Quote:
Originally Posted by Brian Carlton
I had high hopes that this would be a viable solution, however, your previous data on this subject from 2005 doesn't seem to hold much promise. The results with the stock 750 ohm resistor versus the results without the resistor are effectively the same:
M103 spark advance map
Have you found any further data that can get any additional advance out of the EZL? Be nice to add another 6-8 degrees at 2000 rpm upward. |
...interesting to read that post several years later. Perhaps I did not give enough time to let my SOTP form an impression, but removing the resistor definitely improved the low end torque once I had some experience with it and allowed me to alter my driving style and considerably increase urban driving fuel economy as I stated in my June 9 post.
It's also possible that I screwed up the test.
As I said, I invite everyone else to do the same test.
There are numerous EZL modules, which have different characteristics including both initial advance and different advance-RPM characterisitcs depending on the R16/1 value. I think the details are in the service publications, but for a given EZL module, the only way I know of to alter the advance curve is by using different R16/1 resistances. The initial timing is fixed by the EZL and is not adjustable, but different EZLs may offer different initial timing values.
It's possible that the increase in low end torque is less noticeable on automatics because if you apply significant throttle below converter stall speed the engine will immediately rev to the stall speed. I don't know what the automatic converter stall speed is, but 2000 is typical. You can test yours by firmly applying the brake at a dead stop, then floor the throttle for a couple of seconds and read the tach.
My experience with my five-speed and no R16/1 resistor installed is that I can drop it into fifth gear on a level road at 35 MPH, which is about 1300 revs. If traffic slows to 30 (1100) and then increases back to 35, I don't bother to downshift. With the OE 750K ohm resistor installed fifth was not useable below about 45 MPH.
My major complaint with the M103 was always lack of low end torque, but that's not the case, today. It now has the broad torque bandwidth of my favorite Corvette SHP engines. I call it "half a L-79" - the 327 CID, 350 HP Corvette engine from '65 to '68 that will easily pull from 1000 revs in top gear and make useable power to 6500.
Now if I can find a LSD 3.27:1 axle from the US version 16V, the car will be perfect!
Duke