355 Ways to test exhaust valve on 355

You can mount a GoPro in the engine bay like this:


I hacked things and used an old phone wrapped in aluminum foil . With my previous muffler I couldn't hear the changeover very clearly either, but to my surprise everything was working fine when I checked the footage.

There are some conflicting reports on whether the valve works in neutral or not. I don't think it does? And I wanted to spare anyone from having to stand back there while I rev the engine.

 

Not as clear visually, but a less potentially expensive way might be to lightly wrap aluminium foil around the capsule and pushrod to see if the foil is dislodged or broken.

 

Had an original Tubi but it was on a 1995 2.7 car. The changeover was almost imperceptible -- sometimes it's actually easier to hear the difference while coming off the throttle.. there was just a bit of burbling there that gets muffled when the valve is closed.

 

It's controlled by the Motronics ECU as per the following:

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There is no fuse. Power comes directly from relay M in the passenger footwell. Relay M controls power to lots of other stuff (including the fuel pump relay). Your relay M must be working.

In case there is a wiring issue, check that there is 12 volts at the solenoid valve (ignition turned on, car not running). The Motronics ECU provides an earth to the solenoid (under the conditions stated above). There are two solenoid valves in the same area. It's not the one with the blue plug.

Wiring diagrams available if required

 

You could also check the continuity of the solenoid valve coil. It should be around 55 ohms (across the connector pins).

It may vary from car to car, but faults with this system are usually recorded by the ECU. Have you run a scan recently?

 

You don't have one of those cheap Fiat 3-pin adaptors?

https://www.ferrarichat.com/forum/posts/147223725/

https://www.ebay.com.au/itm/324009091262?

Avoid the "Goliton" brand. The connector pins are too big for Ferrari's.

I wired one up to a cheap cigar lighter accessory plug.

 

It should. I haven't heard of any problems with them (other than badly fitting pins).

The 5.2 OBD is only hooked up to engine stuff, but it is quite useful.

 

It would be beneficial for you to ascertain what the sound of your Tubi muffler sounds like when the valve is open. There are Tubi versions for the 355 that do not sound loud or good at all in bypass mode. To do this, simply wire the valve open and drive it around under heavy throttle. See if that is loud enough.

Then, if it is F1 loud, and you are not getting that, then it is time to troubleshoot why yours is not loud.

Don't chase your tail.

 

Same experience.

 

I've got a capristo bypass valve on my car so I can drive with it open simply by disconnecting the vacuum line. It sounds amazing like this but I never drive it like this as the valve isn't supposed to be open all the time. I have sport cats and stock muffler. I wish there was an exhaust configuration that would make it sound like that all the time. Maybe cat bypass pipes would do it.

 

The Tubi muffler you have doesn't have an F1 sound at high RPM.

 

I have a vacuum brake bleeder.

Unplugged the rubber hose on the valve and connected the vacuum bleeder to it.

Pulled the vacuum bleeder trigger.

Little lever went up and down. I was happy.

Plugged hose back in.

 

Just get a metal wire and tie the bypass so that the valve remains open.

 

I can confirm the valve will open under repeated throttle blips in neutral..
so have someone look while blipping the throttle and should see the valve stem move up/down etc..

 

I disagree, did they explain why?

 

Are you concerned about testing the valve or torque? What do you think a valve remote controller does?