MS2 Tuning Help MP62 Miata: cold start hard, wont idle, tune

[Mysticle31]

Hey boys and girls. This car has been sitting since about 2012 when I parked it half done and went back to school. Now I've graduated and have been finishing it to drive before I start working a new job
I'm piecing this car together from my 4 cars worth of crap that I collected over years of owning in Miatas. I was in school and haven't looked at it in years. I was an new with MS2 then, I'm full on idiot now. I'm in WAY over my head.

Car:

• Enhanced MS2 (You guys know of Revrant? https://mslabs.gr/)
• 1990 Miata
• 315cc?? Injectors. They are not stock, may even be 330cc.
• 1.8 Engine
• 99 NB Head
• 95 NA Manifold
• 1.8 Throttle Body
• 1.8 Coils 94/95
• Sequential Injection
• LC1 Wideband
• Speed Density - Temp Sensor is threaded in bottom of intake manifold, AFM is there for looks and I will delete it soon.
• Moss MP62 with Track Dog Intercooler

Tune:

• Tuned in TunerStudio
  https://drive.google.com/open?id=0Bye5_ ... GlfbndFNEE

Logs:

• Cold Start: Surprisingly, it started up right away this time. Usually the engine cranks and sputters. It does not want to idle and died right away, and was hard to start again, which is the way it is usually on the first start.
  https://drive.google.com/open?id=0Bye5_ ... GxHWmxWUEU
• Warmup: I let the engine warm up until the fans cycled. I ran VE Analyze Live during this time and did some revs.
  https://drive.google.com/open?id=0Bye5_ ... VdqbFNEbTg
• Warm Start: Starts up but still will not idle. I have to catch it. Lost communication due to my sloppy USB port on my Surface Pro.
  https://drive.google.com/open?id=0Bye5_ ... TVwYUM2LXM

Questions:

• What do I need to do to make this thing idle and start better?
• How is the tune in general?
• Anyone in Sacramento area (or bay area) want to take a look and mess with it? Any shops anyone would recommend when I get some money to tune?
• Also my tach doesnt work, I tried the resister thing they it did not solve anything. I figured this is Miata specific, I'm just mentioning it here.

[Mysticle31]

I drove it recently. All the same problems. Cold starts like an cold old diesel tractor, fuel pump runs all the time, wont idle (hard to catch)...

I ran VE Analyze Live which made some changes.

Start and Warmup then drive to gas station - filled with 91 octane Shell
https://drive.google.com/open?id=0Bye5_ ... DF1RE1SaUU

Drive to buddies house down the road:
https://drive.google.com/open?id=0Bye5_ ... XJrdnR5eGM

Drive back to shop:
https://drive.google.com/open?id=0Bye5_ ... F9mTE5QRm8

Current tune:
https://drive.google.com/open?id=0Bye5_ ... lhocEZqM3M

[Tompo]

hello mate,

fellow mx5 owner here, I think I can help you somewhat.

general idle tips:
set your VE in your idle cells (usually the lowest 3x3 cells in the bottom left corner) to all the same number - don't use VEAL to tune idle - use a number that gets your idle AFR in the 13.5-14.7 region - richer idles are usually stabler and make life easier when you're startin off.
Similarly, set your ignition timing to all the same value - 10 or 14 seems to work well with our cars. Mine's set to 14.
Doing this will help stabilise you idle

Cold start - a right ball ache to tune to be honest because you only get one chance each day...
Priming pulse: vary linearly from 4 at full cold to 1 at full warm then LEAVE it!!
Cranking pulse: general tips are - if you need to press the throttle to start the car you need LESS fuel (lower pulsewidth)
If it cranks, and fires and THEN dies - you need to increase your afterstart enrichment - dont mess about here - if it's struggling to stay running, increase it by say 20% increments until it does - it does matter if it runs rich for the first few moments - you can lean out your afterstart enrichments once you have a robust starting procedure.

When the car does fire, what rpm does it rev to? You can tune this with idle cranking duty/steps - if it fires up and the revs are too high, lower these values at the particular temp until your happy - you generally need it to rev a little higher when it's cold.

I would increase your warm idle speed to 900-950rpm, 850 is a little low in my opinion
increase your dashpot adder - this will help catch a drooping idle - somewhere around 1-2% is usually enough
increase your idle activation tps threshold% to 4% - i found with it set to 1% closed loop would not engage, even if the tps was less than 1%

Like i said dont use veal to tune idle - lock these cells in the veal settings
on a cold day, fire the car up, run warmup enrichment - let the car idle all the way from cold to fully hot without touching anything. if you change your idle ve cells - you will need to re-run WUE so don't chase your tail!

Hope this helps!