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Author Subject: 4-2-1 gti6 manifold
phillipm

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Post #101
daveyboy wrote:
phillipm wrote:
Funny that, my supplier always says he has loads in, they're over 100 quid a pack though. Got a15 stamped on the end........


I think he saw you coming Cool


Who told you!? He said that was a secret for a good price!

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Posted 24th Apr 2012 at 17:33
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buzzbrightyear

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Post #102
ADP wrote:

I have this manifold fitted to my rallye and it made one hell of a difference compared with the standard 1. The car is much more responsive and pulls much stronger. I did have to uprate the lower engine mount. The price seems to put people off but if you can get one second hand i would reccomend it.


What kind of joint does it use where it will meet the rest of the system?
Is it longer than the standard one?
Looks like it will meet up with the rest of system behind the subframe level with the floor/ transmission tunnel instead of up behind the engine?
Would you need a flexi on the rest of the system near to where it will meet this manifold?

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Posted 24th Apr 2012 at 18:47
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dangti6

aka JKshooter

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Registered: 15 Jun 2006

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Post #103
Looks like Andy is going to throw another 500 at the old girl.

Step away! LOL

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    • Posted 24th Apr 2012 at 18:48
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    buzzbrightyear

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    Post #104
    Laugh my ass off
    I need a ban

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    andrew315rawson@live.co.uk
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    Posted 24th Apr 2012 at 18:49
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    dangti6

    aka JKshooter

    Location: Taunton, Somerset

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    Post #105
    buzzbrightyear wrote:
    Laugh my ass off
    I need a ban


    JKshooter login details on their way

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    • Posted 24th Apr 2012 at 19:17
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    buzzbrightyear

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    Post #106
    LOL
    I bet that bloody joe mangel hasn't payed up either.

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    andrew315rawson@live.co.uk
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    Posted 24th Apr 2012 at 19:25
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    yippeekayay

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    Post #107
    buzzbrightyear wrote:
    ADP wrote:

    I have this manifold fitted to my rallye and it made one hell of a difference compared with the standard 1. The car is much more responsive and pulls much stronger. I did have to uprate the lower engine mount. The price seems to put people off but if you can get one second hand i would reccomend it.


    What kind of joint does it use where it will meet the rest of the system?
    Is it longer than the standard one?
    Looks like it will meet up with the rest of system behind the subframe level with the floor/ transmission tunnel instead of up behind the engine?
    Would you need a flexi on the rest of the system near to where it will meet this manifold?


    I have a whole system and 4 branch manifold 500+ miles use for sale was a great noise, though i never used it as hadnt got engine mapped.

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    Posted 24th Apr 2012 at 20:04
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    ADP

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    Post #108
    buzzbrightyear wrote:
    ADP wrote:

    I have this manifold fitted to my rallye and it made one hell of a difference compared with the standard 1. The car is much more responsive and pulls much stronger. I did have to uprate the lower engine mount. The price seems to put people off but if you can get one second hand i would reccomend it.


    What kind of joint does it use where it will meet the rest of the system?
    Is it longer than the standard one?
    Looks like it will meet up with the rest of system behind the subframe level with the floor/ transmission tunnel instead of up behind the engine?
    Would you need a flexi on the rest of the system near to where it will meet this manifold?


    The joint is the same as the pics earlier in the thread, goes from 2 into a clamp bracket and into a single where it joins my decat. Yes it is much longer and slightly heavier than the standard one. The subframe had to be dropped when it was fitted and the lower engine mount uprated to stop it knocking on the subframe and underneath of the car. Mine is a full maniflow system so it was a bolt on job Colin at pug performance did for me. All I can say is you won't be dissapointed but I wouldn't pay silly money for one! Wink
    Posted 24th Apr 2012 at 23:49
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    stan_306gti6 Forum Admin

    Location: Kent

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    Post #109
    Discussion moved to Exhausts. Smile

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    Posted 25th Apr 2012 at 23:49
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    buzzbrightyear

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    Post #110
    Ok so what differences would there be between a 4-1 manifold and a 4-2-1?
    I read that the lengths of the 4s and the 2s bit make a difference and are designed to suit the engine eg.

