Alright, I know this is long, but I need help from you guys! I've been building and working on my brother's first gen for a few years now, I've been messing with this computer since August or so and i'm really trying to get it running good for Rotary Revolution. It's a '79 Mariah widebody with a 13B Turbo, 3mm seals, etc. Basically, it's all aftermarket stuff including the EMS 4424 Stinger ECU --- http://www.enginemanagement.com.au/p...roducts_id=107 --if you want to look at it, etc.

Basically, what I'm really looking for is an ignition map, or basically, numbers for it. The "chart" that I have in the software (which is downloadable at this site) goes as follows: 25 boxes going across -- 0 to 12,000 rpms---500 rpm's each box. ex.) 0, 500, 1000, 1500, etc. Then it has 11 total boxes going down---each row going across is for one steady pressure. The numbers going down the side of the chart are in kilopascals and go as follows: -80kpa, -70kpa, (down to) 0 kpa, then 75 kpa, and lastly 150 kpa. For a total of 275 boxes. What I really need to know is what kind of numbers I need to work with. (As for fuel, though, I'll be able to deal with that afterwards.) The numbers go for the entire row for that specified pressure and what I have so far goes as follows: 25 degrees advanced except for first four blocks which are 0 degrees, 20 degrees and first four at 0, 18 degrees and first four at 0, 16 degrees and first four at 0, then 15 degrees, 14 degrees, 13 degrees, 12 degrees, 11 degrees (which is at 0 kpa), 10 degrees at 75kpa, and 5 degrees at 150kpa. If I haven't lost you by this point, then I really hope you can help me out!! BTW, with these current settings, as long as it stays in that 0 degree range at high vacuum and under 2000 rpm's, it runs great!! Once that timing starts advancing, it runs like crap!! Please, help me out!! (BTW, I'm getting it to a dyno real soon, but I'm really concerned about the ignition!)

Thanks in advance,

Brian H.

you wanna make sure that the ecu agrees with reality by checking the timing with a timing light. it might also be that its not firing the trailings correctly, so you wanna check that too

Yeah, the timing is pretty close to 0 degrees at or near idle. Unfortunately, this computer is set up for direct fire, which means that the the leading and trailing are firing at the same exact time. I've been having alot of headaches with trying to get answers and solving "problems" with this computer. I bought it from Australia where it's made, and the only place in America that sells it is PTR Injection in Spokane, Washington -- www.ptrsds.com

Recently I installed their 3-coil external ignitor module (EMS as well) in hopes of a more steady spark. This didn't exactly fix it. When using the timing light, the spark looks shaky and unsteady, and sometimes it'll fire way too early or late (the light will flash, but I won't see a mark). I'm running magnecor wires with enough resistance, MSD blaster coils for trailing, and TII leading coil with a 6A MSD. Anymore questions, please ask.