DrTurbo

Anyone out there running an electromotive TEC 2 or 3 that has figured out good starting parameters for their map? I have been running a TEC 3 on my 3rd gen for a long time and am still having hot start issues. I have spent a lot of time trying to work out the right combination of starting parameters to get a nice first crank start under all conditions: stone cold, warm, and hot. I have yet to get it figured out. I still have the most problems with a hot start. I know this is a tough problem for the rotary as Mazda even had some difficulty with it. Any help I could get would be greatly appreciated. I would be happy to share my map with anyone who could help out.

TIA

Dan

Anyone who is running a TEC on rotary that just wants to exchange tuning ideas, PM me. I know there are not a lot of us out there. Maybe we can help each other out.

Nitrometano

here are my starting enrichment settings for my bridge ported engine.
SE0 200%
SE1 20%
PW0 2ms
CLT0 -20*C
ASE0 20%
ASE1 3%

My engine idles at 1,500 rpm, with this setting the engine to idle at 1000 in the night until it warm up an hit the 1,500 RPM. I think I need to modify again to get a better idling. Starting is fine. The engine start inmediatly.

What are your settings?

DrTurbo

Nitormetano,

Thanks for your help.

My engine has stock porting. Not sure if our porting differences will effect required starting enrichments. Here are mine:

SE0 180%
SE1 90%
PW0 0ms
CLT0 40C
ASE0 50%
ASE1 10%

I haven't had a chance to try your settings out yet but I plan to do it today. Since everything is in percent of fuel pulse width (FPW), I think I might also need to know a few more things about your setup in order to compare your start fueling to mine. It might also help to know something about your cranking and idle advance settings. Can you answer a few more questions for me?

1) How big are your primary injectors? Mine are the stock 550cc.
2) What are your UAP and POT?
3) How is your mechanical advance set? Do you have your trigger wheel set so the 11th tooth is aligned with the sensor at TDC like the manual recommends? Mine is set at the 11th tooth. What are your TDC setup settings (under Basic Engine Parameters/Advanced Engine Settings)? I have mine set to the 14th tooth so I can run retard at idle like the factory ECU.
4) How much advance are you running at idle?
5) What are your minimum MAP and RPM breakpoints?
6) What do you have your initial advance set to (below the advance table)?

All the advance setup questions are to try to get a handle on what advance you are running during cranking. I know that will have an effect on starting in addition to the fueling. Thanks again for your help. I have been playing with my TEC on the rotary for a long time. If you have any questions I might be able to help you with, ask.

Nitrometano

the answers:
1. Stock 550cc. I think I would use 1680 for secondaries. Engine get leans at 4,000.
2. I dont find in my Tec 2 the UAP and POT, maybe the terms are different.
3. I use 2 crank sensors. One at the 9th and the other on the 11th toot with pulley at TDC.
4. 15 flat around the table
5. MAP 30-100 and the RPM 1,000-8,000
6. 18

I need more fuel at staring because my ports are bigger that the stock. But I have an a/f ratio about 14.

DrTurbo

I tried out your starting parameters on my car over the weekend. It seems to hot start pretty consistently now. Unfortunately, when I tried to cold start it yesterday, it refused to start. I don't think it was getting enough fuel when cold with your settings. I have had this problem before with settings that would work hot but not cold and vice-versa. The temperature in LA is getting down to about 10C at night right now. What are your overnight low temps? I made a few minor mods to your settings to try to get more temperature dependent fuel when cold:

PW0 3ms
CLT0 30C
ASE0 50%

With these changes, the car started OK this morning at a coolant temp of 15C. I will try later today to hot start it and see how it goes.

Where do you have your coolant temperature sensor mounted? Mine is in a hose fitting spliced into one of the heater core lines. It dawned on me yesterday that this may be contributing to my starting problem since the coolant there probably cools a lot faster than in the rotor housings after the engine is shut down. So on a warm start, my coolant temp reading might be a lot lower than the actual engine temperature. If I can't get things to work, I might try relocating my coolant temp sensor to somewhere on the engine. Any ideas???

Nitrometano

The average night temp is 75F. My coolant temp sensor is mounted on the stock place at the water pump housing. I re-taped the original water temp sensor thread and I installed an GM one. Maybe you can try this location.

I think you can try to add fuel via the Fuel Enrichments - Warmup Parameters and Graph. Try to add number to this table, maybe you can find the fuel that you need to your cold start.

Nitrometano

I forgot to mention that the timing that I have on the advance timing table is just for start the engine and drive around the corner. I have not complete yet the advance timing table that the engine needs. I'm just seraching information about how much timing advance I need to run for the engine.