Search found 659 matches

by stefanst
Sat Jan 02, 2021 12:15 am
Forum: You and your build
Topic: red 2003 VVT test mule Miata NB2 #27
Replies: 201
Views: 80588

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: 201
Views: 80588

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: 129

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: 491

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: 107

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.jbperf.com/J...
by stefanst
Sat Dec 26, 2020 12:16 am
Forum: You and your build
Topic: 97 Miata MRE (turboz)
Replies: 16
Views: 575

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: 24
Views: 786

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: 24
Views: 786

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: 24
Views: 786

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 524 times
by stefanst
Sat Dec 12, 2020 11:27 pm
Forum: You and your build
Topic: 1993 Mazda Miata
Replies: 24
Views: 786

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: 3876

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: 13
Views: 1327

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: 3876

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: 3876

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: 3876

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: 3876

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: 3876

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: 3876

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: 3876

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: 3876

Re: 1995 NA8 Miata - MicroRusEFI PnP

95 engine bay
95 engine bay
image.png (1.91 MiB) Viewed 2127 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: 3876

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: 3876

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: 3876

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...
by stefanst
Tue Sep 29, 2020 6:22 pm
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 3876

Re: 1995 NA8 Miata - MicroRusEFI PnP

Jumpers_To_Remove.png
Jumpers_To_Remove.png (2.32 MiB) Viewed 2229 times
by stefanst
Tue Sep 29, 2020 2:21 pm
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 3876

Re: 1995 NA8 Miata - MicroRusEFI PnP

Edit: I screwed this up too it seems.
by stefanst
Tue Sep 29, 2020 2:13 pm
Forum: You and your build
Topic: 1995 NA8 Miata - MicroRusEFI PnP
Replies: 45
Views: 3876

Re: 1995 NA8 Miata - MicroRusEFI PnP

I think I may be at fault here. Looking at the picture of your rusEFI I took before sending it out, it appears that I forgot to remove some jumpers (the little black rectangles close to the main connector). Sorry! EDIT: Let me get this right. Ignore what I posted before. I should have removed Jumper...
by stefanst
Thu Sep 24, 2020 2:07 pm
Forum: You and your build
Topic: 1991 NA6 Miata (Stock)
Replies: 33
Views: 2617

Re: 1991 NA6 Miata (Stock)

I think @AndreyB is right. I will build another ECU for you and I think I can find a car to test it in before shipping.
This is really strange though: You see rpm, injectors and coils are working. In theory, the engine should start.
by stefanst
Wed Sep 23, 2020 4:35 am
Forum: You and your build
Topic: 1991 NA6 Miata (Stock)
Replies: 33
Views: 2617

Re: 1991 NA6 Miata (Stock)

Hi all, I think it's the fuel pump, because I just tested spark at 11pm when it's very quiet, and I can clearly hear the sound of sparks. Tried cranking for 30s, no avail... so it's probably some signal from the ECU to the fuel pump (Circuit Opening Relay?) that is not hooked on the rusEFI board. T...
by stefanst
Tue Sep 22, 2020 1:44 pm
Forum: You and your build
Topic: 1991 NA6 Miata (Stock)
Replies: 33
Views: 2617

Re: 1991 NA6 Miata (Stock)

My hope is that the car will actually run as-is. Looking at your logs, the ECU never really gets a chance to complete two injection/ignition cycles to start the car. AS AndreyB already pointed out, rusEFI is not quite at OEM ECU speed when it comes to recognizing cranking. This means that it will ty...
by stefanst
Mon Sep 21, 2020 8:11 pm
Forum: Misc
Topic: How To Build Miata eBay Bilstein struts
Replies: 3
Views: 537

Re: How To Build Miata eBay Bilstein struts

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