GT4 / Spyder Particulate Filter (Workaround)

[Twinfan]

Do all MOT stations have particulate testing gear now? I suspect they don't.

So it depends exactly what is changed on the car, and what for, as to whether it will pass a basic CO2 emissions test.

[Cheib]

Porsche911R said:

Twinfan said:

You're talking "ifs" and "mights".

So it's currently not illegal.

well if it don't pass the emissions figures for that model year then yes it would be.

It's not easy to get any answers atm.

I don't think a car needs a GPF if it can pass which leads me to think if you took it off it would fail.

I think I read the test is that is if’s not to manufacturers spec....so it would fail on that basis.

On the subject of the fun police....they’re testing noise cameras. You’d think they would be in pretty specific places....like Sloans Street.

https://www.gov.uk/government/news/new-noise-camer...

[gtsralph]

If you are not planning on keeping the Euro 6d GPF car for more than 3 years, go for it!

McLaren don't fit one as they don't use direct fuel injection.

[TB303]

I think removing a filter is more in the category of decatting type of mod - ie quite illegal compared to putting a sports exhaust on. I’m sure some will do it, but in 2019 I think it’s quite a high risk thing to do on a modern car.

[Nuttcase]

https://www.parliament.uk/business/publications/wr...

Removal of a GPF would fall into the same category.

[chrisABP]

I think that any sports exhaust solutions are likely to be GPF back options....

Looking at the images of the 718 GT4/Spyder exhaust I feel that a lot of the soundtrack loss could be recovered by effective remodelling of the large rear silencer arrangement and therefore leaving the GPF filters still in place and fully operational. Time will tell...…

If there is anyone out there with a 718 GT4 / Spyder and wants to offer their car for some development work here in the UK (can't imagine it would be for any longer than 1 week) I can possibly put you in touch with a company who might be able to help and you get a system FOC...…?

[TDT]

chrisABP said:

I think that any sports exhaust solutions are likely to be GPF back options....

Looking at the images of the 718 GT4/Spyder exhaust I feel that a lot of the soundtrack loss could be recovered by effective remodelling of the large rear silencer arrangement and therefore leaving the GPF filters still in place and fully operational. Time will tell...…

If there is anyone out there with a 718 GT4 / Spyder and wants to offer their car for some development work here in the UK (can't imagine it would be for any longer than 1 week) I can possibly put you in touch with a company who might be able to help and you get a system FOC...…?

It's effectively the same type of box as the GT3 - just bridge shaped to allow for the diffuser.
So you could employ the same type of solution as the x-pipe/sharkwerks style bypass.

But while the GPFs are in play, a lot of sound will be killed there.

[SC50]

Taffy66 said:

The only aspect of the warranty Porsche can legally enforce with a aftermarket exhaust fitted, is they will refuse to extend the original warranty unless car is 100% oem..There's a lot of misinformation and scaremongering in the UK no doubt spread by the OPCs themselves.
I'm fitting a JCR Titanium exhaust to my RS with GPFs next year and might also delete the OPFs as well..The biggest obstacle is to inform your insurance company and make sure they include it in the certificate should the worst happen..

I fitted a JCR superlight centre bypass to my GT3 and my insurance company said no charge. But must be
fitted by a garage

[Steve H]

The MOT regs are very simple, it is an MOT fail if any original part of the emission system has been removed. DPF, GPF, catalyst, they all count.

The application of the regs is less simple, there’s plenty of emissions kit that can be removed and still pass the emissions part of the test (this would almost certainly apply to GPFs) and the reg concerning removal is just a visual test so if the components in question appear to be present or are not visible without disassembly then it is a pass.

You can suit yourself on the rights/wrongs of doing it but given the massive gains that have been made in emissions outputs over the last few decades it might be possible that the tiny gains that are left are being chased because they can be rather than they need to be.............

Blanket condemnation of things like DPF removal is an oversimplification and doesn’t consider the environmental cost of repairing some of these systems on older cars or the environmental impact of building new cars when older ones are prematurely written off for financial reasons.

[thelostboy]

In that case then, I'm happy to declare it a load of balls until I see something conclusive. I have zero faith that an MOT tester would be up-to-date or care enough.

I have had a decatted car pass an MOT before and passed (it was very marginal, but nevertheless passed), if I really had to, I would swaps exhausts for the test if need be.

