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Author Subject: Modified inlet manifold (Now fitted)
daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

Status: Offline

Post #1
Going to have a go at getting more flow through my manifold so got started today by chopping the plenum chamber in half with a bandsaw! This exposed some rough, nasty looking trumpets just ripe for slicing off with my plasma cutterCool Will post pics when Chris come round and shows me how to do it again!LOL

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Posted 26th Oct 2008 at 06:35
aperrott

Regular

Location: the north

Registered: 11 Dec 2007

Posts: 269

Status: Offline

Post #2
has anyone done a before and after rolling road of this mod (done wellWhistle ?)
Posted 4th Oct 2008 at 00:11
daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

Status: Offline

Post #3
Longmans may have, I was told that they were the first to try this mod. Dont know how true that is.

________________________________________

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.

Some of my services: (See my for sale threads)
Engine mount/chassis repair
Solid Beam Mounts BACK IN PRODUCTION
Harness bars
Posted 4th Oct 2008 at 08:03
daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

Status: Offline

Post #4


________________________________________

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.

Some of my services: (See my for sale threads)
Engine mount/chassis repair
Solid Beam Mounts BACK IN PRODUCTION
Harness bars
Posted 4th Oct 2008 at 22:30
mechanical_repairs

Seasoned Pro

Location: leicester

Registered: 10 Jan 2005

Posts: 12,122

Status: Offline

Post #5
I spy a snap on screw driver???


Carl

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Posted 4th Oct 2008 at 22:38
midlife

Seasoned Pro

Location: Colne, Lancashire

Registered: 13 Mar 2006

Posts: 7,544

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Post #6
Well done Dave, keep it upThumbs up

Perhaps this thread should be moved to projectsDunno

Cool

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Posted 4th Oct 2008 at 22:49
daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

Status: Offline

Post #7
Somebody knows their toolsWhistle

________________________________________

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.

Some of my services: (See my for sale threads)
Engine mount/chassis repair
Solid Beam Mounts BACK IN PRODUCTION
Harness bars
Posted 4th Oct 2008 at 23:29
gtisid

Seasoned Pro

Location: chelmsford

Registered: 22 Mar 2003

Posts: 4,992

Status: Offline

Post #8
what happened to the other fella that cut his open and went to town on it? he sounded like he was going to do the whole thing with chopping the trumpets off and polishing it but he hasnt been on here for ages.
you can expect to see 18-20 hp out of this mod if done properly. i have a longmans one on mine and it is the best mod i have by far

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Posted 4th Oct 2008 at 23:46
soton_s16

Senior User

Location: Southampton

Registered: 18 Jun 2007

Posts: 703

Status: Offline

Post #9
gtisid wrote:
you can expect to see 18-20 hp out of this mod if done properly. i have a longmans one on mine and it is the best mod i have by far

That much!? Unsure Blimey!Cool

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Posted 5th Oct 2008 at 00:37
rikky

Forum Pikey

Location: cheshire

Registered: 28 Feb 2004

Posts: 26,785

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Post #10
+18bhp just from that??

how are longmans doing it? cutting it and rewelding it or some other nifty method?

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Posted 5th Oct 2008 at 00:41
SteviePut

Seasoned Pro

Location: Down south

Registered: 20 Oct 2005

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Post #11
One for one of you techys out there. . . If you were to extend the manifold and increase it's capacity, would it be beneficial?

Or how about a twin throttle arrangement? i.e one at each end? And then split it in two? So one throttle = 2 cylinders? A lot of work but i guess it could be done. Although the sensor side of things could prove tricky. Then there's the cost V's gain too I guessConfused LOL

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Posted 5th Oct 2008 at 00:49
rikky

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Location: cheshire

Registered: 28 Feb 2004

Posts: 26,785

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Post #12
reminds me of bonos elise bodies on his maxi i believe, looks like a work of art

________________________________________

306 rallye reproduction decals (full sets/individual decals) | 306 b-pillar textured vinyl weatherstrips
306 slam panel esso stickers | 306 yellow / orange / pension fund red side door badges
306 red '6' 3d-printed badges (old part no 866503) | gti6 inlet manifold badges | 306 rear boot badges (p2/p3)
winner of Extraction of toys from prams with outstanding vigour award 2009 [source: gti6 owners club]
Posted 5th Oct 2008 at 00:52
crossflow

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Location: England

Registered: 21 Jan 2008

Posts: 159

Status: Offline

Post #13
SteviePut wrote:
One for one of you techys out there. . . If you were to extend the manifold and increase it's capacity, would it be beneficial?

Or how about a twin throttle arrangement? i.e one at each end? And then split it in two? So one throttle = 2 cylinders? A lot of work but i guess it could be done. Although the sensor side of things could prove tricky. Then there's the cost V's gain too I guessConfused LOL


well unless you have a restrictor on the trottle body there isn't much point getting a larger volume plenum. Extending the inlet tracks could be beneficial for torque but not power so you would be gain more drivability more than power.
The two trottle set up won't work due to areodynamics in the plenum but if you were to joint the 4 inlets together with a small diameter pipes you are equalising the pressure between them and you might see a gain but it's all down to the wave lenghts in the plenum
Posted 5th Oct 2008 at 01:01
gtisid

Seasoned Pro

Location: chelmsford

Registered: 22 Mar 2003

Posts: 4,992

Status: Offline

Post #14
longmans do cut it open, remove trumpets, and expand the chamber as the walls of my inlet feel very thin and then weld it back together. they also polish it inside and down the tube part (increasing their sizes port the throttle body too removing the d shape of the body to make a larger circle. i assume they change the gubbins in the throttle body aswell. it is supposed to work in conjunction with a custom made carbon airbox (not the bmc tat) only i couldnt get that to fit without extensive mods to rad, clutch,battery box and a couple of other things. still a good mod but can work out quite dear with longmans . 350 for the manifold and 180 for the throttle body if i remember rightly. i run mine with a 57i kit which has been the best of the 3-4 methods i have used

________________________________________

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Phase 1 GTI 6 1996-1997
Subaru Impreza GB270 2007-2008
rare spiderman comics
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Posted 5th Oct 2008 at 03:21
chris with a pug

Seasoned Pro

Location: Southampton

Registered: 16 Feb 2003

Posts: 5,366

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Post #15
mechanical_repairs wrote:
I spy a snap on screw driver???


