Search found 666 matches

by stefanst
Tue Apr 13, 2021 3:10 am
Forum: You and your build
Topic: red 2003 VVT test mule Miata NB2 #27
Replies: 212
Views: 90368

Re: red 2003 VVT test mule Miata NB2 #27

Screenshot of a log running Hellen72c on the Jimstim with "instandrpm" enabled. SD card logging did not work, so the logging speed is a bit slow, but instantrpm shows nice and steady rpms. Not ziggy-zaggy as one would expect when the teeth of the crank sensor are not where they are expecte...
by stefanst
Mon Apr 12, 2021 1:39 pm
Forum: You and your build
Topic: red 2003 VVT test mule Miata NB2 #27
Replies: 212
Views: 90368

Re: red 2003 VVT test mule Miata NB2 #27

Hellen72c shows the same unevenness oddness with spark and injector timing using the Jimstim to simulate the trigger pattern.
2021-04-12_09_35_10_041rpm_1143_maf_0.048.png
2021-04-12_09_35_10_041rpm_1143_maf_0.048.png (41.47 KiB) Viewed 116 times
by stefanst
Thu Apr 08, 2021 3:51 pm
Forum: You and your build
Topic: red 2003 VVT test mule Miata NB2 #27
Replies: 212
Views: 90368

Re: red 2003 VVT test mule Miata NB2 #27

Timing on Inj1 is also off from the look of it,
by stefanst
Thu Apr 08, 2021 12:05 am
Forum: Dev: Software
Topic: Frankenso pnp with jumpers for 94-95 Miata
Replies: 2
Views: 74

Re: Frankenso pnp with jumpers for 94-95 Miata

You are correct. The firmware is the same, the jumpers are different. The tune will be different too to deal with the different engine size and some different I/O.
by stefanst
Sun Apr 04, 2021 10:04 pm
Forum: Dev: Hardware
Topic: Hellen 72 - Miata NB2 up to 8 cylinders
Replies: 22
Views: 1322

Re: Hellen 72 - Miata NB2 up to 8 cylinders

Explain- what looks bad in that picture? I see the 1-2-1-2 on the cam and the 4 crank pulses in between.
by stefanst
Fri Jan 22, 2021 5:03 am
Forum: You and your build
Topic: The Lemon and Beer Money Motorsports
Replies: 27
Views: 2315

Re: The Lemon and Beer Money Motorsports

Nice build!

That 3071 should make what? 350-400hp? Boost onset around 4000?
by stefanst
Mon Jan 18, 2021 11:44 pm
Forum: You and your build
Topic: The Lemon and Beer Money Motorsports
Replies: 27
Views: 2315

Re: The Lemon and Beer Money Motorsports

Welcome!

Price, performance and quality of the PnP units should really meet the sweet spot for Miata builders.

How about some more details on the Lemon? Kraken setup? What turbo? Built bottom end? Dyno graph?
by stefanst
Sat Jan 02, 2021 12:15 am
Forum: You and your build
Topic: red 2003 VVT test mule Miata NB2 #27
Replies: 212
Views: 90368

Re: red 2003 VVT test mule Miata NB2 #27

Sorry- I thought you were trying to capture VSS. Reading comprehension fail.
I have 0 experience with those sensors. No AT experience at all. Looks like standard VR sensors though. One for turbine input (should be RPM I guess?) and one for output (should be output shaft speed divided by gear ratio).
by stefanst
Fri Jan 01, 2021 11:50 pm
Forum: You and your build
Topic: red 2003 VVT test mule Miata NB2 #27
Replies: 212
Views: 90368

Re: red 2003 VVT test mule Miata NB2 #27

I read input/turbine shaft automatic transmission speed sensor but having some sort of issue reading transmission output speed sensor :( Rockauto shows input shaft NTK AU0064 and another one NTK VB0108, I measure 400 Ohm on one and 600 Ohm on another. Are you trying to read VSS? Are you trying to r...
by stefanst
Fri Jan 01, 2021 11:42 pm
Forum: Making it Run
Topic: [NA6 1991 Miata, MRE48] How to convert to Kia TPS
Replies: 2
Views: 753

