RS6 BUH camshaft

[PetherAlex]

Does anyone know if I can put the R8 or Lmaborghini camshafts on the RS6 BUH, in order to have higher rpm's

[welwynnick]

Not a great idea. Turbo engines don't usually like long overlap camshafts because of the pressurised inlet and exhaust. S4Player's car has a good TTE1000 tune that generates max power at 6900 rpm, and max torque at 5700, so that's pretty high. The turbo tuning and supporting mods such as inlets, exhausts and charge coolers have a large bearing on high rev ability.

Nick

[IanH755]

Camshaft profiles for NA and Turbo engines generally tend to be different enough that you normally wouldn't swap NA Cams into a Turbo'd car (or the reverse). I don't know what Cams the Twin Turbo'd V10 R8's use - whether it's a custom one or just reuses the NA ones.

Physically I'm not even sure if they'd be a direct fit either.

[welwynnick]

There is a lot of commonality between the two engines, but I think the camshaft drive sprockets have a different number of teeth, depending on the year of the Lambo engine.

Nick

[PetherAlex]

i wish i could go up to 8000rpm, i believe a good camshaft profile would allow this, I know the camshafts are variable, maybe electronically I can raise the maximum power peak to higher rpm

[PetherAlex]

Camshaft profiles for NA and Turbo engines generally tend to be different enough that you normally wouldn't swap NA Cams into a Turbo'd car (or the reverse). I don't know what Cams the Twin Turbo'd V10 R8's use - whether it's a custom one or just reuses the NA ones.

Physically I'm not even sure if they'd be a direct fit either.

I researched a lot on the internet, I didn't find information about camshaft of the R8 and gallardo turbo

[PetherAlex]

i found this website https://www.maxrpm.de/Schrick-camshafts-for-Lamborghini

[welwynnick]

Interesting, but they seem to suggest that the 5.0 and 5.2 camshafts are interchangeable. That is definitely not the case due to the different bore spacing.

Nick

[IanH755]

i wish i could go up to 8000rpm

I'm running 7500rpm on OEM Cams with peak power hitting around 6500rpm so I'm not sure "only" raising the RPM limit would achieve what you're after. To move that Peak Power RPM it's more about the ability of the turbo's to still be able to produce the required boost at higher RPM's rather than just moving the RPM limit, as the higher the RPM's go the more air the engine is demanding from the turbos, so unless those turbo's can supply that increased air demand nothing will change except the rev limit.

Plus the higher you go the more issues you get into such as the Valve springs may start to suffer from Valve bounce etc which might be worth looking into (I had to change mine on my 8500rpm Nissan R34 engine).

[PetherAlex]

i wish i could go up to 8000rpm

I'm running 7500rpm on OEM Cams with peak power hitting around 6500rpm so I'm not sure "only" raising the RPM limit would achieve what you're after. To move that Peak Power RPM it's more about the ability of the turbo's to still be able to produce the required boost at higher RPM's rather than just moving the RPM limit, as the higher the RPM's go the more air the engine is demanding from the turbos, so unless those turbo's can supply that increased air demand nothing will change except the rev limit.

Plus the higher you go the more issues you get into such as the Valve springs may start to suffer from Valve bounce etc which might be worth looking into (I had to change mine on my 8500rpm Nissan R34 engine).

I don't remember where I read that the springs on the S6 V10 are more and can be used on the RS6
Have you made any drastic changes to your engine?

[welwynnick]

There are two commonly used springs used on a VERY wide range of larger VAG engines,
A softer one, 06F 109 623, for regular models, and a harder one, 06E 109 623, generally for high tune models.
The same spring is used for inlet and exhaust valves.
For some reason the better spring is used on the S6 & S8, and the softer spring is used on the RS6 V10.
I think it would make one of the obvious upgrades if you want to rev higher and/or use more boost (both need uprated valve springs).
There are various aftermarket springs as well.

Nick

[welwynnick]

i wish i could go up to 8000rpm, i believe a good camshaft profile would allow this, I know the camshafts are variable, maybe electronically I can raise the maximum power peak to higher rpm

There are several VAG 90 degree V engines which rev that high reliably, but they use forged pistons and rods for that.

[IanH755]

Have you made any drastic changes to your engine?

Nothing internal is changed. I was quite surprised MRC got 7500rpm without the power dropping off a cliff, especially as the OEM limit is 6500rpm.

[welwynnick]

I can't help pondering the over-engineering of the RS6. The stock internals withstand an additional one bar boost and an additional 1000 rpm, which is a big deal.

If they had simply turbocharged the cheaper, lighter, shorter, wet sump, direct injection, 4.2 FSI V8 they could probably have achieved similar results with just 10psi boost.

But then, we probably wouldn't be talking about it now, would we?

Nick

[VaudiGR]

I can't help pondering the over-engineering of the RS6. The stock internals withstand an additional one bar boost and an additional 1000 rpm, which is a big deal.

If they had simply turbocharged the cheaper, lighter, shorter, wet sump, direct injection, 4.2 FSI V8 they could probably have achieved similar results with just 10psi boost.

But then, we probably wouldn't be talking about it now, would we?

Nick

Have you got experience with v8fsi rs4 owners who compressorised their v8 about the engine longevity, the amount of timing it can sustain at such high compression and how soon the cylinder. Heads eventually give way and need rebuild?
I bet audi read through those lines to go the way they did. There is always of course the battle with other makes about who makes the better car, but overall, the v10 and the way it is engineered I suppose allows for more than enough power. In my little experience so far the let down is the gearbox and not the engine.
If the car had the C7 gearbox instead of the C6 it would have been a completely different animal