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As the title says, not sure what's up with my S5. Last night we only pulled 290 awhp out of the APR Stage 2+ tune with the pulley which basically is what most people see stock (see comparison with a 2010 S4 with just an exhaust). Power is already corrected for temperature. Altitude is 3500...

What car, what Stage 2?

Ended up going with the APR Stage 2+ - pulley and tune. Max boost is 1974 mbar (13.93 psi with atmosphere). Nothing super huge but today's runs averaged out to about 12.75s @ 110mph at a density altitude of 4142 feet, 0-60 in 4.3 seconds. This is on the 91 Octane tune with 94 Octane fuel. Was...

I'm still thinking it could be the BPV. I'm a jet turbine Engineer and I've seen many times where bleed valves and blow off valves say they're closed, but when you actually remove them and supply them with correct closure voltage they're not actually fully closed and therefore "leaking". This of...

That's a really good theory, however there are no codes. We even cleared the entire tune and tried again with the same result. Perhaps there's a parameter not being met that doesn't trigger a code. But we sent all of the data logs in Excel format back to GIAC and they looked at all the...

Nope. Pre-map and on the "stock" setting on the flash it runs awesome. 13.1 @ 105mph - feels as good as a stock S4/S5 should. Looks like stock boost is around 7-8 on these cars as I've read? And they're saying I'm getting 8.8psi....so still getting stock levels somehow with a leak....seems odd...

I'm hoping somebody has run into this issue before. As you can see in the data logging snap shot I've attached, with the bypass valve completely closed there seems to be boost bleeding/leaking SOMEWHERE else because it isn't coming close to boost levels as seen in pretty much everybody else's...