[rusEfi] Hunchback 1991 Miata NA/NB2 rusEfi official racecar #20

What engine are you torturing? Is it inside some car?
Post Reply
User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Hunchback 1991 Miata NA/NB2 rusEfi official racecar #20

Post by russian » Wed Jul 29, 2015 2:25 am

Because I need my own race car.

Image

"was in accident, run when parked"

http://rusefi.com/wiki/index.php?title= ... Miata_1990

==========================================
base tune as engine config code https://svn.code.sf.net/p/rusefi/code/t ... ta_1_6.cpp
Frankenso 0.4 board
http://rusefi.com/images/Frankenso/fran ... _front.jpg
http://rusefi.com/images/Frankenso/fran ... k_back.jpg
==========================================
dashboard/logging ECU:
max9926 input no pull-downs and no pull-ups
MAF/VAF 3O W53 no pull-down and no pull-up
IAT 3P W54 no pull-down and no pull-up (stock ECU R421 2.7K pull-up to +5v)
CLT 3Q W55 no pull-down and no pull-up (stock ECU R431 2.7K pull-up to +5v)
TPS 3M W50 no pull-down and no pull-up

Wiring info - viewtopic.php?f=3&t=906&p=25018#p25018
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
kb1gtt
contributor
contributor
Posts: 3407
Joined: Tue Sep 10, 2013 1:42 am
Location: ME of USA
Contact:

Re: 1991 Miata

Post by kb1gtt » Wed Jul 29, 2015 2:43 am

Cool, let me know if you need help with it electrically. Does this have that valve that needs to be activated for high RPM?
Welcome to the friendlier side of internet crazy :)

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Wed Jul 29, 2015 2:46 am

kb1gtt wrote:Does this have that valve that needs to be activated for high RPM?
I believe it does not have VICS yet - not the 99+ 1.8 engine

[video][/video]
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

Abricos
contributor
contributor
Posts: 699
Joined: Mon Aug 18, 2014 12:32 am

Re: 1991 Miata

Post by Abricos » Thu Jul 30, 2015 2:17 am

Wow congratulations ...
Good luck with the recovery engine ...)))

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Sat Aug 01, 2015 8:12 pm

That's a $10 'Mini 5M 4LED USB Waterproof Endoscope Borescope Snake Inspection Video Camera'

[video][/video]
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
kb1gtt
contributor
contributor
Posts: 3407
Joined: Tue Sep 10, 2013 1:42 am
Location: ME of USA
Contact:

Re: 1991 Miata

Post by kb1gtt » Sat Aug 01, 2015 9:26 pm

That looks like mostly good news on the inside. Doesn't seem to have much for carbon build up. Is that an oily residue? Does it have good compression? Did you get to see the side walls? Any how how could you post such a boring video :)
Welcome to the friendlier side of internet crazy :)

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Mon Aug 24, 2015 3:14 pm

[video][/video]

Image

Wonder how low they want idle? this is stock ECU obviously.

Note how idle was lower when I started it, but would not go down after I rev the car a bit:

[video][/video]
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Wed Sep 30, 2015 8:45 pm

Plot twist: I've got an AUTO miata with a light hit in the rear quarter for engine donor and now I am hesitating if I want to swap the engine into the red car and scrap the perfectly fine green body, or if I want to convert the perfectly fine green car to manual.

Both cars are pretty much rust free.
Arguments for red car:
it's already registered
alignment is fine & suspension is tight
manual swap is extra effort, who knows what crazy auto heritage would bite me when
I like red color more then this dark depressing green

Arguments for green car:
front is perfectly straight

Image

I will be busy parting one of these cars out for a couple of weeks - I need to junk on of these shells to get the test mule neon back into my tiny garage.
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Sun Oct 04, 2015 7:06 pm

Still has not decide which shell I go with

Image
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Mon Nov 23, 2015 3:18 pm

Green car is now manual, red car is gone. rusEfi promo car is coming along!

Image

Image
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
RasPL
Posts: 24
Joined: Thu Oct 15, 2015 6:44 pm
Location: Poland

Re: 1991 Miata

Post by RasPL » Mon Nov 23, 2015 6:14 pm

about 1000bhp promo car ? :mrgreen:

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Mon Nov 23, 2015 6:21 pm

RasPL wrote:about 1000bhp promo car ? :mrgreen:
Closer to 100 to begin with...
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
kb1gtt
contributor
contributor
Posts: 3407
Joined: Tue Sep 10, 2013 1:42 am
Location: ME of USA
Contact:

Re: 1991 Miata

Post by kb1gtt » Mon Nov 23, 2015 10:38 pm

100,000mbhp sounds cooler :)
Welcome to the friendlier side of internet crazy :)

Abricos
contributor
contributor
Posts: 699
Joined: Mon Aug 18, 2014 12:32 am

Re: 1991 Miata

Post by Abricos » Tue Nov 24, 2015 1:08 am

power by pedal ...

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Sun Dec 13, 2015 3:34 am

Next step: finding what kind of flange it is so that I can try welding a maniforl. Flange pattern is about 75mm by 57mm. I believe I've removed it from a 2nd generation Eclipse couple years ago.

It says A/R.48 M24 internet says it's T25 or T28

Image
Image
Image
Image
Image
Image
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Sun Dec 13, 2015 3:46 am

http://www.ebay.com/itm/DSM-1G-2G-16G-2 ... 1155898917 calls it TD05 Bolt Spacing: 2.25" x 2.52" (57mm x 74mm) but they've failed to convert mm to inches LOL

http://www.enginebasics.com/Advanced%20 ... 20Pg3.html confirms
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

Abricos
contributor
contributor
Posts: 699
Joined: Mon Aug 18, 2014 12:32 am

Re: 1991 Miata

Post by Abricos » Sun Dec 13, 2015 4:53 am


User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Tue Jan 19, 2016 5:33 pm

Hood/trunk pins installed - it's a true race car now :)

Just dropped it to be caged, I would not see it again until mid-Feb probably.

