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. |
Mblizzard |
Oct 7 2016, 04:54 PM
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#3
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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 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. Spot on. measure 4 tonight. All between 2.5 and 2.6. |
Dtjaden |
Oct 7 2016, 05:11 PM
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#4
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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. Spot on. measure 4 tonight. All between 2.5 and 2.6. So all you need to do is use 4.7 ohm resistors as specified in the Megasquirt/Microsquirt documentation. |
Mblizzard |
Oct 7 2016, 05:25 PM
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#5
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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 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. Spot on. measure 4 tonight. All between 2.5 and 2.6. So all you need to do is use 4.7 ohm resistors as specified in the Megasquirt/Microsquirt documentation. Glad I just got in a set of 3 ohm resistors! Guess I will be buyin more! |
Mblizzard |
Oct 8 2016, 06:41 AM
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#6
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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 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. Spot on. measure 4 tonight. All between 2.5 and 2.6. So all you need to do is use 4.7 ohm resistors as specified in the Megasquirt/Microsquirt documentation. Glad I just got in a set of 3 ohm resistors! Guess I will be buyin more! Ok still thinking about the placement of the resistors. Because the ground is common to both the injectors and they essentially fire at the same time would there not be another 2.5 Ohms of resistance in the circuit? If so, placing the resistor in the location shown would make more sense as the 3 Ohm recommend by the DIYautotune would give the needed resistance. |
N_Jay |
Oct 8 2016, 07:30 AM
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#7
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Member Group: Members Posts: 283 Joined: 2-March 16 From: Chicago NW Burbs Member No.: 19,720 Region Association: None |
Ok still thinking about the placement of the resistors. Because the ground is common to both the injectors and they essentially fire at the same time would there not be another 2.5 Ohms of resistance in the circuit? If so, placing the resistor in the location shown would make more sense as the 3 Ohm recommend by the DIYautotune would give the needed resistance. The order of the resistor and the injector in the flow of current between the source (the battery switched by the "Fuel Pump" relay) and the return path (Provided by the injector "output" of the MS unit) does not matter. The resistor limits the current flow to an amount that the injector can handle given the highest duty cycle expected. (Plus some margin) Thinking of one side as "Grounded" rather then just a return connection can add confusion. |
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