longuyen88

iTrader: (7)

Here's how my DIYPNP looks so far after the basic assembly:



I have some questions based on the instructions.

1)Install all resistors in the locations marked on the board except R26 - the knock sensor trim pot, and R1 through R5. Note that you will have a couple extra resistors reserved for pull-ups. These can be used in the R1 through R5 positions or for certain other mods. - From instructions

I have a couple resisters left over. 5 1k pullups, 5 100 pullups, 3 470 pullups, and 1 ALT CAM 51k. Does that sound about right? I am especially wondering about the ALT CAM resister. I don't know where it goes


2) I also have a IAC FB diode left over. Where is it on the board and is it required?

3) If you are using the high current ignition outputs, add the “ENABLE” jumper next to each output you are using. - From instructions

- How does this apply to me? Does this have to do with the nonexistant Q1-4's?

When using LC1 WB, do you remove the stock o2 sensor or do you have to weld in a new o2 bung? Currently I still have the stock narrowband but I will buy the LC1 when it comes time to install.

I also have the sequential mod kit and GM AIT on the way.

Any tips/hints appreciated. I am trying to read through the mega manual.

Thanks, Long

Matt Cramer

Sounds about right - the ALT CAM resistor is only used on cars with VR cam sensors, which the Miata does not have.


Wire it into the IAC pullup, banded end to 12V.

It is for the nonexistant Q1-4. I will change the instructions to note this.

Generally best to put it in the turbo downpipe, at least 18" from the turbo.

turotufas

iTrader: (7)

Really? I didn't see that on the jumper configuration for 94-97. I just checked them and I see that for a 99 pull ups. I think I just found my problem.

longuyen88

iTrader: (7)

So it seems like I don't need any of the pull-up resisters besides the IAC pullup. Will put that in later.

My car is still stock right now (no turbo/SC until summer.) Should I weld an extra o2 bung next to the stock o2 sensor then? How will this integrate into the DIYPNP?

turotufas

iTrader: (7)

MS doesn't require a o2 sensor. Its just used for tuning. Just replace the factory with the wideband.
You need to install more pull ups. See here: DIYPNP MegaSquirt installation for the Mazda Miata

Matt Cramer

You need the pullups on Opto+ and VR2 as well.

turotufas

iTrader: (7)

So a 94-97 miata needs the IAC pullup?
I need to call you guys again.

richyvrlimited

iTrader: (1)

All 5's will need a pull up on the rpm input signals...

Ben

iTrader: (33)

Needs the flyback diode. I see that it's not listed in the Application Docs for 94-95 and 96-97. However, you do need to install it. Check the main board assembly instructions and scroll down to "assembly notes". You'll see the instructions for R5 for IAC pullup or flyback diode.

turotufas

iTrader: (7)

Ah I never went down that far. Thanks.

turotufas

iTrader: (7)

Damn I dont have any of the in4001's left. I don't want to pay $7 for shipping. Can I use these from radio shack?
1N4001 Micro 1A Diodes - RadioShack.com

Ben

iTrader: (33)

Yes, 1 amp is fine.

turotufas

iTrader: (7)

Thanks.

longuyen88

iTrader: (7)

So I finished building the DIYPNP for my 94. Two problems:

1) when connected to my computer, the rpm signal is way high. Like 65000 rpms. What's the issue here?

2) When I try to calibrate the tps, I get the same signal with the throttle closed and open. Key is obviously in the "on" position for this step.

My car runs perfect with the stock ecu, so I don't know if the TPS is the culprit or not.

Thanks!

longuyen88

iTrader: (7)

I resoldered the tps and vref joints on the board. I will also resolder the tach joints. Guess we'll see how it goes...

drsven

I had the same problem with DIYPNP in my 90 miata. In TunerStudio I disabled
Tacho output, problem solved

longuyen88

iTrader: (7)

Will try that, thanks! will the rpm speed still work with this off? any ill effects? I don't like to make changes to setting that I don't know.

Matt Cramer

Only '95 1/2 and later Miatas actually use the tach output from the ECU.

longuyen88

iTrader: (7)

I turned tach output off, and it's still reading 65,535 rpm when plugged into TS/MT. I don't know what the problem is?

Still need help on the tps calibration, will be calling diy soon....

AlexO35

iTrader: (7)

When you open MT, are you loading the latest msq? As well as having it loaded on the MS?

I've run into this data logging if I don't open the msq in MT first.

Have you verified your trigger inputs in MT are correct?
--Alex