i dont know what you guys have avaliable but it sounds like not much yet. i think it would be prety easy to put a megasquirt on a dodge if someone was in need of some fuel control. here is a link to a write up i did awhile back. http://www.ls1tech.com/forums/showthread.php?t=245059

You know, I've seen people talk about MS a few times, and I've read a lil on it. I hate to be the guinea pig tho LOL Can it control any size injector? Right now I'm running a patched up setup of aux injectors controlled by a Split Second box and 36lb injectors controlled by an SAFC-II. It sucks. I'm way too rich down low (gonna try some 30lb injectors, should be able to smooth it out some). But it would be nice to ditch the aux injectors and just run some big injectors and be able to tune it. Standalones are crazy, $1500 for the AEM universal setup, that again, no one has tried on an R/T yet, or $2500 for an Accel DFI or FAST setup. Does anyone sell the prebuilt units? You don't want to see me with a soldering gun and circuit board LOL

Just finished reading your other thread. Looks like I'd need that flyback board to run the big injectors. Gonna do some more reading, but this looks very interesting. Too bad you guys are so far away LOL

You only need to use a flyback board if you going to run low impedance injectors. I have built 2 of these from the kit form and there really not that hard. I had never sodered anything like this before but I am an experanced welder, so that may have helped. You can get prebuilt units on ebay and from these guys http://www.diyautotune.com/products.htm
http://www.rs-autosport.com/

Both are great sorces and DIY Auto Tune is super fast on there shipping with great kit.
I might have an extra one and a stimulater I could sell ya, PM if your interested.

My biggest concern is how will the MS box work with the factory pcm? Will it throw codes? Will the factory pcm still be able to control everything else while the MS controls the fuel? Our trucks are heavily dependent on the pcm, tranny, dash, etc. are all controlled by the pcm.

Parish could coment on this a little better them me I think, but If you just added an air and water temp and taped into the TPS and an O2 and suppled and rpm signal to the mega. Then all you would need to do it hook the ground wires from the injectors to mega and it would be controling the fuel. The stock PCM would still "think" it was controling them, so it shouldn't throw and codes or anything. It wouldn't know anything was any diffrent. Are trucks are the same way as far as beind dependant on the pcm for so many things, and it seems to work for Parish. I am a bit of a Megasqurit newbie, but I have a real good understanging of how the system works. Where your so limited on tunning with your PCMs, I think this would work great! It would give you full control over your fueling and with a little work, could probably also fully control the ignition too.

just like Kb said. the stock pcm will not know you are messing around. you may have to put some resistors across the injector wires you pull off so the stock pcm doesn't see them missing. i have tuning acess so shuting off codes is no big deal for me. if you guys got any codes you would have to find a way around them like i mentioned above, a resistor should fool the pcm.

i ran 55lb high z injectors and am now running 95lb low z injectors with the fly back board. seem like a prebuilt unit with a harness goes for around $500, not positive about that. lots of places to buy them or you can build your own for much less.

on something new like a dodge i would start with fuel and try ignition later.

Yeah, I'm only looking to do fuel. Sounds like it'll hook up similar to the SAFC-II that I'm using now to trim back the 36# injectors, it intercepts the MAP signal. But with the MS I'd be able to ditch the aux injectors and just run some bigguns :) How big of an injector would I need for around 500rwhp? Well, and maybe a lil more, just to be safe, don't want to have to buy injectors twice. DIYAuto has them preassembled for $250, and another $50 for the harness. Does it need a dedicated O2 signal? Wideband or narrow? I have a wideband on my truck that I could feed to the MS. Definitely gonna have to keep researching this, it would rock if I could get it to work on my truck, there's definitely some more power to be had if I can smooth out my a/f.

for 500rwhp you should be ok without the flyback board. i am not sure what will bolt right into your truck but for a gm looking at the hp i would just go for the 60lb units. that would give you lots of room to grow if needed.

you can tie a NB or WB into mega. of course a NB will only acurately correct to 14.7-1 but with a WB you can target your a/f ratio to any mixture you like. i find this one of the most valuable features.

i found wireing the thing up very easy, tuning is very easy as well. loading up new software/firmware is kind of tricky but you probably wont ever have to do that unless you start usuing some of the advanced features and come across a bug of some kind.

I've got the rectangular injector connectors, I think they're EV1? I had to swap them in for the 36lbers. Hooking up the wb and being able to target a specific a/f would rock! Definitely gonna have to keep reading up on the MS, but I think I might give it a shot eventually. Gonna try 30lbers in my current setup, since I just wired in the SAFC, see how that works.

The megasquirt should work awesome for any platform. One of you guys needs to be a guinea pig. :D :judge:

Do your injectors connectors look like one of the ones in the pic below?

http://hauln.net/LS1Tech/truck/fuel_injector/Untitled_1/IMAG006.JPG

i think the mega is especialy good for people without any other tuning options.

The megasquirt should work awesome for any platform. One of you guys needs to be a guinea pig. :D :judge:

Do your injectors connectors look like one of the ones in the pic below?

Looks like the one on the left, is it rectangular. Stock mine had the newer oval connectors, but I swapped 'em out for the older rectangular ones to run the 36# injectors that I already had.

i think the mega is especialy good for people without any other tuning options.
That would be me LOL Well, no affordable options anyway. I'm gonna hold off for a bit, only cause the injectors are gonna cost more than the mega LOL But I think I'll give it a shot.

