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> MicroSquit Conversion, Giving this a try
Mblizzard
post Oct 3 2016, 07:18 AM
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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.
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Mblizzard
post Oct 7 2016, 09:59 AM
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Ok let’s be clear. I am not no wiring expert! But as I understand things the micro squirt controls the injectors by providing ground. Meaning the controller switches ground on an off as needed to fire the injectors. Because I have low impedance injectors I have to use resistors. Below is the guidance from the manual on how to wire.

Attached Image

Based on this it shows the resistors on the controller side which is ground. (IMG:style_emoticons/default/WTF.gif)

This can’t be correct can it? Especially when it stats than an individual resistor is required for each injector.

The resistors have to go on the 12v wire don't they?
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N_Jay
post Oct 7 2016, 10:03 AM
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QUOTE(Mblizzard @ Oct 7 2016, 10:59 AM) *

Ok let’s be clear. I am not no wiring expert! But as I understand things the micro squirt controls the injectors by providing ground. Meaning the controller switches ground on an off as needed to fire the injectors. Because I have low impedance injectors I have to use resistors. Below is the guidance from the manual on how to wire.

Attached Image

Based on this it shows the resistors on the controller side which is ground. (IMG:style_emoticons/default/WTF.gif)

This can’t be correct can it? Especially when it stats than an individual resistor is required for each injector.

The resistors have to go on the 12v wire don't they?



The order of devices in series is immaterial.

Question, how much voltage and current at are the injectors designed for?
What is the current the MS is designed to sink?
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Mblizzard
post Oct 7 2016, 11:32 AM
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QUOTE(N_Jay @ Oct 7 2016, 08:03 AM) *

QUOTE(Mblizzard @ Oct 7 2016, 10:59 AM) *

Ok let’s be clear. I am not no wiring expert! But as I understand things the micro squirt controls the injectors by providing ground. Meaning the controller switches ground on an off as needed to fire the injectors. Because I have low impedance injectors I have to use resistors. Below is the guidance from the manual on how to wire.

Based on this it shows the resistors on the controller side which is ground. (IMG:style_emoticons/default/WTF.gif)

This can’t be correct can it? Especially when it stats than an individual resistor is required for each injector.

The resistors have to go on the 12v wire don't they?



The order of devices in series is immaterial.

Question, how much voltage and current at are the injectors designed for?
What is the current the MS is designed to sink?


Lets say the injector resistance is around 2.5 Ohms and I am adding another 3 Ohms so that would be about 2 amps based on 12V.

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N_Jay
post Oct 7 2016, 11:46 AM
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QUOTE(Mblizzard @ Oct 7 2016, 12:32 PM) *

QUOTE(N_Jay @ Oct 7 2016, 08:03 AM) *

QUOTE(Mblizzard @ Oct 7 2016, 10:59 AM) *

Ok let’s be clear. I am not no wiring expert! But as I understand things the micro squirt controls the injectors by providing ground. Meaning the controller switches ground on an off as needed to fire the injectors. Because I have low impedance injectors I have to use resistors. Below is the guidance from the manual on how to wire.

Based on this it shows the resistors on the controller side which is ground. (IMG:style_emoticons/default/WTF.gif)

This can’t be correct can it? Especially when it stats than an individual resistor is required for each injector.

The resistors have to go on the 12v wire don't they?



The order of devices in series is immaterial.

Question, how much voltage and current at are the injectors designed for?
What is the current the MS is designed to sink?


Lets say the injector resistance is around 2.5 Ohms and I am adding another 3 Ohms so that would be about 2 amps based on 12V.

So are they looking for 2A at about 6V?

Does anyone have the actual specs?
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Dtjaden
post Oct 7 2016, 12:28 PM
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QUOTE(N_Jay @ Oct 7 2016, 10:46 AM) *

QUOTE(Mblizzard @ Oct 7 2016, 12:32 PM) *

QUOTE(N_Jay @ Oct 7 2016, 08:03 AM) *

QUOTE(Mblizzard @ Oct 7 2016, 10:59 AM) *

Ok let’s be clear. I am not no wiring expert! But as I understand things the micro squirt controls the injectors by providing ground. Meaning the controller switches ground on an off as needed to fire the injectors. Because I have low impedance injectors I have to use resistors. Below is the guidance from the manual on how to wire.

Based on this it shows the resistors on the controller side which is ground. (IMG:style_emoticons/default/WTF.gif)

This can’t be correct can it? Especially when it stats than an individual resistor is required for each injector.

The resistors have to go on the 12v wire don't they?



The order of devices in series is immaterial.

Question, how much voltage and current at are the injectors designed for?
What is the current the MS is designed to sink?


