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mTDI Mechanical TDI Conversions / Re: Thoughts on mTDI AHU head porting
« Last post by RabbitJockey on February 06, 2024, 02:54:24 pm »in this video holdener gets a 10% increase in flow from just doing the basics.
https://www.youtube.com/watch?v=6o3SaUtfai8
I also did a 3 angle valve job and back cut all 8 valves on my head. It doesn't run yet so i can't tell you how well that stuff works. plus its not like i had a before and after flow test. But these are cheap mods the machine shop can do to improve flow.
also now that i've thought about it more, if you're going to be modifying the head you really want to a bigger turbo. the k14 is great for low end power but it can only flow maybe 125hp and the stock head can easily move that much air at low boost. You really want to choose a power goal and build to that.
https://www.youtube.com/watch?v=6o3SaUtfai8
I also did a 3 angle valve job and back cut all 8 valves on my head. It doesn't run yet so i can't tell you how well that stuff works. plus its not like i had a before and after flow test. But these are cheap mods the machine shop can do to improve flow.
also now that i've thought about it more, if you're going to be modifying the head you really want to a bigger turbo. the k14 is great for low end power but it can only flow maybe 125hp and the stock head can easily move that much air at low boost. You really want to choose a power goal and build to that.