Crazy Tach Needle, Breaking Up, Ignitor or Coil?
11-12-2010, 12:26 PM
#101
Honda-Tech Member
Re: Crazy Tach Needle, Breaking Up, Ignitor or Coil?
I know for a fact that the nology icm will trigger
a msd,accel,mallory,crane cdi ignition.
I am using one and it's triggering my msd unit.
a msd,accel,mallory,crane cdi ignition.
I am using one and it's triggering my msd unit.
11-12-2010, 12:48 PM
#102
Honda-Tech Member
Re: Crazy Tach Needle, Breaking Up, Ignitor or Coil?
The easy solution is to bypass the ICM all together and get a M&K ignition system, problem solved. I built this circuit a while ago and mines is modified quite a bit. If you want to use this circuit above you can easily get a diode and that will prevent any reverse current from going back to the ECU. But you are still running an ICM whether its OEM or you built it yourself and one more item in the loop to troubleshoot. Spend the money and get a M&W kit , problem solved no more ICM period.
11-21-2010, 10:18 AM
#103
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Re: (pgpbubble)
Its due to 1k ohm resistor that goes to yellow/green from the 12v. That circut was also designed with a ztx857 which in reality was a poor choice and heats up under high load. a mosfet would be more appropriate here or a high amperage transistor can be used. the circut i have sitting in front of will handle more amperage then the 15amp fuse that powers the circut. the ztx857 is only good for 3 amps.
fyi hard switching a transistor will give you a nasty elbow on the sine wave...this is what will ultimately burn them out....you can hard switch a mosfet and still get an almost square wave out of it.
What is the purpose of the adapter? To drive the Points input wire of an MSD. It doesn't need to be able to blow a 15A fuse.
The MSD Points input has an internal 5 Watt 47 ohm pullup resistor to the battery.
14v/47 ohm = 0.3 amps. The Zetex 857 can handle ten times the current required. Plus it's high voltage so it's protected from transients.
I used the ZTX857 because they can handle the load and was using them as output drivers in my 1ch/2ch version. Plus they have the same foot print as a PN2222.
As to the circuit "pushing current into the ECU", that's how open collector output drivers work. Actually, the ECU driver PULLS current in but I won't flame you for getting it backwards.
Assume the ECU has a garden variety NPN surface mount transistor as the output driver, such as an MMBT2222. It's rated for 0.6 amps, and all we are asking it to do is 14v/1k = 0.014 amps. 14 milliamps. No problemo.
Where does that current go when it gets inside the ECU? To ground. Big deal.
If you are worried, use a 10k and it will still work. 14v/10k = 1.4 milliamps.
Everything else you are saying is fluff to make you sound smart and sell your adapter.
For you DIYers, use a MOSFET if you want, rated for a few amps and 100v minimum.
Check out the new versions on my site, especially the Interceptor.
11-23-2010, 12:15 PM
#105
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Location: Chattanooga, TN
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Re: (pgpbubble)
What is the purpose of the adapter? To drive the Points input wire of an MSD. It doesn't need to be able to blow a 15A fuse.
The MSD Points input has an internal 5 Watt 47 ohm pullup resistor to the battery.
14v/47 ohm = 0.3 amps. The Zetex 857 can handle ten times the current required. Plus it's high voltage so it's protected from transients.
I used the ZTX857 because they can handle the load and was using them as output drivers in my 1ch/2ch version. Plus they have the same foot print as a PN2222.
As to the circuit "pushing current into the ECU", that's how open collector output drivers work. Actually, the ECU driver PULLS current in but I won't flame you for getting it backwards.
Assume the ECU has a garden variety NPN surface mount transistor as the output driver, such as an MMBT2222. It's rated for 0.6 amps, and all we are asking it to do is 14v/1k = 0.014 amps. 14 milliamps. No problemo.
Where does that current go when it gets inside the ECU? To ground. Big deal.
If you are worried, use a 10k and it will still work. 14v/10k = 1.4 milliamps.
Everything else you are saying is fluff to make you sound smart and sell your adapter.
For you DIYers, use a MOSFET if you want, rated for a few amps and 100v minimum.
Check out the new versions on my site, especially the Interceptor.
The MSD Points input has an internal 5 Watt 47 ohm pullup resistor to the battery.
