1000hp c5 rs6

[4everRS]

What does the gumpert Apollo use for mafs?

[DHall1]

Ding ding!!

Winner winner

I thought we were just talking about the air temperature?

But regarding cavitation, I still don't think the big problem is the air box, I think it is these 2 silver íntake air duct, just look inside them! I don't know what they where thinking about when they made them?


It is two 4 inch inputs to air box, but in the middle of the silver air duct I think it is somewhere between 1-2inch only?


So of course will airbox implode when you restrict the air flow before it!

So next question is have Apikol and BMC/FMU made new bigger or do they use the OEM ? Because if they use OEM then I think it will put an end long before 1000 hp

[Del Stator]

Yes they use the OEM parts. That is one of the places I have wanted to look at upgrading but not having my car in front of me hasn't made it easy to figure out..

It would be nice to find out how much air cfm can go through Audi's pre-filter intake tubing. I am not sure how that is tested but I have heard people doing flow tests on different intake parts.

I am going to check into it..

[RS8]

It seems that all these ugly kit uses the silver oem intake air ducts?

As a beginning is to try and make new ones but bigger,
I only have modified mine with hot air gun but it was hard to get them bigger because they are molded, so best is to make new bigger in ABS plastic.

[lswing]

It seems that all these ugly kit uses the silver oem intake air ducts?

As a beginning is to try and make new ones but bigger,
I only have modified mine with hot air gun but it was hard to get them bigger because they are molded, so best is to make new bigger in ABS plastic.

Ha, I've always though that. Why make these ugly, if you're going to do some custom work at least make it look good. As you noted, it's really the first intake part that needs the work. I'm sure someone could mold some new ones, or maybe fiberglass/carbon some.

[DHall1]

Oh so simple

Take them out and test in cool conditions. That will tell you if larger ducts are needed.

[Del Stator]

Oh so simple

Take them out and test in cool conditions. That will tell you if larger ducts are needed.

That is a great idea!

It would be an easy test as well on the dyno.

[Del Stator]

Sad that they don't know what they are selling!
BHK is an Audi Q7 3.6L engine? and BHF is Audi S4 V8 US spec.
If they read in Audis spare part catalog then they will see that all Audi RS6 exhaust valve have part number 077109611M and you can't find them in any other Audi V8 engine what I know.
But the intake valve is the same as many other Audi engines.


RS6 head have another casting than S8, because they have a bigger water mantle in the exhaust area that is good for cooling but it can be problem if you want to max out the flowing capacity of your heads and I guess this is the reason that they fit much smaller exhaust valves and seat rings in the RS6 engine.


If you have S8 heads also then I suggest you bring them together with the RS6 head to the guy that will build your heads so he can decide what is best.
If he measures the dimension of the exhaust and intake valves, he will find that it is too small exhaust valves in RS6 engine for it to become a good flow through the engine.
RS6 exhaust valves is only 27mm each (on A8 and S8 they are 30mm)
intake you have 3 valves that is 26,5mm each.



This Ferrera valves you have bought what is the dimensions on them?
I can't find them on Ferrera web site? (I found it on ebay but it says 29.9mm? and on another website it says 30,9mm?)

This is from the Ferrea 2015 catalog.

http://www.ferrea.com/product_images/catalog-file-5.pdf

AUDI 1.8T - DOHC 20 VALVE - 1996-2005
AUDI 2.7T - DOHC 30 VALVE (APB) 1998-2004
AUDI RS6 4.2L - DOHC V8 40 VALVE (BCY) - 2002-2004

Head Stem Overall Tip
Part# Type Diam. Diam. Length Length References
COMPETITION PLUS VALVES
F1554P E 29.9mm 5.96mm 103.92mm 5mm 26º Flo. Stk size. Trip. groove. 2 Valves required
F1555P E 30.9mm 5.96mm 103.92mm 5mm 26º Flo. +1 mm o/s. Trip. groove. 2 Valves required
F1556P I 26.9mm 5.97mm 105.1mm 5mm 24º Sup. Flo. Stk size. Trip. groove. 3 Val. required
F1557P I 27.9mm 5.97mm 105.1mm 5mm 24º Sup. Flo. +1 mm o/s. Trip. groove. 3 Val. required

Stock spec RS6 valves:

Intake: 26.9
Exhaust: 29.9

+1 sizemm o/s

Intake: 27.9
Exhaust: 30.9

Unless Supertech and Ferrea are wrong, I believe the S8 and RS6 valves are the same size..

I have been confused since you said that stock RS6 exhaust valves are 27mm. I cannot find that information anywhere...actually I find the opposite...intake valves are 27.

