PeterRST

iTrader: (1)

Hey there,

one of my mates is looking for a 4-2-1 or 4-1 exhaust manifold for his 1.8 16V Focus. What's the best place to buy and is it possible to fit one and still maintain the cat? We're from Germany so we have to keep it (emissions test every two years).

Any help is much appreciated!

Wardy257

It is not worth the effort on a standard 1.8 ZETEC as it will do nothing. Save your cash for something that will have a positive affect.

PeterRST

iTrader: (1)

It's not standard. It's got a induction kit and a full s/s exhaust.

Chip and some funky cams to follow...

Wardy257

Induction kit and exhaust will do nothing but make noise. There is no point fitting cams as the standard cams are good for 155+ bhp it is the mapping and poor inlet manifold that is holding the power back.

Tunning the ZETEC is not like an old CVH. You need to do everything in the right order or you will end up spending a lot of Łs for each BHP. So far you have spent a lot for nothing!!!!

PeterRST

iTrader: (1)

I've read through your web site a bit Wardy.

So basically what you're saying is, that I'd need to put on some throttle bodies and any other modification won't make sense until i get the "breathing" right?

Wardy257

Throttle boddies are the ultimate but you can buy and/or adapt other inlet manifolds. A common mod is the Rover Turbo inlet as the spacing is nearly spot on, you just need to make an adapter plate. You can use the Rover turbo injectors, TB etc and add an aftermarket ECU. It appears to be good enough to flow enough for 170+ bhp.

Some people use the ST170 inlet and motorbike TBs but that is mainly in RWD applications were space is not so much of an issue.

The problem is the standard inlet maxes out at around 150bhp so no matter what you do with cams, mapping etc you will only get 150 bhp.

jonyb4

wardy, your being bit a gammon slipper aobut it aint you? theres plenty of power to be had from the 1.8 with out going mental like TB's and rover inlets

ive seen plenty reach 150bhp without spending more than Ł500, im planning on doing the same with the 1.8 in my mk4 fez

id say give the four branch a go, it will free up the engine and allow it to rev freely without strangling it, ive had mates tell me it sounds better and not screaming at you as you hit 5k rpm

burton power do ones from Ashley but theyre close to Ł200, i know of cheaper but im trying to find them myself, heard of thema round Ł130, not sure about german retailers, but imsure you can get them posted oversea's

try and get a H.O inlet and 2.0 cams in it, then if costs aint an issue remap it after these, then it should see past 150bhp with a four branch easy, the focus's plastic inlet manifold is a bit small compared, if you cant get hold of a H.O cast inlet try the 2.0 mondeo plastic inlet if the focus brake link bar allows, i know fiesta ones dont...

on mine im using focus ST170 spark plugs, im after megnecor leads, coil packs on these are meant to be solid enough according to ian howells
ive got a decat back Stainless exhaust and induction kit with ERST charge carrier and H.O inlet, getting 2.0 cams soon and after a early mondeo 2.0 ecu (pre pats for obvious reasons) then a four branch, hopefully all this will see close enough to 150bhp

pee vee

Have a look at the ST170 exhaust manifold.. That's what I used on my old 2ltr zetec
Needs a little bit of work to match it to the rest of the exhaust.
They are a 4-2-1 design and pretty equal length etc.

They were mega cheap when I did it about 6 years ago, and it's ford parts so the quality is good. If it makes a difference or not is another matter. Lol

Pic

jonyb4

cheers mate, i have no idea where to look to get one of these, nto to mention the prices

pee vee

Your local ford dealer!

jonyb4

lol ill have a peek next time im in, cheers man

tabetha

2007 btw

pee vee

Oh yeah. Lol. Didn't look at that! Lol

jonyb4

lol yea i found this on google by searching 1.8 zetec 4-2-1, and i only seen the date after i posted :P

Focus333

when you said needs a bit of work to make fit, would the st170 flexipipe do the trick? I have 2000 plate 1.8 focus and want to stick one of these on myself.
Thanks

hineho87

i did this on my 1.8 and it made a noticable difference.

The parts you need are:
- st170 manifold
- st170 cat
- st170 flexi
- St170 gaskets
- st170 dipstick tube (Ł10 new from ford)
- ST170 ps pipe (Ł90 new or Ł30 2nd hand)

Only things you need to modify are:
- either bend ur existing power steering pipe at the side of the manifold to the front of ur engine bay (or buy the st170 one)
- replace you dipstick tube (can use you existing dipstick) as it now moves postions to in the middle of the new manifold (or again you can bend it but not worth it for a tenner
- black off the 2nd lambda sensor and move to the neck of the cat as it otherwise it rubs on the drive shaft

Hope this helps, pm me if u need any more info.

Matt

Focus333

Thanks a lot Matt just the info i needed, only difference is im planning to do de-cat until i can afford a sports cat. Not sure how that will effect my engine management light from coming on because it wont be reading a co2 emissions after the CAT.

Do you know roughly how long the ST170 flexpipe is?
As far as i can tell if i put just the ST170 manifold theres only going to be around a 10-12 inch gap between the bottom of the manifold joining to the the rest of the system. I want to either put the ST flexpipe in it if it will fit nicely or weld a peice in until i cant get the rest of the system sorted.

Again thanks and if you have any info that might help with what i just said let me know.
Joe

Focus333

What changes do you need to make for the ST170 inlet manifold to fit? Ive found one with all the injectors and fuel rail and wires, is it just a simple swop over job or is the a lot more tech required?

Thanks
Joe

hineho87

I dont think the st170 inlet manifold fits without modifying it, also when i asked this i was told there was no point fitting it as i wud get no gains. But never tried it to know for sure

hineho87

Tbh m8 you can pick up the std st170 cat which is a sports cat 2nd hand for the same prive you will pay for a decat so in my opinion i wud say it was worth the risk. Also some people who have st170's say they actually have lost power?!?

Not sure on the sizes m8 as now it is all fitted to my car and its not the weather for checking lol. If you fit the cat/decat and then the flexi from the the st170 it will be the rite length to meet you std catback system

Focus333

Ahright yeah i get you, i might just get a 4-2-1 of eBay i found that will fit straight on mine as it is now, decat then get sports cat put in at local gargare.

One thing i did want to ask is whats the deal with people sticking ninja carbs from bikes in? I hear you get great results from it but dont know the risks or how its done etc, anyone got any info on that? Let me know
Ta again for the manifold info, cleared things up for me no end.

phil_focus

the bike throttle bodies route is supposed to be a cheaper route than jenvey but requires more fettling/bodging to fit. you will also need to wire in an aftermaket ecu and loom and have it custom mapped.

hineho87

+1 ^^. Depending wot route you go down it can start getting into the couple of Łks. A lad i know had 210 or 230bhp (cant quite remember) from his 2.0 focus running on ITBs. But the power is mostly at top end so has to be driven harder to get the power. You will also need look at upgrading the brakes as well to something like the st170 set up.

Matt

hogdog

My 1.8 made 120bhp and 126lb/ft on TOTD's very accurate rollers....it had....

An OBX 4-1 manifold and a Milltek cat-back, nothing else.

That's quite a big improvement on the standard figures for those mods.

My standard 2.0 made figures virtually identical to the factory figures on the same rolling road.

Dave Bartley

Dave Bartley