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Author Subject: 4-2-1 gti6 manifold
phillipm

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Post #51
An exhaust being straight comes very far down the list compared to getting the right length and diameters/collector volumes in there.
In fact, there's only one place where it's pretty vital to have a 'straight' section

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Posted 17th Apr 2012 at 18:20
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fatlapit

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Post #52
i didnt mention length mate Wink but the straighter the pipe the better the flow/less restrictions on a 4 stroke anyway

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Posted 17th Apr 2012 at 18:44
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fatlapit

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Post #53
the only reason to bend a pipe is for obstructions and for meeting other exhaust components, however bends can be used to "tune" exhaust flow and therefore the noise.

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Posted 17th Apr 2012 at 18:47
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ryangti6

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Post #54
Bends like on a 6 manifold are surely there to create length though otherwise it seems like Peugeot went to a lot of hassle for no point by what you are saying...

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Posted 17th Apr 2012 at 18:53
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bigbadbowen

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Post #55
ryangti6 wrote:
Bends like on a 6 manifold are surely there to create length though otherwise it seems like Peugeot went to a lot of hassle for no point by what you are saying...


Noise and economy are a factor as well ?

Posted 17th Apr 2012 at 18:58
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ryangti6

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Post #56
Economy yes as that will go hand in hand with efficiency but I cant see them going to that much hassle to design a unique manifold for the 6 engine to change the noise.

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Posted 17th Apr 2012 at 19:01
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swiftyboi006

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Post #57
Still go with what i posted on page 1

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Posted 17th Apr 2012 at 19:02
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fatlapit

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Post #58
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ nail on head

plus space, and cost, if you rip one apart and look at it interally there not that bad but they arent great either, dont get me wrong its better than a cast log manifold much like the 205 gti engines but i would expext the standard gti6 manifold to be working very hars for a high boost conversion, its obviously works but it always could be better and i think the 4-2-1 manifold has to be better than stock.

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Posted 17th Apr 2012 at 19:04
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fatlapit

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Post #59
swiftyboi006 wrote:
Still go with what i posted on page 1


the engine is basically a pump, if you make it harder for it to work it has to have less power maybe not on a standard motor but defo a modified one (i dont mean a k&n and a decat).Dunno

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Posted 17th Apr 2012 at 19:07
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buzzbrightyear

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Post #60
Or what about a new 4-2-1 that is designed for supercharged high boost?
Made by one of the proper exhaust builders that make them for all the f1, btcc and other racing cars eg (ie not power flow or longlife that just build an exhaust to fit with no science actually going into it)

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andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
Posted 17th Apr 2012 at 19:07
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fatlapit

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Post #61
that 4-2-1- sould be more than enough for a sc hb imo

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Posted 17th Apr 2012 at 19:08
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ryangti6

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Post #62
Just to be clear I totally agree with the above, I was referring more to the bends vs straight discussion. To me it seems obvious that if Stan had a manifold specifically designed for his car not a standard 6 it would be better.

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Posted 17th Apr 2012 at 19:09
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buzzbrightyear

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Post #63
I wasn't sure if the science would be different for a s/c car and if it would be better getting one designed from scratch

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andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
Posted 17th Apr 2012 at 19:10
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welshpug!

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Post #64
that's what I meant, all those manifolds and exhausts I posted are from a lad who makes them for race and rally cars since he was in school.

any of those off the shelf things wont be of much benefit to your engine.

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Posted 17th Apr 2012 at 19:10
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fatlapit

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Post #65
principles are the same, back pressures, scavenging, heat,noise, economy etc

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Posted 17th Apr 2012 at 19:11
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welshpug!

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Post #66
but the end result will be very different as its boost, hence a lot more air going through for a given rpm, all the pulses will be pretty different to a naturally aspirated engine.

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Posted 17th Apr 2012 at 19:12
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buzzbrightyear

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Post #67
or spend a grand on a dp manifold and stick a little turbo on there aswell as the rotrex!

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andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
Posted 17th Apr 2012 at 19:12
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buzzbrightyear

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Post #68
welshpug! wrote:
but the end result will be very different as its boost, hence a lot more air going through for a given rpm, all the pulses will be pretty different to a naturally aspirated engine.


This is what I'm thinking, the science in it.
For £900 I'm sure you could get one built actually designed scientifically for the build I'm running.

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andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
Posted 17th Apr 2012 at 19:13
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fatlapit

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Post #69
worked for lancia

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Posted 17th Apr 2012 at 19:14
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buzzbrightyear

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Post #70
What did?
What I just suggested?

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andrew315rawson@live.co.uk
Moonstone phase 7 gti6
My Project thread: http://www.306gti6.com/forum/showthread.php?id=119992&page=1
Posted 17th Apr 2012 at 19:15
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fatlapit

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Post #71
welshpug! wrote:
but the end result will be very different as its boost, hence a lot more air going through for a given rpm, all the pulses will be pretty different to a naturally aspirated engine.


in what sense, back pressure is still very key, as is primary length and aslo equal lengths and pairing the cylinders at the 4-2 bit

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Posted 17th Apr 2012 at 19:16
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welshpug!

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Post #72
yeap, and VW.

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need a part number? get on here - http://public.servicebox.peugeot.com

Bring on the Trumpets.

Posted 17th Apr 2012 at 19:16
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eliotrw

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Post #73
I would have thought 900 would get you a lot, a akrapovic titanium exhaust would be about 2k so you would hope so

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Posted 17th Apr 2012 at 19:16
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atterz

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Post #74
Supercharger and turbocharger Smile

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Posted 17th Apr 2012 at 19:16
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fatlapit

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Post #75
something for rich to think about but you will need a clever valve ststem

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Posted 17th Apr 2012 at 19:17
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