Megasquirt MS3 pro users

So i have been having issues with my SCT xcal 4 cutting out the gauges. Basically when i do a pull the gauges dies and then the tuner says disconnected when I'm data logging. I was thinking about going the megasquirt PNP route but wanted to hear some input from some users. Ive tuned a few cars using tuner studio and dsm tuners so the learning thing wont be to bad. How easy is it to setup everything and do you run dual widebands or single wideband with a supercharged car? Also how reliable is it? I've heard on other platforms of boards taking craps but nothing for the new edge platform. So anyone who has used megasquirt on the 4v platform any gripes or recommendations?

I think a few of us are running them now. I'm running dual widebands and overall like the set up. Make sure they've fixed the speedo issue before you purchase one. Other than that I'm pretty happy. I've put a few hundred miles on mine with no real issue.

Maybe no help for you , but I ran the MegaSquirt 3 on a pushrod 5.0 , for 5 years with no trouble .
Bought the kit , assembled it myself .

01yellercobra said:

I think a few of us are running them now. I'm running dual widebands and overall like the set up. Make sure they've fixed the speedo issue before you purchase one. Other than that I'm pretty happy. I've put a few hundred miles on mine with no real issue.

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What speedo issues are you referring to? I’m
In the same boat as OP and want to know everyone’s opinions


Sent from my iPhone using the svtperformance.com mobile app

03DSGMach1 said:

What speedo issues are you referring to? I’m
In the same boat as OP and want to know everyone’s opinions


Sent from my iPhone using the svtperformance.com mobile app

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Above 65mph the needle bounces a couple MPH. They know about the issue. I think I'm the one that brought it to their attention and it turns out it's an issue across the board. The only real issue with it is that it makes cruise control impossible to use. I talked to my contact about a month ago and he said they were close. I haven't reached out again since I have to pull the ECU and send it in to have it fixed. I haven't had the time or space to put the car down for the time needed.

There's a ton of support out there for the set up. I've looked at a few YouTube videos to help figure some things out. If the OP knows TunerStudio he's already ahead of the game. That was one of my main hurdles. I'm not saying I'm great with it now, but I'm a lot better than I was 6 months ago. And the tuning is light years ahead of SCT. I have the Bluetooth adapter in my car so I don't even need to plug my computer in. I'm thinking of picking up a cheap tablet and using that for tuning and datalogging. But there's also a built in SD card that keeps logs automatically. It's been nice to get home and think there was something I wanted to check and be able to pull a log from the card.

I have mine waiting to go in. I bought the innovate all in one gauge so I don’t have to run two wide bands.
From what I’ve read on here and heard from other people who are familiar with it, it’s an excellent setup for our cars

@01yellercobra did the manufacturer say they’re going to provide you and anyone else who already has it set up with a fix for the speedo? I didn’t ask before I bought it

BlckBox04 said:

I have mine waiting to go in. I bought the innovate all in one gauge so I don’t have to run two wide bands.
From what I’ve read on here and heard from other people who are familiar with it, it’s an excellent setup for our cars

@01yellercobra did the manufacturer say they’re going to provide you and anyone else who already has it set up with a fix for the speedo? I didn’t ask before I bought it

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Reach out to them. You'll have to send the ECU in for the fix. They already had mine for a month and a half while they worked on the issue. I had them send it back to me so I could drive my car while they came up with a solution. I guess something isn't giving a strong enough signal to the speedo.

01yellercobra said:

Reach out to them. You'll have to send the ECU in for the fix. They already had mine for a month and a half while they worked on the issue. I had them send it back to me so I could drive my car while they came up with a solution. I guess something isn't giving a strong enough signal to the speedo.

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ok cool. I guess what I'll do is install it now and get it set up and send it back in the winter or something.

01yellercobra said:

Reach out to them. You'll have to send the ECU in for the fix. They already had mine for a month and a half while they worked on the issue. I had them send it back to me so I could drive my car while they came up with a solution. I guess something isn't giving a strong enough signal to the speedo.

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So who is doing the work on the ECM, diyautotune? Im really pushing towards the megasquirt as i dont see any really affordable options that allow full control at this point. I heard HP tuners was junk for our platforms as well. So do you run fuel pressure inputs or any other inputs to megsquirt?

bmxr152 said:

So who is doing the work on the ECM, diyautotune? Im really pushing towards the megasquirt as i dont see any really affordable options that allow full control at this point. I heard HP tuners was junk for our platforms as well. So do you run fuel pressure inputs or any other inputs to megsquirt?

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Yes, it's sent back to DIY for the work. There's an auxiliary plug where you can add some extra inputs. The plug and play doesn't have as many extra inputs as the standard set up, but I think its enough for what most of us want to do. I did find an input that reads the FRPS since the MS3 can drive a returnless set up. But it needs some calibration.

My set up has the dual widebands, flex fuel sensor, wheel speed sensor, knock sensor. However it's not like you can plug in and go for the extras. Everything requires tweaking to work right. Well, not totally true, the widebands worked once I got the stuff in the tune correct.

Disclaimer: I'm not as smart as I possibly sound in these posts. I'm still learning a lot on this set up. If you really want to talk to someone knowledgeable hit up Malcolm. There's also a couple sites dedicated to thos ECU that is worth reading up.