Lets say the injector resistance is around 2.5 Ohms and I am adding another 3 Ohms so that would be about 2 amps based on 12V.

So are they looking for 2A at about 6V?

Does anyone have the actual specs?

The specs are clearly stated in the appropriate Megasquirt manual, MS2V3 Hardware Manual.
http://www.msextra.com/doc/pdf/MS2V30_Hardware-3.4.pdf
While the specification is 7 amps at 12V (6 volts does not come into this at all) per channel for the output transistors they don't want to drive them at full rating. The manual clearly states the resistor values (both resistance and wattage) and has a wiring pictogram.

As was stated earlier the resistor could be on either side of the injector although their diagram shows the resister installed between the injector and the MS controller. The controller does pull the injector lines to ground. With the resistor values suggested by the Megasquirt manual the current is kept under 2 amps.

Microsquirt is electrically a Megasquirt II version 3
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N_Jay
post Oct 7 2016, 01:19 PM
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QUOTE(Dtjaden @ Oct 7 2016, 01:28 PM) *

QUOTE(N_Jay @ Oct 7 2016, 10:46 AM) *

QUOTE(Mblizzard @ Oct 7 2016, 12:32 PM) *

QUOTE(N_Jay @ Oct 7 2016, 08:03 AM) *

QUOTE(Mblizzard @ Oct 7 2016, 10:59 AM) *

Ok let’s be clear. I am not no wiring expert! But as I understand things the micro squirt controls the injectors by providing ground. Meaning the controller switches ground on an off as needed to fire the injectors. Because I have low impedance injectors I have to use resistors. Below is the guidance from the manual on how to wire.

Based on this it shows the resistors on the controller side which is ground. (IMG:style_emoticons/default/WTF.gif)

This can’t be correct can it? Especially when it stats than an individual resistor is required for each injector.

The resistors have to go on the 12v wire don't they?



The order of devices in series is immaterial.

Question, how much voltage and current at are the injectors designed for?
What is the current the MS is designed to sink?


Lets say the injector resistance is around 2.5 Ohms and I am adding another 3 Ohms so that would be about 2 amps based on 12V.

So are they looking for 2A at about 6V?

Does anyone have the actual specs?

The specs are clearly stated in the appropriate Megasquirt manual, MS2V3 Hardware Manual.
http://www.msextra.com/doc/pdf/MS2V30_Hardware-3.4.pdf
While the specification is 7 amps at 12V (6 volts does not come into this at all) per channel for the output transistors they don't want to drive them at full rating. The manual clearly states the resistor values (both resistance and wattage) and has a wiring pictogram.

As was stated earlier the resistor could be on either side of the injector although their diagram shows the resister installed between the injector and the MS controller. The controller does pull the injector lines to ground. With the resistor values suggested by the Megasquirt manual the current is kept under 2 amps.

Microsquirt is electrically a Megasquirt II version 3


I was wondering about the specs on the injectors not the MS.

If you put 13.8v across a 3 ohm resistor in series with a 2.5 ohm injector (we really need the impedance not resistance here) the injector will see about 6.25 V and about 2.5 A

