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Major Boost Creep

LANDSCRIBBLE
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LANDSCRIBBLE Mentor

LANDSCRIBBLE

Posted
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That hose on the TB goes to the charcoal canister aswell mate. I tried blocking that and the BOV hose off aswell as putting zero pre-load on the wastegate arm. STILL hitting 20psi in 3rd gear! Also noticed the whole actuator and bracket its bolted to shifts forwards a little bit when i give it some compressed air.

Thankfully Stao is sending me a 7psi actuator, i'll see how that goes.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

Also noticed the whole actuator and bracket its bolted to shifts forwards a little bit when i give it some compressed air.

It shouldn't move, flex a little perhaps but only at the end of its stroke. So if the wastegate flap isn't sticky then the bracket must be loose? Perhaps the bolts into the housing were a little too long and they bottomed out in the thread?

A 1 bar actuator should start opening at around 20psi using the compressor with no manifold pressure. Just thinking, if there is less restriction in the rear housing then the pressure would be lower, with less force pushing the puck open. Wouldn't that raise the boost threshold of the actuator a little anyway?

LANDSCRIBBLE Mentor

LANDSCRIBBLE

Posted
  • Author
Posted

It shouldn't move, flex a little perhaps but only at the end of its stroke. So if the wastegate flap isn't sticky then the bracket must be loose? Perhaps the bolts into the housing were a little too long and they bottomed out in the thread?

A 1 bar actuator should start opening at around 20psi using the compressor with no manifold pressure. Just thinking, if there is less restriction in the rear housing then the pressure would be lower, with less force pushing the puck open. Wouldn't that raise the boost threshold of the actuator a little anyway?

Yeah i probably didnt word it properly, its more like what you described. I checked that the bracket is on there and not budging.

  • 1 year later...
hypergear Grand Master

hypergear

Posted
Posted

Well. There has been many G3 and SS series been built through the year, the spec of the turbocharger varies, the internal gate assembly is matched to suit the application its designed for. Which not necessarily made for 14psi that can be rised using a EBC to reach 24psi.

Relating to the latest incident, it turned out the dump pipe bolts used are too long that fouled against the internal wastegate flapper. So its no longer spiking at uncontrollable boost level.

Regardless, if a turbocharger is made for a internally gated 280~300rwkws application then it is obvious that it will be running in between 18~20psi of boost.

If this turbocharger comes with a 20psi assembly then lowering boost level by change in actuator will not result in significant differences in the minimum boost level archived.

I can not use a 14psi internal gate assembly to hold 20psi nor using a 20psi internal gate assembly to run 14psi. In which the assembly it self has been setup for this purpose.

To clear the intention of purpose I do ask a lot of questions before proceeding in building any turbochargers.

Below is a demonstration of two different internal wastegate assemblies:

Purple is made for 14psi, made to run 20psi.

Blue is made for 20psi, did every thing possible to run at minimum boost level.

Orange is made for 20psi, run at 20psi.

boost.jpg

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