The owner of this very unique set-up was looking for big power from a naturally aspirated H series engine.  This set-up was planned over the span of a few years and has finally reached its completion.  AV Tuning & Development had a custom set of 90mm 12.5:1 CP pistons designed for this application to be used with AV’s custom 2.4x stroker kit.  For valve-train we went to Skunk2 Racing to get the best camshaft available on the market for this Naturally Aspirated set-up, the Skunk2 Pro3+ camshaft.  Using other components such as the TWM 52mm ITB’s, Injector Dynamics 725cc fuel injectors, Hondata s300, Hytech Exhaust Manifold, and custom AV Tuning & Development 3″ Stainless steel exhaust helped to surpass the client’s original goal and make 281whp/210tq on pump 93 octane gas.  Very good power for pump gas with a rather low 12.5:1 compression ratio.  With a race gas tune in the future we expect gains of 14-20whp/tq.  Stay tuned for further information and a detailed gallery of this build.

Run_001 – Air Box Installed   Run_004 – Air Box Removed (Straight ITB)

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The dyno chart speaks for itself.  Due to our client’s wishes we cannot give out specifics about this set-up.  Naturally Aspirated B series tuned with Hondata s200.  11’s with this set-up should be no problem with 256whp/164tq.

Stage 1 of the quest for 400whp has been completed.  To accomplish this goal we removed the stock EJ251, mildly reworked the cylinder heads, and also replaced the stock EJ251 bottom end with the beefed up EJ257 bottom with a set of CP Pistons.