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Posts in this topic
Mblizzard   MicroSquit Conversion   Oct 3 2016, 07:18 AM
76-914   :popcorn:   Oct 3 2016, 07:35 AM
GregAmy   I've been giving this a lot of thought. I...   Oct 3 2016, 08:01 AM
Mblizzard   I've been giving this a lot of thought. I...   Oct 3 2016, 08:08 AM
McMark   I have all the pieces I used on my car. Working o...   Oct 3 2016, 08:03 AM
Mblizzard   I have all the pieces I used on my car. Working ...   Oct 3 2016, 08:05 AM
McMark   :P Done!   Oct 3 2016, 08:07 AM
GregAmy   It will be easy to self wire. However, if you want...   Oct 3 2016, 08:18 AM
Mblizzard   It will be easy to self wire. However, if you wan...   Oct 3 2016, 08:38 AM
plays with cars   Mike, I think you're concern is justified abou...   Oct 3 2016, 09:34 AM
Mblizzard   Still asking questions. A number of people have c...   Oct 3 2016, 11:15 AM
jcd914   Still asking questions. A number of people have ...   Oct 3 2016, 04:50 PM
cgnj   Hi, I thought about about all of these issues whi...   Oct 4 2016, 04:30 AM
Mblizzard   Hi, I thought about about all of these issues wh...   Oct 4 2016, 06:05 AM
JamesM   All sorts of cool stuff http://www.thedubshop.net...   Oct 3 2016, 11:53 AM
jd74914   Does the Dakota CHT gauge have any analog (voltage...   Oct 4 2016, 06:19 AM
Mblizzard   Does the Dakota CHT gauge have any analog (voltag...   Oct 4 2016, 11:01 AM
McMark   CHT Group Buy from Mark Whitesell Never had a gro...   Oct 4 2016, 07:16 AM
Mblizzard   CHT Group Buy from Mark Whitesell Never had a gr...   Oct 4 2016, 08:18 AM
Mark Henry   If you use the stock 914 injectors (low impedance)...   Oct 4 2016, 03:20 PM
Mblizzard   If you use the stock 914 injectors (low impedance...   Oct 4 2016, 05:36 PM
Dtjaden   Some comments on my 2 year journey with Megasquirt...   Oct 4 2016, 05:44 PM
Porschef   By the way, on the drive to Medford and back I ...   Oct 4 2016, 07:13 PM
Dtjaden   I think you could contact Mario at the DubShop or ...   Oct 4 2016, 08:38 PM
Mblizzard   Some comments on my 2 year journey with Megasquir...   Oct 5 2016, 07:48 AM
Dtjaden   The DubShop CHT sensor is installed under one of t...   Oct 5 2016, 09:10 AM
Mblizzard   The DubShop CHT sensor is installed under one of ...   Oct 5 2016, 09:40 AM
JamesM   [quote name='Dtjaden' post='2407555' date='Oct 5 ...   Oct 7 2016, 02:17 PM
jd74914   Hoping to not go the crank trigger rout because I...   Oct 5 2016, 10:21 AM
Mblizzard   Hoping to not go the crank trigger rout because ...   Oct 5 2016, 10:58 AM
cgnj   [quote name='jd74914' post='2407580' date='Oct 5 ...   Oct 5 2016, 11:35 AM
N_Jay   . . . .Crank position sensor in distributor will...   Oct 5 2016, 12:11 PM
Mblizzard   Hoping to not go the crank trigger rout because ...   Oct 5 2016, 11:01 AM
Mueller   [quote name='Mblizzard' post='2407513' date='Oct ...   Oct 6 2016, 10:51 AM
Mblizzard   [quote name='Mblizzard' post='2407513' date='Oct...   Oct 6 2016, 11:25 AM
cgnj   9. I mounted the Megasquirt (not Microsquirt) in...   Oct 5 2016, 11:44 AM
porsche913b_sp   :popcorn:   Oct 4 2016, 06:18 PM
jd74914   Oops, just read your more recent post and saw that...   Oct 5 2016, 10:30 AM
Mark Henry   Oops, just read your more recent post and saw tha...   Oct 5 2016, 12:48 PM
Mblizzard   Oops, just read your more recent post and saw th...   Oct 5 2016, 01:13 PM
cgnj   This is the Dubshop cam position sensor $155....   Oct 5 2016, 02:04 PM
Mblizzard   This is the Dubshop cam position sensor $155...   Oct 5 2016, 02:27 PM
Dtjaden   [quote name='cgnj' post='2407689' date='Oct 5 201...   Oct 5 2016, 03:52 PM
Mark Henry   Yep, I'm just saying don't get hung up on ...   Oct 5 2016, 01:20 PM
Mblizzard   First box of goodies!   Oct 5 2016, 04:49 PM
Dtjaden   For anyone looking for a packaged solution for und...   Oct 5 2016, 11:33 PM
McMark   I don't think MicroSquirt does sequential inje...   Oct 6 2016, 07:37 AM
Mblizzard   I don't think MicroSquirt does sequential inj...   Oct 6 2016, 10:38 AM
aircooledtechguy   I own, run and have installed virtually every prod...   Oct 6 2016, 10:40 PM
Dtjaden   I own, run and have installed virtually every pro...   Oct 6 2016, 10:53 PM
Mblizzard   I own, run and have installed virtually every pro...   Oct 7 2016, 08:43 AM