Carl


And he gets well upset when you hit them with a hammer

Posted 5th Oct 2008 at 04:58
phillipm

Seasoned Pro

Location: Rotherham

Registered: 15 Oct 2006

Posts: 20,601

Status: Offline

Post #16
A bigger airbos is normally a good thing, so long as you can work to keep the pulse tuning the same, hence the weird and wonderful shape airboxes on bikes these days - gets the capacity up, but keeps the pulse lenth front the runners low.


Caution, above post may not make sense, very p*ssed

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Posted 5th Oct 2008 at 05:07
306andy

Senior User

Location: Derby

Registered: 01 Dec 2007

Posts: 631

Status: Offline

Post #17
I'm in the process of finishing this off, just need it TIG welding back up Big grin

I cut the "trumpets" down to about a 5mm collar and have blocked off the resonator box

If any one wants pics...PM me

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Posted 5th Oct 2008 at 05:13
midlife

Seasoned Pro

Location: Colne, Lancashire

Registered: 13 Mar 2006

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Post #18
306andy wrote:

If any one wants pics...PM me


Get em posted up andyThumbs up

Cool

________________________________________

Get used to seeing the yellow one !!!MehMehMehMehMeh
Team 330Cool
Team "no front end or engine"
Team "LIMITED EDITION" I live for the 306 stickerSmug
Team 0-60 in 6.44 & standing qtr in 14.808 @ 94.55mph all with std engineSmug
203bhp Corolla T-Sport daily driver stealthier than Kwai Chang Caine
Posted 5th Oct 2008 at 05:29
chris with a pug

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Location: Southampton

Registered: 16 Feb 2003

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Post #19
What does the resonator box actually do? When he does this is it worth blocking the hole off
Posted 5th Oct 2008 at 17:14
puglover Banned!

Location: Far out there

Registered: 08 Jun 2006

Posts: 6,096

Status: Offline

Post #20
the resonater box as far as i know helps to keep an even air distrubution to the cylinders and give it the engine note, no gains from taking it off so i wouldnt do it, and neither did longmans. This mod with throttle body though is well worth it transformed my car totally.

On a modded head and camed/remapped engine i have no doubt it is as good as throttle bodies.

Think you will sacrifice some low down torque though for a a rev happy engine with more top end. Pug designed that inlet for a reason. Yes

Changed mine over and sold it to GTISID and when i did my engine went to sleep Tired
Posted 5th Oct 2008 at 17:44
mechanical_repairs

Seasoned Pro

Location: leicester

Registered: 10 Jan 2005

Posts: 12,122

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Post #21
Yeah post the pics up fella, i would like to see it, make sure you put some other tools in the shot tooLOL

Carl

________________________________________

C.G.Cars of Leicester, Peugeot/Citroen/Renault specialist Tel: 01162 624498/07799 405184 WWW.CGCARSLEICESTER.CO.UK
36 narborough road south, Leicester LE3 2fn

MOT station now open, tests £35 with a free retest.
Recovery available with a recovery unit, for those not so local jobs

Also offer the loan of a free courtesy car 306 dturbo
Posted 5th Oct 2008 at 17:48
daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

Status: Offline

Post #22
The larger throttle body that Longmans supply, is that a stand-alone mod or do you need a remap or other work to make it go. Just wondering if its a straight bolt-on job. (As those are the kind I likeLOL )

________________________________________

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.

Some of my services: (See my for sale threads)
Engine mount/chassis repair
Solid Beam Mounts BACK IN PRODUCTION
Harness bars
Posted 5th Oct 2008 at 20:29
SteviePut

Seasoned Pro

Location: Down south

Registered: 20 Oct 2005

Posts: 13,637

Status: Offline

Post #23
quote:
Think you will sacrifice some low down torque though for a a rev happy engine with more top end. Pug designed that inlet for a reason.


But that's not to say it can't be improved tho. After all as good as it may be standard, it was still a compromiseYes

________________________________________

My old man wrote me a letter from prison once. It said if you don't want to end up in here, stay away from crime, women and drugs. Trouble is, that don't leave you much else to do, does it?
Posted 5th Oct 2008 at 20:37
collis

Regular

Location: southampton

Registered: 09 Aug 2007

Posts: 182

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Post #24
Stealing the thread here abit but does anyone local to southampton that i can buy a inlet manifold off because i got some spare time in my apprenticeship and want to have a play with it

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Posted 5th Oct 2008 at 20:45
chris with a pug

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Location: Southampton

Registered: 16 Feb 2003

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Post #25
collis wrote:
Stealing the thread here abit but does anyone local to southampton that i can buy a inlet manifold off because i got some spare time in my apprenticeship and want to have a play with it


When do you need it?
The one Jim cutting up is mine, so when he puts it on might be one avaliable.
Posted 5th Oct 2008 at 21:08

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