I know one side is easy to install, the other I believe there is something in the way that needs to be moved so adds some time. I dont think its hard per say but if you dont have a good set of tools to encounter any hiccup Id get them installed.

I need to get them myself also. But this may be an issue with the stock ones sticking, the modded VTGs should have come with them from the get go. Try those and let me know how she does.

 

What are your IAT's?

 

I do not think I have these readings. I am about to give up and put my ECU back to stock.

 

I think I know what you are talking about. Does it happen mostly in 5th or 6th gear in sport mode? When you pin the throttle, the RPM starts to rise and the car starts to pull, but you hit about 4500 rpm and you feel a flat spot in the RPM before it starts to pull again?

I have had a few conversations with EVOMS about this. The ECU is pulling back for either high intake temps or poor fuel quality. I don't have bigger IC's, so I can't tell you with any conviction that it would solve the issue. I will say that after I started running 100 octane, there is no hesitation or flat spot in the RPM range at WOT.

 

It does it in all gears i tried, 2, 3 & 4. If you had to go to a higher octane it maybe a timing issue then... at this point i am not sure. I made a decision yesterday to take it back to stock because it drove fine i know i may have more power now it is not useful unless the car feels good to me.

 

Same flat spot here at 38ºC=100,5ºF, mod. ecu.

 

My older unit is fine in 100+ humid weather. Lots of A/C condensation when I park. Slightly less power...nothing I'd notice if not on a track. Torque feels fine. I have lowly k16 spinners.


Jeff

 

What tune do you have? how is the humidity?

 

the BRV sounds like the logical culprit. You could have a split (even slight) in the diaphragm losing boost or getting stuck which is throwing the psi regulation off.

Replace the BRVs and see what happens.

 

I will be doing that next.

 

Ruf 550+IPD plenun and Cargraphic headers. Humidity is quite low here in Madrid, Spain. About to install BRVs too

 

Got those in stock if you need

http://www.sharkwerks.com/products.php?pid=170

 

Are you near the Mediterranean? the breeze is a bit misty and as far as i know it is good for the turbos. From what I am learning so far, have someone check your tune, see where your timing and fuel curb is.

 

I have a few things to clean up... long list...

 

Before you go spending money on anything, have you talked to Dan at Vivid or Scott at Softronic?

Stock BRVs are found on many applications with higher horsepower. It should not cause your symptoms at high temperatures and humidity, and not so in lower temperatures. They do not seem to be prone to failure like the diverter valves on the 996TT. Your issue sounds more related to your tune. Collect some data...find out what IATs your engine is seeing...what is your AFR? Talk to the guys that did your programming.