also, it's imperative that both start points on the threads are equal left/right before adjustments are incrementally made in that 1/4 turn method. or else there will be inequal opening btw the two. that *might* seem obvious, but you'd be amazed lol

 

Good point Mark, I like to pressure balance the two WG as well, common pressure source with a splitter/hoses to each WG, visually see both crack at same time

 

excellent point(s).

 

too much tension, ie shortening the rod or tightening it makes more boost.

When the actuator gets boost pressure from its line, the rod moves out thus opening the flap and bypassing the turbine.

When you shorten the rod or shim it, it pulls out some of the initial travel thus postponing when the flap opens.

So proper adjustment and synchronization are key.

The idea I had was the constant here is the person, not the parts. So in theory you could install 47 thousand wastegate, but without proper set up, none will work.

So many things have been changed at this point with little to no effect...the flap on the wastegate leaking or being open would result in little differences by replacing those other parts.

 

Thanks for all the input guys. Unfortunately pretty much everything mentioned I have checked and double checked. Not only did I tighten the actuator rods, disable the actuators I also wired them shut so the physically can't open.

If there is an issue with the wastegate then it's a broken flap but I checked them the last time I swapped turbos and they looked fine.

I'm going to look into the TB not opening all the way next week and I'll report back.

I appreciate all the help!

 

W/G adjustment and balance is indeed important. However he has disconnected the vac signal to the cans which ought to rule that out as he's said above. I'm betting and hoping it's the throttle plate not fully opening at this point

 

Still wouldn't matter with vac hose disconnected if it was too loose.

On the other hand I have had TB failure, in fact I think I gave it again. Haven't had time to look at it yet.

But I have tons of codes.

 

Log your "actual value throttle" position during a WOT pull. Your ECU will close the throttle to approximately 30% open when over boosting is sensed. You might have been over boosting all along and your ECU is protecting your engine.

 

this!

 

Do you have a Durametric to log?
What's your elevation ?

 

Hi Markski,
Yes I do. I am off on Wednesday so I hope to try some stuff and do some logs to post up that day. I am pretty much at sea level.

 

Have you sent the logs to your tuner ? Maybe the wgs are set up too soft. Maybe the n75 duty cycle needs to be turned up.

 

I did send him some logs but they only had the following perameters:
RPM
Load
B1 Lamda
Boost Pressure
Set Point boost Pressure


I think the fact that I wired the wastegate actuators shut and that made no difference eliminates these posibilities. The only thing I can think of is if the flapper on one of the turbos is broken but if it is it is not apperent since I looked at them the last time I had the exhaust off.

 

Log p/d factor of boost pressure. That's ur n75 %. Let's see what happens

 

Awesome. I will do that and let ya know.