Join Date: 2nd April 2013
Location: Surrey, UK
Thanked 121 Times in 120 Posts
Consistency on dynos is rare as there are so many variables.
Different makes of dyno,
Operator - they can easily amend and / or fudge the results.
Comparing different days on the same dyno isnt too useful, let alone different dynos.
If a specific dyno and operator tests lots of the same car then they will know what ballpark the bhp should be.
As you have seen TDI North do lots of K20 work, and so do Eurospec 2000. As a rough guide TDI North shows 10-15 bhp more than Eurospec for naturally aspirated K20s. Eurospec dyno has been called the heartbreaker, but essentially its a tuning tool and its the before and after tune which is important.
As an example I had an EP3 at 225 bhp with Eurospec. No changes and dynoed 239 bhp at AMD Essex. Sounds much more impressive but thats why comparisons are risky and complicated.