Yank's brick with MS3X (Noob tuner FTL)
 

Ill keep my tuning related issues in this section.

For reference. Build Thread.
https://www.miataturbo.net/build-threads-57/build-thread-fe3-rx7-tii-efr-6258-ms3-58140/

Finished assembling the MS3 main board earlier this year after i put together the jimstim v1.5. tested it out the best i know how and it looks as though things are functioning properly. (i turn the knobs on the stim and the gauges on my screen move.)
https://www.miataturbo.net/attachmen...ine=1321750563

I pulled the stepper style ICV off my car today which came from a jeep grand cherokee 4L and hooked it up to the stim to make sure it works and it looks as though it is also working. Its not very smooth though. probably adjusts 3 or 4 times from CLT pot full off to full on.

Currently not working. (i could be hooking it up wrong) is the throttle position sensor. I made reference to this link via google search..
http://townhall-talk.edmunds.com/dir...w/.f0f8b2b/677
Valid info being...
*****Throttle Position Sensor - check voltage across the (+) wire (Purple/white) and the (-) wire (black/blue). Voltage should be 5.0 volts. Next check signal voltage across the (+) wire (orange/blue) and ground. It should be 0.5 volts. Move the throttle to a fully open position and voltage should increase to 4.5 - 5.0 volts*****

So i hooked up the 3 wires to a 5 volt source on the stim, the ground to ground and the orange /blue (mine is actually Green /red or i'm color blind) to the TPS screw down input. took measurements from ground to make sure i had 5v and also from the TPS input. The 5V checked out fine but the TPS measured 3mV when closed and 12.8mV when full open.
I tried to calibrate it at these low voltage outputs but its way to sensitive to register a gradual change. Any ideas on why this isnt working?

Im also looking for a base tune to start playing with. MS2 or MS3 will work from what i understand. I realize our engines and setups are completely different but i have to start somewhere. I plan on starting out with around 8 to 10 psi to start out. Im also wired for sequential fuel and spark so if its already set up then great, if not i can figure out that bit. Shoot me a PM if you have something i can use.

Thanks guys!

Any ideas on a troubleshooting process for the TPS?

Anyone have a safe tune for me to start from?
Im hearing 20 degrees of ignition and less than 12 psi.
I just have to get this thing started safe so VE analyze live can take over.

Thanks.

switched the source and signal wires going to the stim. getting 3.21V at 0% and 4.18V at 100% throttle. calibrated the TPS in tuner studio and it gave me a nice smooth sweep at this voltage difference.

Still looking for a MS2 or MS3 tune to start from. I'm pretty sure i'm not going to be able to start this thing with whatever is loaded on it initially.. Please.

PM Brainy, he might be able to help.

Every time i talk to the Brain i leave feeling retarded. :facepalm: He seriously has to be annoyed by all the dumb questions i've asked him so far. It may come down to this though.

He has literally offered to "hold my had" through my MS3X build, other members have told me that he has been very patient with there indecisiveness. If you feel bad asking a bunch of questions ask him what his favorite charity is and donate to it.

My favorite charity is my paypal account.

You could fix his BF3 game for him.

Ha! No joke if you get me a tune that starts my car and get me pushed off in the right direction using VE Analyze live id be more than happy to give you something for your time.

Honestly man there are a ton of spark tables and AFR tables that have been posted here over time, and if you dig, in addition to those you might just find some maps.

I found thirdgen's old AFR table and a few spark tables.. im sure i can find a fuel load one too (good old google search) but the values of this would completely depend on fuel pressure and injector size. What all do i need AFR target, Spark, fuel load,...? I just need to sit down and spend some serious time researching and exploring tuner studio. its hard to devote time to this right now when the car isn't all the way put together though.

Question for megasquirt guys. is sensor ground the same as signal ground. both the datalog switch and the launch control switch call for a signal ground from the megasquirt. I know my sensor ground is pin 19 i just need to know if its the same thing.

A ground is a ground is a ground.

HOWEVER, typically you try to keep the sensitive low current devices (sensors) grounded separate from the high current stuff (starter, fans, pumps etc)

I would agrue on the ground thing I've seen difference in voltage from using various grounds, also there is reasons certain devices want two grounds done for reference reasons.
Personally if its calling for a sensor ground, I would run it to a sensor ground wire from the harness.

yank for the fuel whats your injector size and type, for spark table you could probably just uses diyautotunes ms2 base spark map and interoplate to 16x16 cells

Perhaps, but if you read 3 different megasquirt guides/pinouts, you'll find 3 different ground schemes, and they all pretty much work interchangeably. I'm not a 'squirt wizard but that leads me to believe there is a common ground bus to the ECU

This is also what i hear. I'm going to ground the LC-1 O2 sensor to pin 19 for sure but i'm going to wait to hear from Ben from DIY autotune on the switches tomorrow. the momentary switch should be a digital signal not a variable / analog signal like the output of most sensors. this is why i question grounding it to the sensor ground.

Techsalvager thanks for the help! injectors are ID1000s, fuel pump is highflowperformance 255LPH, FPR is a FueLab 52501. Let me know what i should set my fuel pressure at to start out. Ill check the spark map you're referencing and do the interpolation. (Learned to interpolate in my thermo II class last year. haha putting that college education to use.)

Back to the garage. :)

wait a sec. Dude that's the purpose of REQ fuel in the software. So you can change injectors and fuel pressure and not have to start over.

If you configure your injector cc and psi, the req fuel value will change and should scale your fuel map to be equal. It won't be spot on, but should be close enough that you can sort it.

I have absolutely 0 empirical evidence to support this, but I like to run higher than typical fuel pressure, hoping that it makes atomization mo-betta. Plus it gives your injectors more headroom, which should not be a factor for you.

Industry standard is 43.5psi. I usually go for 80 if you have a pump that can handle it.

FYI answer from Ben Berusch of DIY Autotune

Sounds like the switches for sure go to sensor ground. Ill make this run today when i get off work. Last night I finished running all the wires to the mocked up switch panel seen in my build thread. Things are moving along nicely wiring wise. Hopefully Ill have this thing running by this weekend / next week assuming i can get the tune sorted out.

Thanks for the help everyone!