Low boost on a O.CT chipped RS6

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Dec 27, 2009 | 06:59 AM

cmore

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AudiWorld Member

Joined: Apr 2003

Posts: 110

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Low boost on a O.CT chipped RS6

Everyone,

I have an 03' RS6 with the O.CT engine and transmission chip, K&N, Milltek downpipes, cats, and exhuast, and hyperboost DVs on a car with 31,000 miles.

I just installed a VDO boost gauge today and it looks great, but it is reading 12psi MAX and bleeds off to around 10psi at redline. I thought maybe I have a hole or leak in the gauge line so I ran a new one outside of the car, through the window, and into the gauge as a test. I had the exact same readings of 10-12psi. During idle it is reading 20 Hg of vacuum.

I read the O.CT chip should be running 16psi and I'm seeing 4psi less than that. Today is in the 30s F here in Pennsylvania.

The car has 93 octane in it or at least that is what the pump said. I also replaced the rubber hoses going to the DVs in case one of them had a leak, but no difference.

I do have a VAGCOM, but I can't record block 115 because the battery is dead in my laptop and won't run without being plugged in. While I'm sourcing a new battery do you guys have any idea?

Before putting in the gauge I've noticed the car doesn't seem to have as much power as normal and then later it is fine. I'm almost leaning toward replacing the N75.

Any other ideas? I assume most will want to see a log of block 115.

Thanks,
Chris

Dec 27, 2009 | 05:19 PM

initialA4

AudiWorld Senior Member

Joined: Jan 2003

Posts: 1,764

Likes: 1

I believe they are around 0.8bar to 1 bar. 16psi would be too much! Also keep in mind sometimes in the winter the car will make boost less than during summers.