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2 litre tuning - which induction?!


Weeksy
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Hi dudes,

 

I have dumped a 2 litre silver top mondy lump into my mk6 estate, and for a while smoked it around with a 4 branch and decat, a stainless system and a K+N panel filter, trying hard to resist any further mods...Until I had a chat with Ken Newman..

 

Now I have a nicely fettled CTM head fitted , along with a pair of ph3 Newman cams (270 degrees and 10.79mm lift) and their verniers.

 

Now I am looking to get it all set up, and am at a bit of a crossroads with regards what to do with the induction. It runs all the factory 2 litre stuff at present. I would prefer to stick with the std set up as long I am not losing 25 odd bhp, as it's my daily driver, and I have a Cossie for silly days. A unichip was therefore my first thought, with the option of running it without the MAF sensor as they can run off the TPS only. I believe that the injectors won't go above 165 bhp at their limit, but am not sure...Or do I go bike carbs andstand alone and run a nice big airbox to keep it all quiet?

 

What are you thoughts please fellas?

 

Any input would be much appreciated

 

Weeksy

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What is a 'fettled head'? Is it ported, or just polished? Does it have uprated valve springs?

 

A cam change is the last thing i'd do to a Zetec to be honest as the standard ones are fine for 170bhp. Putting anything hotter in will negatively impact your torque curve.

 

The constraint is the inlet tract, so yes you will need to change to carbs or throttle bodies. Plenty of choice out there. I'd go EFI over carbs anyday, but it is more expensive.

 

Even if you do go for ITB's, you've still got a mis-matched spec. If the head IS ported and with the wild cams, you've got a head probably good for over 200bhp but the internals of the engine and the compression ratio are only good for say the 170bhp above. If you don't intend to change the internals then a standard head and cams will perform better overall than what your modified one. You'll end up with a sharper engine and a wider power band.

Edited by Stu
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Hi stu, ported polished, with a little skim, and fitted with newmans springs along with the aforementioned cams.

 

I changed these as although the STD ones appear to be great for turbocharging, the duration due to it being a good emission engine seem to be pretty mild and with all the induction opened up, a bit of a restriction.

 

With the induction sorted, I am hoping something in the late 100's, and fitted arp big end bolts just to be on the safe side!

I am thinking of going r1 throttle bodies on a custom inlet, but

have definitely decided on an emerald ecu after speaking to dave

walker in great depths about my spec.

 

These cams are not wild stu, and the car has an almost factory idle with very little loss of low down pull. I hope to have this even better with it all mapped! Who knows!

I could change pistons, but decided to draw the line at going too mad with the bottom end, the bolts should let it spin to nearish 8k shouldn't they?

 

If so, and the beast can breathe a little, I will be more than happy!

 

Thanks for your post my good man

 

weeksy

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Yes dude, it's a 2 litre mondy one and is a tight fit owing to the shape of the manifold sweeping to the opposite side the escort one does, and the recess in the brake bar!

 

That's an interesting twist to it then fella! How does yours run?

 

Difficult for me now, as I reckon I would get more on throttles, bu the car will easily swallow another grand in doing so.

 

Need to have a think!

 

Thanks for coming back dude

 

weeksy

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I trial fitted a mondeo inlet manifold and a focus one, and they looked to tight to the brake bar for my liking. Gti one seems fine. The outlet one though, dunno if it was the placebo effect but it seemed restrictive, 4-2-1 and it seemed much happier. what outlet you running?

 

Mine runs spot on now, it was tweaked by pumabuild and the mechanic there was very good! it was abused by J T Motors and Hightech motor sport who could not getting it running smooth (ish) or to idle! I think it takes great skill to time up cams properly set the followers etc

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It is close I will grant you that, but I have not had any issues at all - yet!!

 

I run an Ashley 4-2-1 with a flexi sectioon to stop it all pulling itself apart (the system didn't have a flexi), coupled to a Magnex system with a custom made back end that doesn't knock or tap at all!!

 

Just takes time my good man - mine runs really nicely, with only the slightest wobble from a factory smooth idle, love it.

 

I now have some R1 throttle bodies now, so there is progress!

 

Thanks dude

 

Weeksy

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