Re: [NA6 1991 Miata, MRE48] How to convert to Kia TPS

You can leave R22 installed. It's just a pull-up which will essentially run parallel with the TPS, not really causing any harm.
Please note that the KIA TPS solution is, to the best of my knowledge, as of yet untested.
by stefanst
Sun Dec 27, 2020 6:42 pm
Forum: Making it Run
Topic: Deceleration Settings (91' NA Miata B6ZE)
Replies: 20
Views: 1512

Re: Deceleration Settings (91' NA Miata B6ZE)

Make sure the throttle can close all the way. Many an idle-tuning session has been fubared by throttles cracked open slightly and randomly.
Also: NA6 Miata idle valve is funky. Sometimes the rpm goes up at lower settings. At least so I've heard- I have not confirmed this myself.
by stefanst
Sun Dec 27, 2020 6:35 pm
Forum: You and your build
Topic: Honda OBD1 CKP/CYP/TDC simulate signals
Replies: 2
Views: 314

Re: Honda OBD1 CKP/CYP/TDC simulate signals

The Jimstim can "emulate" something similar to a VR output- it simply runs a square-wave signal through a capacitor which creates a 0-crossing similar to what a VR output looks like. It's crude, but MAY work for you. No idea if your specific trigger configuration is included. http://www.jb...
by stefanst
Sat Dec 26, 2020 12:16 am
Forum: You and your build
Topic: 97 Miata MRE (turboz)
Replies: 16
Views: 1370

Re: 97 Miata MRE (turboz)

90% sure it's a 5V squarewave.
by stefanst
Sun Dec 13, 2020 12:55 am
Forum: You and your build
Topic: 1993 Mazda Miata
Replies: 30
Views: 1841

Re: 1993 Mazda Miata

Then I'm pretty sure it's fuel. I just found a log of my car idling. The mass air flow at 1000rpm is around 13.5kg/hr. This results in an injection pulse of approx 2.3ms. You are showing a mass air flow of around 22.5kg/hr, resulting in approx. 3.2ms injector opening. So your car is getting approx. ...
by stefanst
Sun Dec 13, 2020 12:29 am
Forum: You and your build
Topic: 1993 Mazda Miata
Replies: 30
Views: 1841

Re: 1993 Mazda Miata

Did you crack open the throttle to keep it running in that last log? If not, your MAF readings in idle are quite different from what my old '91 used to get. Your voltage reading is lower, which results in higher calculated airflow and therefore more fuel added. If it's too much fuel, that explains t...
by stefanst
Sat Dec 12, 2020 11:40 pm
Forum: You and your build
Topic: 1993 Mazda Miata
Replies: 30
Views: 1841

Re: 1993 Mazda Miata

Correct. Looks like the online version does not list pin 40.

This is how it should be set up:
40-AN Vlt 9.png
40-AN Vlt 9.png (10.37 KiB) Viewed 1526 times
by stefanst
Sat Dec 12, 2020 11:27 pm
Forum: You and your build
Topic: 1993 Mazda Miata
Replies: 30
Views: 1841

Re: 1993 Mazda Miata

It appears there is an issue with the default tune. The MAF sensor is on Pin 40. So the MAF input should be set to 40-AV9.

No idea how that one snuck in!
by stefanst
Thu Oct 15, 2020 1:06 am
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 5879

Re: 1995 NA8 Miata - MicroRusEFI PnP

Hi Mapaul!

