sideways-FC

ok guys I just looked at everything I need to buy 2 get my car running after I get the moter built and Im definatly not going to have enough money to get a haltech sprint re like I had origanaly plaind. so now I think I am going 2 have to go with an unassembuled ms3 and solder it all together and all that good stuff,or an assembuled ms2 that im shure I would have to mod to work for my application but I am probably going to need some help here and there! this is going to be my first time doing anything like this so please bear with me. um first off can any one tell me what exactly I will have to order from diy autotune.com, coz from what I have read or heard about the ms3 is that its basicly ready to work with the rotarys setup as is? I will be using the stock cas and coil packs. and the kit comes instructions on soldering the whole thing together right?and im geussing if I when with ms2 I would have to use the zeal daughter bord?

Aaron Cake

iTrader: (1)

If you are buying the Megasquirt with the primary goal of saving money, then it's always been my opinion that another ECU should be considered. For one, you're really not going to save that much money over an entry level Haltech, especially if you are willing to consider buying one used. Second, unless you are keenly interested in learning EFI and have some soldering skills, then you may end up with a very frustrating experience and just end up junking the whole thing anyway.

Now that said, I'd recommend MS3 w/MS3x because it's about as plug and play as it gets. Plus the advantages are numerous, with one of the biggest being sequential injection.

You'd need: MS3, MS3X daughtercard, MS harness, MS3X harness, IAT and CLT sensors w/pigtails.

If you do go MS2, then the assembled ECU with the surface mount 3.57 board isn't much more than the MSII unassembled kit. The 3.57 is the most up to date MS board and is easier to work with and configure than the older board. It doesn't require the addition of ignition pullup resistors for example, just a jumper change. As you suspect, the Zeal daughtercard is the easiest way to get the 2nd VR circuit.

So for MS2, you'd need: MS v3 board kit or assembled V3.57 board, MS2 daughtercard, Zeal kit, MS harness, CLT and IAT sensors with pigtails.

sideways-FC

I think I might go with the assembuled ms2 v3.57 and go with the un assembuled zeal daughter board. coz I need to keep the cost of the ecu around 500-600 bucks. and I dont mind doing a little soldering. coz assembuling the zeal and installing it dosnt look like suck a difficalt task I mean it comes with everything I need and the instructions dont seem to hard to understand. does the daughter card come with the ecu? and what is it for? and should I get a stim?

sideways-FC

does the zeal daughter board take place of the v3.57 daughter board I geuss you call it? or will I be using both the raguler v3.57 daughter board and the zeal daughter board?

muythaibxr

The Zeal board must be used with the 3.57 board. It does not take the place of anything; it adds functionality (2nd trigger conditioner and some extra relay driver circuits.

Ken

sideways-FC

k thats good to know! um I geuss I will be ordering all this stuff in like a week or 2 when I get the money. now with the zeal daughter board what pins would I be using on the ms wireing harness for my two vr inputs for the cas, 3 on off out puts, and tach out put? a wireing diagram would be very helpful.

muythaibxr

You can use either DIYAutotune's howto or Aaron Cake's howto to do that. Both work, but if you pick one, stick with it... don't mix up DIYAutotune's and Aaron Cake's.

Ken

sideways-FC

I have been emailing diyauto tune about it and they sent me a link to a page that told me a whole bunch about the zeal daughter board and what pins are for what. um I cant think of any more questions right now. I spent like a whole night sun down to sun up almost! reading about the maga squirt and the zeal and all that good stuff. but im shure I will have some more questions when I start building and instaling the zeal so stay subsribed lol!

sideways-FC

ok I just orderd the maga squirt and the zeal so I geuss im going to get started building the zeal 2night or 2maro. but were and how am I sapost to mount it? i mean I would think I would mount it in the grooves in the upper part of the case but its just a hair to big to fit. were and how do I mount it?

sideways-FC

ok i got it to fit in the case so i know how it mounts now. and built the zeal last night. i just have one question it dosent specifie that the resisters needed to be installed in any direction. I dont think resisters are directional are they? and I want to go with a full range tps and I couldnt find any on diyautotune.com. so weres a good place to find a tps and I need to find out how to mount it to.

