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Discussion Starter · #1 ·
Im thinking of putting a Megasquirt ECU managment system on my car anyone here useing one ? If so how hard is it to get your head around it ? In my application it will need to control fuel injection , ignition and the motor is to be supercharged v8.
 

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My name is Martin
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I read up alot on it in the past when considering options for my shit old Nissan thing.

Whats your budget and how much do you know about ECU's and how they work generally?
 

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Discussion Starter · #5 ·
I read up alot on it in the past when considering options for my shit old Nissan thing.

Whats your budget and how much do you know about ECU's and how they work generally?
As for the budget no sure but as I now want to fit a Paxton blower I will need a blowthrough carb which aint cheap so that got me thinking about fitting a Fuel injection system as that will make the Paxton install easier maybe. And as for uderstanding ECU I have a bit of an idea but if you take it one circuit at a time might not be to bad and there are quite a few forums for the Megasquirt.
So what did you find out when doing you readind ? As I have only just started reading :tup:
 

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My name is Martin
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I think before going further and choosing an ECU it's worth understanding what needed on the engine and how ECU's work, but the most difficult things are the mechanical items. You'll need to fit a trigger wheel (normally 36-1) on the crank pully and make a bracket to fit a sensor to point at the wheel. Hardest bit is to modify up an inlet manifold to take injectors. The last bit of course if having a decent fuel pump and regulator that can run in the order of 2-3 bar without vacuum. Any boost you add, increases the pressure so the fuel pump has to be a good one.

You'll also need to hook up a MAP sensor (3 bar is probably relevant for your case and quite common), an air intake temp sensor, water temp sensor, prob 2 Ford EDIS coils, a throttle body with position sensor.

I looked at MS about 6 years ago. Back then it was a full DIY kit down to building the ECU yourself and alot of the information was hard to come by as it seemed to be all over the place on the website. Not looked recently but I'm sure its better.

I went with DTA in the end, which was better supported by the rolling road local to me. You don't want to choose an ECU and find it difficult to get someone willing to map it. They'd have to learn the software and the quirks of the system and that will generally cost you.

If you want to homebrew the whole thing then go for MS. If you think you'll need someone to map it for you, MS may limit the people willing to do it, simply because they may not have experience of it.

I did have a good document that went through everything you'd need and how it all worked, I'll see if I can dig it out. It's a good place to start.
 

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there is a forum for megasquirt somewhere in internet land, il try find it, im not sure if he is on this site but a guy i race with (jsmcortina) is a developer/designer for megasquirt, he runs the green cortina RV8 at the tracks if you have seen it, i have heard alot of good things about this system mainly that its good value for money and from what i have seen its extremely flexeble to most engines, that links http://www.msefi.com/index.php
 

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The point of a blowthrough system is that it should be easy and cheap ,it will certainly be cheaper than injection set up , custom ECU etc etc

.Not a lot is required to mod a carb to blowthough. Gotzys got some links for modding Holleys ,my Weber didn't cost more than few quid to sort. You should be able to run 5/6psi with very little in the way of mods .

Paxton and Mculough ( sp?) used to be simple bolt on and go in the 50's, there used to be a site specialising in info , think it was VS57 or similar ?
 

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Haven't actually used megasquirt yet but plan to in the future for a land speed project after speaking to some guys at speedweek, see diyautotune below.

Doing a budget EFI still adds up so I'd suggest spending some time looking on turbomustangs and have a look at the Auto-nomics products as well as DiyAutotune. Professional products also has some reasonably price throttle bodies these days and edelbrock and intake elbows do elbow options as does Wilson's but these aren't the cheapest

I would personally go for installing bungs into a 4 barrel intake, apparently Devcon Aluminium putty can be successfully used over welding for the DIY approach...

The blow through carbwould be the cheapest option, have a read of this how to on modding a double pumper at Hanger 18 Fabrication, depending on your intended boost level you could always boost reference a mechanical pump as well as these tend to work up to 7 - 8 psi. If you wanted more, Racepumps also do boost capable Mopar mechanical pumps and regulators that can be referenced to save the extra wiring of an electric pump.

Megasquirt can be run just for fuel with a MSD unit and a distributor to simplify things, can'r remember the specifics right now though.

Which ever way you go just make sure you invest in a A/F tuner so you know if your too lean.
 
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