69 replies to this topic

[TurboTim]

So who else has ran megasquirt? I see you did Robbie. You ran MS1 or 2 right? Does it compare as far as setup to MS3?

[mdlimy]

TurboTim, on 09 March 2012 - 02:42 PM, said:

See but this is what you dont understand...A temp sensor is unlike a 3 wire TPS or MAP. A 2 wire coolant sensor shares its 5volt ref and signal internal of the ECU and the sensor is pulling it to ground. So if you add two 5 volt wires on a temp sensor together you double the current. On a TPS this doesnt matter because the extra current just goes to the ground wire.

Here this link may teach you...Looks like I can put a higher internal resistor in the pull up resistor in megasquirt to keep current down so I dont end up with a higher voltage on my coolant temp sensor.

http://www.megamanua...al/sharesen.htm
Looks like other people have figured this out. I mentions that it may be easier to just run 2 different sensors but we will see.

i can see how that would be an issue, that page in the manual seems to solve the issue tho, but for how easy it would be to add a seperate clt sensor it would be nice to have the piece of mind that the motronic is getting the reading it wants.

TurboTim, on 10 March 2012 - 04:10 AM, said:

So who else has ran megasquirt? I see you did Robbie. You ran MS1 or 2 right? Does it compare as far as setup to MS3?

ms2extra, it did the job, didnt like that i had to run batch fire on the injectors(no support for seq.) and i didnt like the megasquirt hardware, ms3 hardware hasnt changed much, still dont like it, although i havent had a chance to see any ms3 units in person it is miles better than ms2 but for the price i feel like the vems ems is much better and thats why i made the swap.

pretty current ms3 setup
http://volvospeed.co...uirt-3-install/

andrij(smoneh) has my old ms2 setup on his 850, not a whole lot of people using it, karl and alex buchka ran a 5cyl in their 242 on ms1, there seems to be more and more people posting online about it lately, i just recomend vems every time lol.

[TurboTim]

Yeah I think I may end up running another sensor but we will see. WTF is up with the fuel pump relay. We dont have multi speed fuel pumps do we? I can not get the relay to work...may just swap it out with a regular one I guess or I guess I could have the stock computer control it.

The VEMS unit does really nice for the money. Pretty much same price and megasquirt. Better connectors and surface mount resistors. How do the options compare as far as like software. Does it have anti lag and all the other goodies?

[mdlimy]

TurboTim, on 10 March 2012 - 06:34 AM, said:

Yeah I think I may end up running another sensor but we will see. WTF is up with the fuel pump relay. We dont have multi speed fuel pumps do we? I can not get the relay to work...may just swap it out with a regular one I guess or I guess I could have the stock computer control it.

The VEMS unit does really nice for the money. Pretty much same price and megasquirt. Better connectors and surface mount resistors. How do the options compare as far as like software. Does it have anti lag and all the other goodies?

vems has everything ms has pretty much, antilag, boost, wheel speed, knock, and then also EGT and a built in wideband controller.

The fuel pump relay i belive is triggered by some weird signal from the stock ecu, maybe a hz signal, not sure. I would run a new relay with its own dedicated wiring for the pump, stock wiring is kinda meh and i think the pump would be happier with some heavier gauge wire when it is working hard. Although it all works fine for most people so the easy route would be just let the stock ecu control it.
Me7 is returnless fuel i believe so maybe you do have a multispeed pump to control pressure?....not sure.

[TurboTim]

I was just thinking back to this and I may be wrong but I remember tuning an Audi and it had VEMS and I remember thinking "damn this really looks and feels like MS1 or 2? Then I was looking on my "Tune Time" laptop and I do have VEMS software on it. Am I crazy?

[mdlimy]

the old vems used megatune/tunerstudio for tuning software, is that what you used? the vems used to be very similar to megasquirt when it first came out, it has slowely gotten better, over the last couple years it has really take off and the new vemstune software is great, its very usable and works awesome.
I can understand wanting to use ms2 for the money savings as opposed to vems, but if choosing between ms3 and vems its kind of a no brainer, anyone that has used ms and vems will tell you the same thing

[TurboTim]

mdlimy, on 10 March 2012 - 08:12 AM, said:

the old vems used megatune/tunerstudio for tuning software, is that what you used? the vems used to be very similar to megasquirt when it first came out, it has slowely gotten better, over the last couple years it has really take off and the new vemstune software is great, its very usable and works awesome.
I can understand wanting to use ms2 for the money savings as opposed to vems, but if choosing between ms3 and vems its kind of a no brainer, anyone that has used ms and vems will tell you the same thing

HATER!
Well I will keep an eye out for the next car I see with one so I can check it out. I just see too many megasquirt and I have never built one myself and just wanted to try out the electronics side. There is alot of code writing too so if you want to do something else someone may have done it. Im sure you remember that from MS and the forum seems to be pretty good so far. Though I will keep checking out for VEMS. Maybe my next project.

[mdlimy]

Vems is the same way, all open source, new code being writen all the time for differnet options, very similar to ms, i love ms but the hardware is just a bit dated for my taste.

[TurboTim]

https://picasaweb.go...134662879411954

Got everything up and working now. Running on MS3 and stock computer is running dash and AC.
I will slowly keep posting videos though.

[TurboTim]

Tuning the VVT has been a fun thing for me too. I can have it lope like it has a cam at idle just for fun. Been studying camshaft theory too trying to figure out the best tune.