Thanks for clarifying the update situation, my bad with with the K309 confusion.
Just to be clear, electric bypass is 2021+ and you can change the behavior with vacuum systems too, right?
And is there are any problems with GPF or is it only acting a bit like a muffler?

Yes, I can manipulate the exhaust active electric valve position on the +2021MY.

Yes, I can change the behavior of the earlier models equipped with vacuum valves, but those are open anyways when the loud button is active so it's really pointless. Also, if it's not open (normal mode..etc), the driver can simply pull the fuse operating these vacuum valves which forces them open 100% of the time. For those reasons, we don't edit the valves in the mapping for the vacuum equipped vehicles, leaving the driver the adjustability to suit ones personal desired exhaust note..

The late pre-facelift F-Type GPF's had zero programming into the engine ecu, they were equipped and not monitored, as the facelift models came about, the GPF became monitored and required disabling inside the ecu to be removed/deleted.

I have double-checked with the UK guys and it seems like a fact that some update (at least in Europe) makes valve closed even in dynamic + loud button active under cca 3,5k rpm (thats the reason why pulling the fuse) - I am talking about vacuum system cars.
If you can change this behavior - active exhaust on = open valves like the original, I am sure you would have quite a few customers here. Many people don't want to lose the ability to close the valve and don"t want the fuse out.

Yes, as Chris has stated, we can change the behaviour of the valves, on the early vacuum operated cars with software.

Hi Stuart, can I interrupt for a moment. I have the VAP pulley and tune and the touring exhaust on my V6S. All was fantastic until I had Jag service it last year and they have murdered the engine note which is now whoofy in normal mode, like an old dog's fart. Dynamic is still fine but it is a bit over the top for normal driving. Jag say they didnt do anything but the tune and exhaust have been checked and they are working perfectly. I asked my performance mechanics if we could go back on the ECU and they thought you could end up with a major disaster if we tried. Is there anything that can be done from your end?

Also I am at the pointy end of deciding whether to go ahead with a CAI. After reading the many, many posts on it, I am inclined to go with the carbon upper pipes which means Paramount at the moment. Is there a VAP product coming out any time soon?

I deal with files world wide, I edit files all day for a living.

I’ve seen all the K309 updates.

When I tell you, the K309 update only affects the fuel on overrun delay, I’m not comparing it to how my ears and butt Dyno interpret leaving a dealer after an update..

I’m stating only facts that I see in the actual bin file pre vs post K309 updates. But, you are free to take the option of some UK guys.

FYI; Our file submission page allows for someone to request the bypass change to suit as desired preference.

I am sorry for the confusion, the K309 code was my bad saying it affects valves as Stuart pointed out earlier, this happens with a different update.

Can you do this software exhaust modification in the 2023 F-pace SVR? Also Is it possible to get valves opened 100% only if you push exhaust or dyunamic button?

Yes, we have our own SVR and have modified the software so the valves are 100% open all the time when the exhaust button is pushed.

If you have our touring exhaust, then you have no valves at all, because our touring system deletes them. I suspect that you mean that you have our valved exhausts? It's not possible for JLR to change the tone of the exhaust with software, unless they had altered some valve mapping but as Chris has stated we have not seen this done before. If you're hearing sound differences, and your technician has verified that the exhaust valves are still working correctly, you might want to ensure that your cats haven't failed/blocked?


If your tune is still on the car, it's also not possible that they updated the ECU.

Thank you Stuart. Only one question about. In confort mode, without any software modification, (meaning exhaust or dynamic button disabled), if you pass 4000 rpm exhaust valves should open 100%, am I right?

Hey Stuart, thanks for the feedback. Oddly enough the issue seemed to spontaneously correct itself about a month ago, quite bizarre. And it wasnt just my imagination, my missus noticed it as well. It is now back to its full obnoxious-ness, even moreso as I have since added the mina CAI

Sorry, late to this thread - I read everything but I think my use case may be different.

When in quiet mode I want my exhaust to NOT go loud in the upper RPMs. I'd rather it stay quiet the whole rev range unless the loud button is enabled. Mine is a 2015R so I have no problems with noise in the lower revs, and it has the vacuum system.

Possible?

Reason I want this - track day noise restrictions.

Hello, just checking in, is there an answer to the above? I would love to disable the open valves in the upper rpms. Thx

I wouldn't recommend it, but it's possible..

The exhaust bypass opens up to relieve backpressure in the system during the high rpms. You would be asking to increase backpressure and possibly provoke the onset of misfires due to a backpressure increase over what's engineered.

How does this work with the quieter VAP exhausts that don't have valves, are those just designed to have lower backpressure in the first place? How about the VAP Valvetronic exhaust? Is the backpressure comparable to the stock muffler and therefore also requires the valves to open at higher RPMs?

The stock muffler has smaller diameter piping internally than what is being routed through the bypass.

Our muffler piping and internal piping is larger than OEM.

Cool, that makes sense. Does that also apply to the VAP Valvetronic Race/Touring exhaust? If so, would keeping the valves closed at higher RPMs be feasible there? I realize this probably isn't something you've tested, of course.

No, our valvetronic has smaller diameter piping inside the muffler, similar to OEM.

Thanks for the answer! I would have thought the cats were the most restrictive thing in the exhaust but I guess the mufflers are pretty restrictive too. Problem is, it goes from restrictive super quiet to essentially a muffler bypass lol. That plus the VAP cats make for a good time, but it can cause problems with the noise restrictions. What would you recommend?