Rotrex Gti6 Exhaust.

[boldy205 75]

Hi just after some pointers regarding a custom exhaust. I've go a low boost Rotrex GTI6 in my 205, i'm going to get a custom exhaust made for it, downpipe back. Looking at sizes, people seem to run 2.5" . Anyone on here have and experience/advise ?

Thanks

Matt

[allanallen 528 2 Cars]

It'll be loud so big boxes! I know spiky had trouble keeping his quiet and ended up with a big chambered affair from memory.

[boldy205 75]

Think that might be a problem, as it will need to be under 100dB's for track days. will have a look through his build for some info.

[stef205 92 1 Cars]

mine was 90db with 3 boxes

 

[boldy205 75]

Good to see a pic thanks Stef. I presume that's 2.5" pipe? How much power does the engine make?

Thanks

[blandy 29]

Do they really go a lot louder when charged? I.e my system tests around 92db now so with the charger added would it be likely to go above 100 and cause track issues

[boldy205 75]

I'm not totally sure about the static tests, but drive by can be quite a bit higher from what I have read?

[blandy 29]

yeah thats my worry as i had my 2.5" system done with the charger in mind and went for the biggest boxes he could fit in. I do have one last option of a huge box under the boot floor and then have the exhaust exit the other side but hoping it wont need to go that far

[Tom Fenton 1,541]

Supercharged are as loud as they get in my experience, you are creating far more exhaust flow than a NA engine, but you haven't got a turbocharger in the way to take any of the energy out of the exhaust gas stream. No point mithering about it, its a case of try it and see.

[welshpug 1,657]

yup, I think even with a low boost setup there's at least 50% more air going in, so 50% more fuel and 50% bigger bang, theoretically 50% more noise.

[James_K 6 1 Cars]

Mine was at 86db before supercharging, that's with 2 boxes and 2.5". I haven't measured it properly since but it isn't significantly louder, less than 100db almost certainly. A good sized centre box is needed though

[boldy205 75]

I was thinking of the idea of a larger rear silencer under the boot floor as there is a fair bit of space with spare wheel removed. Well I think a 2.5" is needed for the flow of gasses. So then just massive boxes!

[boldy205 75]

I was thinking of the idea of a larger rear silencer under the boot floor as there is a fair bit of space with spare wheel removed. Well I think a 2.5" is needed for the flow of gasses. So then just massive boxes!