http://cgi.ebay.co.uk/ws/eBayISAPI.d...546917168&rd=1

Anyone have any test figures for these???

 

Minor overlaps may be present, this is due to the fact Cosworth plenums are of cast construction, cast construction by it's very nature is not as accurate as a machined part , meaning each plenum will vary to some extent making it impossible to make a generic exact match spacer plate.

(Photos/images for illustrative purposes only. Product's appearance/function may differ slightly. All dimensions are approximate and may vary +/- 0.1mm

 

Is that you then Matt???

Do you have any test figures???

 

No mate...was just reading the smallprint

 

dont rod have one on his car

 

Yeah read that....Very small print though....

 

cosrush - you might find that the throttle body is moved out and caches on the 'lump' in the engine bay on the rush.

is the problem with the 2wd plenum not in the elbow anyway rather than the plenum capacity

 

It is my understanding that it is indeed the elbow that causes the restiction between the throttle housing and the plenum.

Just saw them on Ebay, and remember seeing one a while ago, and wondered whether they make much of a difference...

Im not about to get one for mine....

A friend of mine has a Phenolic spacer on the inlet to the head, and the reduction in transfer of heatsoak from the head to the plenum is greatly reduced, such that it doesn't cause heating of the air around the ACT sensor fooling the ECU to thinking its hotter than it is.... His tests showed a good result after boosting against running without one...

 

Yep !! & with RS500 plenum will flow 700bhp.

 

as you've said the restriection is the elbow.

Your just avoiding the issue by adding a spacer to flow more air.

Obviously 500 inlets done have this restriction

 

Ryan,

Never seen an RS500 inlet...how are they different out of interest???

 

...nor does the EEC4 plenum/elbow to 550bhp..which to be fair is more than enuff bhp!

So in short buy a EEC4 plenum cover instead!

 

I can put some pics up if you want -

 

its quite a bit different a very noticiable. What some piccy's up Doug.

Oh and good to meet you last night.

 

Good to meet you too Ryan

 

Nice pix...

Thanks for that

So back to the plenum spacers.....

I can see how they increase the volume within the plenum, but how does that help when the volume in the throttle elbow remains the same....???

Any idea's???

 

Let the clever buggars worry about that. it made more Power on the Dyno thats all i know. Mark had test results on this a few years back & many of his cars have run the spacer.
Rod

 

it will only help when the volume in the chamber is a restiction, on a 2wd manifold the restriction is the elbow not the spacer so its pointless.

 

What spec engine is yours Rod???

 

PLEASE BARE IN MID THIS...

IF the spacer works and gives more BHP you may well require a re map to stop detting your YB to destruction!!!!

Leave well alone any BHP increasing mods that aint taking into account in your chip.

Feel free to aint gimmicks that make no difference whatsoever except make you "feel" your getting more bhp cause the maker says so

 

Shame somebody cant fit and test to show results....

Like i said, im only asking to try and understand what is happening, as i realise the volume of the plenum is increased but the volume through the elbow isn't therefore there should be no increase in airflow....

and its not something im considering doing....

 

..i say this Cosworth know what they are doin..you want the best go RS500 plenum.....

Or go swedish plenum like me for 700plus proven

 

I would have one of them swedish plenums if i had any money....
and also a live map,new ECU with Closed Loop Boost control and fuel control, Greys,fully ported head etc etc....



Anyone know the winning lottery numbers

 

Saw darrens car at stonleigh and the sweedish style makes that side of the car so much neater and easier to work round. Worth it in a 7 even if it doesn't increase power. Needless to say Ive got the dax bodge as I can't afford one either

 

Engine Specification

2150 c.c. DOHC 4 cylinder 16 V : Nikel linered block: 7.2:1 pistons : custom con-rods : custom crank: Group'A' Big-end bolts : Double length head studs : High pressure oil pump : Baffled sump: Gas flowed & ported head : Uprated valve springs : Bronze valve guides : WRC Head gasket :
M.A Development profile cams : 4 x 1000cc injectors : Autronics ECU/CDI : 4 coil ignition :Swirl Pot: Automotive fuel pump: Spaced RS500-Throttle body :
GT40 Turbo-charger : External wastegate : SPEC-R Turbo Pre-Radiator : Turbosmart boost controller: SPEC-R Group ‘ A’ Dump valve : Induction kit : RS500 Intercooler : Large Capacity Radiator : SPEC-R High Pressure Header Tank : Samco Hoses : SPEC-R Group ‘A’ Breather System :
Tubular exhaust manifold: 3 1/2" BTB Stainless Steel Exhaust : Mapped Water Injection : Oil-Cooler : 15v accuvolt system :


Nitrous

Highpower Direct-port system: Powermax Progressive controller : Purge valve:

 

Holy Cr@p.....

Far from standard then....

Nice spec ...do you know how much Power/torque you're making???

 

also the plenum spacers is not to get more volume as such its more to do with the ram pipes being close to the back on the plenum opening the gap up incresce flow

 

Brom,

Funny you say that...

I was thinking about that last night, the airflow into the plenum through the elbow fills the plenum in and around the Trumpets.
The airflow has to flow into the trumpets and thus into the engine.

So by adding the plenum spacer, you are increasing the volume directly in front of the trumpet, so therefore surely that should allow for more airflow to flow into the engine purely as there is more space for the air to move in...

Any thoughts....???

 

You've not been on here lately have you

 

No..couldn't get connected

 

Rod made over 200mph with that engine (may have been a different turbo, the GT40 might be his new one, I've lost track )

 

awesome....

 

Rod does a standard valved head flow 700bhp though ?

 

Steve - do you not think that the list may not be complete? i.e. typed of the top of Rods head I don't think cosrush was looking for a spec so he do a spot on copy build .

 

Usually ROD is BIG Headed about everything so thought he might post

Touring Car Big Valve Head

 

On gt35 made 614bhp/508ft-lb @ 2.2bar on Pump Fuel more on race. Mapped for 2.5bar on road so circa 630/520 ish. New Turbo figures as yet unknown but 650+ on pump & 700ish on Race & 800+ on Nitrous are the targets.

 

But it must be hard to remember all the blings parts when everything is bling

 

As you say my head is big. Mine will not go on the Dyno, but Ranjs will so that will tell you if 700 is achieved. No figures will be published but im sure a 700 or not statement will be given.
Rod

 

Jealousy is a grim trait dont you think chaps?

 

Deffo with you on that one Stu!
Some people need to grow-up