pslewis

What the hell are headers??

I am assuming that they are - what I call - Exhaust Manifolds, would that be true?

For years I haven't heard anything about them, now - there are posts daily ... why now?

Is it simply another method to part a fool from his money??

Pete

pippyrips

in short yes they are - they do make a difference though...

pslewis

Right, so why not call them Exhaust Manifolds then?

Where the hell did the name Headers come from?

And in the 1970's we were polishing and porting manifolds in an attempt to go faster!! ................. I've grown up now

Pete

^OPM^

always wondered myself why they call them headers and not exhaust manifolds

pslewis

It's the same with a lot of things ..... it gives a 'Specialist' feel to the item AND allows those making them to add £££££££££££'s to the prices!!

Why 'Headers' WHY????

Why not call a BackBox a 'Lower' then???

I don't know, you kiddies ............

Pete

cookstar

iTrader: (6)

A believe they are called headers, due to being on a flat four engine.

When my brother was messing about with beetles in his youth they where also refered to as headers.


I may be wrong

Gutmann pug

Just another in style buzz word to take £1500 out of your pocket ..... including the required re-map of course

The Zohan

stop trolling old man!

alloy

Keep up with the times mate

BlueSimon

There called headers probably for the same reason turbo's are called turbo's instead of 'exhaust driven precompression of intake gasses' or even 'exhaust turbine driven supercharger'



Simon

Peanuts

iTrader: (15)

headers because they bolt from the turbo to the heads perhaps?

Gutmann pug

Manifold because a man fits them and has to fold stuff too?

edmy716

425

Gutmann pug

afternoon edmy716 ......ive missed you.....

425 including re-map thats cheap

Peanuts

iTrader: (15)

Hactually Gary, mine was £502 including a remap, I primarily bought mine for noise reduction, but the extra 20ft lbs sweetend the blow somewhat

agree to disagree on this one?

Gutmann pug

Thats not bad going peanuts. What bhp gain did you get just from the headers? If you know its 25lb ft of torque you must know the bhp too yeah?

Peanuts

iTrader: (15)

about 10 brake all said and done, give or take a couple.
but as we all know, bhp for show, torque for go

aaronhowe

I think the term "headers" came over from America. Not sure why they call them that but why do we call anything what we do

rossyboy

iTrader: (8)

Not sure if it came from America, but I have seen them referred to as that on the likes of American Hotrod and Overhaulin.

scoobyboy1

iTrader: (16)

Polishing and porting manifolds to make you faster was you Pete, next thing you know you will be getting your car mapped.

I blame ScoobyNet for my need for speed. I was happy with a standad Impreza until I came on here.

pslewis

In my day you would have had to MAP the POINTS!!!!

I did have a Dwell Angle Meter and Colourtune .... spent many childish hours adjusting the fuel/air mixture on the carb and adjusting the Points to get the right dwell angle - and - even - changing the timing a few degrees more advanced (until pinking was heard, then back off a touch).

Of course, all that cost a big fat £ZERO .... just time.

I cannot believe how anyone thinks a Re-Map is worth £500 Just for altering the Map with a program on a LapTop It's so bloody easy it should be practically FREE!!!

Then, out come the DET CANS to make-believe you are getting some form of 'SPECIALISED' Tune-Up the old Crypton Tuning Machines were the forerunner of all this .............

Anyway ..... HEADERS ..... now I know what they are, £500 for brand new exhaust manifolds and a complete re-map is, I guess, reasonable if you want it (but, lets be brutally honest ..... can you REALLY tell any difference?)

I doubt it .... it's simply a Placebo effect .... and, of course, the desire to try and convince yourself that you haven't just peeeeed £500 down the toilet!

pete

scoobyboy1

iTrader: (16)

I know its a pain in the **** to keep having the car mapped everytime you change something on the car, I wish I could map the car myself, but I aint that clever.

Im learning most of my mechanic skills on a Renault 5 GT turbo that is stuck in my lock up, its brilliant learning on something 16 years old with no stupid computers and no bloody MAF sensors, Its as easy as change standard part for uprated part, adjust fuel/air mixture on the carb and save yourself £700 on not paying for a remap.

