#1203, "MegaSquirt Ver.3.0. Install" Aug-27-05 07:12 PM by ForceFed
Anyone running MegaSquirt PCB ver.3.0. here in 2gnt? I'd like to know who they are. Need help in install it and such. I also would like to create a notepad for the install. Is there a write up of one anywhere?
Thanks guys!
When is the money spending going to stop on this fucking car?!
#1217, "RE: MegaSquirt Ver.3.0. Install" In response to Reply # 0
the 3.0 board is a little more difficult to assemble than the 2.2 but its worth it. there are two tachometer inpuit circuits, the opto isolator and the VR circuit. ive had better luck with the vr circuit, but you need to adjust the two resistors on the board to shift the signal level properly to the cpu.
#1222, "RE: MegaSquirt Ver.3.0. Install" In response to Reply # 2
I'll take it as a first note to use the VR circuit then. If you think it's easier to work w/.
Which circuitries do I need NOT to install. The V3 is full of options, I just need the ones that the car needs.
Originally posted by ner947 the 3.0 board is a little more difficult to assemble than the 2.2 but its worth it. there are two tachometer inpuit circuits, the opto isolator and the VR circuit. ive had better luck with the vr circuit, but you need to adjust the two resistors on the board to shift the signal level properly to the cpu.
When is the money spending going to stop on this fucking car?!
#1227, "RE: MegaSquirt Ver.3.0. Install" In response to Reply # 3 Aug-28-05 07:58 PM by ner947
Build up just about everything... R37 and R38 are optional, they are sort of expensive and not really needed. The only reason they are there is to offer protection if you short the injector wires to something. If you choose not to use them a 14 or 16 gauge wire installed as a jumper will work fine.
Q16 (a VB921 transistor) and R43 are only used for people with single coil pack setups, like a V8 with a distributor. I don't have those populated on my board. If you want to run spark and not use an external module like a MSD box or a 4G63 transistor you will need to have 2 VB921's wired up in the proto area with a good heat sink.
I didn’t really elaborate about the 2 resistors in my previous post because I was on my PDA... If you are going to use the VR circuit you will need to use the "VROUTINV" setting. Those two blue variable resistors will need a bit of tweaking of the zero crossing point and the hysteresis to get the CPU to see the crank angle signal. I used an arbitrary waveform generator set to make a square wave at 0-5 volts simulating a real crank angle sensor to get it perfect, but not many people will have access to such a device. Although if you hook your MS to the stimulator (a 0-12 volt square wave), enable the 420A decoder, and enable "Stim for wheel" in MT with 2 steps per output, play with one resistor until the RPM's drop to 0, then back off a turn or two, then do the same with the other resistor. This seems to work just about as well as hooking the board to a real 0-5 volt signal.
#1230, "RE: MegaSquirt Ver.3.0. Install" In response to Reply # 4 Aug-28-05 09:06 PM by ForceFed
I'll just install both R37 and Rr38 since I got mines from glensgarage. If it's an extra protection I'll do it.
The second paragraph, that got me confused. If it makes it any easier to run external modules such as the 4G63 transistors I mind as well go in that direction. However those are the ignition modules right? Same ones that can be acquired from junkyards? Since I'm going in that direction what do you suggest I do w/ Q16 and R43?
On your third paragraph pertaining to the waveform generators? Where on earth am I going to start w/ that one?! How or what is the 420A Decoder? Is that a code that needs to be integrated to the code for MegaTune? And if it is, what version of MT are you talking about?
I'm sorry for sounding like I was born yesterday but only way to learn is hands on. I appreciate your time.
Originally posted by ner947 Build up just about everything... R37 and R38 are optional, they are sort of expensive and not really needed. The only reason they are there is to offer protection if you short the injector wires to something. If you choose not to use them a 14 or 16 gauge wire installed as a jumper will work fine.
Q16 (a VB921 transistor) and R43 are only used for people with single coil pack setups, like a V8 with a distributor. I don't have those populated on my board. If you want to run spark and not use an external module like a MSD box or a 4G63 transistor you will need to have 2 VB921's wired up in the proto area with a good heat sink.
I didn’t really elaborate about the 2 resistors in my previous post because I was on my PDA... If you are going to use the VR circuit you will need to use the "VROUTINV" setting. Those two blue variable resistors will need a bit of tweaking of the zero crossing point and the hysteresis to get the CPU to see the crank angle signal. I used an arbitrary waveform generator set to make a square wave at 0-5 volts simulating a real crank angle sensor to get it perfect, but not many people will have access to such a device. Although if you hook your MS to the stimulator (a 0-12 volt square wave), enable the 420A decoder, and enable "Stim for wheel" in MT with 2 steps per output, play with one resistor until the RPM's drop to 0, then back off a turn or two, then do the same with the other resistor. This seems to work just about as well as hooking the board to a real 0-5 volt signal.
When is the money spending going to stop on this fucking car?!
#1233, "RE: MegaSquirt Ver.3.0. Install" In response to Reply # 5
Originally posted by ForceFed The second paragraph, that got me confused. If it makes it any easier to run external modules such as the 4G63 transistors I mind as well go in that direction. However those are the ignition modules right? Same ones that can be acquired from junkyards? Since I'm going in that direction what do you suggest I do w/ Q16 and R43? On your third paragraph pertaining to the waveform generators? Where on earth am I going to start w/ that one?! How or what is the 420A Decoder? Is that a code that needs to be integrated to the code for MegaTune? And if it is, what version of MT are you talking about?
The 4G63 modules can be acquired at a junkyard. I got a working one really cheap (less than $5 I think, can't remember) from a junkyard.
If you go that route keep Q16 and R43 in a safe place. If you eventually want to get rid of the 4G63 module you can buy 1 more Q16 and essentially mimik the 4G63 module inside of the MS which is nice because that way you have 1 less external component.
For the 420A decoder... It's part of the -extra code located on http://megasquirt.sf.net/extra The 420A decoder is a software option that tells the CPU that it is looking at a 420A crank angle sensor and not your average tachometer signal. This lets you run spark outputs using the LED's as a source to be hooked up to a VB921, a 4G63 module, a Crane/MSD box, etc... If you don't want to hook up to the crank angle sensor then you set this option to disabled, that is how you run fuel only. To enable the decoder in MT, it's under "Code Config -> Codebase outputs and functions"
#1250, "RE: MegaSquirt Ver.3.0. Install" In response to Reply # 6 Aug-30-05 03:17 PM by ForceFed
Hey Nate,
I've reviewed your last reply. I'm going to go ahead and finish building the MSV3 then study the 420A decoder along w/ the new MT. I'll get back to you in a couple of days when I'm through it all. I left you positive comment and points to go w/ it. If you like to leave something else that might have or needed to be covered that I need to do, go right on ahead!
Michael
When is the money spending going to stop on this fucking car?!
#1262, "RE: MegaSquirt Ver.3.0. Install" In response to Reply # 7
So Nathan, per manual install all parts on Steps 50 and 51? Next, then on Step 52 jumper VRIN to TACHSELECT and then TSEL to VROUTINV. I just want to let you confirm this.
When is the money spending going to stop on this fucking car?!
