718 Gt4 exhaust options

718 Gt4 exhaust options

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Discussion

Rojibo

1,431 posts

41 months

Wednesday 16th December 2020
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Twinfan said:
I think the engine mapping wil have affected that too. Meeting the lower particulate restrictions means not pumping petrol into the exhaust...
I agree with you, but the 718C courtesy car I had a while back, when I still had my 718C behaved in the exact same way in terms of provoking the noises out of the exhaust, it's just that they were rather muffled. They couldn't be so lazy as to just stick some GPF's on it and not change anything... could they? hehe

Twinfan

7,516 posts

68 months

Wednesday 16th December 2020
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MannyLon said:
So really OPF is the enemy smile
I've reached out to JCR and asked about their kit, albeit expensive that has headers and opf delete and passes MOT.
Not just the OPF IMHO.

I'd be interested to know if JCR have tried to get their car to pass an MOT and how it got on. I'd also like to know what their insurers said about it...

Rojibo

1,431 posts

41 months

Wednesday 16th December 2020
quotequote all
Twinfan said:
I'd also like to know what their insurers said about it...
hehe

MannyLon

1,265 posts

170 months

Wednesday 16th December 2020
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Right, JCR say that no remapping is needed for their header/pipe kit. I'm checking with my insurers to see if it's okay...

Twinfan

7,516 posts

68 months

Wednesday 16th December 2020
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MannyLon said:
Right, JCR say that no remapping is needed for their header/pipe kit. I'm checking with my insurers to see if it's okay...
Interesting. Let us know what they say smile

Did JCR say whether you'll get engine warning lights showing if you do the mod?

MannyLon

1,265 posts

170 months

Wednesday 16th December 2020
quotequote all
Twinfan said:
Interesting. Let us know what they say smile

Did JCR say whether you'll get engine warning lights showing if you do the mod?
No lights according to JCR. Let's see.

I've found trying to mod a Porker is much harder than other marks as the dealers always try and add zeros to the bill unecessarily smile

Twinfan

7,516 posts

68 months

Wednesday 16th December 2020
quotequote all
MannyLon said:
No lights according to JCR. Let's see.
If it was me, and I was going for that mod, I'd want assurance of a refund if I got CEL lights showing. We've discussed it here on PH previously in your thread ( https://www.pistonheads.com/gassing/topic.asp?h=0&...) and there are ways of tricking the system to a certain extent, but I'd be very surprised if they've managed to do it.

Happy to stand corrected though from someone who has the kit fitted!

MannyLon

1,265 posts

170 months

Wednesday 16th December 2020
quotequote all
Twinfan said:
If it was me, and I was going for that mod, I'd want assurance of a refund if I got CEL lights showing. We've discussed it here on PH previously in your thread ( https://www.pistonheads.com/gassing/topic.asp?h=0&...) and there are ways of tricking the system to a certain extent, but I'd be very surprised if they've managed to do it.

Happy to stand corrected though from someone who has the kit fitted!
Good point. Would be a real pain spending all the cash and getting issues later.

Twinfan

7,516 posts

68 months

Wednesday 16th December 2020
quotequote all
MannyLon said:
Good point. Would be a real pain spending all the cash and getting issues later.
yes

TDT

2,814 posts

83 months

Wednesday 16th December 2020
quotequote all
Where is the OPF sensor on EU cars? as I haven't seen anyone show where this is connected on the Over axle pipe or after the OPF filter.
The only sensors i have see so far are on at the header - before and after the cat.
So is it a differentiation pressure loop system? in which case - this can probably also be solved with stand-offs.... Cargraphic appear to have done this with their high-flow OPF system. No software required.

Edited by TDT on Wednesday 16th December 17:03

Twinfan

7,516 posts

68 months

Wednesday 16th December 2020
quotequote all
TDT said:
Where is the OPF sensor on EU cars? as I haven't seen anyone show where this is connected on the Over axle pipe or after the OPF filter. The only sensors i have see so far are on at the header - before and after the cat.
It's hard to tell, but they're listed in this pic. You can see the versions with sensors seem to have more "stuff" on the OPF cannisters:


TDT

2,814 posts

83 months

Wednesday 16th December 2020
quotequote all
On the first 2 options - (Flow Optimised OPF) and (Empty Can with Sensors), Cargraphic have got sensor taps on the OPF Cannister itself.




In the case of the Empty Can with Sensors - Cargraphic state you need software... as there is no filter element.

What does OEM have? maybe one of you guys can have a look under your cars.

Someone in the US took to making their own version...by scrapping out the filter element!



|https://thumbsnap.com/5LCr7jqJ[/url]

Edited by TDT on Wednesday 16th December 17:17

Twinfan

7,516 posts

68 months

Wednesday 16th December 2020
quotequote all
TDT said:
What does OEM have? maybe one of you guys can have a look under your cars.
Same location from what I can see...



Edited by Twinfan on Wednesday 16th December 17:22

TDT

2,814 posts

83 months

Wednesday 16th December 2020
quotequote all
Nice one. Is that a solid (metal) line?

Twinfan

7,516 posts

68 months

Wednesday 16th December 2020
quotequote all
TDT said:
Nice one. Is that a solid (metal) line?
Yup, I guess because of the heat around that area?

TDT

2,814 posts

83 months

Wednesday 16th December 2020
quotequote all
Twinfan said:
TDT said:
Nice one. Is that a solid (metal) line?
Yup, I guess because of the heat around that area?
I more meant, is it more like a pitot tube.... for measuring gas speed/pressure, and also soot level probing.... which it looks like it is.

Twinfan

7,516 posts

68 months

Wednesday 16th December 2020
quotequote all
TDT said:
I more meant, is it more like a pitot tube.... for measuring gas speed/pressure, and also soot level probing.... which it looks like it is.
You'll know more than me - I'm not an engineer or mechanic! I just drive the things...

MannyLon

1,265 posts

170 months

Thursday 17th December 2020
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I'm quite surprised that my insurance company have allowed me to fit the JCR pack if I went that route.

What do you guys think of the Cargraphic performance opf pipe?

Rojibo

1,431 posts

41 months

Thursday 17th December 2020
quotequote all
MannyLon said:
I'm quite surprised that my insurance company have allowed me to fit the JCR pack if I went that route.

What do you guys think of the Cargraphic performance opf pipe?
Everything has a price matey wink Personally I'd only change the back box until the warranty is up, and wait until there is more data on the reliability of these 4.0 units.

But I am just a cynical so and so.

Twinfan

7,516 posts

68 months

Thursday 17th December 2020
quotequote all
Me too - rear silencer only for me unless it's a track-only car.

It would be interesting to know if it will pass an MOT test, I'm unsure what the testing requirements are for an OPF car. I think for diesels any removal/modification to DPFs is an MOT fail.