Search found 934 matches

by Matt Cramer
Fri May 29, 2015 7:31 am
Forum: DIYAutoTune
Topic: Maxima COP Triggering
Replies: 16
Views: 5307

Re: Maxima COP Triggering

It could be that the way you built your circuit was feeding so much power to the coils that the voltage would dip unacceptably low. Try a 100 ohm resistor inline with the spark outputs.
by Matt Cramer
Tue May 19, 2015 10:50 am
Forum: DIYAutoTune
Topic: Knock Detection
Replies: 4
Views: 2165

Re: Knock Detection

The frequency is physically set in the hardware. However, there are several trim pots inside the MSPNP you need to adjust. See the MSPNP manual for details: http://www.megasquirtpnp.com/docs/mspnp ... &isModel=2
by Matt Cramer
Tue May 19, 2015 10:47 am
Forum: DIYAutoTune
Topic: Maxima COP Triggering
Replies: 16
Views: 5307

Re: Maxima COP Triggering

Going low vs going high refers to what the MegaSquirt is doing at the processor pins. Some output circuits reverse what actually happens to the signal by the time it makes it to the harness. The MegaSquirt CPU is not aware of what circuitry may be downstream of the processor pins.
by Matt Cramer
Fri May 15, 2015 6:24 am
Forum: DIYAutoTune
Topic: Knock Detection
Replies: 4
Views: 2165

Re: Knock Detection

There's two parts to the MSPNP knock circuit. 1. A headphone output that lets you listen to the filtered knock signal. It will show up as a high pitched almost beeping sound through the filter. Useful for tuning if your engine is knock limited. 2. The analog circuit that the ECU uses to pull timing....
by Matt Cramer
Fri May 15, 2015 6:20 am
Forum: DIYAutoTune
Topic: Maxima COP Triggering
Replies: 16
Views: 5307

Re: Maxima COP Triggering

That circuit needs to be set to going low.
by Matt Cramer
Fri May 08, 2015 7:18 am
Forum: DIYAutoTune
Topic: Maxima COP Triggering
Replies: 16
Views: 5307

Re: Maxima COP Triggering

The MSPNP is set up so that "Going high" means it sends a 0 volt signal when off and 5 volts when dwelling the coil. Some circuits in the MS1/Extra manual use the opposite logic.
by Matt Cramer
Wed Apr 29, 2015 7:35 am
Forum: DIYAutoTune
Topic: MS1 - hard/NO starts
Replies: 107
Views: 41128

Re: MS1 - hard/NO starts

This seems to mean to me that all of the ground pins connect to BOTH the main current grounds and the Sensor ground pin 7? So i'm guessing the purpose of the two planes is only for isolation of the high currents and digital grounds WITHIN the MS itself - how they can be isolated and connected at th...
by Matt Cramer
Tue Apr 21, 2015 7:03 am
Forum: DIYAutoTune
Topic: MS1 - hard/NO starts
Replies: 107
Views: 41128

Re: MS1 - hard/NO starts

Some general rules of 12 volt wiring: 1. You want the injectors to be on with the key on or from the fuel pump relay - Nissan has them on full time, which can be a problem with MegaSquirt because it wasn't designed for this. 2. The wires' inductance can mean the wires do a bit of noise filtering. An...
by Matt Cramer
Wed Apr 08, 2015 7:12 am
Forum: DIYAutoTune
Topic: Maxima COP Triggering
Replies: 16
Views: 5307

Re: Maxima COP Triggering

We are using a variant of the "5V pull up to fire" circuit that has been adapted to the MicroSquirt Module and has a 22 ohm resistor added inline to prevent killing the transistor if the output is shorted to ground.
by Matt Cramer
Tue Apr 07, 2015 7:34 am
Forum: DIYAutoTune
Topic: Maxima COP Triggering
Replies: 16
Views: 5307

