Schrick Cam installation

Tue May 4 12:46:05 EDT 2004

I thought the sensor on the bell housing was a TDC sensor. I also assumed that the ECU could only vary timing around a base setting, factory established at 13BTDC. But it may be more sophisticated, and actually use the combination of dizzy hall sensor and TDC sensor to know and adjust exactly what the timing is. In this case, manually adjusting the timing would have no effect until you move far enough that the ECU can no longer pull it back.
Hmm....
Steve

> 
> From: Alan Pritchard <apritchard at seaeye.com>
> Date: 2004/05/04 Tue AM 09:41:11 EDT
> To: 'David' <duandcc_forums at cox.net>
> CC: "Quattro List (E-mail)" <quattro at audifans.com>
> Subject: RE: Schrick Cam installation
> 
> Mine just has a nut holding the dizzy in position. Rotating the dizzy
> definitely alters the timing in some way, I put the fuse in the fuel pump
> (actually I have a jumper switch wired in) and altered the timing like that,
> although I don't know what happens when you un-jumper again. When set to 22
> btdc the car ran awful, so something definitely had changed, 16 and 18 felt
> the same, so I opted to leave it at 18.... I don't know how the ecu can tell
> that the timing has been messed with, afaik the only sensor it has is the
> hall sensor on the dizzy, although saying that there is something on the
> bellhousing which im not quite sure what it is. I would be interested to
> find out mor though.
> 
> Best Regards,
> Alan Pritchard
> 
> Network Administrator
> Mechanical Design Engineer
> Seaeye Marine Ltd.
> +44 (0)1329 289000
> 
>  -----Original Message-----
> From: 	David [mailto:duandcc_forums at cox.net] 
> Sent:	04 May 2004 14:32
> To:	Alan Pritchard; Quattro List "E-mail"
> Subject:	Re: Schrick Cam installation
> 
> Your NG has adjustable timing? It should be locked in by the factory (some
> sort of little anti-tamper tab on the dizzy to keep you from messing with
> it). Mine still has it. Anyway, my understanding is that adjusting the
> timing n a CIS-e III car is a bit more complicated. You have to do something
> to keep the ECU from fooling with the timing for you. Since I've never taken
> the locking tab off mine, I can't tell you exactly how to do it. I'm sure
> someone here can. Another thought. If you aren't pinging on regular, you can
> dial up the timing quite a bit more if you run premium. You'll get a bunch
> more power...
> 
> Dave
> 87.5 CGT
> SE Virginia, USA
> ============================================================
> From: Alan Pritchard <apritchard at seaeye.com>
> Date: 2004/05/04 Tue AM 06:30:30 EDT
> To: "Quattro List (E-mail)" <quattro at audifans.com>
> Subject: Schrick Cam installation
> 
> Ok, Installed my schrick 272 at the weekend. Took 2 hours with the right
> tools on my 1990 90q. I tried loosening the manifold (ng manifold) bolts,
> and cam shaft sprocket bolt by hand, to no avail, borrowed a 180nm 12v
> impact wrench (£15 ebay) from a friend and it did the job perfectly.  I
> could not find any tdc marks on the front of the engine, so wound the engine
> to tdc on the flywheel,  put a paint mark on the dizzy-rotor arm, and one on
> the cam belt-cam shaft sprocket. Disassembled and reassembled to these
> marks. Started the car no problem, adjusted the timing to a smooth idle,
> which was far too advanced, about 22 degrees btdc. Went back to 16 which it
> was before. Idle was very lumpy, took it up to 18 btdc and drove it, no
> knocking on standard unleaded (according to the fault codes anyway).  It
> drives differently to how id imagined it, I expected to feel a surge of
> power at 4000-4500 or there abouts. Instead in low gears it feels exactly as
> before, until 5250, when accelerating it just keeps going at the same pace
> until the rev cut!!! In higher gears accelerating from low speeds (ie 20mph
> in 5th) is a bit painful. But generally I am very happy with the way it
> performs.
> So, a few questions....
> Should I adjust my idle mixture?
> Where are my timing marks??? There should be one on the cam sprocket, and
> one on the harmonic dampener, but I cant find them!!!
> 
> Best Regards,
> Alan Pritchard
> 
> Network Administrator
> Mechanical Design Engineer
> Seaeye Marine Ltd.
> +44 (0)1329 289000
> 
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