Camshaft upgrades anyone?

[Grieke]

I did a new (not regrind) PDR in my 05. I was mostly concerned with retarded cam timing hurting performance and mpg's.

I changed only the cam, not tappets per PDR's recommendation on the mileage.

Their grind also does not require springs.



I get a little smoke if I don't roll into the throttle easy where the stocker I didn't but I am not so sure thats the cam cuz I bumped up the injection timing 3 degrees at the same time.



Other than that what lmills said sounds like what I would have wrote.

How did you bump up the injection timing by 3*?

Thanks for your time.

GR

 

[Matt400]

How did you bump up the injection timing by 3*?

Thanks for your time.

GR

I removed the lower crankshaft pulley and elongated the mounting holes in the crankshaft sensors tone ring.



What I did was mark the engine on the passenger side shroud bracket by scribing around one of the tone teeth as a reference to where the wheel was before removing it. I then ground the dowel hole and mounting holes to allow enough clockwise rotation to move a tone wheel tooth out of that scribed area so a tone wheel "notch" lines up where a "tooth" once was.



My calcs say thats 3 degrees



58 teeth with 2 missing = a 60 tooth wheel.

360 divided by 60 = 6 degrees for every tooth.

I didn't move it from one tooth to another, but from one tooth to a notch which fools TDC reference by 3 degrees.



360 divided by 120 notches and teeth = 3 degrees.

 

[Grieke]

I removed the lower crankshaft pulley and elongated the mounting holes in the crankshaft sensors tone ring.



What I did was mark the engine on the passenger side shroud bracket by scribing around one of the tone teeth as a reference to where the wheel was before removing it. I then ground the dowel hole and mounting holes to allow enough clockwise rotation to move a tone wheel tooth out of that scribed area so a tone wheel "notch" lines up where a "tooth" once was.



My calcs say thats 3 degrees



58 teeth with 2 missing = a 60 tooth wheel.

360 divided by 60 = 6 degrees for every tooth.

I didn't move it from one tooth to another, but from one tooth to a notch which fools TDC reference by 3 degrees.



360 divided by 120 notches and teeth = 3 degrees.

Hi Matt,

Thanks for your reply. I believe your methode is what is called the "tone ring mod" around here. I have been thinking about that before.

Don't you have to manipulate the cam sensor too, in order to maintain relationship with the crank sensor?

Thanks again for your time.

GR

 

[Matt400]

Don't you have to manipulate the cam sensor too, in order to maintain relationship with the crank sensor?

If the sync between the two sensors gets far enough out you can get a check engine lamp, with 3 degrees I have not seen this. There is a fella that sells a modified crank shaft sensor that will do 2 degrees.