2300rpm is about the point a T25 starts to make useful boost, it sounds like the diaphragm may be split, possibly combined with a weak spring, I think forge do the diaphragm and spring, or have a search on ebay.
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It never got fast enough for me
Hunter S Thompson
R.I.P. Peter David Scott 18.07.59 to 21.11.16
Will be missed by us all but we will always remember you.
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