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Old 11-14-2012, 04:25 PM   #5
IA Performance
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Member#: 25194
Join Date: Sep 2002
Chapter/Region: RMIC
Location: Boulder, CO
Vehicle:
2008 Forester XT 5mt
Dark Gray

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Are the -1 target values coming from the TD Boost section? It may be best to ignore this section as Target and Actual are 2 different things and it can get confusing since Target does not mean the car will actually achieve it.

At idle the negative 8 reading is correct as that corresponds to 16 inches of mercury.

Next step for boost pressure settings
If I read the post correctly, the car only fluctuated with stage 1 and has not done so with stage 2. If this is the case then stage 1 was over boosting, whereas Stage 2 needs more waste gate duty cycle. I'd try running the HWG map and see if:
1- the car achieves close to target boost (+/- 0.5 peak psi is acceptable)
2- the PSI fluctuates up and down

If the car only achieves 15psi then I would shorten the arm by 1.5 turns. That should net ~16.0 PSI.

Keep us updated as you find out more

Stephen
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