I had a chance today to compare the grey and black CPS's side by side, and give you guys some results that you can actually see. I took several pictures showing the size variations, as well as showing the differences in the magnetic strength. The results are conclusive, there are distinguishable difference between the two. Check it out with your own eyes.
First, here are the results of AE
and the changes in cylinder rotation. Most cylinders remain mostly the same, however notice the distinct changes in the #3 and #8 cylinders. My #8 drops to zero because I'm running a regulated return and an AD injector instead of an LL. Those with LL injectors probably won't see 0% on #8. I put down the ranges that I saw with each cylinder, with the minimum and maximum values seen after monitoring each cylinder for more than 1 minute each. Engine was completely warmed up each time, with extended drive cycles to ensure that testing was fair and equal.
:________ Black CPS
1) 0.2-1.2%______ 0.2-0.9%
2) 0.7-1.2%______ 0.7-1.2%
3) 1.6-2.4%______ 0.0%
4) 0.0-0.7%______ 0.0-0.8%
5) 0.0%__________ 0.2-0.7%
6) 0.0%__________ 0.0%
7) 0.0%__________ 0.0%
8) 1.7-2.6%______ 0.0%
The next two pictures show the differences in size. The black CPS
is obviously wider than the grey, but if you look closely you can see that it is also slightly longer. For the length comparison, I stood them upright side by side on a level surface so you can see the slight difference.
Now for the last two pictures, I found a washer that was heavy enough that the grey CPS
couldn't pick it up off the table, but the black CPS
had no trouble picking it up every single time. In fact, the strength difference was incredible, as I could move the black CPS
in any direction I wanted and with some force, and the washer wouldn't fall off. The grey one on the other hand could barely lift a corner of the washer off the table, but never could lift the entire thing.
This is all the testing I could think of. Unfortunately I don't have other testing materials such as an oscilloscope to compare signal differences between the two. A while back, Swamps offered to run a test between grey and black CPS's using a cam timing gear, a variable speed motor, and an oscilloscope to see if they could in fact find signal differences between the two sensors. A test like that would verify what many PSD
owners have seen with scanners hooked up to their trucks. If they do move forward with that test, I would be very interested to see the results.
On my truck, the grey CPS
did not pose enough of a problem to actually trigger a check engine light, or to fail the CCT. However, results may vary with other engines. It is obvious that there is an effect on the #3 and #8 cylinders. Most of the rest remained about the same, with only a small rise on #5 with the black CPS
Right now I am taking a guess that the weaker magnet and slightly shorter sensor has an effect on when the CPS
actually picks up the cam timing gear, which would have an effect on injection timing as well. Feel free to discuss or post up ideas or additional information.