Boost Pressure Fluctuations

[rokkie]

Hi all, as above I'm curious what you all think. Its tuned to 14psi @ 302rwkw. When I give it a boot full I notice the boost pressure go strong and hold 14psi then drops to 9psi and back up to 14psi a few times.

I have traction on but no traction light comes on when it happens. Its only started the last month that im aware of.

Mods are fairly standard for a BA xr6t

- 4 inch dump to twin 2.5

- bosch 1000cc injectors

- walbro 255 lph

- plaz valve springs

- sct tune (xcal 4)

- pwr intercooler with stock plumbing

Have not done the flapper mod as the tuner never mentioned it. So under the impression boost was controllable during tune. The dyno print out for boost was smooth with no spikes.

[Bizkets is Drunk?]

Actuator maybe?

[rokkie]

Holds pressure with compressed air, thought it might be the waste gate solenoid so replaced that too

[BenDoCo]

You have a 4" dump and the tuna didn't recommend a port/flapper job.....

Get that done and a re-tune and you should be sweet

[rokkie]

Thanks will look into that. What about the actuator? Aftermarket? And what brand as I've seen a few post about the turbosmart and not sure

[pj4000]

How'd you get on with this mate? Did u end up doing the flapper mod and new actuator.

[rokkie]

Not yet as it seems to have corrected itself the last couple of weeks. Holds 14psi all the way untill I lift the foot. Very strange!

Only change is 4 new tyres but when I was having the issue it didnt matter with traction on or off. Nice being able to smash the pedal and feel traction.