Renich Carbon fibre Ram Air Duct

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Accelerated air == fast air.
fast air == lower pressure.
lower pressure == lower density.
lower density == less bang.

The whole point of the airbox is to provide the engine with a nice calm reservoir of fresh air that ideally isn't moving at all. With the RS4 the external airbox is only a small part of the equation - just look at the intake manifold (page 21 of the study guide http://www.s4-mtm.com/images/RS4V8-StudyGuide.pdf) as this shows that each cylinder has it's own intake trumpet drawing off a large air volume inside the manifold nestled between the "V" of the engine.

I find oil temp when on the motorway is 90% down to the age and quality of the oil. As a synthetic oil gets older it gets thinner as the polymer chains get smashed by the pistons. thinner oil will run much hotter. My last oil change when I got rid of the "longlife" oil from previous owner saw me running at about 98-99c on the motorway. The same day after changing it to fixed serving and fresh oil saw it sitting at 89. In fact it's even more profound than that as the earlier reading was first thing about 7am and the second reading about 2pm so ambient was much higher.

Whilst on the dyno it would be good to see some vag-com logs.

[Jules]

Sorry i am not mechanical at all
But would a really dirty standard air filter even lose a few bhp ?

[RTS BRAT]

I'm still interested in pics and details on the race spec. aux. rad. single for double replacement if you could oblige RTS BRAT?

[P_G]

Top man, so is the rad from Renich as well?

[RTS BRAT]

Yes, but made by PWR.

[RTS BRAT]

Where do we find details of this kit???

I think there are loads of people here who want to know. As a GruppeM owner I know I do, I am under no illusions as to how much power we lose with heat soak

Any details yet?

EDIT: I am not phased about the cooler just the carbon CAF

I'll try and contact Patrick, but you should be able to email them... I tried the address and got a response info@renichms.com

[P_G]

Even better still (and a bit cheeky), get Patrick to register on here and provide details of pricing or a Group Buy on the rad. and RAI, saves you being the middle man!

[thedoluk]

Emailed Renich again and go this reply

Hi Daniel,

Thank you for contacting us.

When the kits are released publically, our company will provide two types
of duct. The combination of our Radiator and the Ram air duct ensures that
both engine oil and combustion temperatures are kept as cool as possible.

Race Kit: £1216.91 + VAT
Standard Kit: £1106.28 + VAT

Details:
"Race" created to ensure that the benefits claimed by existing aftermarket
Induction kits are achieved and in some cases enhanced.

"Standard" created to fit the Audi OE Air box and increase HP.

The ducts have been designed to ensure that cold air is sent directly to
the Air box from the OE fog light duct, located in the front grille. All
air which makes it pass the side Bumper vents is forced through the duct
and into the air box. Both ducts "Race & Standard" mount directly into the
auxiliary radiator mounting bracket.

Secondary radiator:
The Radiator is specifically designed for Renich and is a direct
replacement for the OE unit. Our radiator has been developed with a
company that supplies Various DTM Race and Rally teams around the globe,
in addition to a very successful Formula 1 race team.


Best regards
Patrick

[P_G]

Is it me or is that quite pricey?

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Nearly 1500 quid?!?

For a radiator and a piece of tubing with a plastic funnel? Well designed it may be but... It's a radiator.

I have no problem with upgrading the fragile stock aux radiator but you could get 3 or 4 stock ones for this including fitting. I'd like to see some evidence to show that the stock system is stretched as given others have run extended track and 'ring sessions with no temperature issues I'd wager not.

[P_G]

Plastic ads; its carbon fibre I'll have you know . I suspect the CF RAI is the bulk of the cost. I may just ask about the race spec rad in the meantime unless a GB is on the cards.

[ArthurPE]

I agree to an extent, you want a nice constant pressure in the plenum, that is why air is relieved into the fender
no stalling of flow or surging/pulsing of the volume

faster air does provide more pressure, vel = sqrt(DP) or DP = vel^2, or the higher the vel the higher the pressure...
if you squeeze air in a venturi it speeds up and the vel press increases (they are used to amplify signal strength for measurement)
press has 2 components, velocity and static

Accelerated air == fast air.
fast air == lower pressure.
lower pressure == lower density.
lower density == less bang.

The whole point of the airbox is to provide the engine with a nice calm reservoir of fresh air that ideally isn't moving at all. With the RS4 the external airbox is only a small part of the equation - just look at the intake manifold (page 21 of the study guide http://www.s4-mtm.com/images/RS4V8-StudyGuide.pdf) as this shows that each cylinder has it's own intake trumpet drawing off a large air volume inside the manifold nestled between the "V" of the engine.

I find oil temp when on the motorway is 90% down to the age and quality of the oil. As a synthetic oil gets older it gets thinner as the polymer chains get smashed by the pistons. thinner oil will run much hotter. My last oil change when I got rid of the "longlife" oil from previous owner saw me running at about 98-99c on the motorway. The same day after changing it to fixed serving and fresh oil saw it sitting at 89. In fact it's even more profound than that as the earlier reading was first thing about 7am and the second reading about 2pm so ambient was much higher.

Whilst on the dyno it would be good to see some vag-com logs.

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Conservation of mechanical energy says as speed increases and therefore the kinetic energy then it's dynamic pressure must drop.
If faster air resulted in higher pressure then please explain how aircraft fly.

[Rick_RS4]

<beep> the bed thats overpriced, you could have an aux rad custom made for no way near that, the duct ok its CF but who cares only, who is going to get on the floor and look inside your foglight grill ?

ok mine doesne look as good but it cost a tenner for the resin and fiberglass, so thats £1490 for a radiator.

if anyone is thinking of buying this you have more money than sense

[sonny]

Rick, why dont you make one up?