I have searched and read all about the megasquirt ecm.
My question is it worth swapping to the megasquirt or just run a 730 with the typhoon $58 code?

My engine is a L98 (350) superram, twin turbo T3s with NOS. I just repinned my 730 to run $58 code and still am trying to get my car to run right.

Also is megasquirt really more user friendly than $58 in Tunerpro RT?

 

I'd suggest you look at the, MOTEC, Gen VII, or XFI. They're really designed for something as radical as you have. Not to mention that you might be running Peak, and Hold injectors to feed that beast.

 

Mega Squirt is a good candidate, but only MSII is out right now. You would really need Ultra Mega Squirt for all of that. Play it safe.

 

There's more than 1 way to skin a cat. Either ECM will probably do what you want.

I think MS-I with the Extra code would probably be up to task for your setup. Go look at www.turbotruck.net. Those guys are running 10s in a late-model Chevy 1/2 ton with a turbo'd (maybe NOS too) LS1 running MSnS-Extra. Go look for posts from dieselgeek on msefi.com

I'm running MS-I on my N/A 406 Stealthram and am very pleased with the ease of use. I have the MS-II upgrade as well, but am not running it currently.

This is my first EFI project, so I have no experience with the GM ECMs, but if you just read up on both of them, MS sounds much easier for an average person to tune, imo.

-Dave

 

The problem is i need my lockup on my 700r4 and you lose that when swaping from a 730 to a 749 ecm, along with egr control.
Im also finding it hard to tune the $58 code.

Will a megasquirt replace the factory 730 while still retaining all of the factory options to meet my needs?

 

Running the $58 code is either the '730 or the '749 will retain the TCC and EGR. Not sure what you don't think it does.

RBob.

 

Probably not. It will run the engine, and there's probably an easy to mod lock-up the TCC, but you'll have to figure it out on your own.

-Dave

 

Sounds like you missed the egr fix on a v8 post.
And, well, a 749/$58 was designed to run a 700.
Just what trans did you think a Syclone came with?
Not to mention there a manual trans bit in there too.
An ECM bench would be a lot easier to see what does what than guinea pigging your car. But most people do it w/o a bench.

 

I just cant stand reburning chips all of the time and not getting anywhere. Ill look into getting one.

 

The Prominator solves the burning issue.
With one of those installed it is essentially the same as a MS.
One of these days I'll learn C and figure out what they did with the MS code. For it to be easier, they had to remove some of the adjustability/compensation calcs.
That said, If the UMS had been out when I started, I probably would never have gone with a stock ecm.
I also like the VEMS setup. But it's a little pricey.

 

So would it be a better investment to buy a ecm bench or a prominator?

 

I'm starting to lean twords the MS myself. Faster ECM, C code. How can you go wrong?

Builds with GCC in linux..

I think my project this winter will be converting to a MS.

-- Joe

 

I'm not nocking the ease of coding the MS.
There are minor problems with the hardware.
Things you'd never see on an oem ecm.
One kind've aggravated me when I read it.
People were hooking the 12v power to the ecm up to the same wire as the key switch. Not keyed power. So voltage spikes were taking out a board component. The quick fix is to not wire it that way I know.
But
1) the circuit should have been designed to take that.
2) Some EE type writes in that he had that problem and fixed it by installing umpty squat component wired to gnd on the input.
Months ago!

Gee, thanks for pointing out the problem so it could be dealt with!

Like I said, the UMS might be a different story.
I mean no disrespect to the MS crew either.
But a 7730 is still cheaper than a smokless MS ecm..

Prominator vs Bench- I bought both. APU1 actually.
But you'll need a Prominator 1st.

 

MS is a D-I-Y project, and this point is *clearly* spelled out in the documentation. If a numbskull wires it up wrong, whose fault is that? It's not for lack of information -- the MS documentation is some of the best you'll ever come across.

Since you need a laptop to tune both systems, I'll contend the extra money spent on a prominator, or chips+burning equipment would easily make up any gap in cost. Most people with MS built it themselves, so in the event something fries/breaks, they can probably fix it themselves for less than $5-10 in parts from Radio Shack.

In the end, MS is fuel injection computer, not an OEM ECU replacement. It *can* replace them in some situations, but it is what it is -- a fuel injection computer. (and spark if you want)

Joe, I don't know you, but I've read a lot of your posts, especially your design and buildup of your single-plane EFI, and I'm gonna venture a guess that if you tried MS on your setup, you'd be pretty pleased.

-Dave