MicroSquit Conversion, Giving this a try |
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MicroSquit Conversion, Giving this a try |
Mblizzard |
Oct 3 2016, 07:18 AM
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#1
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Advanced Member Group: Members Posts: 3,033 Joined: 28-January 13 From: Knoxville Tn Member No.: 15,438 Region Association: South East States |
I am pretty happy with my stock FI. But after seeing some of the setups at Okteenerfest, I thought this might be worth trying.
The stock system is not easy to modify and get things running correctly. I spent a lot of time making minor adjustments by trial and error. While I am not looking for huge HP gains or anything, it is pretty clear that the mods I have could potentially benefit from a bit more precise control. Going to start with fuel only at this point to get things going and see where it leads me. Any help or suggestions for set up would be appreciated. |
Dtjaden |
Oct 7 2016, 02:12 PM
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#2
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Member Group: Members Posts: 232 Joined: 25-May 13 From: Morgan Hill, CA Member No.: 15,915 Region Association: Northern California |
I appreciate all of the intelectual comments. I am afraid they will most likely confuse the OP. If he simply find follows the recommendation in the Megasquirt/Microsquirt manuals all will be good.
By the way 2.0 injectors check out at slightly less than 2.5 ohms when cold. |
N_Jay |
Oct 7 2016, 02:57 PM
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#3
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Member Group: Members Posts: 283 Joined: 2-March 16 From: Chicago NW Burbs Member No.: 19,720 Region Association: None |
I appreciate all of the intelectual comments. I am afraid they will most likely confuse the OP. If he simply find follows the recommendation in the Megasquirt/Microsquirt manuals all will be good. By the way 2.0 injectors check out at slightly less than 2.5 ohms when cold. I see where the manual talks about the resistors slowing down the opening. I am not sure the peak and hold would be as good as building a constant current driver (or is the engineer in me over designing?) Maybe just put a capacitor across the resistor? |
Mark Henry |
Oct 7 2016, 03:57 PM
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#4
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
I appreciate all of the intelectual comments. I am afraid they will most likely confuse the OP. If he simply find follows the recommendation in the Megasquirt/Microsquirt manuals all will be good. By the way 2.0 injectors check out at slightly less than 2.5 ohms when cold. I see where the manual talks about the resistors slowing down the opening. I am not sure the peak and hold would be as good as building a constant current driver (or is the engineer in me over designing?) Maybe just put a capacitor across the resistor? I have a hard time believing that one, the resistor limits current but slowing it down? That's like putting a throttle on light. I've run 2.0 D-jet injectors with no issues, my engine now has Siemens deka 55 lbs low impedance injectors. BTW stock 2.0 injectors can handle 200 hp easy, stock engine you won't be seeing any more than 35% duty cycle. The only issue I see with low impedance is the resistor pack gets hot and needs to be away from things that could melt. If you are making your own resistor pack mount them on a aluminum plate for a heat sink. |
N_Jay |
Oct 8 2016, 07:13 AM
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#5
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Member Group: Members Posts: 283 Joined: 2-March 16 From: Chicago NW Burbs Member No.: 19,720 Region Association: None |
I see where the manual talks about the resistors slowing down the opening. I am not sure the peak and hold would be as good as building a constant current driver (or is the engineer in me over designing?) Maybe just put a capacitor across the resistor? I have a hard time believing that one, the resistor limits current but slowing it down? That's like putting a throttle on light. I've run 2.0 D-jet injectors with no issues, my engine now has Siemens deka 55 lbs low impedance injectors. BTW stock 2.0 injectors can handle 200 hp easy, stock engine you won't be seeing any more than 35% duty cycle. The only issue I see with low impedance is the resistor pack gets hot and needs to be away from things that could melt. If you are making your own resistor pack mount them on a aluminum plate for a heat sink. The difference between resistance and inductance. The injector is a coil, so the resistance is when you measure steady-state (DC) with an Ohm meter. The inductance will be significantly higher, because the coil will resist inrush of current. The greater the impedance of the power supply (The internal resistance of the battery and all resistance prior to the coil), the slower this ramp up of current (and hence the opening of the injector) is. But as I said, probably over engineering. |
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