Freaky Roadster

Yes to Seq' fuel, either run 4 new wires or 2 new and 2 existing on the loom. Don't forget firing order is 1,3,4,2.
Seq' spark is no until you get COPS.

As for MS3 and 3X grounds, I would like piccy's as well please

richyvrlimited

iTrader: (1)

Coils = ignition/spark, not fuel...

You can do sequential fuel as you have 4 injectors.

You can't do sequential spark as you only have 2 coils

Braineack

iTrader: (62)

seq fuel yes, beucase you'd have 1 fuel driver for every injector.

seq. ign. no, becuase you still have 2 coils for 4 clyinders.

Oochi

See that's what I thought so I asked and brain said no so I got all confused, but I suppose he misread or something. Anywho, if I were to run just 2 new wires and keep the other 2 in the original loom, does it matter which wire goes to which injector?


Still in for grounding help pretty please.

Braineack

iTrader: (62)

i did misread.


INJ A - cly 1
INJ B - cly 3
INJ C - cly 4
INJ D - cly 2

Oochi

SO I think I completed the expander harness, and on to the ms harness.....I'm confused on the grounds. The grounds are all interconnected right? So it really doesnt matter where they go as long as you have 5 grounds and the 1 sensor ground? My harness looks like this, the black and white stripe being my sensor ground I suppose but I don't really know how that wires up yet.


And the assembly guide says to run every single ground wire out to the engine, but I don't know why you would need to do that if they make PNP applications. Where do all of these grounds go?

Braineack

iTrader: (62)

you should connect only the two sensor grounds to pins 1-2 (2C 2D). You didn't need to shield the cas input, it's not a shielded wire on the factory side.

main grounds from the db37 will go to pins 2A and 2B.

then ms3x grounds so all go through the main ground 2A and 2B, but preferably through there own grounds directly back to the block.


you need to follow this:

http://msextra.com/doc/ms3/hardware.html




other than the cas sheild wire, the only thing that i notice is the stripe wire on pin 7, what's that supposed to go to?

Oochi

I couldn't find any reference for the black and white strip, so I was just going to use it as another ground. The Diagram has 11 grounds going to the ms connector. Pins 1-2 for sensors, pin 7 for o2 signal ground (which I don't need if I'm using a wideband, correct?), pin 8 for CAS?, pin 9 for tps (which I also don't use), and then pins 14-19 to engine ground (2A & 2B). Which leaves me with 9 grounds needed, though my wire pack only came with 7 ground wires including the shielded one and the black w/ white stripe. Do I need all of these or do I have to use other wires Im not using in place of the grounds?

So I should unshield the twisted pair, use pins 1 & 2 for the sensor grounds (2C & 2D), ground the cas at pin 8. Then connect pins 14-19 to 2A & 2B as in solder 3 of them to 2A and 3 to 2B. Then the 5 grounds from the ms3x go individually out to the block.

Braineack

iTrader: (62)

My personal MS3x is wired as such:

pins 1-2 - 2C & 2D

pins 7-8-9-10 - 2A & 2B (the two splice into 1 before reaching the harness)

ms3x - I have 4 of the 5 grounded (two splice into 1 before reaching harness)

so I have 2 pairs of wires on 2A&2B and 1 wire on 2C and 2D each.



If you need to run extra wires to the bay for seq spark and fuel outputs, that would be a good time to run a few grounds to main grounding point on the block (fuel rail). Then I'd connect the 4 ms3x grounds directly to that.



this is not the "ideal" way to wire it, but it works.

Oochi

is there a reason you only grounded 4 and not all 5 on the ms3x? Where are they grounded?

and do you not need all the grounds on the main connector?

Oochi

A few more things I would like cleared up, using this diagram (my car is a 90)


The launch control from the ms3x (pin 11) will work for the clutch switch instead of using one from the ms connector?

I may be missing it on the wiring diagrams but where does the cam input from the ms3x go to the harness?

Does the datalog input (pin30) want the datalog from the wideband? (may be a stupid question)

Does the tach output (pin 26 of ms3x) go to pin 2i?

Should I splice In the wideband signal into the stock harness at pin 2N?

Thanks in advance. I know it's a lot to ask. And sorry if obvious answers, I need sleep.

Braineack

iTrader: (62)

yes, that's what it's for.


the blue/white wire will go the cam in on the ms3x instead of pin25 on the db37.

no, this can be used for any low-input. For example, you could use it for launch control triggering instead of the other pin mentioned above. it's original intent was to be wired to a switch so you could start a datalog on the SD drive manually.

no, you dont use tachout on a 90-94.

you can, depends where you wire the controller. Mine's behind the radio so it makes more sense to wire directly to the harness and not hack up sotck wiring.

I feel sad that I built a ms3x for a 1990 in just a few short hours over the weekend and you've been going on how long?

Oochi

Well, college took over my life for a few months and never got to work on it, not to mention im a total when it comes to this and you're way more experienced and knowledgeable than I.

But thanks for the answers, though on my cas stuff; my wire is not blue/white, it's solid green and says cam input. And I used the white wire of the twisted pair to the other cas on pin 2E, but it's smaller than the other 20 gauge wires, will that be a problem? I here that others are thick grey?

Braineack

iTrader: (62)

that diagram was drawn back when i was building MSIs.


when you remove the shield it's the same size as the rest. that will go to pin 2E on the mainboard db37.

the cam in wire on the ms3x (pin 32) will go to 2G.


youll build the VR circuit with pull up on the mainboard. youll tune the resistors as in the manual for that mod (both 12 counter clockwise, then r56 6 turns clockwise)



youll use rising edge input on the software. couldnt be easier...its pisses me off how easy the ms3x is to build. you only have to run 2 extra wires like that above...that's it. everything else is all built in on the expander card that youll ever really need.



here use my basemap....this is setup for toyota cops right now:

WestfieldMX5

You could even install the resistor in the left hole of R13 (= 5V) and the right side of R45 just below it (= VRIN)

Braineack

iTrader: (62)

yeah, I was too lazy to think.

Oochi

Will that be same some outcome as what brain posted without the wires? I do think I've already done that but I'll check again. I was reading through this thread: http://clubroadster.net/vb_forum/showthread.php?t=41736 and just remembered I never did the fuel pump mod on my board. slapintheface

Braineack

iTrader: (62)

What mod? You just install q2 q12 d5 r49 and r16 iirc.



Im sitting on the beach posting...just finish this thing man. Thers only two wires to add to the mainboard the rest is all ready on the expander. Just build the harness and be done and drive and enjoy.

Oochi

Fuel pump mod, that thread the guy also has a 90 and was building ms3x, the guy did the fuel pump mod, but I think I just was confused because you can just jump the AFM

I am doing my best lol. For the VR circuit I followed westfield's directions:
Won't that be the same as the longer wire on your picture above?

WestfieldMX5

yes, that is the same as the longer wire.