Re: Maxima COP Triggering

As the MSPNP is based on the MicroSquirt Module, it does not quite fit any of these categories. Its output circuit is most closely related to the "5V Pull Up to Fire", but is not an exact match.
by Matt Cramer
Thu Apr 02, 2015 8:17 am
Forum: ECU Tuning
Topic: E85 Timing
Replies: 7
Views: 1565

Re: E85 Timing

This is very engine dependent. But when the VE drops after the torque peak, the cylinder filling is also less efficient. Less cylinder pressure will mean the engine wants more spark advance.
by Matt Cramer
Thu Apr 02, 2015 8:15 am
Forum: DIYAutoTune
Topic: Maxima COP Triggering
Replies: 16
Views: 5307

Re: Maxima COP Triggering

You will need to modify the ECU for two 5 volt logic level outputs.

http://www.msextra.com/doc/ms1extra/MS_ ... .htm#cop30

Either the "5V Pull Up to fire" or "Ground switching" mod on that page can work.
by Matt Cramer
Wed Mar 25, 2015 9:34 am
Forum: DIYAutoTune
Topic: mspnp2 fan control
Replies: 3
Views: 1549

Re: mspnp2 fan control

Can you check the resistance across the relay coil? Let me know what you find. It sounds like this relay needs a lot more current than a normal one.
by Matt Cramer
Wed Mar 25, 2015 9:32 am
Forum: DIYAutoTune
Topic: The MS3-Pro and MSPNP get a new home page
Replies: 0
Views: 1080

The MS3-Pro and MSPNP get a new home page

We've been planning a website overhaul, and the first step has been creating a new, high end home page for the high end section of our product lineup. Check it out here:

http://www.ms3pro.com/
by Matt Cramer
Fri Mar 13, 2015 6:16 am
Forum: DIYAutoTune
Topic: VSS input, has anyone here tried it yet?
Replies: 1
Views: 1247

Re: VSS input, has anyone here tried it yet?

I am using VSS input on my Chevy truck, bringing it in over CAN as I'm using a MicroSquirt to control the transmission. I'm not using direct input to the MS3, but that is supported too. I'd probably use an alternate second trigger input and bring the VSS in over the cam input VR conditioner.
by Matt Cramer
Thu Feb 26, 2015 8:03 am
Forum: KA-T.ORG FORUM ANNOUNCEMENTS AND NEWS
Topic: ***A 'THANK YOU' and Ownership Updates!***
Replies: 18
Views: 41388

Re: ***A 'THANK YOU' and Ownership Updates!***

I'm glad to see KA-T staying in the hands of enthusiasts. Big thanks to Rick and Ryan for running this, and good luck to Airman!
by Matt Cramer
Tue Jan 27, 2015 9:07 am
Forum: DIYAutoTune
Topic: jimstim/ms2 help
Replies: 5
Views: 1709

Re: jimstim/ms2 help

What brand of USB adapter are you using?
by Matt Cramer
Wed Jan 21, 2015 8:25 am
Forum: DIYAutoTune
Topic: jimstim/ms2 help
Replies: 5
Views: 1709

Re: jimstim/ms2 help

Are you using a USB cable or a direct serial connection? Also, what firmware are you using? I'll need to know these to get you pointed in the right direction. There is a file in the TunerStudio Projects folder called TunerStudioAppDebug.txt. You can email support at efianalytics dot com with a copy ...
by Matt Cramer
Tue Jan 13, 2015 8:24 am
Forum: DIYAutoTune
Topic: jimstim/ms2 help
Replies: 5
Views: 1709

Re: jimstim/ms2 help

One issue i seem to be having is connecting to the ms2 and jimstim is kinda loose. You need to apply a little pressure by hand to get everything to read via tunerstudio, because as of right now I cannot fit any bolts to connect the jimstim straight to the ms2. There just is not the space for it. Wo...
by Matt Cramer
Wed Nov 19, 2014 7:05 am
Forum: ECU Tuning
Topic: DIY ka24det Please assist!
Replies: 27
Views: 9647

Re: DIY ka24det Please assist!

