All Things Mk5 > How to Guides / Troubleshooting

MK5 GTI down on power

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MKVASMR:
I’m definitely not an expert but stock ecu boost specified value is 1700mbar which you are getting. A tuned one would be around 2300.

pudding:
The map sensor reading includes atmospheric pressure, so deduct 1000mbar to get the actual boost pressure. GTI runs about a bar of boost iirc, and ED30 runs 0.9 bar.

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