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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 28th Apr 2012 at 11:47
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    stan_306gti6 Forum Admin

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    Post #111
    Probably less of a bottle neck.

    If you are ramming 4 pulses of gas from 4 pipes into 1, there will be a traffic jam...if you're doing into 2 the congestion will be less. Smile

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    Posted 28th Apr 2012 at 13:23
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    miles

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    Post #112
    Torque and Power delivery will be at different RPM's

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    Posted 28th Apr 2012 at 13:37
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    buzzbrightyear

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    Post #113
    4-2-1 for more low down power or the opposite?

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    andrew315rawson@live.co.uk
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    Posted 28th Apr 2012 at 15:52
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    welshpug!

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    Post #114
    Depends very much on the design, all of mile's manifolds and Sandy's I've seen so far are 4-2.

    with a well designed collector you don't get the bottleneck that Stan mentions, don't forget you only get on pulse at a time anyway, if you get the length right...

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    Posted 28th Apr 2012 at 16:20
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    stan_306gti6 Forum Admin

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    Post #115
    welshpug! wrote:
    with a well designed collector you don't get the bottleneck that Stan mentions, don't forget you only get on pulse at a time anyway, if you get the length right...


    This is true, although there must be a reason why all performance manifolds that seem to be available for the 306 are 4-2-1. I guess its for freer flowing at the top end. But yes, you should only get one exhaust pulse at a time, given that each cylinder, should be doing something different to the others at the same given instance. Yes

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    Posted 28th Apr 2012 at 18:43
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    matty_rallye

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    Post #116
    I will be getting mine mapped again soon, now with a 4-2-1 maniflow as apposed to the standard manifold that was on there before, hoping to see an improvement but will have to wait and see.

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    Posted 28th Apr 2012 at 20:48
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    clen666

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    Post #117
    Be interesting to see the result Matty

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    Posted 28th Apr 2012 at 20:59
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    buzzbrightyear

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    Post #118
    can you post up results when it's done mate?

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    andrew315rawson@live.co.uk
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    Posted 28th Apr 2012 at 21:42
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    stan_306gti6 Forum Admin

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    Post #119
    buzzbrightyear wrote:
    can you post up results when it's done mate?


    I'm not sure its going to be a useful indication to the likes of you and me though Andy...

    Matty is running high power N/A vs our chargers.

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    Posted 28th Apr 2012 at 21:50
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    buzzbrightyear

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    Post #120
    yeah true but I'd still be interested of the results with the n/a engine.

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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 28th Apr 2012 at 21:53
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    clen666

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    Post #121
    With regards to exhaust, aren't supercharged applications more closely related to n/a than turbo?
    There are still exhaust pulses to factor in without a big turbo disrupting them

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    Posted 28th Apr 2012 at 22:13
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    stan_306gti6 Forum Admin

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    Post #122
    Indeed, it would certainly be interesting to see the difference. Yes

    Maybe with this mod and a rear diffuser the whole package could be improved tenfold! Cool

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    Posted 28th Apr 2012 at 22:14
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    clen666

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    Post #123
    That would be nice!

    But now who is going to design an exhaust system that doesn't interfere with a diffuser? LOL

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    Posted 28th Apr 2012 at 22:18
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    stan_306gti6 Forum Admin

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    Post #124
    clen666 wrote:
    With regards to exhaust, aren't supercharged applications more closely related to n/a than turbo?
    There are still exhaust pulses to factor in without a big turbo disrupting them


    Yes, but it is still forced induction therefore the gases will be moving much faster on the exit than N/A...

    N/A is looking for better ways of getting those gases to flow so that they exit quicker, whereas with a forced induction setup the gases are being blown out the chambers into the manifold at a much higher velocity therefore gas flow speed isn't such a great challenge to find as it is on N/A, which is why I would imagine you'll see a good gain with a 4-2-1 on an N/A car and not so much on a forced induction car.

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    Posted 28th Apr 2012 at 22:19
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    stan_306gti6 Forum Admin

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    Post #125
    clen666 wrote:
    That would be nice!

    But now who is going to design an exhaust system that doesn't interfere with a diffuser? LOL


    Adrian Newey. LOL

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    Posted 28th Apr 2012 at 22:21
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