I'm completely lost.

[himself]

This MS system has me frustrated, nothing is making sense with the wiring. Why did I have to buy a 6 wire tps switch and it only tells me to use 3 wires? Now that my ecu is out what controls my gauges, my starter, and other things the MS doesn't, where does the air intake sensor go? What else has to be removed to get the rest of this stuff in place besides the old TB, all the vaccuum lines, the air regulator, and how to do plug it all up?

I know this thing isn't plug and play but the hardware modifications to the engine alone are going to take me weeks to complete, custom manifold, TB adapter, custom air intake line, plugging vaccuum lines, plugging coolant lines and all this before I can get to the wiring.

 

This is the MS system I purchased:

MS130-C $330 Assembled Megasquirt-I with V3.0 PCB

MOD_130IGBT1: Single Ignition Output through IGBT (VB921) $20

MSHarness $65 12' wiring harness

IATwPiggy $21 IAT Sensor

38NPT-Bung_S $8 Bung for mounting IAT sensor (steel weld on, or JB-Weld on)

TuneCable $6 6' DB9 tuning cable

USB-2920 $20 (Only needed if your laptop doesn’t have a true DB9 port)

WB-LC1-3769 $199 Innovate LC-1 system

 

I have a 1975 280z with a completely stock '82 280zx turbo motor. I started this project only to get rid of the AFM since I go through one AFM every year. They burn out way to fast to keep replacing them.

 

There must be something I'm either not seeing or doing wrong because this is taking far, far longer than anyone else has done it in and I haven't plugged a single wire in yet. Would it have been best just to get the SDS system since with all these new modifications I've spent more on the MS than the SDS system would've cost me in both time and money?

 

Is there anyone in the Sacramento area who can take a quick look one weekend or another and point out where to start and go from there?

[bryan01]

see red

 

This MS system has me frustrated, nothing is making sense with the wiring. Why did I have to buy a 6 wire tps switch and it only tells me to use 3 wires?i'm not sure what you bought, but all you have to do is wire into the tps that's on the throttle body. there's a sender wire, power wire, and ground. my MS is actually wired so i only have to tap into the sender wire, and it references a ground so it can calculate the difference, ie how open the throttle is. Now that my ecu is out what controls my gauges, my starter, and other things the MS doesn't nothing. if you pulled your stock ECU nothing controls them, you have to wire them directly to the sensor they read and hope there was no voltage drop across the computer (resistors etc) that enabled the gauge to read. i have my MS setup for fuel only. my stock computer is still in the car controlling the spark, and if i had gauges, they would also still be hooked up thru the stock computer. even if i had my MS controlling fuel and spark, if i had the stock gauges in there i'd have the stock ecu wired in to them and to the car. , where does the air intake sensor go? drill a hole in an air tube close to the throttle body. you will either have to weld a bung in if it's a metal pipe, or do what i did, and drill the hole so tight that you can thread the sensor in and seal it w/ some RTV. if it's a plastic pipe that you are trying "tap" into you may have to do what i did, which is a little ghetto but works great, since you obviously cant weld a bung in. What else has to be removed to get the rest of this stuff in place besides the old TB, all the vaccuum lines, the air regulator, and how to do plug it all up? i have all my stock vac lines still connected. i have an idle air control that bypasses the TB which is connected to the stock ECU. i think the MS can also control this, but since i left my stock ECU i figured it was just easier to leave it controlling the IAC than rewiring it to the MS and having another parameter to adjust later.

I know this thing isn't plug and play but the hardware modifications to the engine alone are going to take me weeks to complete, custom manifold, you dont need a custom plenum to run a MS. you just have to tap off a vac line in order to hook up the map sensor, that's the only thing that really has to do w/ the intake manifold plenum (i assume thats what you mean by "manifold" TB adapter did you put a new TB on that needed an adapter to attach to your plenum? if so that's independent of the MS and is just a modification you wanted to make. the MS doesnt care what TB is on there as long as it's 5v which i think most of them are. , custom air intake line,again, why did you do this? in order to tap into with your IAT sensor? if so that's not too hard, just cut the plastic pipe, band clap in the metal pipe, and tap the sensor into it ... it's waht everyone does (more or less) to get their IAT sensor into the air stream plugging vaccuum lines, ? plugging coolant lines and all this before I can get to the wiring.?

