Megasquirt

[DunKrS]

So over the past few weeks I built a megasquirt II v3pcb and made an adapter harness and installed it on my friends 88 4ws prelude Si, the prelude is bone stock and I made no modifications to the stock harness, the megasquirt runs off of all the stock honda components.

I guess this isn't the most common option but it seems like there are more prelude guys into megasquirt than any other Hondas. especially the 3rd genners.

This thread isn't to discuss why not to use megasquirt as I'm aware of the tuning options available to honda vehicles via the stock ecu. I'm just curious if anyone here has used megasquirt on their cb7 or other honda (or any vehicle for that matter) and maybe open up a little discussion on issues around megasquirting hondas.

Megasquirt is an extremely viable option for Hondas now and with the MSExtra code, it really seems like other than user-friendliness, megasquirt is now just as good as if not superior to many honda tuning options, and for around the same price.

I will be megasquirting my cb7 and getting into tuning hopefully by spring. So I'm also hoping to find some people I can get ahold of if I need help with tuning. It's my understanding that whether it be megasquirt or hondata, VE and spark tables are VE and spark tables and will tune the same.

[Jarrett]

Megasquirt seems to find more popularity with the OBD-0 guys because the factory options available to us are not as easily available to them. However, that's not to say Megasquirt is any less superior. Assuming you've got the proper sensors in place and you're willing to put a bit of harness work in Megasquirt can be a very capable system. I think GhostAccord will be using it on his build with one of the purposes being a much simpler (not to mention much cheaper) avenue to run individual coils.

I was looking into getting a 280Z a couple of years ago and anybody doing any sort of engine work on the fuel-injected models use Megasquirt nearly exclusively. It's also a great learning tool and that's how it's marketed to its customers.

[GhostAccord]

Love my MSIII with the MS3X board.... I actually got it up and running off my Moates B series engine simulator. So if it works with that, there should be no issues running any Honda Engine...Biggest thing is to calibrate all of your Honda sensors, MAP, WBO2, TPS, ECT & IAT. The MS code is based off mostly domestic sensors. There are a few import but they don't match the Honda stuff very well. I spent an evening last weekend calibrating the Honda sensors for my MSIII EMS.

Also make sure you have the proper settings in for the Honda cam and crank sensor inputs. Tooth count is very important.

I am using it for the ease of running a COP ignition and also running 8 injectors in a 2 stage (4x4) fuel injection system....

[DunKrS]

Ghost accord! I thought I read at one point that you used megasquirt! That's pretty cool. Isn't it just a matter of setting the thermistor adjustments?
I believe these are the correct values for the honda sensors no?
* Thermistor Measurements
o -10 C - 10,000 Ohms
o 40 C - 1,000 Ohms
o 120 C - 100 Ohms

I'm excited to just have the option to tune it however I want, whenever I want.
Want it to blow black smoke like a diesel? Richen the table up! Want to tune for mileage? Lean it out. I'm still learning but it seems much easier than changing needles, jetting and checking plugs and the concept is essentially the same.

[GhostAccord]

Actually this is what I found to be the most accurate for the MS 3 stage IAT/ECT thermistor settings.

Put "2470" in the Bias resistor box.

0°C = 6000
40°C = 1200
120°C = 100

I love PGM-FI tuning over carb tuning any day!

[cuate01221]

I'm also going with a piggyback, but I will be going with the Apexi AFC Neo. While it is older technology, it will do everything I need it to do and is very user friendly.

[toycar]

I'm also going with a piggyback, but I will be going with the Apexi AFC Neo. While it is older technology, it will do everything I need it to do and is very user friendly.

AFC(adjustable fuel computer) does nothing for ignition timing and is solely tuneable on fuel pressure and delivery.


It works, but its very behind the times.


I run megasquirt on my dsm's. Ive never ran it on a Honda, but I can speak for the quality and ease of using it.

MS is fantastic software.

[bigpoppa694lyfe]

A lot of the turbo guys in my area use megajizz. We got a turbo probe gt, turbo mustang gt (dude has over 30k invested into this thing), a soon to be twin charged sunfire (cobalt ss swap + turbo), and atleast 1 civic (367whp) all with the squirt

[Domesticated]

I used MSII+ in my first gen Neon R/T 2.4T swapped and sprayed. Shits legit.

[GhostAccord]

I'm also going with a piggyback, but I will be going with the Apexi AFC Neo. While it is older technology, it will do everything I need it to do and is very user friendly.

MegaSquirt is not considered a piggy back. It is a stand alone engine management system. You can't really compare it to an AFC unit.

[Apexbender]

There is so much info in the www.diyautotune.com (MegaSquirt's website). I am amazed by the fact that this system can do so much for a fraction of the price of a stand alone system (i.e. AEM EMS, etc.) and this system does pretty much everything that those systems do, it just takes time to wire the EMS and at the same time you learn how your system works. One can even add Bluetooth connect-ability! This is worth looking into.

[cuate01221]

MegaSquirt is not considered a piggy back. It is a stand alone engine management system. You can't really compare it to an AFC unit.

Yeah I noticed that after I did some research I just figured Megasquirt would go along with squirting gas haha

[GhostAccord]

It's all about the research!

After spending a few hours putting this thing together, reading all of the documentation and getting all of the sensors calibrated. I know so much more about how a PGM-FI system works. It's easy to see now, how just one little thing can make your engine respond differently. It's a long way from changing jets in a carb.

Aside from the DIYAutotune website there is also a very informative book that they endorse. Title; Performance Fuel Injection Systems, written by Matt Cramer & Jerry Hoffmann. Very good read, it covers the basics for fuel injection setups very well. Speed density vs mass air flow and alpha-N it's all in there.

[Apexbender]

I will look up that book on Amazon. I like learning and saving money, so I think this is the right system for my future build.

[DunKrS]

Gahh, I'm having trouble with my friends IACV, I have the flyback diode installed in the adapter harness and most settings in megasquirt either make the IACV buzz like it's about to explode or pretty much don't do anything at all.
I built the PWM circuit for the IACV and used the larger TIP122 transistor and insulated it with the clear mica insulator but still am not getting anywhere.

Anyone have any insight into megasquirt with a honda 2 wire IACV?