Texas Two Step Taco

Heat cycle #2 with 19 degrees or 2.20mm BTDC for 5 minutes ran cooler at 171 degrees CHT


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None of us get it right first time. It takes a lot of work to get it right.

Checked the polarity and it was correct. So the static angle on the plate was off 13 degrees. Guess my eyes are not what they use to be. So the static angle in the computer is now 43 degrees and that gave us 18 degrees BTDC on the timing gun and the map.


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Heat cycle #2 with 19 degrees BTDC for 5 minutes ran cooler at 171 degrees CHT

Light the fire too soon and pressure peak builds before it is supposed to (around 14 - 15 degrees ATDC) and the motor is working against itself which raises temperatures and pressure in the combustion chamber.

Too late and it's still burning as it travels down the pipe which raises EGT.

And when it detonates, CHT rises and EGT falls - just to add to the confusion. In other words. keep a record but focus on the power it's making rather than CHT or EGT. Ask BB what data he looks at on the data logger and if it's possible to watch gauges and warning lights on a run. I think teh answer is to set it up on the dyno and then adjust only for known variables such as change in R.A.D. Relative Air density. That of course assumes that you are using one on your dyno runs.
 
Heat cycle #3 5 minutes varying the revs 20 degree or 2.44mm BTDC temperature Max was 196 degrees.
IMG_7480.jpg



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Light the fire too soon and pressure peak builds before it is supposed to (around 14 - 15 degrees ATDC) and the motor is working against itself which raises temperatures and pressure in the combustion chamber.

Too late and it's still burning as it travels down the pipe which raises EGT.

And when it detonates, CHT rises and EGT falls - just to add to the confusion. In other words. keep a record but focus on the power it's making rather than CHT or EGT. Ask BB what data he looks at on the data logger and if it's possible to watch gauges and warning lights on a run. I think teh answer is to set it up on the dyno and then adjust only for known variables such as change in R.A.D. Relative Air density. That of course assumes that you are using one on your dyno runs.

Will do. I find this fascinating and plan on surviving the dyno this time. It is very interesting how one degree of timing can make such a difference.


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Heat cycle #4 for 5 minutes 22 degrees or 2.94 mm BTDC temperature 210 degrees F.


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Matt will you take a look at this? I want to use one of the ignition maps like a two step. I would like to use one ignition map activated by a clutch switch. And then when the clutch is let go it switches to the main map. It looks like the map switch is nothing but an on off switch. What do you think? https://www.zeeltronic.com/manuals/WIRING_PDCI-15V.pdf


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Brown/green wire to switch the map? Seems reasonable to use the clutch switch for this, but how is the selection made? Are there only two maps? Does the map toggle between the two every time the clutch is pulled?
 
Brown/green wire to switch the map? Seems reasonable to use the clutch switch for this, but how is the selection made? Are there only two maps? Does the map toggle between the two every time the clutch is pulled?

Two maps. Those are good questions. Time to test.



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If I were to venture a guess, I suspect the map will change every time you pull the clutch lever rather than when you pull it and then again when you release it.

So first gear on one map, second on another map, then third gear is back to the first map again. :p
 
If I were to venture a guess, I suspect the map will change every time you pull the clutch lever rather than when you pull it and then again when you release it.

So first gear on one map, second on another map, then third gear is back to the first map again. :p

We are using an air shifter and no clutch after the launch


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Clutch is only used twice on a run- at launch and at the other end. BUT you will also use it to move to the line and or for burnouts, so that could be problematic.

On Ignitech systems, the clutch witch acts as an on-off. On acitvates the launch RPM limiter. Let the clutch out and the revs are allowed to come up. If your switch allows connected to ground to be one map and open is the other map you should be in good shape.
 
“ANY switch will do the map switch is just switched to earth, if it's earthed it's map2 open then map 1”. Found this on another two stroke forum for the Zeeltronic map switch.


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Typically a clutch switch is grounded when the clutch lever is out (clutch engaged) and open when the lever is pulled in. So in that case, IN = the Launch limiter and OUT means main curve.
 
Typically a clutch switch is grounded when the clutch lever is out (clutch engaged) and open when the lever is pulled in. So in that case, IN = the Launch limiter and OUT means main curve.

Thanks teazer. Did the last heat cycle on the stand last night. Tested a curve to start see how fat we can make the curve and limit revs. This is 19 degrees BTDC to 13 BTDC. This proves that a Taco will run at 1mm BTDC.

How Rich will we need to be and will we foul plugs on the line? There is Rich, Richer, and then Richard. Three degrees of rich!

Interesting this may take care of our seizure worry on the starting line. However we may still need to go to a two step.


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Here is how one guy built his own two step. Very interesting.


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Clutch is only used twice on a run- at launch and at the other end. BUT you will also use it to move to the line and or for burnouts, so that could be problematic.

On Ignitech systems, the clutch witch acts as an on-off. On acitvates the launch RPM limiter. Let the clutch out and the revs are allowed to come up. If your switch allows connected to ground to be one map and open is the other map you should be in good shape.



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Just want to give credit where credit is due... this was Borut’s idea from Zeeltronic.
“The only way could be to program second ignition map to act as rev limit and use map switch for launch control.
At limit revs and above you can try with programming 0deg advance, or large advance. High advance could be problematic...depend on the engine.
Regards,
Borut”

Tonight we will test 0 degrees BTDC. We will stay away from high advance ;).

I ordered the two step Kawasaki clutch lever and a shift light from



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Timing retarded to 0. Tomorrow we will hook up a switch.


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