F8 exhaust options. GPF delete

Sounds very positive cpiguy! Maybe these pressure sensors aren't nearly as sensitive as what was previously made out! I think something had to give with F8 sounding so lame and a working controller will certainly be a great start. Have you checked Forza out? 2,500 sounds a lot for a controller.

I also read where Tag was saying Novitec assures their system worked without issue as well so it's shaping up that the previous advice I received from our guru Ferrari tech was bad information. Otherwise it could be a case where Ferrari's electronics have again failed to provide the very fail-safes they had installed into the system. Funny.....but typical i suppose.

The other interesting thing I heard recently from a Pista owner I know who has the 200 cel high flow cats and Kline is that he assures there has been no CEL from the high flow cats. So this also means the pressure sensor upstream isn't as efficient in detecting changes in pulse and pressure as what was made out. Maybe there is the opportunity to get rid of the gpf entirely and use some 200 high flows...change out the muffler etc. I wonder if Kline has anything for F8 yet. Their large X uses valves and mufflers so it would still give you a quieter mode.

 

I think the Novitec HFC system sounds terrific. It cost about $20k installed here. I’ve decided to buy the remote valve kit for $1500 installed and call it a day. I also don’t want the warranty risk. I’ll keep you posted.

 

When you say pinned , how ? Shadowfax has said F8 the actuators are electronically controlled and variable position opening. So pinned doesn't mean like on the 488GTB disconnect the air supply. You should find out how they pinned them or did they just disconnect the electrical signal to the values. This for sure would throw a code

 

Yep and any 488 GTB / SPIDER PRE 02/2019 get and oil change and filter every year

 

This is certainly was what I was told but it's now all looking to be either bad info or just another example of Ferrari's electronic wizardry failing all intents and purposes. So on that score if the fail-safes have failed then Ferrari has inadvertently given F8 owners a monumental lucky break by allowing them to recover what was a tragic situation (sound-wise).

 

Maybe ? But either way even if they are able to be opened the GPF will also have an effect.

 

If the fail-safes don't work and there is no negative affect on the engine then that opens the door to get rid of the GPF entirely. You could always still maintain the operation of the valves by using a valve controller and change the muffler and pipe out for better stuff (large Inconel X etc). I know what I'd be doing. It would be bye bye GPF and stock muffler for starters.

 

This is very interesting and if the valve controler works ill definitely go that way when my F8 finally arrives, I can't see many people wanting to void new car warranty when the F8 has not been out for that long

 

With the 488 Pista, Ferrari included the means to sense if the vacuum control valves were in the position that the ECU believed they should be. This is probably based on sensing if the electrical circuit’s impedance is within a prescribed range. In prior models, the ECU would only check to see if the circuit was open or closed and that much easier to override. So I’m assuming the F8 controller circuitry keeps the impedance within the prescribed range regardless of the actual valve position or slight pressure changes.

One problem with leaving the valves always open for “sound”, there will probably be a small performance penalty (low end torque, perhaps?) under certain conditions where the ECU wants the valves to be closed. It would be interesting to do a dyno analysis to see the effects of the valves being open all the time.

 

Please do. I will buy immediately if it works ok for you.

 

I would feel a performance reduction on acceleration from low rpm on my 458 with valves constantly open so I imagine it will be the same with any other system but probably on this system more so then the 458

 

Not so. It is more likely that the 458 with valves open will manifest a more noticeable drop in power than a 488 with valves held open. The 488 engine will not lose power, only response.

458 being naturally aspirated, opening the valves at lower rpms removes the optimum backpressure environment required for optimum scavenging, so power would certainly be less than if the valves were left under the ECU's control. No question about that.

On a Turbo engine it's the opposite where less back-pressure is desirable. However, with Ferrari's turbocharger set up the valves are incorporated into the overall design which provides optimum turbo response = less lag and improved linearity etc.

On a dyno it would be very unlikely to find a reduction in power if the valves were being held open manually on the 488 engine. The measure here is turbo response and boost recovery time during on and off throttle particularly at lower engine rpms. This would unlikely manifest a loss of power on a dyno chart.

 

Thanks for the info

 

Capristo controller installed and working beautifully. Will take it for a run this morning. I’ll let everyone know how it goes this afternoon.

 

Awesome, can you post a video of switching between the two please?

 

It’s official, I just did a 30 minute aggressive drive with the valves open, and no CEL!!! It sounds great. I know it doesn’t make much sense, but sounds better throughout the entire rpm range, but especially at the lower rpms. You even get a few pops here and there that I never heard with them closed. Also, definitely doesn’t affect performance. Car is just crazy. I wish I could get the tires to hook up. When you look at how wide my rears are, it’s shocking how easily they break loose.

 

Here's a couple of clips. Need decent speakers.

 

What’s the rattling noise in both videos?

 

No idea. Don’t hear it in the car.

 

I’ve been following this thread to see how the controller performed and that’s the only drawback I see. If that rattle is something on the car or maybe just some feedback on the camera. Sounds good other than that. Looks like a solid option to correct the quiet exhaust on the F8.

 

Looks like a good result cpiguy. The valve controller certainly makes enough of a difference to make the exercise worthwhile. I still can't understand why Ferrari doesn't offer a button on the console like Porsche. Could only be cost related looking at what little they offer on the car without options. The fact you were able to use a controller also indicts Ferrari's claimed fail safes are the best part of useless. Funny really but not surprising.

 

Definitely not a silver bullet...

 

Thanks so much for posting

 

I think it is just the mechanical noise of the flap opening nothing to be worried about

 

I'd say you'll need to change the muffler out and get rid of the gpf before you get close to where you need to be. I thought F8 sounded seriously asthmatic even with the valves open at WOT. Its like there is no combustion engine sounds coming out the tailpipes, just a whole lot of forced air....like an LPG gas bottle being opened up.