Search found 145 matches

by Crazy Striker
Thu Apr 18, 2019 12:21 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Stupid me, I was powering the IAC through main relay output... No wonder why it isn't working. Will swap it in TS and see if it works
by Crazy Striker
Thu Apr 18, 2019 12:08 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

I have installed a flyback but I'm starting to wonder if it is correctly installed. Could not hear anything with the IAC test bench...
I tested the wires and they seem OK. Maybe the driver is dead ?
by Crazy Striker
Thu Apr 18, 2019 11:59 am
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

I'm working on the IAC circuit to verify if there are any shorts and then will film it 😉
Looks like the IAC is stuck open at 100%, which can enhance my starting issues
by Crazy Striker
Thu Apr 18, 2019 11:35 am
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Yes !!!! It finally started. 2 things were needed, inverting primary input and setting VVT trigger to falling edge instead of rising edge, as it is not possible to invert VVT input in software. The only issue I have is the car idling at 4500rpm, but at least it seems trigger is no longer a concern. ...
by Crazy Striker
Wed Apr 17, 2019 4:12 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

I tried with ignition angle of 10 and 15 degrees both with 6 and 8 ms of dwell, and with injector PW from 3 to 6, but no luck so far.
Is the 50% IAC PWM generic ? Car seemed more willing to start when blipping the throttle open
by Crazy Striker
Wed Apr 17, 2019 3:50 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Actual battery voltage was more close to 11.8 when mesured directly to it. I spent two days cranking on it, I think it's normal it is so low.
I've tried with 6.0ms and 8.0ms of dwell aslo but more or less the same result
by Crazy Striker
Wed Apr 17, 2019 3:44 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

I have tried with reverse sensors for trigger and the results are very encouraging. Car seemed to catch a bit but soon stopped. RPM sould have rise to 500-700 rpm during this phase. I was unable to register a succesful attempt but i've made a screen of a cranking in engine sniffer : 2019-04-17_15_13...
by Crazy Striker
Wed Apr 17, 2019 5:20 am
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

I will produce cleaner feedback today. May have a bottle left in da House for my carbureted Renault, I will try this too. Thanks
by Crazy Striker
Tue Apr 16, 2019 7:38 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

https://youtu.be/yva_zOCNAzU
RPM reads steady around 200-210 RPM during cranking
by Crazy Striker
Tue Apr 16, 2019 5:46 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

I checked all the wiring and used the NB2 preset. Got the car on the edge of running but not running. I tried to change some settings, as the cranking pulse duration and the cranking advance but I couldn't get it to work. Because I'm using the OPAMP, should I invert the inputs in the configuration o...
by Crazy Striker
Tue Apr 16, 2019 1:37 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Spark is working, injectors are working but I couldn't verify IAC is working.
by Crazy Striker
Tue Apr 16, 2019 1:20 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

First startup is not so right, I can only get some very very loud pops and the engine is sometimes definitely firing but I could not build enough revs.
Maybe my trigger offset needs to be configured.
I've tested with warm engine (88°C CLT and no more luck)
by Crazy Striker
Mon Apr 15, 2019 5:51 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Just received my MAP sensor, a Chinese knockoff Wichita seem of a good quality and the wideband signal. I also wired the baro sensor which is present on stock Miata (thought of using it as MAP but no need for it now). Tomorrow I will try to fire up the car for a first drive. I was wondering what flo...
by Crazy Striker
Sun Apr 14, 2019 2:34 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Yes I choose the NB2 preset in tunerstudio, just that I don't know which values are affected. For the Timing and VE tables I took them from a tune I found on the forum, but for the AFR target I used a generator which tend to be on the safe and rich side, and not tuned for economy X)
by Crazy Striker
Sun Apr 14, 2019 2:18 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Thank you very much.
I'm now looking for best config for first cranking.
You can find attached screenshots of many TS windows and the tune. What do you think of it. Have I missed something in the config ?
by Crazy Striker
Sat Apr 13, 2019 1:45 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

