Hey guys i was cleaning up my around my dizzy cap, and for the first time noticed it has the slots way in the back so that you can turn the dizzy on the shaft to adjust . Now i know the timing is set via the computer, so is this adjustment to get the spark timing in sync with the injectors? or to sync the front and rear cams? is there any gains to be made by tweaking here (like you can do on older cars) or will it just throw it out of whack in relation to injector pulse?? i thought the dizzy was set and the ECU controlled spark timing as well. reason i ask as i know on my old trooper i was able to smooth out the idle by advancing the timing 1-2 degrees and we all know the issues we have on our cars with that!! cheers.

Rob,
IMHO would be best left alone. The EFI and ECU brings your car into a different league, as you realise. ECU will attempt to correct any influence you make to dizzy placement, within reason.
Lots of other cures for rough idle - search the Forums here....... IF YOU DARE!!!!! (Could be worse, you could search for "sports muffler" LOL).

ha ha yeah i have a good understanding of the car, like my last vehicle i got the workshop manual and studied it cover to cover, and i do ALL my own repairs (ive done bottom end bearings, head gaskets, brake overhauls, etc on a range of vehicles) and i know the relaitionship between these components, just hopin some one would know exactly what purpose the adjustment has on our engines, as like you say it is fully ECU controlled. im presuming its to establish the initial baseline upon which the ECU operates but like to know for sure. dont have any plans to adjust unless someone such as yourself, jason or alan had experimented and what results were achieved. my idle is pretty good, no needle movement and sits on 800 rpm once at operating temp. just get the slight vibration, although been a 3.5l V6, i think we will ever get them rolls royce smooth!! cheers anyway. just wanted to fill in the knowledge blank!!

HUSH yo mouth!!!

It is MOST unwise to mention me in same breath as Jason or AlanJ (or Mal/Madmagna) - unless its in the context of "these guys know heaps" versus "Phil knows bugger-all" - LOL. My strengths run to unclipping bits of plastic trim and swapping bulbs, mostly. And I've pulled my radio out about a bajillion times.

At a guess, I'd say that you need some range of "twist" in the dizzy mounting to be able to get the gears to mesh as you place/replace the dizzy, and like you say to get it roughly aligned in right timing.

One of the true mechanics or engine-build gods might pop-in and give a definitive statement, but I think you have the gist of it.

Our Diamante in the self-serve wreckers here has been comprehensively raped since last I saw it - the parcel-shelf Subwoofer has been removed - by a crowbar and sledge-hammer by the look of it - the grille and mounting trim broken in half .... WTF?? The circuit-board from the amp scattered around the boot. Seats are gone, hopefully to a good home. The blackout "KJ-style" cluster has been ruined completely.....
I swear some folks are headed straight to Magna-Hades for the sins committed at Pick-n-Payless!!

yeah at the local pick a part, alot of people ruin other parts removing things and leave doors open to the rain, ruing trims etc, its annoying. thanks for the replys. hey just a thought, i can get a rear muffler cheap of a diamante 30M, the 3l mivec version (199kW) and wondering if it will be better than my KE diamante one (verada)?? couldnt see any markings on it.

If its crazy-cheap, you might as well give it a go. If it sounds a wee bit louder its bound to be less-restrictive - our base cars have a quiet muffler, but Sports and VRX variants have a free-er flowing but bit-louder version which is known to allow bit more POWAAA!!

Can you spot any difference at all between the wreck and yours? Just check shape of flanges etc - they should be identical, but you never know.

Keep your eyes peeled for auto-dim mirrors amongst all those rare (to us) gems you see at pick a part!!

Moving the distributor does not change the timing on Magnas as far as I know. I remember Graham saying has made an adjuster plate so that he can move the crank sensor. I'll get him to send some photos.

He is going to fit it up when he fits his cams and heads. It may not be necessary but while he has the timing belt off he will fit it up and then there will be the option of altering the base timing if needed.

The other thought he had is that there may be the possibility of a fuel economy gain in closed loop mode when running 95 octane Premium or E10 with more timing advance.

Cheers,
Alan

You will find that there is bugger all movement and at that, it will make no difference to the timing

The issue with moving the CAS is you also move the injector timing with it, have expermineted with a few options in regards to the CAS all for bugger all gain and a lot of work. You do not want to advance too far as then your injectors fire too soon and half your fuel ends up sitting on closed valves.

There is no gear as such in the third gen, it is a lobe that lines up with the end of the cam

You will find that there is bugger all movement and at that, it will make no difference to the timing

The issue with moving the CAS is you also move the injector timing with it, have expermineted with a few options in regards to the CAS all for bugger all gain and a lot of work. You do not want to advance too far as then your injectors fire too soon and half your fuel ends up sitting on closed valves.

There is no gear as such in the third gen, it is a lobe that lines up with the end of the cam

I checked back with Graham regarding the adjustment range of his crank sensor plate and it changes the base timing of 5 deg to any figure from about 3 deg to 16 deg.

With correct port sizing we have never found injector timing to be much of an issue, except with direct injection. At cruise many systems are timed to finish injection just before inlet closing so small changes in injector phasing usually don't affect economy and emissions. At high rpm and wide open throttle the injector duty cycle is probably 80% or more, so even with sequential injection the injectors are spraying while the inlets are closed. With the previous batch fire systems the injectors fired without regard to valve timing.

Cheers,
Alan