Quote:
Originally Posted by Irace86.2.0
Cliff notes:
Preload can’t reduce boost below wastegate spring pressure; it can only raise it above spring pressure. At best, rod length could be set to allow the wastegate to be cracked, but this will only raise boost threshold and turbo lag.
You have boost cut set at 15psi, and you are seeing this max boost, which means without the fuel/throttle cut, you could possibly see even more boost. The most likely scenario is the wastegate isn't opening. This is most often caused by a leak from a cracked, damaged or popped-off vacuum hose going from the turbo compressor to the wastegate. Make sure that is secure.
If the hose is solid then determine if this is a boost spike, boost creep, or if it truly is that the turbo is spinning freely to 15+ psi. A spike could be from routing the vacuum line from the intake manifold to the wastegate instead of directly from the turbo compressor housing or from excessive preload. Too high of boost is from a wastegate door sticking shut from mechanical damage or very excessive preload. Boost creep is from an undersized wastegate for the engine/turbo, which is highly unlikely because this is an off the shelf kit.
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I wish I knew a bit more about how the tuning aspect worked
this is what my tuner said!!