Hi, Just bought a 355 spider 2.7 and had cambelts done. My garage has just fitted a new capristo exhaust stage 2 and capristo valve and car sounds rough at idle. Valve seems to open at just over 2.5k revs (far too early) and is incredibly boomy at 4,000 rpm steady cruise. Missing the V8 capristo scream I’ve had before on previous 355s I’ve owned when fitted with a Capristo. The guys are confident they have Plummed and fitted correctly (experienced Ferrari independent) and I have had several 355 before. Any thoughts why this may be happening please? Thanks in advance…
Does it have the single capristo valve? I would swap back to the stock valve and see if it fixes it (provided it was working properly before).
Just over 2500rpm is about right unless you're in 2nd... the valve opens at: >=80% throttle open and >2,800 rpm in 1st, 3rd, 4th, 5th and 6th. >=80% throttle open and >4,000 rpm in 2nd. Stage 1, 2 and 3 are all the same volume level with the valve open. The only difference is volume with the valve closed. Stage 2 may well be a bit noisy with the valve closed compared to a stage 1.
>=80% throttle open and >2,800 rpm in 1st, 3rd, 4th, 5th and 6th. >=80% throttle open and >4,000 rpm in 2nd. Caused by noise regulations in Switzerland.
By the way are you aware that the Capristo valve works opposite to the factory one? It uses vacuum to close, not open, and requires a new solenoid. Did the garage fit one? If not, that will be the cause of your issues.
