hoohaa

Thanks for the replies guys. I think I might run the tach input through a shielded twisted pair cable as was recommended by zya and also run separate heavier gauge wire for the grounds rather than using multiple conductors out of that cable. I don't know, we will have to see when we get the motor in there!

I've got a normal length run from the glove box to the motor. I bought some 25 conductor cable with 24 AWG color coded stranded wires. I have read different suggestions from different places about wire size, some saying 18 AWG for everything and some saying 14-22 AWG. Would 24 gauge wire cut it for some of the sensor circuits? I won't be using anything smaller than 14 AWG for the injector circuits, grounds, fan, and stepper IAC circuit. I will have the harness very well protected throughout the run.

Yeah I was referring to what you would do differently if you were to go back to the dyno.

Is there anything you would do differently?

I've wanted to hear from someone who has built one themselves from the circuit on msextra.com but I will probably end up buying the viatrack sensor as well. It's already built and proven to work and pretty cheap.

That's what I thought. Haha something tells me any savings on a lean cruising tune will be canceled out by the heavy foot people always seem to get when driving a car with the kinds of goodies that normally go with MegaSquirt. Still, a lean cruising tune sounds like music to my ears, and like... I dunno, leather conditioner.... to my wallet. I've always assumed you could match or beat most stock EFI cruising tunes for fuel mileage. Lean it out as far as you think you can under low load, then dump in the fuel under highest loads, with programmable maps and target AFRs in MS the only limit is the amount of time you want to spend getting everything perfect.

This is exactly what I'm planning to do when the time comes to wire up the motor and MS. I want to use a single heavier gauge ground wire (probably like 10 or 12 awg) and remove patches of insulation, solder in jumpers to all the grounds on the motor, then seal the connections up with good heat shrink. The 12 gauge wire is more for mechanical strength than for conductance, I figure that it will take a beating if I'm constantly stripping and soldering to it, and it needs to be fairly tough. The DB37 side connection can be done simply by stripping off enough of the ground wire insulation, laying it over or wrapping it around each MS grounded DB37 pin, then soldering it. I would also like to see pictures of people's wiring harnesses. Especially if they took lots of time to do a nice clean job. There are not a lot of MS wiring harness pictures that I have seen on the various forums in which I lurk. I don't know where it is, but there is a picture of an L28 Z car (perhaps BRAAP's?) that has a pretty clean looking wiring harness. What I like specifically about this car is that the injectors were wired in such a way that the wire fit inside a very small split loom and stretched in a very straight line across the tops of the injectors. It came out looking very clean.

Have you read through the MS faq and links at the top of this forum? That's where I started after I had read completely through the megamanual. There is a ton of information in this forum answering all your questions in detail. The FAQ and links threads are the best place to start. I went with MSII, because it's not that much more expensive and it is the platform that is being developed now. The MSI code has reached its zenith and will not be developed further. With MSI you can really do everything you probably ever want to, but I have a hard time saying "no" to more toys, such as I get by running MS2Extra code.

Ken (muythaibxr) gave me this response on the MS2Extra forums: I am not sure how I missed that little tidbit in my reading of the manuals and the MSExtra forums, but I did. Hopefully this thread will help someone down the road. Thanks Matt!

That would explain why I cannot find a way to change it. Am I correct in understanding that the percentage is actually based upon the range of the map sensor rather than the actual boost measurement, i.e. "100%" could be 250 kpa for the standard MS map sensor or 300 kpa for an upgraded sensor? This is not a problem for me unless I decide to go with a larger sensor, which is unlikely. It is also adds on more step of abstraction since I will be converting percentage to kpa and then to pounds of boost, until I can start thinking in kpa rather than pounds boost.

I'm a little embarrassed to ask this. I had a MSII B&G msq set up, but then I converted the MSII to run MS2Extra code. After I made the conversion my MSII had the kpa axis of the VE tables listed in percentages rather than a direct kpa value as it did in MSII. I want the VE table to be based on actual kpa values rather than percentages. I know there is some way to change this, but for the life of me I cannot find it. I've looked all through MT and the MT configurator, but I have not found a setting page where I can change this. If someone could help me out I would really appreciate it. I don't think the MegaManual mentions this since it's a MS2Extra issue.

I just ran across this thread: http://www.msextra.com/viewtopic.php?t=24702 GREAT info on the Nissan CAS distributor and MegaSquirt settings. You must be a forum member and logged in to view the files. I have them archived if they are ever taken down.

I'll check on that. I'm only planning to use PWM, so that's fine.

Do you think I still need to check these components even though I'm up and running fine now? Q4 and Q20 have been thorns in my side from the very beginning. If I could have board problems that are just lying dormant for now then I probably need to desolder those and be careful not to use too much solder this time.

I'm eyeing this thread with interest to see what's mentioned about o'scopes. I would love to buy one and learn to use it, but if it's going to be too expensive to find one that actually does what we need it to then I'll have to pass.