Image
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
kb1gtt
contributor
contributor
Posts: 3407
Joined: Tue Sep 10, 2013 1:42 am
Location: ME of USA
Contact:

Re: 1991 Miata

Post by kb1gtt » Tue Jan 19, 2016 5:59 pm

It's about time you caged that beast. As we know people get hurt when beasts like that aren't caged :)
Welcome to the friendlier side of internet crazy :)

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Sun Feb 14, 2016 11:50 pm

Not complete but you get the idea.
Attachments
2016-02-14 17.05.30.jpg
2016-02-14 17.05.30.jpg (2.66 MiB) Viewed 7256 times
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Tue Feb 23, 2016 5:24 pm

And that's the plan for the lemons theme.
Attachments
20160223_101043.jpg
20160223_101043.jpg (223.68 KiB) Viewed 7199 times
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Fri Feb 26, 2016 3:55 am

12 things done / 28 things on the TODO list. Building this car would consume a portion of my time between now and first race in May.
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

stefanst
contributor
contributor
Posts: 540
Joined: Wed Feb 17, 2016 12:24 am

Re: 1991 Miata

Post by stefanst » Sun Mar 20, 2016 9:50 pm

Any progress reports/pictures?

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Mon Mar 21, 2016 6:43 am

New engine runs, need to convert auto harness to use manual ECU with manual TB since we are using OEM manual ECU for the first race.
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

tomiata
contributor
contributor
Posts: 231
Joined: Sat Aug 02, 2014 2:30 am
Location: Texas

Re: 1991 Miata

Post by tomiata » Sun Mar 27, 2016 9:16 pm

What engine did you end up with, a 1.6 or 1.8?

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Wed Apr 20, 2016 1:22 am

The green car is now made of two 1991 cars so it's a 1.6

[video][/video]

Would anyone by any chance know how do I decode the signal on the oil pressure gauge wire? does the sender change resistance, like a thermistor? gauge pull-up resistor value? is anything linear here? is there a magic table somewhere maybe?

Image

Some info on 1999+ later oil pressure gauge (mine is 1991, better OEM design with true sensor, not just a switch):

http://wiki.miata.net/tiki-index.php?pa ... real+gauge
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

stefanst
contributor
contributor
Posts: 540
Joined: Wed Feb 17, 2016 12:24 am

Re: 1991 Miata

Post by stefanst » Thu Apr 21, 2016 2:58 pm

It's a real pressure transducer- meaning it changes resistance with pressure. This behavior will not be linear. I have never seen a calibration curve for it though.
I assume you want to read it with the Rusefi. Just hook up a series resistor - something between 10Ohm and 330Ohm would probably be OK. Make it at least 1/4W. Run it off stabilized 5V, not 12V: 5V/100Ohm = 50mA. 50mA x 5V = 250mW. So a 1/4W should do fine. Make sure it gets some airflow though!

Read the signal with an analog input. Value without the engine running is 0bar. Value with engine running, cold oil and rpm>>idle is maybe 5bar? Absolute values don't really matter. All you need to keep an eye on is values significantly below what is expected.

User avatar
russian
Site Admin
Posts: 9521
Joined: Wed Aug 28, 2013 1:28 am
Location: Jersey City
Soldering skill: yes
Coding skill?: yes
Contact:

Re: 1991 Miata

Post by russian » Thu Apr 21, 2016 3:17 pm

Yes I want to read the value by rusEfi but I also want too keep the OEM gauge working! The gauge is pulling to +12v and I can only read up to +5v.Would it be possible to add a divider into the OEM circuitry without messing it up, or is it only possible if I use an op-amp to isolate?
https://rusefi.com/s/howtocontribute
very limited telepathic abilities - please post logs & tunes where appropriate - http://rusefi.com/s/questions
my skype is arro239

stefanst
contributor
contributor
Posts: 540
Joined: Wed Feb 17, 2016 12:24 am

Re: 1991 Miata

Post by stefanst » Thu Apr 21, 2016 6:09 pm

You can use a divider. Go fairly high resistance, maybe 2.2K and 1K, and you won't distort the signal to the OEM gauge much.

User avatar
kb1gtt
contributor
contributor
Posts: 3407
Joined: Tue Sep 10, 2013 1:42 am
Location: ME of USA
Contact:

Re: 1991 Miata

Post by kb1gtt » Thu Apr 21, 2016 11:11 pm

Because your 12V will be changing, to get accurate readings, you'll need to reference the 12V signal and keep in mind the signals are ratio-metric. If your base line voltage is say 14.4V, and your actual voltage is 12V, your 83% of the full signal. Then your 5V signal will also be 83% of the real signal. You'll have to compensate by multiplying your measured pressure by 1.20 too get the real pressure. Probably best to consider something like 18V to be the base line, such that you have some room if you go over voltage for a short bit of time. Or perhaps with floating point it doesn't matter. I'm thinking that if your base line is 14.4, and you alternator over shoots to 15.0, you could have some potential math problems. However with floating point perhaps it wouldn't care. Any how, key point I'm trying to make is that you'll need to consider the 12V signal as part of your algo for determining the pressure.
Welcome to the friendlier side of internet crazy :)

Post Reply