actually tested the VVT feature of the MS3 unit.

Have a great day!
Mike"