David is it a hot or a cold start issue that you are having ? I understood it was when the car is cold witch We had never ran into a cold start issue before, might not be a bad idea to verify the fuel pump install and even checking base fuel press, The map i sent you was based on 18 Celsius coolant temp starting problem.

Let me know.

Sam

Sorry I couldn't come out last night. Hope you still had a chance to log more data!

No prob Jeff. I have done a few runs. I have been monitoring boost. the vaccum stays at -20 until i get on it and boost goes up to a pinch under 9 psi. So far the car is running well. I'm having to learn to drive the car all over again with this much torque and power. I've seen the VDC go off as much in the last week as I have in my whole life of owning cars with VDC.

My power steering is groaning ever so slightly. I think I have a small kink in the return line from the power steering pump to the resevoir. I'm going to put a new hose on ther eand see if that helps. My theory is that if fluid cant be pushed out enough then that can cause the groan.

Well. I put in the forged bypass valve with 3 different springs. Still fluttering. I tried extending the hose, That helped a little but not solved.

Damn, I was hoping the Forged bypass valve would solve the problem.

damn sorry to hear...hopefully Sam comes up with a fix as his car has absolutely no flutter whatsoever..

Damn, sorry to hear that. Thanks for the info, though.

Yeah. Sam is working on the fix after sema this week

Thought I'd try and see if it work

http://i212.photobucket.com/albums/c...l/56190959.jpg

http://i212.photobucket.com/albums/c...l/2f54d42a.jpg

http://i212.photobucket.com/albums/c...l/4b045a85.jpg

http://i212.photobucket.com/albums/c...l/1f94544f.jpg

Is that what slightly helped?

yes it is. It helped a little, but its still there.

Are you building any boost when the fluttering occurs? Maybe a softer spring than what comes with the Forge DV might help.

Did you noticed any changes on the low end after installing the new bypass valve? Like your idling being more jumpy and does it backfires?

The fluttering is happening between -5vac to 0...it happens in decel, shifts, and when your on the throttle about 5-15%. I originally thought it was more but its not. Any more than that and its gone once boost starts to build.

Most likely its a positioning thing. The fact that he reduced it a bit by adding the longer tube kind-of tells me a dual setup or one up by the TBs would do the trick.

Whats important here is that drivability, power delivery, and the overall tune is as OEM feeling as you can get!

Can the bpv spring might be too soft if it's bypassing during acceleration. possibly?