Cupra R fluttering boost on load

Nov 22, 2021
7
0
Hi guys I’m really stuck here so I’m hoping one of you has had a similar or the same problem as me and can shed some light on this situation.my mk1 cupra R flutters like mad while on load between 2k and 3k revs almost as if it’s dumping then loading the boost but at a very fast rate, after 3k it seems to level out and performs as normal.

I’ve tried disconnecting the n75 valve and this gives me very low boost pressure but it’s constant and the fluttering goes away. I have tried several other n75 valves off breakers but no luck, is it likely to be the n75 valve and I’ve just had bad luck with the ones off of breakers ?
 

smutts

Active Member
Apr 12, 2020
372
188
Turbo surge?
Has he intake impeller "self modified" itself by eating something?
 
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