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Topic: 231bhp rallye

dans16 Regular Location: spalding Registered: Aug 07 Posts: 155 Status: Offline	Post #1 im getting 231bhp out my rallye and im on a standard exhaust system but been told can get 245/250bhp with uprated system and manifold but need a 2.5" bore all way though manifod and system does anyone no were can get one from?
Posted Mon, 8 Feb 10 22:45  | Profile

puglover Seasoned Pro Location: Far out there Registered: Jun 06 Posts: 5861 Status: Offline	Post #2 just buy an old magnex or get one custom made. Dont really need 2.5 manifold its right enough. ____________________ With the thoughts from a militant mind... hardline hardline after hardline
Posted Mon, 8 Feb 10 19:13  | Profile

daveyboy Seasoned Pro Location: Southampton Registered: Sep 07 Posts: 3722 Status: Offline

Post #3 Don't f*ck around, get in contact with Maniflow in Salisbury, they make a very nice system for the 306 and it has been used in several high power N/A setups, they may have done the BTCC ones too but I'm not sure about that. ____________________ R H Davey Welding Supplies. I sell new and used welding equipment in the Hampshire area. I take on welding jobs in the evenings, ally casting repairs are one of my specialities but I can weld pretty much anything. PM me with your requirements. Track vids: Session1 Session2 Some of my services: (See my for sale threads) Solid Beam Mounts CURRENTLY ALL SOLD, More Available Soon Cracked engine mount repairs and DIY repair kits ITB Heatshields

Posted Mon, 8 Feb 10 19:16  | Profile

matt h 306 Regular Location: Wiltshire Registered: Sep 03 Posts: 329 Status: Offline	Post #4 Maniflow will be able to build you an exhaust to suit And yes it has been know at around 230 bhp for the standard exhaust to hold it back on an n/a set up. edit, daveyboy beat me to it.
Posted Mon, 8 Feb 10 19:20  | Profile

fordygti Junior User Location: kings lynn Registered: Dec 09 Posts: 65 Status: Offline	Post #5 Have got a magnex system with a de-cat. A good system!
Posted Mon, 8 Feb 10 21:38  | Profile

dans16 Regular Location: spalding Registered: Aug 07 Posts: 155 Status: Offline	Post #6 is that with a 2.5" bore all the way though?
Posted Mon, 8 Feb 10 21:40  | Profile

jonnyboy17 Seasoned Pro Location: Wisbech Registered: Mar 09 Posts: 1179 Status: Offline	Post #7 try powerflow mate.. get them to custom build you a system.. got a custom built one on mine and its spot on ____________________ Team Dirty Black... Formerly Known as Astor   sharland wrote: When women don't behave like they do on brazzers.com in real life it disappoints me.   rikky wrote: the day i own a credit card is the day i saw my helmet off and fire it from a potato cannon
Posted Mon, 8 Feb 10 21:42  | Profile

fordygti Junior User Location: kings lynn Registered: Dec 09 Posts: 65 Status: Offline	Post #8 Sure is mate, i had a 2" powerflow on there before and that was ok but the magnex is a hundred times better!
Posted Mon, 8 Feb 10 21:45  | Profile

mxcrazy Regular Location: hastings Registered: Jun 09 Posts: 415 Status: Offline

Post #9 Its the actual manifold that is the main restriction, its not designed for anything other than a stock engine, on stock cams, stock induction etc etc. Before anyone disagrees, yesss, its does work with other combinations, but if you seriously look at manifold design you'll see that simple cam advance/retard can warrant different header lengths and/or diameters etc, depending on exactly your engine spec. Ive just sat for over an hour with a pen and a calculator looking at different variations with different cams spec, cc's, and rev ranges. For instance the variation in primary length was nigh on 10 inches different between aiming for 6500rpm (MAX BHP ISH) and 4900 rpm (FOR TORQUE) Its something i am definitely going to look into regarding my 2139cc build on bodies and cams, whether there is gains to be had from modification of the stock manifold, lengths wise, or if different primary internal diameters are going to be needed aswell as length, necessitating a bespoke manifold. ____________________ 88mm 11.5:1 pistons for sale, 88mm head gasket for sale, xsara rack for sale, pm me.

