Getting Spare Megasquirt Components in the UK
Turbo Mini Forums

I've got V3.57 board that I need to get the finishing components for.

Does anyone know a place that has them all?
I've emailed Philip from ExtraEFI and he doesn't have them to hand.

Some parts come up on Farnell or RS but others don't.

Do I need the high current ignition driver if running EDIS?
(can't get one or the Bosh equivalent)

Other bits I can't find in the UK:
497-2629-5-ND Transistor PNP 6A 100V HI PWR TO220AB
TIP125TU-ND Transistor PNP DARL -100V -5A TO-220
A23305-ND or A32119-ND Connector D-SUB RECPT R/A 9POS PCB AU
A23289-ND or A32103-ND Connector D-SUB PLUG R/A 37POS PCB AU
And the plugs for the D-Connectors

Edit: oh and the MAP sensor, you can get it from RS but pay an extra £10 for postage from US. ANy where in the UK stock them?

Edited by dan187 on 25th Oct, 2010.

1275 N/A Sprite, 998 T2 Turbo Mayfair
1275 EFi Turbo

You don't need the high current ignition driver if running EDIS but why are you using EDIS ??? You can drive the coilpack direct (using two high current ignition drivers) and remove all the unreliability of EDIS and get better resolution on the timing.

Re. the parts, other than the MAP sensor, if they are the same as the V3.0 board uses, I've got them (or direct equivilants) as I ordered enough for several when I decided to use partial kits (PCB with no components).

I'll have to check those numbers to be sure, the hard ones are actually the D-subs as the V3.0 board uses a more compact one than standard (the solder pins are closer to the plug than nomal) to keep the case length down.

I'll check this morning. If not, I'm about to put an order into Farnell for some other bits I need so can add anything you want (apart from USA stock) as I now have a trade account (free postage and no minimum order).

I haven't got a spare MAP sensor as they are part of the partial kits, unless you can find a UK Farnell code in which case I can add it to my order.

Schrödinger's cat - so which one am I ???

Thanks Rod, yeah that'd be good if could. Let me know the price to post them to me once you've got them.
As I understand it the V3.57 is the same as a V3 but the components are pick and place.
So for ignition I would use two IC drivers and two coil pack from some vehicle or one pack using the EDIS coil pack?

1275 N/A Sprite, 998 T2 Turbo Mayfair
1275 EFi Turbo

V3.57 is (mostly) pre assembled using SMDs (surface mount, so more compact, but not so DIY) rather than discrete through hole components (which is easy DIY).

I've never seen one (only photos) but those digikey part numbers are the same "short" BD connectors that the V3 board uses so I have plenty.

The transitors are not the same as the V3.0 PCB as they are PNP (unusual) but have either the same (or direct equivilants) listed in Farnell.
The only slight anomily I can see is you've said the first one is a TO220AB case but the digikey number says a standard TO220 case - the only difference is the AB case has the tag electrically insulated so doesn't need a mica if your heat sink is the wrong polarity - but Farnell list one in AB anyway.

Ignition, just requires the one coilpack whichever way.
EDIS has two HV ignitor chips inside it, one for each half of the coilpack.
With MS2 you can simply replicate those two HV chips inside the MS box and let the MS2 drive them direct. It requires some additional wiring and possibly mounting the chips on the case if all of the heatsink is used and then you run the MS-Extra code and configure it for coilpack, wasted spark.

The additional wiring will be more fiddly on a predominanty SMD board.

Have a read here (nearly at the bottom of the page). Spark A and spark B is what you would be wiring.

http://www.msextra.com/doc/ms2extra/MS2-Ex...re.htm#layout35

I'm not using the Bosch HV chips but common "Fairchild" or "International Rectifier" ones - they do exactly the same but must be fused externally as they don't have inbuilt current limiting like the Bosch ones.

I'll put the two transistors on my Farnell order while your thinking about your ignition - I have all the other bits anyway (including Fairchild or I.R. HV ignitors, just not the Bosch ones).