13bdarren

the s5 tps has a full range I beleive.

sideways-FC

well i dont have any tps right now and i figure ill just buy a gm tps or somthing like that. now i have the zeal built and im working on makeing all the daughter board to main board connections and im haveing trouble finding a few of them. I cant seem to find JS10, JS11,out1,and i dont know where the proto GND is every GND on the main bourd it just labled GND. and I geuss the one row of pads along the bottem left of the board is pads1-5 and the longer row of pads to the top left of those pads is pads6-17?

sideways-FC

ok i did some more reading in the maga manule I geuss JS10 and JS11 are both one of the 40 pins of the 3.57 daughter board? so could I just run the wires from VR2OUT and IN1 from the zeal through the main board and solder the wires to those pins from the 3.57 daughter board under the main board? how do I tell wich VR2 hole is + and wich one is - on the zeal daughterboard? and is the proto GND the the to holes next to the boot jumper to the left of the 3.57 daughterboard/daughter card?

Aaron Cake

iTrader: (1)

Resistors are non-directional.

Any GM or Ford TPS that will fit. '90s Mustang, etc.

If you are looking at the board with the DB37 on the right, then JS10 and JS11 are at the top right of the processor socket.

The Zeal instructions tell you which outputs on the Zeal go where:
Assembling the Zeal Engineering Daughterboard for MegaSquirt

sideways-FC

so can I just solder the wires to those points on the top of the daughter board socket on top of the daughter board? or should I run them to the bottem of the mainboard and solder to the bottem of the daughter board socket? and I read the link on the zeal you put up I couldnt find any thing about the vr2 holes, might have mist it. but it did say that the top hole of the VR1 is the + and the bottem is the -. are the VR2 holes the same way?

sideways-FC

just read over that link again a little closer, and it said the lower hole is the + and the upper is the - hole.

sideways-FC

in the schimatic in the maga manule it says pins 17 and 18 are JS10 and JS11. when you say when looking at it with the DB37 on the right do you mean if im looking at it from the top side or the bottem side of the main board?

sideways-FC

ok I finaly found JS9-12 around the top of the main daughter board! I dont know how I mist it. now I have to conect VR2out on the zeal board to JS10 on the main board. But there is already a wire soldered in to JS10 that goes from JS10 to Q16 at the top right of the main board. so do I just kind of make it so there both solderd in there or what? because the instructions dont say anything about removeing that wire unless I mist it somewhere but I dont think I did.

Aaron Cake

iTrader: (1)

Sounds like your Megasquirt is set up to run a single ignition coil as if it was a dizzy installation. That's how most of the vendors set them up. Remove that jumper.

sideways-FC

I removed the jumper. the zeal is insalled and im in the process off doing all the external wireing now, and i prity much got that all figuerd out. I still need 2 get a tps and figure out a mount for it. can I use the stock clt and iat right?

Aaron Cake

iTrader: (1)

You can use the stock sensors, but why? They are old, probably failing, read weird values and expensive to replace. That's why I recommend the cheap and abundant GM sensors. Plus the 'Squirt is already calibrated to them from the factory.

sideways-FC

ok I have the engine in the car and Im working on wireing up the ms. so far everything I wired up is working exept the cas. I had the laptop hooked up and spun the cas by hand and the rpm was 0. I have it wired up the way diyauto tune tells you to wire it up with the zeal on a 3.57 board. Im still trying 2 figure out how to post up an msq. if I could get a little help with that to that would be awsom.

Aaron Cake

iTrader: (1)

If all the software settings are correct, and all the jumpers on the boards are correct, then the easiest way to troubleshoot a no-RPM issue is to use a scope to trace the signal from the CAS all the way through the VR circuits.

sideways-FC

well I dont have a scope. I geuss I could check and make sure my jumpers are in the right locations coz that Im not 100% shure about. and the wireing seems a little odd to me. Im going off of the wires on the cas side of the cas plug. diy auto tune says connect the white wire to pin 2, but pin 2 is the wire that wraps around the cas wires to reduce noise. does that sound right? the green wire goes to pin3 of the db15 and the white/black striped wire goes to pin 4 of the db15 and the red wire goes to pin 24 of the db37.

sideways-FC

Ok I think I found out why its not reading rpm. there was a jumper that wasnt were it should have been. But I cant test it because I have a new problem now. my laptop wount connect to the magasquirt! ill turn the ecu on and hit detect and it dont detech the magasquirt. ive tryed every com port from 1-6 and test it and it will fail. I dont know if its my radio shack cerial to usb cable or what!?