If only everything it was that cheap and easy to do on the Scooby. Even you would probably be driving round in a 400bhp Scooby pete.

silent running

It's very simple - 'headers' is the Yankee term for the exhaust manifold. In a way it makes sense to call them something specific because it uses one word instead of two and more importantly there's no muddle between the inlet and exhaust manifold. I'm not particularly bothered which I use. Whichever more people understand I suppose.

Most other cars' manifolds are known as manifolds here in Britain, so I reckon it's because the Scoob ones have a different layout to normal manifolds, with the head end being split so far apart and then the whole lot feeding into an 'up-pipe' which is something I'd never heard of before I got my Scoob. If I didn't know any better (or is that worse LOL) I'd include the up-pipe as part of the manifold too.

Kenny.S

Dont believe i'm actually being dragged in by you Pete but you've just supported the reason for Det Cans!

In your words;
"changing the timing a few degrees more advanced (until pinking was heard, then back off a touch)."

The pinking you heard on your morris minor or what ever it was you used TUNE is exactly what kills an engine, buy the time it is audible to the naked ear the engine is has probably been crying out for help for some time and on the verge of melt down!

"Then, out come the DET CANS to make-believe you are getting some form of 'SPECIALISED' Tune-Up"

Think of them like a microphone, you can get close to pinking and hence the best possible performance from a given engine/setup rather than carve on the ignition wait till it nearly melts then knock it back a bit

pslewis

If its melting a Piston ... I can hear it!!

And nowadays the ECU does that testing the advance many times and retarding slightly to keep the timing perfect!

And please, no crap about the ECU being weak and not up to the job!

Pete

ps. Det. Cans. simply make you look like a right TIT-HEAD ... no other reason for them than that!!

StiX

iTrader: (4)

I had a 'remap' on Saturday @ Powerstation on my MY00.

230bhp/217lbft before

£658 later (bought a 3 port boost solenoid also)

272bhp/272lbft after.


Transformed the car, lovely to drive now. Smooth as can be, mid-range fantastic, much more shove in any gear.

I think, no I know it was worth it

Kenny.S

Pete you really are something else

I for one dont believe for a moment that you could hear a piston melting in an impreza! Unless you're hearing aids secretly act as det cans that is

Modern Ecu's do indeed adjust when knock or det is detected but they are not always quick to add it back on. Knock sensors can vary in sensitivity from one car to another so one car might be very quick to react to det where as another might allow it to continue for longer and potentially result in damage.
When you have a car mapped you can compare what the ecu is seeing via the knock sensor with what you can hear through the det cans and as such set the ignition, fuel and boost accordingly.

Rather than go down the route of most manufacturers subaru included and running the engine rich to protect it under high load condtions, det cans allow this excess fuel to be safely dialed out and the ignition timing to be fine tuned, a custom ecu map is always going to better than mass produced one!

Anyway, enough i'm going offshore tomorrow best get some sleep.

Peanuts

iTrader: (15)

my Apexi ecu doesnt advance or retard the ignition automatically.
So you need all possible stimuli to give as much advance warning of impending doom.

Kenny.S

I've also got an Apexi ecu, but i didn't want to tell Pete it doesn't advance or retard the ignition automatically as he will just think it is inferior to the fantastic subaru one

Can't believe i'm actually trying to talk sense into pslewis

pslewis

It doesn't even do what the standard one does??

So, basically you have LESS protection than running with the Subaru Supplied Standard ECU?? Bloody Hell ... no wonder you are paranoid about the thing going ****-up! SHOCKED!!!

I'll take just one snippet from your earlier post .... 'the knock sensors vary between cars' .... true (to a very tiny unoticeable degree, these things are Mass Produced in the East) - could you tell us by what tolerance they do actually differ?

As an Engineer I am intrigued by your claim and therefore you must have figures to back it up ........ please don't say, "It's just what I read on a website one day" because thats how untruths get spread by the gullible to the gullible.

Pete