[4everRS]

In this video, watch closely to the reflection on the air box being pulled in by suction.

http://youtu.be/R4qBs80_0fU

[RS8]

This is from the Ferrea 2015 catalog.

http://www.ferrea.com/product_images/catalog-file-5.pdf

AUDI 1.8T - DOHC 20 VALVE - 1996-2005
AUDI 2.7T - DOHC 30 VALVE (APB) 1998-2004
AUDI RS6 4.2L - DOHC V8 40 VALVE (BCY) - 2002-2004

Head Stem Overall Tip
Part# Type Diam. Diam. Length Length References
COMPETITION PLUS VALVES
F1554P E 29.9mm 5.96mm 103.92mm 5mm 26º Flo. Stk size. Trip. groove. 2 Valves required
F1555P E 30.9mm 5.96mm 103.92mm 5mm 26º Flo. +1 mm o/s. Trip. groove. 2 Valves required
F1556P I 26.9mm 5.97mm 105.1mm 5mm 24º Sup. Flo. Stk size. Trip. groove. 3 Val. required
F1557P I 27.9mm 5.97mm 105.1mm 5mm 24º Sup. Flo. +1 mm o/s. Trip. groove. 3 Val. required

Stock spec RS6 valves:

Intake: 26.9
Exhaust: 29.9

+1 sizemm o/s

Intake: 27.9
Exhaust: 30.9

Unless Supertech and Ferrea are wrong, I believe the S8 and RS6 valves are the same size..

I have been confused since you said that stock RS6 exhaust valves are 27mm. I cannot find that information anywhere...actually I find the opposite...intake valves are 27.

That info is correct for A8/S8 and 1.8t/2.7T and not for RS6 !

Why don't you just measure on your RS6 head?

And read this information about RS6:

[RS8]

And here you have my A8 head with A8, RS6 and Supertech valves that I have measured!

[RS8]

I did the exhaust valves on the RS6 are the same diameter as the exhaust valves on the S8. Have you actually measured or even seen these valves in person or are you going off off product literature that is often incorrect?

But did you have 30mm exhaust valves on RS6 and S8 head?

Is the RS6 head from BCY engine?

What engine code is it on the heads you have?

[scottmandu]

Head Stem Overall Tip
Part# Type Diam. Diam. Length Length References
COMPETITION PLUS VALVES
F1554P E 29.9mm 5.96mm 103.92mm 5mm 26º Flo. Stk size. Trip. groove. 2 Valves required
F1555P E 30.9mm 5.96mm 103.92mm 5mm 26º Flo. +1 mm o/s. Trip. groove. 2 Valves required
F1556P I 26.9mm 5.97mm 105.1mm 5mm 24º Sup. Flo. Stk size. Trip. groove. 3 Val. required
F1557P I 27.9mm 5.97mm 105.1mm 5mm 24º Sup. Flo. +1 mm o/s. Trip. groove. 3 Val. required

The lengths are incorrect for the V8 engines. I deleted my last post as I was incorrect.

[Del Stator]

But did you have 30mm exhaust valves on RS6 and S8 head?

Is the RS6 head from BCY engine?

What engine code is it on the heads you have?

I don't have my car with me.

The engine is the original engine from a US spec 2003 RS6.

I don't know what information is correct pertaining to other engines. And I don't have my heads in hand. I am going to talk to Ferrea and get the biggest valves available for my RS6 heads. There certainly is lots of uncertainly about this subject...

[RS8]

The lengths are incorrect for the V8 engines. I deleted my last post as I was incorrect.

Okey, So you haven't measured the valves on RS6 and S8 head as you said you have?

(But as I have done and showed in the post above)

[RS8]

I don't have my car with me.

The engine is the original engine from a US spec 2003 RS6.

I don't know what information is correct pertaining to other engines. And I don't have my heads in hand. I am going to talk to Ferrea and get the biggest valves available for my RS6 heads. There certainly is lots of uncertainly about this subject...

But didn't you say that you where going to ship your heads this week? or have you already done it? (you have engine code in the front of one head where the lifting eye is)
If you have shipped them away already, then let your head guy Lee Schwartz measure them before you talk to Ferrea again.

[Del Stator]

Yes the holidays has slowed down everything. The heads are not even off of my RS6 engine yet.

If the valves we have bought are actually for a S8 then that works for me. I will keep my engine intact and find some S8 heads.

I am sorry but I am totally confused at this moment.... :/

I am not going to post anymore about this until I totally understand what is going on. I can't continue to relay second hand information.....

[RS8]

Yes the holidays has slowed down everything. The heads are not even off of my RS6 engine yet.

If the valves we have bought are actually for a S8 then that works for me. I will keep my engine intact and find some S8 heads.

I am sorry but I am totally confused at this moment.... :/

I am not going to post anymore about this until I totally understand what is going on. I can't continue to relay second hand information.....

Okay so you have a working RS6 car and you have S8 cylinder block but not the S8 heads?

All the information that I have written about valves is what I have measured up and not something I heard from someone else ..