[Fish]

The biggest issue with the newer cars is not the GPF it is the more stringent EU drive by regs, the car is very quiet between 2-4k then especially under load opens the valves and sounds great..

You could unplug the valves and it should sound a lot better in that quiet range however you will lose the switch function.

The ability to reprogram or trick the switch into holding them open properly when switched open would be great. Rather than the current manipulated opening and closing they do all over the range dependant on throttle position and revs..

If this was still too quiet a new back box would release a lot more noise.. as essentially your only silencing then would be the cats and GPF..

Please someone make a wireless kit which plugs into the solenoid and the switch under the centre console which would do as you would think and switch them on or off... I'd be interested..

[Porsche911R]

Fish said:

Please someone make a wireless kit which plugs into the solenoid and the switch under the centre console which would do as you would think and switch them on or off... I'd be interested..

"CARGRAPHIC OEM Valve Control"

The perfect match for all models equipped with factory
valve controlled exhaust systems:

Valves integrated in factory exhaust systems are programmed
to open in automatic mode or at specific RPM/speed.
It is also often the case that the factory valve control is
programmed to open the valves when the engine is started
- which makes it difficult to drive off discreetly.

With the new CARGRAPHIC OEM Valve Control you
will receive full control:

- Open valves at any RPM or speed
- Start engine with closed valves
- Choose factory automatic mode

Edited by Porsche911R on Monday 18th November 11:07

[Fish]

Yep I've seen that but I don't want a separate remote I want to use the switch... I need to have a look at wiring the remote into the switch..

Edited by Fish on Tuesday 19th November 06:41

[tedblog]

The present mot tests on exhaust

Requirements
Complete, secure, without serious leaks and silences effectively.

Exhaust system

Test procedure

The exhaust system must be free from serious leaks or advanced corrosion. The entire system must be securely fixed to the vehicle as intended either by using exhaust mounts or the common rubber fitting mounts. The exhaust system must have the required number of silencers for your specific make and model of car. Your vehicle may fail the MOT due to noise levels if deemed to be excessive by the MOT inspector.
So by that if you are missing something then yes it can fail?

[R8_BAV]

Porsche911R said:

"CARGRAPHIC OEM Valve Control"

The perfect match for all models equipped with factory
valve controlled exhaust systems:

Valves integrated in factory exhaust systems are programmed
to open in automatic mode or at specific RPM/speed.
It is also often the case that the factory valve control is
programmed to open the valves when the engine is started
- which makes it difficult to drive off discreetly.

With the new CARGRAPHIC OEM Valve Control you
will receive full control:

- Open valves at any RPM or speed
- Start engine with closed valves
- Choose factory automatic mode

Edited by Porsche911R on Monday 18th November 11:07

I've just emailed them to find out if they have tested this with the new OPF cars that have the electronic valves.

My understanding is that these new valves are Can-Bus monitored and if they are not seen by the car you will get an EML and it will go into limp mode so not quite as simple as the older style vacuum valves to play around with.

[JulierPass]

Does anyone have any first hand experience of an opf delete? There are whatts app videos now starting to circulate and the cars do sound good with the filters removed. I have been lead to believe its a pretty simple installation and the error codes just need to be cleared off once the filters have been removed. There are now offerings from Fabspeed and JCR look to have something in the pipeline. Anyone had this done yet?

[Twinfan]

It's not just a case of clearing error codes as the GPF filters are sensored so ECU work is required. This will explain why few people are doing it.

[JulierPass]

Twinfan said:

It's not just a case of clearing error codes as the GPF filters are sensored so ECU work is required. This will explain why few people are doing it.

Maybe, but it can be done very simply. Kline, Fabspeed and JCR all have offerings. Cars are being done as we speak, and the difference is marked. I failed to love my 918 because of the gearing, but the noise it made was great. The 718 needs the same voice and the opf delete delivers it.

[Twinfan]

I didn't say it wasn't possible, just very few people will do it as you risk throwing away your car's engine and electrical warranty. Messing with the ECU on a car under warranty is for people with far deeper pockets than I have...

[woollyjoe]

For a second let’s pretend you don’t need an MOT time or car insurance, or that you will sell it to an OPC.

Given the state of things from diesel gate through to today’s environment and our awareness of why a GPF exists. Do you really want to be that person?

Wasn’t cool when people did cat deletes and it’s even less cool now. All the companies selling these just hit lowest of the low for me.