01yellercobra said:

Yes, it's sent back to DIY for the work. There's an auxiliary plug where you can add some extra inputs. The plug and play doesn't have as many extra inputs as the standard set up, but I think its enough for what most of us want to do. I did find an input that reads the FRPS since the MS3 can drive a returnless set up. But it needs some calibration.

My set up has the dual widebands, flex fuel sensor, wheel speed sensor, knock sensor. However it's not like you can plug in and go for the extras. Everything requires tweaking to work right. Well, not totally true, the widebands worked once I got the stuff in the tune correct.

Disclaimer: I'm not as smart as I possibly sound in these posts. I'm still learning a lot on this set up. If you really want to talk to someone knowledgeable hit up Malcolm. There's also a couple sites dedicated to thos ECU that is worth reading up.

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So, i was thinking about getting the dual spartan widebands for the setup so i can auto tune. For wheel speed sensors you cannot use the factory ones? I am also going to be doing flex fuel as i am on e85 currently. I was thinking about running it on the return side closest to the tank for the least amount of restriction. so the extra inputs are labeled and then you just have to go in and setup the parameters and such? Im just about to buy mine, im just making sure i will be using it to its full potential.

Did anyone run the intake temp sensor? I see stinger is offering an intake temp sensor, does megasquirt not read both factory intake temp sensors?

double post

bmxr152 said:

So, i was thinking about getting the dual spartan widebands for the setup so i can auto tune. For wheel speed sensors you cannot use the factory ones? I am also going to be doing flex fuel as i am on e85 currently. I was thinking about running it on the return side closest to the tank for the least amount of restriction. so the extra inputs are labeled and then you just have to go in and setup the parameters and such? Im just about to buy mine, im just making sure i will be using it to its full potential.

Did anyone run the intake temp sensor? I see stinger is offering an intake temp sensor, does megasquirt not read both factory intake temp sensors?

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I think @GodStang is running the Spartans. If you're going to be running E85 the whole time I don't think you need the flex fuel sensor. If you're going to be switching from pump gas to E85 the flex sensor is a good idea.

You might be able to tap into the stock sensors, but I didn't want to disable my ABS.

I use the factory IAT sensor. It only reads IAT2 though. If you want to read IAT1 you'll need to add a sensor.

01yellercobra said:

I think @GodStang is running the Spartans. If you're going to be running E85 the whole time I don't think you need the flex fuel sensor. If you're going to be switching from pump gas to E85 the flex sensor is a good idea.

You might be able to tap into the stock sensors, but I didn't want to disable my ABS.

I use the factory IAT sensor. It only reads IAT2 though. If you want to read IAT1 you'll need to add a sensor.

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Okay that makes sense. Do you run no lift to shift or 2 step? Was it hard to get it to startup on e85? I'm worried the startup is going to be the hardest to get it setup for e85 and what not

bmxr152 said:

Okay that makes sense. Do you run no lift to shift or 2 step? Was it hard to get it to startup on e85? I'm worried the startup is going to be the hardest to get it setup for e85 and what not

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I'm not that far into it. But then I don't have plans to run a two step or the no lift shift.

Godstang would be better to answer the E85 questions. I'm still on 91. But with talking to him it doesn't seem like he had any issues getting it fired up. At least not anymore than me. Setting up the injector info correctly seems to be 90% of the battle. Which anymore you can get pretty easily.

01yellercobra said:

There's also a couple sites dedicated to thos ECU that is worth reading up.

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Would you mind posting a link or something for those sites? I know there are a couple on FB but I’m not on FB. May have to join just for the info though.

Thanks
Ken

01yellercobra said:

I'm not that far into it. But then I don't have plans to run a two step or the no lift shift.

Godstang would be better to answer the E85 questions. I'm still on 91. But with talking to him it doesn't seem like he had any issues getting it fired up. At least not anymore than me. Setting up the injector info correctly seems to be 90% of the battle. Which anymore you can get pretty easily.

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What knock sensor are you running and where are you locating it on the block?

bmxr152 said:

What knock sensor are you running and where are you locating it on the block?

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I used a sensor for an 05-09 4.6. It's mounted by the driver side motor mount. I think I posted the links on modular forums. I'd have to search. I ended up using a stud because the hole in the block was bigger than the hole in the sensor.

4sdvenom said:

Would you mind posting a link or something for those sites? I know there are a couple on FB but I’m not on FB. May have to join just for the info though.

Thanks
Ken

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Megasquirt Support Forum (MSEXTRA) • Index page is the one that has been the most helpful as DIY Engineers answer your questions. On facebook @MalcolmV8 has helped me a lot but like you said not everyone is on there and it's hard to track posts. I have had people reply to me and totally miss it.

It's really not that bad to get it up and running. All the major issues I have had have been 100% user error from me not taking the time to read.

I am running Dual Spartan ADV 3 Widebands and E85 flexfuel sensor. All my research people say do not put the flexfuel sensor on the return side as you will get air bubbles. Is that a problem? I am not sure. I was able to add on feed side with zero restriction.

I love it but still majorly learning.

So i have mine ordered with dual spartan widebands. Hopefully it wont be to hard to get everything running well. The plug and harness to wire in the widebands to comes with the megasquirt correct? Im hoping i can get all up and running in a weekend at the shop since i need to be able to run flex fuel with e85 being hard to find lately.