For the logic level jumpers on the high drivers side, which ones should I choose for the VVT miata ? Should I set all the drivers to 12V ?
Thanks !
by Crazy Striker
Fri Apr 12, 2019 11:21 am
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Ok so I remove the filter stage before the OPAMP.
Thank you very much ;)
by Crazy Striker
Fri Apr 12, 2019 10:22 am
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Input 9 and 11 are filtered to 100khz according to the schematics. I have 0.01uF for both filters and 100 ohms. Maybe should I use 0.0022uF for these as this would raise filter knee to 400khz approx.
by Crazy Striker
Fri Apr 12, 2019 8:47 am
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Yes !!!
I have trigger signal and RPM showing during cranking :D :D :D

So happy now thank you !
by Crazy Striker
Fri Apr 12, 2019 5:34 am
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Ok so in order to use the opamps : I connect the cam and crank signal to analog inputs 9 and 11. The output of 9 and 11 channels have a jumper which normally connect them to PA7 and PC4. I do not populate the jumper but I use a wire going from their opamps side to the Cam and Crank inputs on the dis...
by Crazy Striker
Thu Apr 11, 2019 8:22 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

So what works so far : Power to ECU Communication with computer (TS and Dev console) Analog inputs : IAT, CLT, TPS I did not plug the outputs yet. Could not get the crank sensor and cam sensor to work through the MAX chip. Tried to connect it after the max chip, did not work. Will try tomorrow morni...
by Crazy Striker
Thu Apr 11, 2019 6:46 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Maybe should I power the main relay. I don't know if it works
by Crazy Striker
Thu Apr 11, 2019 6:06 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Tried it directly connected to the board, no more luck with a signal. With the engine sniffer I can't pick up anything when cranking.
by Crazy Striker
Thu Apr 11, 2019 5:21 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Cam and crank sensor are powered by 12v but their output oscillate between 0 and 5 so it should be okay then
by Crazy Striker
Thu Apr 11, 2019 5:11 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

I have a problem. My crank and cam was not working when tested on the car. Trying to solve the problem I burned tracks on the board where the VR/HALL chip goes. 1555002519666775724994679392024.jpg I think it will be possible to wire the hall inputs directly to the board without this Chip, am I wrong...
by Crazy Striker
Wed Apr 10, 2019 5:49 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

I don't know why but my ECU is located under my passenger side footwell, behind a metal plate. I'm pretty happy with that since there is a lot of extra room there for any kind of electronics and for an adapter board. My stock install should be pretty similar to this. It's a picture taken on a 2003 V...
by Crazy Striker
Wed Apr 10, 2019 8:03 am
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

Yes you're right, it's one of my bad habits X)
Do you have a safe base tune to start my engine. I have found one in the forum for the VVT engine but I'm not sure about the good health of my motor.
by Crazy Striker
Tue Apr 09, 2019 9:42 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

I did not populate
LEDs, should I ? My multimeter is quite slow to react it may just be that and not a real problem
by Crazy Striker
Tue Apr 09, 2019 6:49 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

I've just tested the low impedance outputs with my multimeter.
I have no problem getting a beep on the fan relay command but i'm unable to get continuity with the injectors output.
Maybe I was wrong on my test points but seems weird to me.
Do you have any advice to solve this issue ?
Thanks
by Crazy Striker
Tue Apr 09, 2019 4:08 pm
Forum: You and your build
Topic: 2004 Mazda MX5 1.8 VVT #50
Replies: 169
Views: 132360

Re: 2004 Mazda MX5 1.8 VVT

I "stole" 7x1.2 meters (4 feet for our fellow Americans) of 4 core 0.5mm2 (20 AWG) industrial cable. Fire retardant and 80°c rating. I will try to find 7 meters of lower gauge (18 1/2 or 0.75mm2) for power rails and ground. I will solder the harness on Thursday afternoon and try it out aft...