Modified inlet manifold (Now fitted) - Engines Forum - Peugeot 306 GTi-6 & Rallye Owners Club

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Subject: Modified inlet manifold (Now fitted)

daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

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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 cutter Cool

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

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aperrott

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Location: the north

Registered: 11 Dec 2007

Posts: 269

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Post #2

has anyone done a before and after rolling road of this mod (done well Whistle

Posted 4th Oct 2008 at 00:11

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daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

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Post #3

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

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Posted 4th Oct 2008 at 08:03

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daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

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Post #4

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Posted 4th Oct 2008 at 22:30

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mechanical_repairs

Seasoned Pro

Location: leicester

Registered: 10 Jan 2005

Posts: 12,122

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Post #5

I spy a snap on screw driver???

Carl

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Posted 4th Oct 2008 at 22:38

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midlife

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Location: Colne, Lancashire

Registered: 13 Mar 2006

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Post #6

Well done Dave, keep it up Thumbs up

Perhaps this thread should be moved to projects Dunno

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Posted 4th Oct 2008 at 22:49

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daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

Status: Offline

Post #7

Somebody knows their tools Whistle

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Posted 4th Oct 2008 at 23:29

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gtisid

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Location: chelmsford

Registered: 22 Mar 2003

Posts: 4,992

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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

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soton_s16

Senior User

Location: Southampton

Registered: 18 Jun 2007

Posts: 703

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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!

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Posted 5th Oct 2008 at 00:37

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rikky 🦔

Location: cheshire

Registered: 28 Feb 2004

Posts: 26,793

Status: Offline

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

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SteviePut

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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 guess Confused

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Posted 5th Oct 2008 at 00:49

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rikky 🦔

Location: cheshire

Registered: 28 Feb 2004

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Post #12

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

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Posted 5th Oct 2008 at 00:52

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crossflow

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Location: England

Registered: 21 Jan 2008

Posts: 159

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Post #13

SteviePut wrote:

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

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gtisid

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Location: chelmsford

Registered: 22 Mar 2003

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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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Posted 5th Oct 2008 at 03:21

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chris with a pug

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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

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phillipm

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Location: Rotherham

Registered: 15 Oct 2006

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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

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306andy

Senior User

Location: Derby

Registered: 01 Dec 2007

Posts: 631

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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

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midlife

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Location: Colne, Lancashire

Registered: 13 Mar 2006

Posts: 7,544

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Post #18

306andy wrote:

If any one wants pics...PM me

Get em posted up andy Thumbs up

________________________________________

Get used to seeing the yellow one !!! Meh

Team 330�

Team "no front end or engine"
Team "LIMITED EDITION" I live for the 306 sticker Smug

Team 0-60 in 6.44 & standing qtr in 14.808 @ 94.55mph all with std engine Smug

203bhp Corolla T-Sport daily driver stealthier than Kwai Chang Caine

Posted 5th Oct 2008 at 05:29

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chris with a pug

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Location: Southampton

Registered: 16 Feb 2003

Posts: 5,366

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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

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puglover Banned!

Location: Far out there

Registered: 08 Jun 2006

Posts: 6,095

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

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mechanical_repairs

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Location: leicester

Registered: 10 Jan 2005

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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 too LOL

Carl

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Posted 5th Oct 2008 at 17:48

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daveyboy

aka Jim Davey

Location: Southampton

Registered: 01 Oct 2007

Posts: 8,648

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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 like LOL

)

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Posted 5th Oct 2008 at 20:29

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SteviePut

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Location: Down south

Registered: 20 Oct 2005

Posts: 13,637

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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 compromise Yes

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Posted 5th Oct 2008 at 20:37

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collis

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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

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chris with a pug

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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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