Do it Dave! My buddy whose into turbos keeps telling me to put my truck on the MS, but its just about stock lol. I want to try it eventually.

Do it Dave! My buddy whose into turbos keeps telling me to put my truck on the MS, but its just about stock lol. I want to try it eventually.
Is he local? I'd like to find someone local who has experience with it.

The injector connector on the left in that pic is a rectangular type. If you have that type they make high-z injectors all the way up to 75# but, I can't find a link at the moment to see what pressure that rating is at.

What sort of fuel pressure do you R/T guys have?

the 60's and 75's and most other injectors are rated at 3 bar, 43psi or whatever it is. i have the 96's wich are more like 108's at the higher fuel presure i am running. :)

Very interesting. Can the MS accomodate nitrous? Like through a WOT switch? And having a large overlap cam is gonna kill my MAP signal, so can it help there too? I was planning on just going with a FAST system, but if this is cheaper and can do it all, I'll step up and try one. I'll just retard the timing with an MSD while on the bottle and all should be fine.

The injector connector on the left in that pic is a rectangular type. If you have that type they make high-z injectors all the way up to 75# but, I can't find a link at the moment to see what pressure that rating is at.

What sort of fuel pressure do you R/T guys have?
I'm running 55psi right now, it gets up to high 60's under full boost (rising rate regulator w/aux pump), stock pressure is around 50psi. I'm thinking some high-z 60's should work nicely.

I've got some extra MS stuff for sale if anyone is interested. PM for details and what your looking for.

Dave- the guy I was talking about doesnt have megasquirt, but he read up a lot on it. He had a turbo dodge powered lebaron and now drives an 05 legacy 2.5GT. He just wanted me to be his guinea pig.

Oh, ok. I have a feeling I'll give it a try, probably after the new cam and stall go in. What I have now will get me by until then. Then I can really tune it in with the MS once I have my setup complete.

I'm with you. I was plannign on running a FAST system, but really cant justify it as I'm not boosted. My nitrous setup is gonna be a full dedicated fuel system for a carb setup and be completely independent of the fuel injection. But, I'm gonna run a rather large cam, the Edelbrock heads, etc etc, and I dont see my idle vacuum beign high enough to run the truck off a stock PCM. And in the future when I step up to the 416 I'm gonna need a lot more fuel then the 318 requires. And once again, the stock PCM aint gonna run the 416. :judge:

Let us know how it goes. From what Ive read the only hard part on the mopar is gettign the crank signal.

Let us know how it goes. From what Ive read the only hard part on the mopar is gettign the crank signal.
MSD crank trigger!! :thumb:

Put an EDIS wheel on the crank pulley and be done with it.

Look into the "second wheel decoder" option in the Extra software for MS - I use it on a variety of motors, it lets you combine the Cam position signal with the Crank position signal to get accurate decoding in Megasquirt, then you can run coilpacks.


As a comparison to FAST, (except the new XFI), megasquirt is quite a bit more intuitive and easier to understand; it also gives you user-definable RPM and MAP points for editing, whereas FAST only allows you to select "increments" that you can tune on. FOr example, every 500rpm or every 600rpm. Not any RPMs you like. Megasquirt, with the extra firmware, also has a ton more options. If I were going to run a Meany-built system, I'd go with a BigStuff3.

-scott

So, how hard would it be to use this on an 03+ 5.7L Hemi?

Anyone in the Southeast/ Mid-Atlantic area that will install these?

So, how hard would it be to use this on an 03+ 5.7L Hemi?

Anyone in the Southeast/ Mid-Atlantic area that will install these?

I don't live near you, but this wouldn't be any harder than running MS on any other motors out there.

In fact, I have been asked to MS a turbocharged, built-up 5.7 hemi in a Dakota R/T this winter. GOnna be awesome!!! How many turbo new hemi's are there out here anyways so far? I should know quite a bit more about them in the near future, the guy is getting his pullout motor this week,

-scott

hooking it up and making the motor run great would be easy but you really dont know what other snags you might run into with the stock computer and the rest of the truck once you start controling things with the mega. making one run in a transplant like the dakota should be easy.

you really dont know what other snags you might run into with the stock computer and the rest of the truck

I'm not too familiar with the MS but I have been reading alot and I had a chance to talk to dieselgeek today (thanks for your time). I REALLY like the thought of going with a Megasquirt set up. That said, what "other snags" could we run into? My truck is getting a tune now that includes much improved tranny function- could I keep some parts of the tune I have and add what I need of the megasquirt????

Thanks

to hook up the megasquirt you will have to cut the ground side of the injectors and take those to the megasquirt. the stock computer might notice that you cut those wires and set a some kind of code. if it does see the cut wires and gets upset about it then you might have to try and fool the computer into thinking those wires still goto the injectors, something like wire in some resistors.

same goes for the ignition, not sure what the stock computer will think of you taking over. it might not care at all.

not sure what the stock computer will think of you taking over. it might not care at all.

Hope not ;)

Thanks for the PM pointing me in the right direction. When I get my truck back, if the tune isn't exactly as I want, it'll probably be on a trailer coming to a town near you :nod: dieselgeek will get to figure out what the stock pcm likes and dislikes ;)

scott is the man for geting around the little things that can stump ya.

Hope he can figure it out. I'm betting that we meet pretty soon. :)