Mr Urbalizer has been going on about the "can timeing" mods and as my engine is coming out and going to be remapped i just wondered if any of the "boys in the know" could explain to me what is done , is the cam re-profiled or do they move the cams around another tooth on the belt ? just trying to get it right in my head thats all .



p.s did a search but there seems to be very little mention of it .

No cam timing changes have proven to be necessary (or desirable) for U.S. tunes that are quite adequate, thank you .

adjusting the cam timing is simple - retard the exhaust cam by one tooth !

thats how the m400's were done

It is just a simple mod, you may lose mid range torque, without the mod the torque rises rapidly to 4000rpm then starts to level off, with the mod, the torque line keeps steadily rising to high revs, you end up with a smoother power curve that results in more high end power, so as a driver you get smoother acceleration, and at around 5500rpm you can expect the car have around 20 more torques to play with.

You need a good mapper to take advantage of this mod properly, i would recommend Darren if in midlands or north, or Trevor if down south.

What other work are you having done Tuxman? this mod works well with dual exhaust/fuel pump upgrade as the factory exhaust creates another restriction, but do not expect any massive increase in red line, as the valves start to float(not close properly) at high rpm due to weak valve springs, optimal gear change would be at about 6000-6200rpm, if you want to put in stronger valve spring kit, it is easier and cheaper to sort this at same time as cam timing.


Lots off stuff done.......lots to do !!!! hopefully in the end it will have the performance of my old Ultima .........but with a better chasis .

I hope so...had an Ult for 2 weeks ( on loan from a mate ) and after an hours driving I couldn't wait to get out to calm my janggling nerves.

It is just a simple mod, you may lose mid range torque, without the mod the torque rises rapidly to 4000rpm then starts to level off, with the mod, the torque line keeps steadily rising to high revs, you end up with a smoother power curve that results in more high end power, so as a driver you get smoother acceleration, and at around 5500rpm you can expect the car have around 20 more torques to play with.

You need a good mapper to take advantage of this mod properly, i would recommend Darren if in midlands or north, or Trevor if down south.

What other work are you having done Tuxman? this mod works well with dual exhaust/fuel pump upgrade as the factory exhaust creates another restriction, but do not expect any massive increase in red line, as the valves start to float(not close properly) at high rpm due to weak valve springs, optimal gear change would be at about 6000-6200rpm, if you want to put in stronger valve spring kit, it is easier and cheaper to sort this at same time as cam timing.

Are you sure abut this, Advancing or retarding the cam timing is just going to move the power band up and down, can the person who told you this provide a graph showing power output V rpm at different timings.

I seem to remember Yellowshed saying that wasn't the case. All cam timings were the same.