mojorick

XKLABA, I have not tested the Honda coils - Maybe will take a look next time I set up the bench. scotty, Even if you could understand the test criteria I use, I doubt that it would change your made up mind. The testing I did was mainly to compare two known good systems as used in the 2J world. It was not meant as a substitute for real world function, which incidentally has supplemented and validated my testing hundreds of times over. The overdwell characteristic of the truck coils is well documented and is totally in control and safe by correct EMS setup. I have seen many of the local Nissan guys using the VQ coils with good results. Sorry I called your baby (Yaris coils ) ugly....

If it's the GM part 10457730 ( and actually has that number on the box) , That's the genuine AC Delco D585. Lots of cheap AC Delco BSC-1251 on ebay, advertised as D585/BSC-1251 - Made in China. I actually ordered a set of these and tried them on a customer car - on the dyno they worked fine until about 20 psi, then started to misfire. My bench test confirmed that they just don't deliver the plug current of the OEM part. I contacted AC Delco the see if this was a real branded part, and they confirmed that it was - a lower cost, lower performance coil. Tons of these in American junkyards - the used coils have been super reliable in the field.

scotty, Toyota Guys in the US (and in Australia) are increasingly using the GM truck (not tractor) coils. There are about 400 of my kits out in the worldwide Supra community. They are built with an igniter (not just a simple switch transistor) that can build charge much like a CD amplifier. This enables the use of increased dwell for more output. I have also verified that the D585 produces more plug current than the stock 2J coil given the same dwell, even using the HK$ DLI. These coils were put on flex fuel vehicles and were designed for increased spark power. The genuine AC Delco D585 coils are mostly made in Mexico. Rick, I have done some coil testing using a current probe and an oscilloscope to monitor output current, in addition to looking at igniter current across a shunt resistor. These two measurements give some insight into coil saturation point as well as ultimate spark power. My cheap current probe does not deliver values easily translated into amperage, but does make an excellent tool for comparisons. I am a retired test engineer, and still love this geeky stuff. Just wish I could afford better equipment. The link shows comparison between the GM D585 and the Toyota 2JZ- GTE coils with DLI box. I was trying to test the 1ZZ coils (same as the Yaris I think) but they didn't like the shunt resistor so those results are not valid. I did later verify that the 1ZZ provides about the same spark output as the Supra TT coils sans DLI. I have similarly tested several "parts store" type coils and found that none of them provided the performance of the "real' D585s. I do plan on doing more testing with better documentation when I get time, especially interested in the MSD and Accel parts. http://www.mojoperf.com/drupal/node/17#overlay-context=user/1

I have not tested the MSD coils - But so far have found no aftermarket items that match the spark plug current provided by the OEMs. Accel also makes a D585 copy that I intend to test when I get the time.

Oops, This was my first production Series 1 harness and my instructions were wrong - Mirror imaged the igniter input connector . Looks like it's straightened out now. rickskylinenr32gtrjp, Let me know how this works for you.

The GM D585 coils are perfectly safe when dwell is kept below 4.0MS. There are numerous 2jZs in the US successfully running boost in the 40s at 3.4 MS dwell with the truck coils. Out of several hundred users of my 2JZ coil-on plug kits, I have had reports from only 3 having misfire problems caused by coils. The overdwell timing drift is well understood - I have personally seen blown engines, both 2J and RB from this cause. It does seem to be ECU type dependent, as I ran 5.0 with my Haltech PS2000 for a year with no issues. (I have since reduced dwell with no apparent detriment) The failures I've seen are with Proefi and AEM. The upshot here is that there is no need to go above 3.4 with good coils, good tune, and no other problems. There is some evidence that some coils misfire due to overheating - I'm investigating that now.

This has been my experience with the Non-OEM copies.

There is no need to push the D585 into the timing drift areas with big dwells. Safe sub- 4.0MS dwell numbers have supported over 1000whp.

To each his own. The D585 is the only one that lends itself to on-plug installation (And has an available bracket system ). Personally, I hate plug wires.

The overcurrent conditions mentioned apply to the round truck coils with the heat sinks on top - . I think this is a consequence of mounting directly on-plug without the resistive plug wires as in stock use. I have not heard of this occurring with other LSx coils, but then all the others do not lend themselves to on-plug mounting. This is a fortunate coincidence as the truck coils deliver almost 2X the spark power of any of the others.

Correct . The "R" in the NGK plug part number denotes resistor type.

It is also important to use resistive type spark plugs with the COP installation of these coils. Non-resistive plugs cause the coils to go into the overcurrent mode and drift/overheat. polzin, I'll get out my diagram and post pin numbers shortly.

Some info on using the GM truck coils: Although spark power does increase with dwell times up to 6MS, dwell should be kept below 4.0 MS, only increased while closely monitoring for timing drift. These coils have an overcurrent protection mode (probably aggravated by the non-use of resistive plug wires in this application) that will cause timing drift in the ADVANCED direction. I know of several 2JZ engines (and 1 RB) gave been destroyed on the dyno by too much dwell. This seems to be somewhat dependent on type of ECU used but it pays to be safe. 2JZ users have made well over 1K WHP at boost levels in the 40s using 3.5 MS dwell. To be sure of quality and performance, use only AC Delco D585, GM part 10457730. Many of the replacement (Chinese copies) coils do not provide the performance of the AC Delco pieces.