Posted Mon, 8 Feb 10 22:06  | Profile

dans16 Regular Location: spalding Registered: Aug 07 Posts: 155 Status: Offline	Post #10 ok im sorry mate but most of that went straight over my head i just been told by mat at pug1off i going to need to upgrade my manifold and system to 2.5" bored all way though
Posted Mon, 8 Feb 10 22:46  | Profile

mxcrazy Regular Location: hastings Registered: Jun 09 Posts: 415 Status: Offline

Post #11   dans16 wrote: ok im sorry mate but most of that went straight over my head i just been told by mat at pug1off i going to need to upgrade my manifold and system to 2.5" bored all way though Manifold upgrade is what im talking about, you need to talk to someone that really knows how to design/build a manifold to suit your engine though, to get the most from it. no point in bolting an 'insert manufacturer here' manifold on designed to run with some other spec engine to yours, again, yes it may work better than the original, but i guess with the amount you have spent on it all ready it would be stupid not to have a manifold made to meet the requirments/spec of your engine, ............... unless it is that close in spec to an engine that an off the shelf manifold has been designed for that will work to (for example) 95% efficiency. Overall exhaust length is also key, aswell as silencer/box placement and size. Id have a good look at getting a complete system made to suit your exact needs, it 'will' cost you to have done properly though. These 'exhaust' shops that do custom fitment exhausts, build it to fit the car and make the right noise for you, they dont build it to get the maximum from your particular engine set up. Someone like maniflow im sure will be able to advise you on both manifold design and complete exhaust system sizes, and make it for you. there are other people too, but they are normally found working on race cars, like maniflow, not road cars! ____________________ 88mm 11.5:1 pistons for sale, 88mm head gasket for sale, xsara rack for sale, pm me.

Posted Mon, 8 Feb 10 23:04  | Profile

dans16 Regular Location: spalding Registered: Aug 07 Posts: 155 Status: Offline	Post #12 o right ok thanx for the great advise mate get what you mean now cheers
Posted Mon, 8 Feb 10 23:16  | Profile

allanallen Regular Location: Buxton ,Derbyshire Registered: May 07 Posts: 237 Status: Offline	Post #13   dans16 wrote: is that with a 2.5" bore all the way though? Magnex systems are 2.5" but have a 2" section where the mid section and de-cat/cat connect. Spoox have some tasty looking manifolds on their site. Not sure who makes them though or if they're any good. Allan ____________________ Supercharged 205 mi16 309 gti6 306 garage ornament
Posted Mon, 8 Feb 10 23:52  | Profile

fletch Track Head Location: Whuppp Tiscchh Heaven Registered: Jun 04 Posts: 11845 Status: Offline	Post #14   allanallen wrote:   dans16 wrote: is that with a 2.5" bore all the way though? Magnex systems are 2.5" but have a 2" section where the mid section and de-cat/cat connect. Spoox have some tasty looking manifolds on their site. Not sure who makes them though or if they're any good. Allan 2.25 inch ____________________ Engine crane/engine stand for rent in South Yorkshire
Posted Tue, 9 Feb 10 9:17  | Profile

anth Seasoned Pro Location: colchester Registered: Apr 06 Posts: 2520 Status: Offline	Post #15 Go to a decent exhaust company if your running that sort of power, i.e not magnex, scorpion, powerlow, longlife... Maniflow seem to have a very good reputation for building exhaust for specfic outputs. ____________________ P1 Dturbo P2 GTi6
Posted Tue, 9 Feb 10 10:09  | Profile

allanallen Regular Location: Buxton ,Derbyshire Registered: May 07 Posts: 237 Status: Offline

Post #16   fletch wrote:   allanallen wrote:   dans16 wrote: is that with a 2.5" bore all the way though? Magnex systems are 2.5" but have a 2" section where the mid section and de-cat/cat connect. Spoox have some tasty looking manifolds on their site. Not sure who makes them though or if they're any good. Allan 2.25 inch Sorry my bad ____________________ Supercharged 205 mi16 309 gti6 306 garage ornament

Posted Tue, 9 Feb 10 16:31  | Profile

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