dawson128

95 Miata, MSPNP2, stock injectors

This is kind of branching out from my startup issue thread but was it's own issue in itself so I made this thread.

So I have my car set up on the basemap and it's running well aside from a few small issues. I started out with the base map found here MegaSquirtPNP by DIYAutoTune.com
Now onto the issue.. This basemap uses a req_fuel value of 11.2 when it should really be 5.5, and everything has pretty much been tuned in using this value.. what do I do? I feel like I have a few options.

Option 1 is to try and correct the tune I have and properly set the req_fuel value to 5.5 and then double the VE table and try to adjust things from there.

Option 2 is to update my MS and load the Braineack map from scratch. I feel like this would be my best option because the settings seem better when I look at the tune in TunerStudio. The basemap I have been working with is still using batch injection also. Again however, I have an issue in that this tune was made for a DIYPNP using his instructions. Here is the warning on his site, "They are specifically developed to work in conjunction with my specific documentation, so if you did not use the same inputs and outputs as outlined in my assembly documentation (e.g., using DIYAUTOTUNE's pinout), then these maps won't work out-of-the-box for you." So would I be able to use it without issues on my MSPNP2? I know nothing about building MS boards so I'm sorry if this should be common sense..

What would be my best option here? Sorry I've gotten myself into such a mess. I appreciate any help from you guys.

Thanks

acedeuce802

iTrader: (1)

Why do you think req_fuel should be 5.5 and not 11.2?

dawson128

I guess it doesn't HAVE to be 5.5 but that's what the calculator spits out when I put in the correct info (basemap says I have a 2.0 and 0cc injectors which is where 11.2 came from.) When I upgrade my injectors I'd like the values to be correct. As I mentioned there are some other things brains map has such as sequential that mine didn't start with. But either way, I just want to switch to a Braineack basemap but didn't know if the inputs and outputs would work for my MSPNP2...

acedeuce802

iTrader: (1)

Double check your info then. I get 11.9 when I plug in 1.8L, 4 cyl, 254 cc/min, 14.7 AFR. You say the car is running well on the basemap, which means that the req_fuel is good. If you had injectors that required a req_fuel of 5.5, but you were using the basemap with a req_fuel of 11.2, then you'd be running too rich for the engine to run.

What's the reasoning for switching to Braineack's basemap? Is it only because of the req_fuel issue? If the car runs well, then you don't need to switch base maps. A base map is just that, a tool to get the motor to run, but you will still have the same amount of tuning to do whether you use the MSPNP basemap or Brain's basemap, except you will have more work because you'll have to change all the inputs/outputs for your ECU.

If there is a good reason for using Brain's basemap, I would use the map you currently have, and copy/paste the maps that you desire from Brain's map into your current map. But this still doesn't make sense. If the engine is running, just tune it.

dawson128

​​​​​​Maybe I miscalculated something somehow then. I'll have to check and see what I did when I get home to my computer. Really the only things I wanted from brains basemap are small things like battery voltage correction things, deadtime, etc even though my values are pretty close. That was my other idea, just to take some of the settings from brains tune and plug them into mine. Specifically his sequential injection settings since my tune is using batch

Braineack

iTrader: (62)

you should probably do that. for example, i use certain inputs and outputs for the a/c and fan controls; no clue if they match your mspnp2.

dawson128

Right on Brain. Thanks! Other than manually copying the values the bootleg way (the way j do everything) by taking a screenshot and then punching in values, is there a way to export and import tables quickly?

Braineack

iTrader: (62)

you can import/export most the tables.

otherwise, you can open two instances of TS, one with each tune, and go window by window.

acedeuce802

iTrader: (1)

You can just copy and paste (control c and v). I would assume if you had 2 instances of TS open with each tune, you can just select the table and copy/paste it to the other one. If you ever need to scale a map or anything, you can even just select the map, copy it, and paste it into Excel. Then just copy/paste it back to TS.

StanTheMan

why is this so complicated?
calculating the the required fuel in MS2 would have to be the easiest thing out.
they even give you the choice. Metric or imperial.

engine size 1839cc or 112.2 CID
Injector size 253cc or 24.1 lb/hr
No of Injectors 4

size of injectors is perhaps debatable depending on what source you are using....but a few cc....are not going to make a huge difference. Here is where i got most of my info from.Fuel Injectors - Miata Turbo FAQ
on that note...I admire you just for the fact that you've managed to get yourself around the tune with all the other bits. Like injector dead time & voltage compensation correction....and so on

Braineack

iTrader: (62)

my basemap is a much better starting point than the mspnp2 basemap.

ridethecliche

iTrader: (2)

Haha I told you to just copy settings over!

dawson128

Yes I've noticed that after comparing the crappy tune I started with to yours -_- too bad outputs would be wacky if I tried to use it from scratch

dawson128

Sorry RTC 🙃

dawson128

I understand this.. I just must have missed a number or something when I punched it into the calculator. The only thing I'm not sure of is if Cranking PW needs to change after req fuel is changed due to Injectors being upgraded.

dawson128

Quick question. Why are your Idle Valve values while cranking so much higher than your "Idle Valve Open Duty". Also with your cranking PW and 10 degree cranking advance I was getting some kickback. Any ideas? Lean it out, less advance?

acedeuce802

iTrader: (1)

Cranking pulsewidth is a percentage of the req_fuel. So if you have the car tuned for stock injectors and a req_fuel of 11.2, then upgrade to larger injectors with say a req_fuel of 5, then your cranking pulsewidths will be appropriately lower. You may need to tune a little bit to account for different spray patterns and resolution at low pulsewidths, but it'll get you close enough.

dawson128

So for example right now with my 11.2 req fuel, if I set my cranking PW to 100% across the board, I would have an 11.2ms pulse width? 200% would be 22.4ms? Not that it matters but just confirming.

Braineack

iTrader: (62)

stick with their settings for those for now...

dawson128

Haha well it's more my settings now rather than theirs but I still get some kickback with 5 deg advance and a crank PW curve that has been flattened quite a bit. Will try 0 deg timing and maybe bring a little bit of fuel back