Can you post a copy of the tune file and a data log of an attempted start?
by Matt Cramer
Mon Nov 17, 2014 7:35 am
Forum: KA-T Chat
Topic: Ka24e biuld
Replies: 3
Views: 1029

Re: Ka24e biuld

I'm a bit leery of no-name Chinese tubular turbo manifolds. Most of the ones I see out there tend to require re-welding on a monthly basis if the car is driven regularly.
by Matt Cramer
Wed Oct 29, 2014 7:12 am
Forum: DIYAutoTune
Topic: Another 95 pnp no start issue
Replies: 33
Views: 5960

Re: Another 95 pnp no start issue

I've sent him the paperwork to send it in for repairs.
by Matt Cramer
Wed Oct 29, 2014 7:11 am
Forum: KA-T Chat
Topic: Need ECU recommendations please
Replies: 61
Views: 8978

Re: Need ECU recommendations please

Does the MS3pro have integrated 4 channel EGT inputs? that would be badass! Sealed connectors that are appropriate for thermocouples aren't easy to find, so we instead came up with an external EGT module that supports 8 channels. http://www.diyautotune.com/catalog/images/canegt-c_med.jpg http://www...
by Matt Cramer
Wed Oct 29, 2014 7:05 am
Forum: ECU Tuning
Topic: DIY ka24det Please assist!
Replies: 27
Views: 9647

Re: DIY ka24det Please assist!

Spark output should be Going High.
by Matt Cramer
Tue Oct 21, 2014 6:05 am
Forum: DIYAutoTune
Topic: Another 95 pnp no start issue
Replies: 33
Views: 5960

Re: Another 95 pnp no start issue

Something is fishy. Can you check the MAP sensor output voltage at the "EXT MAP" jumper with the key on and engine off?

We never used the MPX4115 as a MAP sensor in the MSPNP line. It's only used as the baro sensor.
by Matt Cramer
Fri Oct 17, 2014 5:55 am
Forum: DIYAutoTune
Topic: Another 95 pnp no start issue
Replies: 33
Views: 5960

Re: Another 95 pnp no start issue

It needs to be loaded with the MSPNP firmware version, not the MicroSquirt Module version.
by Matt Cramer
Wed Oct 15, 2014 6:57 am
Forum: ECU Tuning
Topic: ECU tuning options KA24DET
Replies: 7
Views: 3461

Re: ECU tuning options KA24DET

$500 won't cover both a decent tuning solution and a wideband - I hope the wideband was a separate line item. We have a solder it yourself standalone kit called the DIYPNP that would completely replace the stock ECU and fit your budget, or for a bit more, you can get an MSPNP that plugs into the fac...
by Matt Cramer
Wed Oct 15, 2014 6:49 am
Forum: ECU Tuning
Topic: DIY ka24det Please assist!
Replies: 27
Views: 9647

Re: DIY ka24det Please assist!

Start with the MSPNP base map, scaled for your injectors, and swap the idle control from inverted to normal - that should be pretty close.
by Matt Cramer
Tue Oct 07, 2014 6:25 am
Forum: KA-T Chat
Topic: ms3 from scratch, no oem wiring
Replies: 10
Views: 1764

Re: ms3 from scratch, no oem wiring

ka240de wrote:where is it tied in with the chassis harness?
The MS wiring just needs constant power, switched power, ground, and a fuel pump connection to function. You would also want to wire up the tachometer to it.
by Matt Cramer
Wed Sep 24, 2014 6:55 am
Forum: DIYAutoTune
Topic: Wiring Hall Effect sensor?
Replies: 12
Views: 3772

Re: Wiring Hall Effect sensor?

The REF signal should go from 0 to 12 volts and back again. You may need to spin the distributor slowly to be able to see the individual pulses.