hardsy555

as above just fitted these and a custom u/p WOW quite a difference, though it did take the SUBARU garage 6hrs to do it???. seems more progressive through the gears and it seems to of got rid of some lag as well. a worth while investment i think.. anyone else had this done and if so what do you think of the results........

exvaux

iTrader: (1)

6 hours labour,christ bet that cost you

mozzaITA

How much are these headers? where can they be bought, i did see one site and they were something stupid £1500 cant be right???

exvaux

iTrader: (1)

depends what make etc,but im sure there was a group buy on ported ones for under 500 quid

automodellistagt

manifolds.......

mozzaITA

Ok, i dont know much about them...... wheres best to get them from?

Mr Footlong

iTrader: (7)

Hopefully yours are all fitted properly. When I had a ported/heatwrapped set fitted to mine you could physically hear them leaking when cold. Subaru4you are going to take a look at them and fit them properly.

s5ooob

iTrader: (1)

Must be porting season... Just done mine.
I'm fortunate in having access to a die-grinder and tungsten carbide cutting tools at work.

It took only about 30mins to remove the manifold off the car, then a couple of hours to rough cut the ports back to the gasket line and remove the heat shield lugs with an angle grinder. The ports were then smoothed with a flap wheel, and it seemed rude not to make use of the shot-blaster at work, to clean the whole lot up before applying a few coats of high temp. paint and 100ft x 1" of heat wrap. the o.e. heat shield was then replaced over the wrap on the staight flexi-pipe.

Replacing the manifold requires bolting it loosely together until you have the two collectors secured to the cylinder heads, then you're able to tighten everything else up and it'll all pull together nicely. Replaced all gaskets with new, though could probably re-use the originals with no issues.

scottstiukppp

Nice job you done there mate

mgcvk

Thats a terrific job....but can you actually feel much difference to performance? Its a mod I've been considering for a while.

THOMO

a lot of money for spent " SEEMS more aggresive through the gears "
i would want the car to blow my mind for that money.

Anders_WR1

iTrader: (8)

I had a set of Harvey's headers and it made a great difference for the money. He does porting on an exchange basis for about £125, or about another £100 if you want them wrapped. I also fitted his £135 up-pipe later on which also made a good difference to spool and power delivery.

Would recommend ported headers to anyone.

Welloilbeefhooked

iTrader: (3)

Not really to much to be gained by having them as smooth a finish as shown above. Too rough and its not good for flow as we know, but they do look nice.

hardsy555

i agree ive just had this done and what a difference , untill youve had this it is a job to explain but the car seems more lively and exciting and as said seems to of got rid of a bit of the turbo leg?.... a very worth while mod in mho....pound for pound, a certain improvement in accelereation and driveability,imho.......................happy days.

hardsy555

what a load of ****e,who the hell is going to see them you complete t*t. and they do make a difference....... you obviously havnt had this done

Mr Footlong

iTrader: (7)

If you click on his 'View My Scooby' link you would see the following 'OE Ported Headers (My own work) – Wrapped'

hardsy555

**** off

Mr Footlong

iTrader: (7)

Nice.......

Simon 69

You Sir, are an imbecile.

Simon 69

Indeed.


People who are interested (and who arent able to do this themselves) might consider contacting Harvey Smith, who will be able to work his magic on their manifolds (or maybe send some immediately, on an exchange basis).

Simon

mozzaITA

Harvey smith??? is he on here?

Simon 69

He is yes, his user-name is Harvey.

Anders_WR1

iTrader: (8)

Here's Harvey's e-mail:

harveysmith1'at'btinternet.com

replace 'at' with @

Mr Footlong

iTrader: (7)

Erm, probably best removing that and sending via PM or rewording it before spam bots get hold of it from trawling here .

Slowboy Racing

We also stock OE ported headers at £95 exchange + Postage.

Welloilbeefhooked

iTrader: (3)

Ooops, obvioulsy upset him then!

They do make a difference on the car, having them ported that is. The finish above is probably a little over the top. You need them smooth just not that smooth thats all. I'm not saying that it hurts the gas flow, just that the gains (if any) of smoothing to that extent over the relatively smooth finish from a tungsten carbide cutter are not worth the extra effort.


Wayne.

Anders_WR1

iTrader: (8)

I think it's the removal of the lip on the headers where the headers and cylinder head don't match up that makes 95% of the difference.

Nice job above though!

I'd also recommend Harvey's up-pipe.

Anders

mgcvk

Yes I've been told that matching the headers is the most important thing and that you need a bit of roughness to help gas circulation. Can you go too smooth?

The rookie

iTrader: (1)

Yes, there are two types of flow, "laminar boundary layer" where each 'layer' of flow goes slightly faster the further from the wall/surface you get, all that shearing of the airflow causes more resistance than "turbulent boundary layer" where the flow right at the surface is unstable and random but creates less restriction the further from the wall/surface you get. A slight roughness to the wall encourages turbulent boundary layer flow, although to be honest that close to the valve there is probably plenty of energy in the flow to keep it doing that for a way downstream!

Simon

olliecampbell

iTrader: (3)

One for those that have done this:

Is a dremel up to the job?


EDIT: Wow rookie, some good info there...keep going!