Longmans inlet manifold - Engines Forum - Peugeot 306 GTi-6 & Rallye Owners Club

Post #1

What exactly do (or did) Longmans do to the inlet?

A brief search suggests they cut it open and alter the trumpets

Is this worth getting done to a road engine, say with PT81's?

Post #2

Opened and removed the trumpets

Post #3

so realistically this could be done by any decent welder/fabricator?

what benefit does it give and are there any down sides?

Post #4

Was done to increase airflow but they also ran standalone management so the map sensor was also removed and other sensors not needed.

Post #5

ok. so with mild-ish cams and remap, it wouldnt be worth it would it?

Looking at ways to crack 200bhp N/A, 81's,pocketed pistons and map

Post #6

Wasnt this done and tested before and after mapping by someone on here? Sure i read about someone chopping the inlet open, chopping the trumpets off and welding it up and all he got was abit extra mid range? Not much benefits tho

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Post #7

extra mid range would be good as long as there's no loss anywhere else

Post #8

i heard when this is done with a new management system it can acheive more power than throttle boddies Confused

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97 1.6 xs gti6 conversion Smile

scrapped
99 black rallye ( low miles and immaculate Thumbs up

) sold
new owner of a 2001 diablo red hdi mile muncher Smile

swapped
99 red rallye turbo sold then died Sad

00 moonstone 1.9d (slow)

Post #9

if only it was as easy

Post #10

boost wrote:

i heard when this is done with a new management system it can acheive more power than throttle boddies Confused

Yeah but you need a racing engine to go with it Thumbs up

Post #12

That Dave bloke tried it. I think he lost a lot of midrange.

Need a high revving engine to make the most of it

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Team 'unintentional rat look'

Post #13

suppose youll see more gains running boost like

________________________________________

97 1.6 xs gti6 conversion Smile

scrapped
99 black rallye ( low miles and immaculate Thumbs up

) sold
new owner of a 2001 diablo red hdi mile muncher Smile

swapped
99 red rallye turbo sold then died Sad

00 moonstone 1.9d (slow)

Post #14

i doubt you'd need to do it if your running boost as engine is now - Forced inducted

Post #15

click here

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Post #16

that was an interesting read, seems its not worth doing unless your planning to go daft on other bits,

cams, management, head work etc

Post #17

I have a standard engine with a longmans inlet running on management and its 1/2 sec quicker than my other 205 on bodies down the quarter mile

Still prefer the sound of bodies tho

Post #18

im guessing its quicker becuase the standard long runners aid torque, but wait a minute, their shorter

if they've been de-trumpeted! this subject intrigues me

Post #19

Yeah there compleatly smooth inside with no trumpets

Post #20

how did it drive normally, ie other than caning it down the 1/4? loss in low to mid range torque?

Post #21

Shorter inlet tract to match the cam specs. Probably wouldn't loose quite as much down low as Jim did with a hopped up cam too.

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Post #22

It's absolutely rapid. It really does pull like a train all the way through the rev range

Post #23

so, to summarise, unless cams are uprated then its a pointless move, yes/no?!

Post #24

gti6girl wrote:

It's absolutely rapid. It really does pull like a train all the way through the rev range

rest of engine totally standard? other than exhaust

Post #25

Here it is having a run up Prescott hill

205 rallye