Throttle response I guess. I have heard that a ST Escos plenum will flow just fine. I want one of these cos they look cool!

 

The manufacturers should be able to answer this as they will have done the tests And it isn't throttle response..

 

LOL

 

b9kos runs one with no issues on a standard head

 

was live mapped though.....

id of thought the problem must air flow related, like no 4 geting more air than no 1? this problem maybe amplified by small ports?

 

aye mine will be live mapped to so i aint panicing lol

 

mine to on the new engine!

 

will the size not give you shit loads more lag?

 

sweede inlet is a FOOOOOOOOOOOKIN pain to make to fit properly with throttlecable and hose for intercooler..

 

i didnt notice any lag increase fitting one....i did however cure my surge issue

 

hows the build goin chap?

 

well, its a time issue at the mo,

but i have a few major components, like turbo etc etc, just the engine bits i need to get, but cant till ive had the bore inspected to see id i can stay .5 or not. if not its being linered back to standard.

than its off to martin for longstudding....

 

The plenum is tappered to create equal air flow into each cylinder. The problem with a straight shape is that air has a momentum as it enters the plenum and this will tend to mean it bypasses the first cylinder and favours the later cylinders.

The tapering of the plenum creates a higher pressure area at the far end when compared to the TB end. The higher pressure discourages some of the air from rushing to the end and the lower pressure area slows it down enough to enter the closer cylinders.

 

i can only speak from my personal experience with these plenums, and i had a major air flow issue with mine before stu revised my chip, cylinder 1 was very rich, but cylinder 4 was dangerously weak....it cost me an engine as it melted no 4 piston.

its hard to spot as a wideband gives an average, which was fine,

 

heres the plugs from the engine that died



stu manahed to sort this issue, by playing with the fuelling, but.....there must be an air flow issue for it to need playing with.... the standard one never gave these issues for me.

 

Seeing as the original Swedish plenum is tapered then the cheaper copies should be too if the product is to be sold as a Swedish copy plenum. I buy my Swedish plenums from Sweden as I don't like copies. My original comment was based on a tapered version.

 

nice mate

you going central day ?

 

this is why my new engine is having one from mr rainbird!

 

ill be monitoring egts and will dial in more fuel to a weaker cylinder

 

not sure if the car will be, but im sure i will be there somehow, we must catch up for a chat!

 

thats the best answer, and what stu wanted to do...

 

we have a stand mate pop over

 

I don't recommend these types of inlet for two major reasons.

1. Un-uniform air flow to each cylinder

2. Lazy throttle response.

Whilst many will argue one version is better than another, I have tested virtually all types on the market today and none flow uniformly. Some show EGT spreads as wide as 200DegC on full boost which can spell disaster when the engine is mapped on average AFR/EGT alone.

I now advise that all cars being mapped with this stlye plenum should have individual EGT monitoring.

Lastly remember that turbo charged cars running a single throttle body should have a plenum design that allows air to enter in as uniformly central position as possible, otherwise the effect of forced air velocity will have a substantial impact on individual cylinder air flow.

 

still like liking the idea of chopping my intercooler andf re welding, i just bought new boost hoses for the bloody thing aswell and then this come up lol

 

What about the Rainbird ones, Im sure I was told somewhere his flow really well??

I could be wrong but Im sure his were mentioned as being good.

 

I've refrained from mentioning whose are worse than others, but I would NEVER fit one to any engine of mine. None flow uniformly enough to justify using one.

If you require a plenum to flow 500bhp use an EEC4 item, otherwise use a genuine RS500 item for power beyond 500bhp. (You can add a small spacer to the 500 plenum for extra flow if required without upsetting individual cylinder flow, should your aim be 600bhp+.)

There are other manifolds out there that flow well but are considerably more expensive than those mentioned above.

 

whats a eec4 item

 

Small turbo item ... No need to go mad on the plenum sizes, spec to what you need and nothing more.

 

will do you think i may need one? or should a standard 2wd plenum with a spacer do?

 

As far as I am aware a 4x4 manifold with a spacer should do 500ish,but again I cannot say for sure, more of a question for the pro's ... Or cut and weld the 2wd items like jenspeed

 

il ask Stu or someone alike

 

All I want is 420 ish out of mine max. Playful but not silly

 

there are several cars runing these maifolds with no issues , as long as the cars is setup right then itll be fine

 

Hmmm, well having had 2 of the most respected cos tuners say don't use one I think I won't use one!! Even though it looks good its not worth melting pistons etc to look good.

 

well to my knowledge stu sets them up fine did a really nice job on b8kos's car, i also ordered a off the shelf chip for a car with a gt30 and a swedish which the turbo alone isnt the easiest thing to do on a shelf chip and thts still in one piece

 

I'm not knocking anyone that uses them - I'd quite like one myself. But I can't afford to risk a rebuild again. I don't really need one for my power level (I'm nowhere near needing a GT30 yet ) so I'll stick with the stock item for now.

 

As taken from the R&B website:

"This manifold removes the restrictive elbow, and due to it's unique design, it has been flow tested and at 2 bar of boost there is only a 2% disparity accross the cylinders. This is considerably better than the OE manifold."

Proof that a tapered swedish plenum can work well.

Mikes tapered swedish plenum design has been run on successfully on many big power cars.

 

It has been flow-bench tested as well as on the engine dyno with individual EGT probes per cylinder.

This manifold is on AndyG's Focus and numerous other big power cars without issue.

 

And there is your answer .... Flow bench tested, not made in someones back garden .

Mike, does this provide any useful gains anywhere over an EEC IV plenum up to 550ish bHP? and would it be useful on a 400BHP engine?

 

nah not buying that as a weally weally big tuner says no cheers mike for ur reply