Schrödinger's cat - so which one am I ???

Where did you find the info saying the Transistors are not the same? I haven't been able to find that?

If you're willing, I think the best thing would be for you to send the parts you think I'll need to build the megasquirt. (you have much more experience than I). FYI: My initial list above doesn't include all of what I need. Just what I couldn't locate in the UK.

The bits I have already are:
The V3.57 board
MS1 processor
40 pin mount for processor

Also, do you have any enclosures? and what cost are they?


Regards Ignition, if i've understood correctly, I'd need to source a single EDIS coil pack and a VR sensor but not the module? Then megasquirt will ground either side of the coil pack to create the spark?

Thanks for your support.

1275 N/A Sprite, 998 T2 Turbo Mayfair
1275 EFi Turbo

Re. the transistor you described it as "497-2629-5-ND Transistor PNP 6A 100V HI PWR TO220AB"
The first bit "497-2629-5-ND" is a digikey part number but the last part of your description is the case type "TO220AB"
It's a basic TIP42 transistor but the digikey part number says standard TO220 case (whereas the TO220AB case has the metal tag electrically insulated from the transistor internals) so it's just a case of whether a mica insulator is used or not - the build manuals are usually quite specific on this, ie, if part x is used fit the mica, if part y is used the mica isn't required. I've put the insulated one on the order at the moment.

Easiest way is you tell me the full list of what you want, I will have all the other "common" parts anyway but I don't know what your specification is, ie what you are using using the TIP42 and TIP125 for. Also I've only just realised you are using an MS1 cpu (I just assumed MS2 as the V3.57 is the most modern board) so you need this link for the ignition mods and would need to use the MS1-Extra code.

http://www.msextra.com/doc/ms1extra/MS_Ext...ware_Manual.htm

Beware my expertise (along with a few others) is on MS2-Extra but I think Wil/Ben and possibly Denis (and maybe others too) use the MS1-Extra setup.

Case is a problem if the V3.57 pcb is the same width as the V3.0
I'm afraid the americans are still a few decades behind the rest of the world and haven't yet adopted metric properly.
Measure the board width very accurately, if it's 4" (101.6mm) like the V3.0, you will have to source the case in the USA - the rest of the world has been on 100mm for a standard eurocard PCB for longer than I can remember and 100mm slotted cases can be had for less than £10 but you will NOT fit a 4" PCB inside one.

Ignition, as you describe it, provided the MS is wired with two ignitors and the Extra code used and set accordingly (as per the new link I've pasted as it's MS1 in your case).

Schrödinger's cat - so which one am I ???

Ah, I assumed that I'd need to fit all the components even if I weren't using them.

I will only be using the megasquirt for ignition, using two drivers as per your recommendation. (megasquirt as opposed to megajolt simply because I was given it, in case anyone is wondering).

So I think I need:

2 x ignition driver chips (& external fuses)
1 x 9-pin d-plug (both male and female parts)
1 x 37-pin d-plug (both male and female parts)
1 x MAP Sensor (I'll get this myself)
1 x LM2937ET-5.0-ND Regulator LDO TO-220

The rest of the components are for injection?

Then I just need to wire it up to include the two driver chips and select it to pick up a VR sensor.


forgot to mention: the pcb is 4" so i'll work something out for that

Edited by dan187 on 26th Oct, 2010.

1275 N/A Sprite, 998 T2 Turbo Mayfair
1275 EFi Turbo

That's easy then, I've got all those bits already, well apart from the MAP sensor which you're going to get yourself anyway, and the fuse(s) for the ignitor chips/coilpack - where you fuse them/it is really down to how your going to wire it all up. I have a common fuse in the 12V feed to the coilpack, others recommend individual fuses in the two wires from the coilpack to the ignitors as close as possible to the chips (even inside the case if it's large enough).

I'll PM you later with details.

Rod.

Schrödinger's cat - so which one am I ???