displaying posts 1 to 6 of 6

Author Subject: 2.25" exhaust BHP limit.
matty_rallye

Senior User

Location: Devizes

Registered: 28 Oct 2005

Posts: 966

Status: Offline

Post #1
Having changed the exhaust manifold on the rallye i will need to get the map changed again. Before i do this i want to know if anyone is aware of whether a 2.25" exhaust on n/a engine becomes restrictive once your are at around 230bhp? If so i will have to change to a 2.5" system but dont really want to do this if the 2.25" system isnt going to be restrictive?

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2.1 16v 306 Rallye.
Posted 13th Aug 2011 at 15:11
matty_rallye

Senior User

Location: Devizes

Registered: 28 Oct 2005

Posts: 966

Status: Offline

Post #2
Bump, anyone?

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2.1 16v 306 Rallye.
Posted 14th Aug 2011 at 17:21
bigbadbowen

Seasoned Pro

Location: Winchester

Registered: 21 Nov 2003

Posts: 13,752

Status: Offline

Post #3
Deff need 2.5 inch bud I was running exactly that when on tbs and my race engine
Posted 14th Aug 2011 at 17:24
welshpug!

Capt Pedantic

Location: Bigend, Wales.

Registered: 27 Mar 2007

Posts: 25,817

Status: Offline

Post #4
ask whoever made your manifold or built your engone?

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Posted 14th Aug 2011 at 17:52
allanallen

Seasoned Pro

Location: Buxton

Registered: 01 May 2007

Posts: 1,399

Status: Offline

Post #5
As long as you have a 2.5" downpipe and it's a decent system (straight through silencers,mandrel bends) I'd say it'll be fine.

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www.bridgecraftmotorsport.co.uk

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Posted 14th Aug 2011 at 18:04
matty_rallye

Senior User

Location: Devizes

Registered: 28 Oct 2005

Posts: 966

Status: Offline

Post #6
welshpug! wrote:
ask whoever made your manifold or built your engone?


Picked up the 3 piece maniflow on the cheap second hand as there was a crack in one of the welds. Sandy built the engine so may have to get in contact with him, thought id ask here 1st though to see if anyone had an idea.

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2.1 16v 306 Rallye.
Posted 14th Aug 2011 at 23:16

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