does wastegate max travel affects presure?
I've been running a billet wastegate actuator on my TD04HL-16T for a few months and can't get boost past 9 psi, no matter what spring or preload I use. It always falls off at mid to high RPM.
When I compared it to the stock actuator, I noticed the stock one only has about 10 mm of travel, while the billet one has around 15–20 mm. Could the extra travel be causing the wastegate to open too far and bleed off boost?
I've tried different springs, different preload settings, and even stock preload specs with no change.
My thought was to use a lighter spring and shorten the rod as much as possible so the wastegate can't open as far, while still keeping the correct preload. Does that make sense, or am I looking at this the wrong way?
Or is the ECU simply commanding the TCV to open the wastegate more for some other reason?
Car: 1996 Volvo 850 T5, almost Stage 0.
- Only codes are for bad ABS sensor readings.
- radiator is leaking (idk if it pulls timing for this)
- Turbo was rebuilt (not sure what was replaced, maybe just the CHRA).
- Fuel pressure set at 3.5–3.8 bar.