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Author Topic: Larger exhaust more boost ?  (Read 1246 times)

Offline Screech16v

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Larger exhaust more boost ?
« on: 29 January 2013, 23:55 »
Since replacing my exhaust I have noticed I have more peak boost was .8 bar  now over .9,old exhaust was standard mk3 16v but there was a section that was 2"  :shocked:. I now have a 2.5 stainless system decat and 3"downpipe how come I now have more boost? surely the exhaust wouldn't determin boost pressure would it? :undecided:
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Offline golfyste

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Re: Larger exhaust more boost ?
« Reply #1 on: 30 January 2013, 05:46 »
Not 100% sure but it might be that because there is less back pressure it is spinning the turbo up quicker and just spiking a little higher due to it being easier to spin......maybe  :laugh:
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Offline Granta Gti

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Re: Larger exhaust more boost ?
« Reply #2 on: 30 January 2013, 07:23 »
Mine seemed to do it when I fitted the eBay :" system I think it peaks quicker and then tails it back down. Cause it's doing it quicker and less restrictive it flows better and has more boost initially.
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Offline Prawny

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Re: Larger exhaust more boost ?
« Reply #3 on: 30 January 2013, 08:29 »
less restriction, allows the turbo to work more, 0.8 - 0.9 bar isn't a huge jump, I'd say it's more than possible.
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Offline Dalo Harkin

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Re: Larger exhaust more boost ?
« Reply #4 on: 30 January 2013, 08:44 »
It's the downpipe that does it, bigger downpipe = turbo spooling faster  :wink:
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Offline Screech16v

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Re: Larger exhaust more boost ?
« Reply #5 on: 30 January 2013, 20:13 »
Thank you for the replies ,it does seem to have a bit more tourque low down also.
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