are there any ill effects to running without the trailing coils?
01-18-13, 07:18 PM
#1
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are there any ill effects to running without the trailing coils?
I just would like to know will there be any negative effects on the engine without trailing spark. Does anyone have any experience with this?
01-18-13, 07:33 PM
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Eh, not really... Nothing that will kill an engine if driven reasonably. I wouldn't run it on just leading spark for too long. Get some trailing coils if you need them.
I had my first set-up tuned on only the leading coils. (Due to trailing coil malfunction.)
I had my first set-up tuned on only the leading coils. (Due to trailing coil malfunction.)
01-18-13, 09:53 PM
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I guess I should've explained more. I have a crane hi-6 cdi box on the leading coil. I have the unit setup to kill the trailing coil when I engaged the two step rev limiter. The issue is when I use the two step trailing coil turns off but doesn't come back on until the car is turn off and then turned back on. So if I launch using this I can only run on the leading coil. I'm using a rtek 2.1 with my setup btw but that shouldn't matter I believe.
01-18-13, 09:58 PM
#5
I guess I should've explained more. I have a crane hi-6 cdi box on the leading coil. I have the unit setup to kill the trailing coil when I engaged the two step rev limiter. The issue is when I use the two step trailing coil turns off but doesn't come back on until the car is turn off and then turned back on. So if I launch using this I can only run on the leading coil. I'm using a rtek 2.1 with my setup btw but that shouldn't matter I believe.
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01-18-13, 10:49 PM
#7
I would try to see if there's a way to get the trailing coil to turn back on after its cutting off so you'll still be provided with that spark.
I'm not familiar with 2 step or standalone ecus but I'd venture to say theyd incorporate a design that keeps the trailing coil from staying off, it'd just be more logical (imho)for it to turn back on
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01-18-13, 10:58 PM
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I've tried that route for months. Can't find how to keep it on. I raced a Chevy SSR and left him pretty good on two plugs but I didn't notice any power loss. I was just want input for someone who has ran like this at the track or something.
01-18-13, 11:55 PM
#9
You'll need a way to record it though, does the rtek have those capabilities?
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01-19-13, 12:05 AM
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Yes, I can datalog. I don't know why I didn't think about that before. My wideband is down by the ashtray so it's kinda hard to keep and eye on. I will def give it a shot though.
01-19-13, 12:45 AM
#12
The rotary really only NEEDS the leading plugs. The trailing plugs do little in the way of power and driveability and are primarily for emissions cleanup. In fact I have known of people who drove around on a dead trailing coil and did not know it for a long time. I have in fact driven cars like this as well and the only thing you may notice is a very slight change in it's personality during startup and a very slight change in the low rpm torque characteristics when taking off from a stop or on a hill.
In fact a few years ago KD rotary came up with the infamous "anti detonation mod" which they tried to keep secret for a while, promised to help modified turbo rotaries live longer. It was eventually discovered that they were inserting these tiny aluminum dummy plugs on the end of the trailing spark plugs, to fill the holes in the rotor housings, then unplugging the trailing coil and changing the computer tuning a bit.
I wouldn't do it just to be doing it, but if there's a specific reason then it won't hurt the engine as long as you rev it up often enough to displace any extra carbon built up on the trailing edges of the rotor faces. That's really all the trailings do, attempt to clean up the little "pocket" of unburned fuel left at the trailing edge of the rotor face as the combustion chamber narrows and gets "pinched off" as the rotor passes the trailing plug. It's mostly for emissions purposes.
In fact a few years ago KD rotary came up with the infamous "anti detonation mod" which they tried to keep secret for a while, promised to help modified turbo rotaries live longer. It was eventually discovered that they were inserting these tiny aluminum dummy plugs on the end of the trailing spark plugs, to fill the holes in the rotor housings, then unplugging the trailing coil and changing the computer tuning a bit.
I wouldn't do it just to be doing it, but if there's a specific reason then it won't hurt the engine as long as you rev it up often enough to displace any extra carbon built up on the trailing edges of the rotor faces. That's really all the trailings do, attempt to clean up the little "pocket" of unburned fuel left at the trailing edge of the rotor face as the combustion chamber narrows and gets "pinched off" as the rotor passes the trailing plug. It's mostly for emissions purposes.
01-19-13, 07:35 AM
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The rotary really only NEEDS the leading plugs. The trailing plugs do little in the way of power and driveability and are primarily for emissions cleanup. In fact I have known of people who drove around on a dead trailing coil and did not know it for a long time. I have in fact driven cars like this as well and the only thing you may notice is a very slight change in it's personality during startup and a very slight change in the low rpm torque characteristics when taking off from a stop or on a hill.
In fact a few years ago KD rotary came up with the infamous "anti detonation mod" which they tried to keep secret for a while, promised to help modified turbo rotaries live longer. It was eventually discovered that they were inserting these tiny aluminum dummy plugs on the end of the trailing spark plugs, to fill the holes in the rotor housings, then unplugging the trailing coil and changing the computer tuning a bit.
I wouldn't do it just to be doing it, but if there's a specific reason then it won't hurt the engine as long as you rev it up often enough to displace any extra carbon built up on the trailing edges of the rotor faces. That's really all the trailings do, attempt to clean up the little "pocket" of unburned fuel left at the trailing edge of the rotor face as the combustion chamber narrows and gets "pinched off" as the rotor passes the trailing plug. It's mostly for emissions purposes.
In fact a few years ago KD rotary came up with the infamous "anti detonation mod" which they tried to keep secret for a while, promised to help modified turbo rotaries live longer. It was eventually discovered that they were inserting these tiny aluminum dummy plugs on the end of the trailing spark plugs, to fill the holes in the rotor housings, then unplugging the trailing coil and changing the computer tuning a bit.
I wouldn't do it just to be doing it, but if there's a specific reason then it won't hurt the engine as long as you rev it up often enough to displace any extra carbon built up on the trailing edges of the rotor faces. That's really all the trailings do, attempt to clean up the little "pocket" of unburned fuel left at the trailing edge of the rotor face as the combustion chamber narrows and gets "pinched off" as the rotor passes the trailing plug. It's mostly for emissions purposes.
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