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Old 10-02-2007, 12:23 PM   #1
Broxma
Scooby Specialist
 
Member#: 158006
Join Date: Aug 2007
Chapter/Region: TXIC
Location: San Antonio
Vehicle:
2003 WRX IdleWagon
1992 GVR4 379/1000

Default strange boost occilation

Need a little help figuring this one out so some background first is in order I suppose.

03 WRX Stage 2 XPT Map
Stock TD04 P&P
Gutted up
Catless TBE
Perrin EBCS running Interrupt

So before the P&P on the turbo I was running the EBCS in Bleed mode, hitting target boost everything was great except the spool was pretty slow.

So I P&P the turbo and run the EBCS interrupt mode, and I start getting wild Boost spikes, like up to 20 psi then dropping to 10.

So I cut the Dynamic Burst in half as per Jeff at Perrin, now I am hitting 17 psi but instead of it simply dropping down to say 14 and holding, it fluctuates between 12 and 17. Boosts up to 17, drops down, back up, repeat. Oddly, it only does this at WOT. If I am only about 75% throttle, it will hold at whatever the target boost is for that RPM, about 12 psi at 75%.

What tables specifically would affect that type of behavior? I haven't cut the WG Duty cycle down yet and that is my next step, but I was hoping some uber tuner with more experience than me might have some idea's.

/Brox
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