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Author Topic: Exhausts  (Read 15989 times)

Offline jonl

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Re: Exhausts
« Reply #30 on: October 26, 2011, 08:48:15 pm »

It`s worth mentioning again that the BTB system has the best documented performance inrease. That is, tested on the same vehicle with the same engine spec. (on the same rolling road)

At 4000 rpm there is an extra 12 bhp. This is still with standard catalyst and unchanged boost of 1.2 bar. Any SS equipped car should achieve this.

Apparently MOT tests are being tightened next year. So cat quality or lack of may become more crucial.....time will tell.
A500, Campovolo Grey,White Stripes.
AVO Suspension.
BTB bypass exhaust system.

AbarthForum.co.uk

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    BTB Exhausts

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    Re: Exhausts
    « Reply #31 on: October 27, 2011, 09:20:07 am »
    Thanks for all the positive feedback. As far as cats go, we are now governed by regulations as follows if anyone is interested:-
    http://www.dft.gov.uk/vca/additional/files/enforcement-and-research-activities/replacement-cat/replacement-cat-regulations.pdf#search="replacement cat"
    Our price to Abarthisti members still includes free fitting at our premises, therefore, assuming a customer had a replacement cat already fitted which is designed to mate up to the standard system flange in the original position, there won't be any problem fitting our system. We can accomodate slight variations with no extra charge (We have discovered that there are slight differences even on standard cars due to manufacturing tolerances).  Our front flange is already the same internal size as our larger bore centre pipe, so that won't provide any problem either.

    Offline FWD_Boy

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    Re: Exhausts
    « Reply #32 on: October 27, 2011, 01:02:57 pm »
    Right to just recap whats basically been covered...

    Back boxes
    Pretty much just add noise and looks to the car, there are plenty on the market now, even more if you look to european sellers. Some like the monza and the Akrapovic may offer slightly more gains over a normal sports back box. The back box isnt where th restriction is in the system but cant do any harm to change and get the gases flowing better

    Cat back systems
    These systems offer a better gain over just a back box as they step up the factory bore to 2.25" or bigger depending on manufactor which increases performance and noise, also the added bonus of being stainless steel from the cat back giving extra life to the exhaust system

    Turbo back inc Sport cats
    Okay, this is where the best gains are to be had by changing the factory cat over to a more free flowing sport cat item with less cells and there for offering the best gains. Cats aint cheap but if your chasing every last pony this is def the way to go, changing the cat will also slightly alter the exhaust note

    At the end of the day most of the exhausts will perform fairly close with maybe one or two out performing others by a few ponies, its just up to you to pick one you like the look n sound of and are happy paying the price as some arent cheap by any means! But a good quality, good sounding exhaust will always add great appeal to your car :thumb:
    FWD_Boy - AKA 'Chris'

    Offline Ricey155

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    Re: Exhausts
    « Reply #33 on: October 27, 2011, 09:23:07 pm »
    decent relpy FWD  :thumb:

    its all stress  ::)
    Sold my 59 plate after 8 years 9 months (Aug 2018) £5500
    my blog ~ http://fiat500abarth.wordpress.com/

    Offline paulos

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    Re: Exhausts
    « Reply #34 on: October 27, 2011, 10:42:47 pm »
    As far as cats go, we are now governed by regulations as follows if anyone is interested:-
    http://www.dft.gov.uk/vca/additional/files/enforcement-and-research-activities/replacement-cat/replacement-cat-regulations.pdf#search="replacement cat"

    Love the thought behind the link, but i'm afraid the DfT doc didn't mean much to me ??? I guess the question is whether a 200 cell sports cat is within the regulations or not?

    I admired jonl's BTB at Silverstone while it was stationary, but really want to hear it on the go now :)

    And roughly how many pennies would we need to scrimp together to get Hippo's 'ultimate' stainless Monza package fitted with centre pipe and cat?
    A500 esseesse

    BTB Exhausts

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    Re: Exhausts
    « Reply #35 on: October 28, 2011, 08:17:47 am »
    As far as cats go, we are now governed by regulations as follows if anyone is interested:-
    http://www.dft.gov.uk/vca/additional/files/enforcement-and-research-activities/replacement-cat/replacement-cat-regulations.pdf#search="replacement cat"

    Love the thought behind the link, but i'm afraid the DfT doc didn't mean much to me ??? I guess the question is whether a 200 cell sports cat is within the regulations or not?

    I admired jonl's BTB at Silverstone while it was stationary, but really want to hear it on the go now :)

    And roughly how many pennies would we need to scrimp together to get Hippo's 'ultimate' stainless Monza package fitted with centre pipe and cat?
    It is my understanding that any replacement cat needs to be a homologated part and proven to meet the emissions requirement for that particular car. For an exhaust manufacturer like us, the penalties that could be applied should we be caught selling a non-approved part are severe. It is not impossible to get approval for an aftermarket cat, but it costs a lot, and you have to do it for every specific model, rather than just once as a generic "one size fits all" part.
    I am sure there will be other companies that will supply sports cats, but it's not worth the risk to my company. I expect the same rules will eventully be applied to the rest of the exhaust, but hopefully not for a while.

    Offline Hippo

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    Re: Exhausts
    « Reply #36 on: October 28, 2011, 08:33:02 am »
    You should have no fear of a 200 cell cat not passing MOT regs as they stand.

    A sports cat also significantly raises noise levels. (7bd in my case according to my dodgy iPhone app. That's too much for most track days)

    Regs wise, be careful of a straight through system. If may fail on noise level tests. (Most of us with them know we may have to cut in a silencer to pass)

    My ultimate package would be about £1700 fitted.


    Offline Ricey155

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    Re: Exhausts
    « Reply #37 on: October 28, 2011, 09:20:57 am »
    To be honest 6 months of having no silencer / group N style back box im ready for some peace and quiet  :o

    Sold my 59 plate after 8 years 9 months (Aug 2018) £5500
    my blog ~ http://fiat500abarth.wordpress.com/

    Offline FWD_Boy

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    Re: Exhausts
    « Reply #38 on: October 28, 2011, 03:10:50 pm »
    Any of the sports exhausts matted to a sport cat should see you meet the noise regs for track work, you could always take your iPhone app and take yourself along to a meet and do some testing with members who have gone for aftermarket systems :thumb:
    FWD_Boy - AKA 'Chris'

     

    hungry