Exhaust manifold (tubular)

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Apr 2, 2001 | 01:42 PM

Blackscooby

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From: Settle, Cheshire, Istanbul

Hi,

I know someone is going to tell me this is the wrong section....
but,

Does anyone know of the benefits of running with a tuned exhaust manifold, or does anyone run with onw ?

I've been given the chance to purchase a stainless steel block to turbo pipe which looks fantastic.

BUT does it give any advantage ?

Mark
UK 94
1.3bar
Mongoose SS (decat system)

Apr 2, 2001 | 01:48 PM

robski

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Is claimed to give more BHP (and I guess torque, but not sure where in the rev range)

however is suposed to loose the boxer sound, so needs to be worth more like 100bhp IMHO

robski

Apr 2, 2001 | 01:57 PM

Blackscooby

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From: Settle, Cheshire, Istanbul

Loose my lovely deep gravelly boxer sound ?
Noooooooooooooooooooooooooooooo

They guy said that it does alter the sound, but I thought it must make it better no worse !

Mark

Apr 2, 2001 | 02:39 PM

mutant_matt

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From: London

You won't loose the deepness (ooeerr!!) You will loose the lopsided burble....

Matt

Apr 2, 2001 | 02:50 PM

Blackscooby

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From: Settle, Cheshire, Istanbul

To be honest its the performance improvements I'm after rather than the audio gains

Apr 2, 2001 | 04:07 PM

NAF

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It depends on the manifold configuration.4-2-1 tube manifold configuration like BPM's,you will loose the boxer beat but if 4-1 tube configuration like OEM,then boxer beat is there,eg Zerosport.

But I am interested to know what kind of performance gains can be acheived from changing manifolds,eg turbo lag,low end torque,etc,etc.

Chan HT

Apr 2, 2001 | 04:24 PM

Dave T-S

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From: Newmarket Suffolk

Talk to Pete Croney - he has a rather trick one on his RA (but I agree it didn't sound as good as standard when I followed it up the road - for a few hundred yards, at least.....

)

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Apr 2, 2001 | 04:30 PM

EvilBevel

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Having driven with and behind a scoob with a PE manifold : it does sound a bit Hoover-ish below 4000 rpm, but sounds *very* good beyond that.

The car in question made 236 BHP (pretty normal) but ... 366 Nm torque with both cats still in place and no further tuning(apart from Scoobysport backbox). (RR comparable to PS)

Pete Croney can probably explain this better, but bear in mind that you can buy exhaust manifolds tuned for either torque or max BHP

Apr 2, 2001 | 05:12 PM

Sam Elassar

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hi mark

i have been looking at that an i also wouldn't like to loose the off beat sound. i know of a company that will port and flow all the standard manifold components reducing all the restrictions and i suppose that will probably be a lot cheaper than the PE one for example

.

evil
how much is 366Nm in bl/ft ? and how did other standard cars compare on the day ? so we can guestamite gains ? maybe

cheers

Apr 2, 2001 | 07:48 PM

#10

EvilBevel

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Sam, for your guestimate ... 366 Nm is about 268 lb/ft. My car made 273 lb/ft on that same rolling road, and that is with a VF23, 1.2 bar boost, Unichip, catless exhaust, etc..

This (Belgian) RR gave me 255 BHP (previous setup) while the car made 265 BHP at PS (still previous setup) 2 weeks later. With the new setup (VF23), it makes about 290 BHP on that RR.

Always difficult to compare - I really distrust RR's, but it does give you an a ballpark idea.