 

This is the MS system I purchased:

MS130-C $330 Assembled Megasquirt-I with V3.0 PCB

MOD_130IGBT1: Single Ignition Output through IGBT (VB921) $20

MSHarness $65 12' wiring harness

IATwPiggy $21 IAT Sensor

38NPT-Bung_S $8 Bung for mounting IAT sensor (steel weld on, or JB-Weld on)

TuneCable $6 6' DB9 tuning cable

USB-2920 $20 (Only needed if your laptop doesn’t have a true DB9 port)

WB-LC1-3769 $199 Innovate LC-1 system

 

I have a 1975 280z with a completely stock '82 280zx turbo motor. I started this project only to get rid of the AFM since I go through one AFM every year. They burn out way to fast to keep replacing them.

 

There must be something I'm either not seeing or doing wrong because this is taking far, far longer than anyone else has done it in and I haven't plugged a single wire in yet. Would it have been best just to get the SDS system since with all these new modifications I've spent more on the MS than the SDS system would've cost me in both time and money?

 

Is there anyone in the Sacramento area who can take a quick look one weekend or another and point out where to start and go from there?

[himself]

Thx for the reply, that IAT sensor part was very helpful.

I got a 240sx tps switch as advised by the DIY guys and it has the standard 3 pole plug in the top but also another 3 wires coming out of the witch to another plug. Took a couple hours but after research found out that they both do essentially the same thing but one is far more precise than the other and used that one.

I was able to reuse the 280zx TB and rig up a way to mount the 240sx tps so that I do not have to replace the manifold intake or adapt the 240sx TB onto the manfold. Was rather simple, just wish I'd had the idea cross my mind 6 hours ago.

 

Does the map sensor have a spot already setup to plug in or will I have to make one like the IAT sensor? Now that I think about it did I get a map sensor with the MS or did the car already have one? I do not remember seeing it in the packaging.

[himself]

Back to the IAT sensor, at the top of the manifold there is a vacuum controller that looks about the same thread type and size of the IAT, can i remove it and put the IAT in its place?

[ZR8ED]

Whoa! I'm curious about the iat sensor placement as well. My intake manifold has several now unused threaded ports..hmm is it ok to measure the temp after the throttle body?

 

Not trying to hijack your thread, but I'm only a few hours behind you (install wise)

 

Any thoughts?

 

Scott.

[BRAAP]

The IAT can be placed anywhere in the intake tract, from the air cleaner to as close to the intake valve as you can get it. Where is the the best location? Well, that is ongoing debate and each theory on where is best has its merit, but honestly, anyhwere in the intake tract will get the engie running and be drivable. I personally feel closer to the throttle valve is better due to heat seak issues of the non crossflow head design, but this just my opinion.

 

Read this thread. It covers IAT placement pretty indepth..

 

http://forums.hybridz.org/showthread.php?t=115937

[randy 77zt]

himself-your in sac?if you come down to modesto i can show you some things on my 77 turbo.ms is a lot of work-to support the ms i rebuilt my fuel supply system,moved the battery(gell cell in back).most of the vacuem lines and junk on the motor gets tossed.best to use n42 intake.i have 2 years degree in electronics,ase master certified auto technician and find ms kind of a pain but i didnt want to spend the bucks for a manufactured system.but running back and forth reading web pages to figure out problems vs.having the info shipped with the ecm gets tiring-assuming the tech info shipped with a maunfactured ecm is correct.you will need some kind of wide band o2 system to get it tuned correctly.next is to figure out how work the ms config files.i am not a soft ware genius so working with these files took me many hours to figure out.the wiring is easy-throw out old nissan junk and start over.at this time i am trying to get the megalog viewer program to work so that it generates a corrected fuel map.the datalogs are spit out in excel-not user friendly for a non computor geek.my car runs as a daily driver but it is in a tuning stage at this time.

[himself]

Sac was more of a reference as to where I am since no one know where Latrobe is. I'm halfway between Sac and Placerville, Modesto is a very long drive for me but thank you for offering. Can you post some pictures of your engine though? Location o sensors and where you ran the wires would be great to see.

 

ZR8ED I'm not sure which year engine you have but I did find on the '82 zxt I have there is a vacuum control sensor located in the 4rth intake tube from the front of the engine. You will have to use a metal saw or grinder to cut off the top of the sensor to get to the bolt so you can unscrew it but the IAT sensor fits in its place perfectly. That way you don't have to drill a new hole.