14v/47 ohm = 0.3 amps. The Zetex 857 can handle ten times the current required. Plus it's high voltage so it's protected from transients.
I used the ZTX857 because they can handle the load and was using them as output drivers in my 1ch/2ch version. Plus they have the same foot print as a PN2222.
As to the circuit "pushing current into the ECU", that's how open collector output drivers work. Actually, the ECU driver PULLS current in but I won't flame you for getting it backwards.
Assume the ECU has a garden variety NPN surface mount transistor as the output driver, such as an MMBT2222. It's rated for 0.6 amps, and all we are asking it to do is 14v/1k = 0.014 amps. 14 milliamps. No problemo.
Where does that current go when it gets inside the ECU? To ground. Big deal.
If you are worried, use a 10k and it will still work. 14v/10k = 1.4 milliamps.
Everything else you are saying is fluff to make you sound smart and sell your adapter.
For you DIYers, use a MOSFET if you want, rated for a few amps and 100v minimum.
Check out the new versions on my site, especially the Interceptor.
11-28-2010, 06:35 AM
#106
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Re: Crazy Tach Needle, Breaking Up, Ignitor or Coil?
New here but not to cars. I can't seem to find the needed info to build the relay. The site is http://www.jandssafeguard.com/index.html right?
My Prelude is running a 6AL and Blaster SS coil and it won't fire. I'm not an electronics person, I'm gathering knowledge slowly on that. Can you guys PLEASE help me out. Thanks!
My Prelude is running a 6AL and Blaster SS coil and it won't fire. I'm not an electronics person, I'm gathering knowledge slowly on that. Can you guys PLEASE help me out. Thanks!
11-30-2010, 11:19 AM
#109
Honda-Tech Member
Re: (pgpbubble)
What is the purpose of the adapter? To drive the Points input wire of an MSD. It doesn't need to be able to blow a 15A fuse.
The MSD Points input has an internal 5 Watt 47 ohm pullup resistor to the battery.
14v/47 ohm = 0.3 amps. The Zetex 857 can handle ten times the current required. Plus it's high voltage so it's protected from transients.
I used the ZTX857 because they can handle the load and was using them as output drivers in my 1ch/2ch version. Plus they have the same foot print as a PN2222.
As to the circuit "pushing current into the ECU", that's how open collector output drivers work. Actually, the ECU driver PULLS current in but I won't flame you for getting it backwards.
Assume the ECU has a garden variety NPN surface mount transistor as the output driver, such as an MMBT2222. It's rated for 0.6 amps, and all we are asking it to do is 14v/1k = 0.014 amps. 14 milliamps. No problemo.
Where does that current go when it gets inside the ECU? To ground. Big deal.
If you are worried, use a 10k and it will still work. 14v/10k = 1.4 milliamps.
Everything else you are saying is fluff to make you sound smart and sell your adapter.
For you DIYers, use a MOSFET if you want, rated for a few amps and 100v minimum.
Check out the new versions on my site, especially the Interceptor.
The MSD Points input has an internal 5 Watt 47 ohm pullup resistor to the battery.
14v/47 ohm = 0.3 amps. The Zetex 857 can handle ten times the current required. Plus it's high voltage so it's protected from transients.
I used the ZTX857 because they can handle the load and was using them as output drivers in my 1ch/2ch version. Plus they have the same foot print as a PN2222.
As to the circuit "pushing current into the ECU", that's how open collector output drivers work. Actually, the ECU driver PULLS current in but I won't flame you for getting it backwards.
Assume the ECU has a garden variety NPN surface mount transistor as the output driver, such as an MMBT2222. It's rated for 0.6 amps, and all we are asking it to do is 14v/1k = 0.014 amps. 14 milliamps. No problemo.
Where does that current go when it gets inside the ECU? To ground. Big deal.
If you are worried, use a 10k and it will still work. 14v/10k = 1.4 milliamps.
Everything else you are saying is fluff to make you sound smart and sell your adapter.
For you DIYers, use a MOSFET if you want, rated for a few amps and 100v minimum.
Check out the new versions on my site, especially the Interceptor.
little bit different of a circut and using a mosfet also using a 4124 instead of the 2222.
fluff huh john? someone **** in your cherrios this morning? =P
Last edited by 2k.civic.si; 11-30-2010 at 11:40 AM.
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