[s-cars] camshaft

[Mike Sylvester]

I'm just curious what we've lost and gained by having the cam in this
position.
If it were a net gain to have it there, then wouldn't it be an upgrade
for RS2 owners to turn their intake cam to the AAN position?

Someone must know what the tradeoff is when advancing or retarding the
intake cam.

Mike

www.urq20v.com

> -------- Original Message --------
> Subject: Re: [s-cars] camshaft
> From: David Forgie <forgied at shaw.ca>
> Date: Mon, April 04, 2011 8:33 pm
> To: Steve Mills <s.b.mills at gmail.com>
> Cc: Mike Sylvester <mike at urq20v.com>, s-car-list
> <s-car-list at audifans.com>
> 
> 
> Steve:  I am not sure when I became aware of this issue. Certainly it was before I installed my RS2
> exhaust cam on my otherwise fully RS2'd AAN.  However,  since installing the cam is no biggy, I 
> thought I would try it with the AAN exhaust cam sprocket and see how it works.  The answer is, it
>  "works".  How well, is debatable. My butt dyno isn't calibrated that well so a real back to back 
> dyno test would be needed.  And then another test with the proper RS2 exhaust cam sprocket and
>  cam sensor shutter (shield, whatever). 
> 
> I think my bigger concern related to the chip set I am running with my RS2'd goodies and whether the RS2 shutter put the cam sensor window back in the OE AAN spot or whether it was turned
> 10 degrees.  (I presume the RS2 window is adjusted back to the OE AAN/ABY trigger point).
> 
> One thing that was in the back of my aging mind was in the very old days, I ran an adjustable cam
> sprocket on a VW 1.6 water cooled (1980 Jetta) (headers, big valve head, G grind cam, Weber 
> big throat, etc).  Moving the cam one way or the other lead to compromises (if you gained on
> the top end, you lost on the bottom end, and vice versa).  Of course, the car companies figured this
> out and now even the Toyota Yaris 1.5L engine has 16V and variable cam geometry.
> 
> For now I am happy with the RS2 exhaust cam installed as an AAN cam.  I haven't gone through
>  "Air Care" with it yet (this June I think, every 2 years) so we'll see.
> 
> Dave F. 
> 
> ----- Original Message -----
> From: Steve Mills <s.b.mills at gmail.com>
> Date: Monday, April 4, 2011 5:11 pm
> Subject: Re: [s-cars] camshaft
> To: Mike Sylvester <mike at urq20v.com>
> Cc: David Forgie <forgied at shaw.ca>, s-car-list <s-car-list at audifans.com>
> 
> > I think the point of my post was that people didn't realize that 
> > they were
> > installing it 10 degrees off by reusing the AAN parts. I've been 
> > on these
> > lists many years, and I've never seen it mentioned before.
> > 
> > Steve
> > 
> > On Mon, Apr 4, 2011 at 7:35 AM, Mike Sylvester 
> > <mike at urq20v.com> wrote:
> > 
> > > It is just surprising to me that if you buy everything to go 
> > full RS2,
> > > including the exhaust cam and then leave the intake cam 
> > installed 10deg
> > > off.
> > > What effect is that going to have on the performance?
> > >
> > > Mike
> > >
> > > www.urq20v.com