Any progress?
by stefanst
Fri Oct 09, 2020 11:52 pm
Forum: You and your build
Topic: 2004 BMW 760 N73 "A big mistake"
Replies: 15
Views: 2193

Re: 2004 BMW 760 N73 "A big mistake"

I'll get the turbos. Because more turbo more better.
by stefanst
Wed Oct 07, 2020 12:42 pm
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 5879

Re: 1995 NA8 Miata - MicroRusEFI PnP

While I've never met anybody who actually removed the wideband to run a Narrowband, it may be feasible.
However, most widebands can emulate narrowbands and would therefore not throw an error code, if installed and set up correctly. So you can have your cake and eat it too.
by stefanst
Tue Oct 06, 2020 1:58 pm
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 5879

Re: 1995 NA8 Miata - MicroRusEFI PnP

The buzzing you hear most likely comes from the IAC valve. This is controlled by PWM. We may have to change the frequency. Nothing to worry about for now. I am going to assume that you are not seeing RPMs on the tach and this is why you asked about making the tach work. The tach should just work out...
by stefanst
Mon Oct 05, 2020 12:28 am
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 5879

Re: 1995 NA8 Miata - MicroRusEFI PnP

Andrey B is correct. We do not have a verified calibration curve (transfer function) for this MAF. As near as I can tell, at idle your air-flow should be approx 7-10kg/h. This is what I get with the NA6. Your MAF calibration seems to be reporting 2.0 kg/h or so, according to your log. The NA6 calib...
by stefanst
Sun Oct 04, 2020 8:16 pm
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 5879

Re: 1995 NA8 Miata - MicroRusEFI PnP

Well this certainly looks promising! Yes, the values do appear reasonable. There is at least one thing that's still not right: Your VE table seems one set up for speed density (running off MAP sensor). So the values for small When using a MAF (mass airflow) algorithm, this table should start out at ...
by stefanst
Sun Oct 04, 2020 6:14 pm
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 5879

Re: 1995 NA8 Miata - MicroRusEFI PnP

Maybe we should add those buttons also for NA8.
Of course that would require, as of yet non-existent, tunes for NA8.
by stefanst
Sun Oct 04, 2020 1:15 pm
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 5879

Re: 1995 NA8 Miata - MicroRusEFI PnP

An attempt at explanation: In an attempt to maximize versatility, some of the pins on the Processor serve dual duty. We are talking about pins not connected to the TLE8888. For example: Traditionally [AN Volt9] on the 48 pin connector serves as an analog input without pullup for voltage measurement....
by stefanst
Sat Oct 03, 2020 8:14 pm
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 5879

Re: 1995 NA8 Miata - MicroRusEFI PnP

I'm pretty sure I found the reason for the 0V reading. This last batch of MRE boards has R30 populated. This means that AV9 is configured as an OUTPUT, not an input. image.png image.png Easiest fix would be to remove R30. Alternatively, you could jumper 2O on the main board to another analog voltage...
by stefanst
Sat Oct 03, 2020 2:04 am
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 5879

Re: 1995 NA8 Miata - MicroRusEFI PnP

95 engine bay
95 engine bay
image.png (1.91 MiB) Viewed 3392 times
I just googled 95 Miata engine bay and the engine indeed seems to have a hot-wire MAF.
Still weird that it would show 0V though.
by stefanst
Sat Oct 03, 2020 1:08 am
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 5879

Re: 1995 NA8 Miata - MicroRusEFI PnP

We may have screwed that up. If the 94/95 MAF is indeed a hot-wire MAF and not flapper-style, it may require different treatment than the NA6 VAF. I am a bit surprised though that it would read 0V. It should show full-scale (5V) in absence of the 1k pull-down. AndreyB do you have a log of your NB2, ...
by stefanst
Wed Sep 30, 2020 2:24 pm
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 5879

Re: 1995 NA8 Miata - MicroRusEFI PnP

OK. Let me give this another shot. My brain is addled with too many different PnP boards and too many different versions.

On *your* board MAF is "AN Volt 9" which is pin 40. The MAP Sensor is "AN Volt 5" which is pin 27.
by stefanst
Wed Sep 30, 2020 3:13 am
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 5879

Re: 1995 NA8 Miata - MicroRusEFI PnP

The MAF transfer function was derived and verified from an NA6 car. To the best of my knowledge, the two curves are identical between NA6 and NA8. I think it's even the same box. Your assumption that the wrong pin is set is likely correct. It's probably set to Pin 27 (AN Volt 1) which is a remnant f...