N_Jay   I think the crank trigger would be better as well...   Oct 7 2016, 08:57 AM
Mblizzard   I think the crank trigger would be better as wel...   Oct 7 2016, 09:10 AM
cgnj   [quote name='N_Jay' post='2408476' date='Oct 7 20...   Oct 7 2016, 10:03 AM
cgnj   I think the crank trigger would be better as wel...   Oct 7 2016, 10:13 AM
Java2570   I've been talking to Mario @ Dubshop about doi...   Oct 7 2016, 07:44 AM
Mblizzard   Ok let’s be clear. I am not no wiring expert...   Oct 7 2016, 09:59 AM
N_Jay   Ok let’s be clear. I am not no wiring expert...   Oct 7 2016, 10:03 AM
Mblizzard   Ok let’s be clear. I am not no wiring expert...   Oct 7 2016, 11:32 AM
N_Jay   [quote name='N_Jay' post='2408496' date='Oct 7 20...   Oct 7 2016, 11:46 AM
Dtjaden   [quote name='Mblizzard' post='2408534' date='Oct ...   Oct 7 2016, 12:28 PM
N_Jay   [quote name='Mblizzard' post='2408534' date='Oct...   Oct 7 2016, 01:19 PM
Dtjaden   The crankshaft trigger wheel, either the DubShop...   Oct 7 2016, 11:13 AM
N_Jay   Maybe I am not picturing it correctly, but how doe...   Oct 7 2016, 11:20 AM
jd74914   Maybe I am not picturing it correctly, but how do...   Oct 7 2016, 11:26 AM
Mblizzard   Maybe I am not picturing it correctly, but how d...   Oct 7 2016, 11:31 AM
N_Jay   Maybe I am not picturing it correctly, but how d...   Oct 7 2016, 11:59 AM
cgnj   Maybe I am not picturing it correctly, but how do...   Oct 7 2016, 11:59 AM
jcd914   From a MegaSquirt manual: "Injectors are eith...   Oct 7 2016, 01:24 PM
Mblizzard   From a MegaSquirt manual: "Injectors are eit...   Oct 7 2016, 04:12 PM
Dtjaden   I appreciate all of the intelectual comments. I am...   Oct 7 2016, 02:12 PM
N_Jay   I appreciate all of the intelectual comments. I a...   Oct 7 2016, 02:57 PM
Mark Henry   I appreciate all of the intelectual comments. I ...   Oct 7 2016, 03:57 PM
N_Jay   I see where the manual talks about the resistors...   Oct 8 2016, 07:13 AM
Dtjaden   I appreciate all of the intelectual comments. I ...   Oct 7 2016, 05:10 PM
N_Jay   [quote name='N_Jay' post='2408588' date='Oct 7 20...   Oct 8 2016, 07:20 AM
Mblizzard   I appreciate all of the intelectual comments. I a...   Oct 7 2016, 04:54 PM
Dtjaden   I appreciate all of the intelectual comments. I ...   Oct 7 2016, 05:11 PM
Mblizzard   [quote name='Mblizzard' post='2408640' date='Oct ...   Oct 7 2016, 05:25 PM
Mblizzard   [quote name='Mblizzard' post='2408640' date='Oct...   Oct 8 2016, 06:41 AM
N_Jay   Ok still thinking about the placement of the res...   Oct 8 2016, 07:30 AM
Dtjaden   Blizzard - what are you doing for A/C on your car....   Oct 7 2016, 05:13 PM
Mblizzard   Blizzard - what are you doing for A/C on your car...   Oct 7 2016, 05:28 PM
Phoenix914   Since my engine is out, I'm thinking it would ...   Oct 8 2016, 08:37 AM
stugray   Since my engine is out, I'm thinking it would...   Oct 8 2016, 09:15 AM
Dtjaden   Since my engine is out, I'm thinking it woul...   Oct 8 2016, 09:31 AM
N_Jay   And having a capacitor installed across the coi...   Oct 8 2016, 01:12 PM
Phoenix914   Since my engine is out, I'm thinking it woul...   Oct 8 2016, 01:17 PM
Mark Henry   You guys are really over thinking this stuff....   Oct 8 2016, 09:19 AM
stugray   You guys are really over thinking this stuff.... ...   Oct 8 2016, 09:31 AM
Dtjaden   Good Job. I used to take my 914 on long trips re...   Oct 8 2016, 09:29 AM
McMark   Seriously. Low impedance injectors need a resisto...   Oct 8 2016, 10:56 AM
Mblizzard   Seriously. Low impedance injectors need a resist...   Oct 8 2016, 01:10 PM
Mblizzard   I know some of the discussion may seem trivial to ...   Oct 8 2016, 01:10 PM
jcd914   I know some of the discussion may seem trivial to...   Oct 8 2016, 03:08 PM
cgnj   Hi, waited till I had something of value to add.Gr...   Oct 10 2016, 11:50 AM
Mblizzard   Hi, waited till I had something of value to add.G...   Oct 10 2016, 12:23 PM
N_Jay   Is anyone using a MAF sensor or an O2 sensor with ...   Oct 10 2016, 04:54 PM
Mueller   Is anyone using a MAF sensor or an O2 sensor with...   Oct 10 2016, 10:04 PM
jd74914   [quote name='N_Jay' post='2409688' date='Oct 10 2...   Oct 11 2016, 05:57 AM
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