Hey everyone. Long time lurker but first post here so be gentle. I have a DIY turbo 97 with a t28 ebay clone, RC SL-440 injectors, and VW "R8" coil packs (06E 805 115 E),Innovate MTXL-Plus, and a 97 Speeduino built by Speedyefi. Anything else you want to know about my setup just ask. There are 94-95 pnp's available now and 96-97 coming soon I believe. Custom orders have been available for awhile though, so I was hoping someone else out there had one of these custom 96-97 pnp's as well. I have a thread started on the Speeduino forums that has been helpful, but the pros there just know about tuning in general. I was coming here in hopes of some Miata-specific help and tunes.

I was recently on the September firmware that just released, and I think it was August before that for a few days. These updates added a lot of features though, and without changing their default values, I couldn't get a really reliable startup and idle. I think afterstart enrichment was my biggest problem. So I recently rolled back to the March firmware with my last "best" tune. It's still not a great tune by any stretch but it works enough. When I was on Septembers firmware, I was trying to fix my basic settings with help from the Speeduino forums. Namely my injector dead time and voltage correction curve. At 13.5v and 45psi of fuel pressure at atmosphere, I should have a dead time of around .6ms https://www.rcfuelinjection.com/Stor...rated-injector I initially had my tune at 1ms dead time, but when i tried going down to .6ms like the chart says, the car would never reliably start, and if it did, it would die right after. I tried changing cranking fuel, afterstart enrichment, priming pulse, and everything fuel modifier related but couldn't get it to work.

I'm back to my March tune with the 1ms dead time and various other incorrect settings now. I was hoping someone else here had taken the plunge with the new 1.8 ecus and could drop me their well-sorted tune to look at, or maybe look through mine and tell me where I'm going wrong. I'm not even interested in boost related stuff. I just want some daily drivability and reliability out of the car. Other points of curiosity for me are throttle response and idle valve functionality. My engine just bogs when i give the throttle a blip and it's lost all responsiveness. As for my idle valve, it doesn't respond to pwm changes unless they're above ~75% duty cycle, then it decides to start moving. I don't know why it wont make small changes. Regardless, I'm rambling, so I'll attach my best March tune and what I was trying to do with the September tune.

 

 

Lmao my bad. I had half this typed up, and then my phone crashed and I lost all of it. I didnt really have the patience when I typed it a second time. I'll put some spaces in.

 

Changing from 1.0 ms to .6 ms means the injectors are staying open for .4 ms less time everywhere. You'll need to add fuel everywhere including your VE table.

 

Thanks Spartan. A guy on the speeduino forums told me I was stealing fuel by reducing the dead time, but some reason I was thinking it would just be the startup sequence. I did add and remove fuel for cranking and ASE but I still couldn't get any combination to make it really start. If it did it would immediately die, which would make sense with the ve table being off.

Is there anything else in the cranking and idle settings that looks really off? Something that would prevent me from changing from 1ms to .6? Even on my March firmware tune it'll start and rev up and down a bit before it stabilizes. A speeduino forum poster helped me reduce that by adding a spark column around 500rpm with more timing advance to prevent stalling.

 

Does anybody have a starting point tune for a boosted NA8? Stock fuel system for now, with about 7psi boost. Thanks

 

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New here. Not sure where to look.

 

You are running speeduino and using tuner studio? check out turbo kitty?

 

From what I am seeing, the turbo kitty stuff seems to be MS2/3. Not seeing any Speeduino tunes. Maybe I am looking in the wrong place?

 

You may not be able to load the tune but you can copy it. I stuck brain's afr target and timing table on my haltech.

 

Not to thread jack, but laziness always wins. How close were brain's tables to the 2019-era haltech BP base map? Or did you use it as an opportunity to change the map axis back to the TS/MS standard?

edit for moar easiness:

 

I opened brain's maps in TS, then adjusted the breakpoints to what is set in the haltech ESP, and interpolated to adjust the figures to the new breakpoints

the axes are all jacked up and in teh wrong orientation so I then transcribed them to suit. My axes are as per the base map and the rpm is reversed from what you have.

Overall advance is the same, about 41 degrees total but the brain maps come on advance a little harder, they have about 5* more lower. Also a lot more advance under boost.

The AFR target tables don't have any lean cruise stuff. When I get on my laptop I'll post a cap of what they look like when converted to the haltech breakpoints and orientation.

 

Speeduino ve table is scaled 0-255 not 0-100 so you can use much higher ve numbers than normal ecu tables.... I like to set the ve at 60 to idle at 14.5... So just adjust your deadtime to get around that value/afr.
Then I like to log my battery voltages... Rev the car up a bit and note the voltage.... Then drop it back to idle and turn EVERY elec circuit on.... Lights heater fan on max. Ac on. Brake lights on etc and log that voltage.... Then I set the middle two voltages on the injector voltage correction table to those voltages.... Then make a note of your afrs when going between those voltages. You may have to adjust the voltage correction values so the afr stays stable between you "no load" and "full load" running voltages...
Congratulations you just did a base setup of your injectors. 😁

 

Those are ridiculously low boost timing numbers

 

I've had all sorts of issues with my idle valve too same problem only responds at like 75-100% instead of the "normal" 25-65%. Miata icvs are just crap.... I've bought a Ford ac239 idle valve that I'm gonna bolt to the plenum in place of the warmup valve