I've used two different Tial 38mm wastegates but my boost always increases with each gear I'm in. I run 8psi. 1st gear sees about 2.5psi, 2nd gear gets 6.5psi and 3rd gear gets 8psi. I keep seeing folks get full boost in each gear. How do I do this? I don't have leaks anyway. I'm told I need a different wastegate to match my system more. I've also been told to put on a pressure regulator to the wastegate.

What do you other STS folks get in each gear?

 

Where do you get your boost reference signal from? The scroll of the turbo housing or your intake manifold?
I had similar issues before I plumbed into my intake. I don't know if the Dodge has a port you can tap into or not. The Chevy has one on the back passenger side of the intake manifold.
I still get a little creep as I go through the gears though. About 1.5 psi max.

 

I have the STS Boost Control. It works on the wastegate spring for the low setting and has a control that you set manually for the high setting and can control electrically from the cab.

On the low setting I get 5 psi from around 3000 rpm and up under WOT. For the high setting I am using 10 psi and it works the same as the 5 psi setting getting 10 psi from around 3000 rpm and up under WOT.

The low setting depends on the spring you are using in the wastegate and the source of your boost reference to the wastegate. With the red .4 bar spring in the wastegate the turbo would overboost and give me from 5 psi at 3000 rpm to around 10 psi at the shift. I switched out to the yellow .3 bar spring and it brought the boost down to a pretty consistent 5 spi from 3000 rpm and up at WOT. Mine works with the boost reference near the outlet end of the compressor horn. I tried the boost reference near the inlet end of the compressor horn but it did not work well. It did get the max boost down to around 5 psi with the red spring but would drop off to below 2 psi at the shift.

Make sure that your boost reference tubing is in good shape and not leaking. Check your wastegate to make sure it is not full of water, that the diaphram is not punctured and that it moves freely.

Good luck getting it working properly.

 

It's probably NOT the wastegate, or even a wastegate issue. More than likely it's the fly-by-wire throttle closing due to torque management in the PCM. You can't make boost if the throttle closes! I have no idea how you'll defeat it either.

 

My boost reference location is off the engine vacuum so it's as strong as it can get. This has been an issue since day one with the kit, even when everything was 100% new. My exhaust is all welded so I know there isn't a leak. I put a 3.5psi wg spring in and in 3rd gear, I see the 3.5psi. In high boost, I goto 8psi with the elec boost controller. 3rd gear will see that high boost. 1st gear hardly ever sees much boost. I know the hemi trucks are all about the same with this and figured it was the wg head vs. the turbo head match up. On the turbonetics site, they talked about "boost creep" and say their racegate eliminates that. I'd hate to spend the money on a wg and it not fix it.

So you think it's the fly by wire? I had thought about that but if the throttleplate was closed then I shouldn't be accelerating in such a fashion.

 

Also, it's consistent. In low boost, 3.5 max, I get about 1psi in 1st gear, 2psi in 2nd gear and 3.5psi in 3rd gear. In high boost, max 8psi, I get about 2 to 3 in 1st gear, 6.5 in 2nd gear and 8psi in 3rd gear. Makes me think it's engine load vs. vacuum vs. wg.

 

I don't think its the wastegate, it sounds like it might be your fly by wire or something holding the engine back under load. I know there is allot of talk about the Dodge's computer not letting bolt ons and such make the power they should be.
Maybe its a similar issue with the turbo, except past a point the computer management cannot disregard the manifold pressure.
Question... how do you tune for the turbo being installed if the Dodge's computer is such and anti-horsepower ****? I have heard so many bad things about it.
Not ripping just wondering.
From what you say it sounds like the computer is pulling timing, AKA Torque Management.

I should have read your first post a little closer, I was thinking you were getting boost creep not under boost.
I was getting boost creep and still do, about 1.5 psi like I stated above. Sorry for the confusion.

 

My money's on the fly by wire and torque management too. Just because it's not fully open, doesn't mean your not getting larger amounts of air though it with the turbo pushing it. On my truck, I can make full boost at about 3/4 or less throttle in some conditions, and there is no really noticeable difference from there to WOT (the motor can't flow any more air). The throttle blade becomes less of a linear air flow controller with a turbo.

 

I hate being a Dodge man when it comes to the pcm's. They really send it to us up the azzzzzz. But to answer your question, I use an smt6 piggyback to intercept map voltages and to manage fuel. Tq management has been eliminated by sending the tq management request wire to ground. So it's not tq management and I have an autoxray 6000 scanner that monitors timing (and everything else) and it's not timing retard or knock sensors picking up anything. From an engine standpoint, everything appears normal.

I'm told I don't have the engine load demand in 1st and 2nd as I do 3rd gear. And I understand that. Maybe the entire kit design doesn't match the truck???? KRC performance just put their own custom turbo on an '04 Hemi Ram and they get full boost in every gear. They told me to call Turbonetics and chat with them about WG designs which is why I'm on the wg kick.

 

I've also been told my boost controller could be hampering things. I have the standard manual turn boost controller. Upgrading to a solenoid model helps prevent boost creep as well.