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Showing results for tags 'back pressure'.
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Hey I recently had my 25det Neo on the dyno. Won't hold boost after about 5500. Apexi ax53b70 on 16psi with standard manifold, 3in bellmouth dump into KTS dual front pipe into 3in flex pipe into 3in stainless catback which measured 2psi of pressure at the o2 bung in the dump at full noise on a power run. Worth noting it's running type b poncams, standard cam gears. We checked the bov (r33 gtr item) for leak on the dyno and the intake plumbing had 25psi plumped into it before dyno to check boost leaks etc. It seems to me the wastegate is blowing open so I'm thinking of plumbing into the turbine housing to check this as it has a bung I've got a bolt in, blocking it off. Any help or advice at this point would be greatly appreciated, will provide pics of dyno sheet upon request, if desired. edit: forgot to mention it's running a new turbosmart eboost street ebc.
