Miata megasquirt iacv. Please point out any errors I made (nicely!).

Miata megasquirt iacv My guides will cover what to order, what tools are required, how to build your megasquirt--all the way through installation and tuning. Feb 28, 2022 · I tried pulling fuel in the ve table and ASE as well as increasing the IAC valve duty% to either lessen fueling or get more air but nothing seems to effect anything in the first seconds of idle. Apr 23, 2011 · Hi guys. Nov 6, 2009 · FAQ Q. This site is dedicated to assist in the assembly of Plug-and-Play Megasquirt 3x and DIYPNP units for 1990-2005 Mazda Miata installs. Previously with my old injectors the car ran fine on the same megasquirt ecu. Just looking for some tips on idle tuning on megasquirt to maybe help with that if anyone here has any experience with it? I have been messing with the fuel VE table to try and reach my target Sep 9, 2014 · The IAC valve should "manage" the idle speed by changing the duty cycle if in closed loop or applying a certain number of duty cycles if in open loop. I tried with "valve frequency 2*30,5 Hz" and "Valve Mar 8, 2010 · IAC Valve NA (1990-1997) General DiscussionAll times are GMT -4. EXCEPT: Idle is really high. I'm a little unclear on whether you plan to run the stock 1. Below is the connector pinout to assist you to assemble your own wiring harness to allow seamless integration of these newer engines. Hi guys, I have megasquirt in my Miata, a basemap loaded, and a few settings changed. In the second and third diagrams this wiring is reversed. What is Megasquirt (MS)? A. Look into the Glen's garage idle board for the 3 wire valve boards. The big things affecting the tune are a m45 SC (with smaller SC pulley and larger Crank pulley overlay), Trackdog intercooler kit, injectors/fuel pump, Megasquirt 3 pro, and header/midpipe/exhaust. Aug 29, 2018 · Megasquirt 3 2ZZ-GE Progress Write Up & Diagram Repository I am in the process of wiring up a Megasquirt 3 patch harness for my wife's 2zzge swap for plug and play. The valve does change the revs but it's sky high If anyone could let us know their tuner Studio idle settings that would be It is however an aspect that is often overlooked or incorrectly tuned, leading to unstable idle and stalling. 1: Introduction The MS3X/V3. Re: PWM IAC Valve Voltage Miata (1991) by dontz125 » Sun Nov 20, 2016 8:48 pm You should see between 0-12v (or whatever your running VBatt is) depending on the commanded position. just wondering if this is a component i can eliminate in my build. You just add the O-ring style IAC valve with and wire it up. Ideal for stable cold starts and smooth idle with EFI systems. High Impedance injectors are available for the Miata up to 550cc which will handle most of your needs. I've tried many frequency settings, and the lower (sub 200 Hz) frequencies cause my IAC to make a noise at idle that sounds It has an M45 supercharger to which I recently added a Megasquirt PNP. Some details -MAP Sensor isn't used, since the Megasquirt deals with that business -Open loop tune, so doesn't use o2 sensor -IAC Valve is fine -Throttle body is fine -A/C Compressor is fine MegaSquirtPNP Plug-N-Play Standalone Engine Management Systems by DIYAutoTune. Are these lines necessary? If I start at the OEM thermostat and delete everything leading to the back of the head, what would happen? Feb 9, 2011 · just wondering if i can delete the IAC valve mounted to the throttle body on a 1. Running sequential injection. Car details: Mazda MX-5 Miata, 1996 European 1. Megasquirt is a fully programmable ECU then you build yourself (although some vendors will pre-build them for you) the best place to find out what MS is at the MegaSquirt webpage www. Sep 13, 2022 · Hi, So I tried bosch 2 wire style pwm valve already. the way your settings are setup it is telling to add fuel when it gets above 100. I've improved it quite a bit after much fiddling, but I still have three basic Megasquirt Boost Control Basics | Open-Loop PWM 3 Port Solenoid | How to Tune MegaSquirt TunerStudio Closed loop idle Tuning part1 Basic Idle Control and Fixing a Rolling/Hunting Idle Connector Pinouts for Engine Upgrades It has become common to upgrade Miatas' engine to those from newer model years. 8 MAF, the 1. 0) processor (I came from MS-1 HiRes Extra controlling fuel and spark) and I've unsuccessfully tried to setup my IAC valve. PWM Warmup mode works well and I can set idle with the valve at a fixed duty cycle at the end of the warmup map. Aug 15, 2013 · Hi, I have a Triumph Spitfire with a mazda mx5/miata supercharged engine. 0 specific installation details and should be used in conjunction with the general Megasquirt-3 Setting up and Megasquirt-3 TunerStudio reference manuals. IAC valve testing on an MegaSquirted NA8 NA (1990-1997) General Discussion Jul 23, 2025 · Most of the time, the throttle plate should not play a role in idle control on the Miata; the combination of the idle air bypass screw and IAC valve are all we want having an effect for consistent operation. Download the latest tuning software, firmware updates, and documentation for your MegaSquirt ECU or Transmission Controller. Been trying to fix this A/C issue. Running MS2 ECU. I watched the Jul 23, 2018 · Running Microsquirt, in a rockcrawler buggy (air intake is in the interior), with a Ford 5. My ms1 v3. I have ran them on a few toyota motors with great success. The IACV has coolant lines that lead to the oil filter and then from there off into the vast cosmos, apparently. 4 Mounting holes on the bottom/side depending on how you mount it with screws included. Now I added 640cc injectors and changed the required fuel to 4. The most fundamental parameters are in the 12×12 volumetric efficiency (VE) table (s), the 12×12 air/fuel ratio megasquirt base map running rough help ECUs, ECU Tuning and Programming > > > > Need Megasquirt tuning help PDA View Full Version : Need Megasquirt tuning help Trevor B 3rd May 2023, 11:09 Hi All, May 19, 2023 · Does anyone have frequency settings for NB IACV? Current settings have my car idling at 2400rpms. When the valve is plugged in it shoots up to 3,000 rpm. com Tuning involves setting all the parameters that the MegaSquirt-II™ (or MicroSquirt®) controller uses to be optimal for your non-pollution controlled engine, injection components, and driving style. Electrically, they are quite similar. May 23, 2013 · There is an issue with the MS2 variants driving the IAC valve. Tuning Idle MS3 - First steps & Info First off before you tune your Mar 8, 2010 · [NB] Alternator control, misfires during high elec loads when idling. 8 ECU into your 1. I tested three different valves and 91 all stock Miata IACV acting backwards in MS2. Jan 27, 2016 · I'm working on the wiring my GM IACV into my MS2 v3. Make sure the emitter (right-most pin) is wired to the correct spot. Sep 18, 2008 · Dang. Bottom line is, to get the drive frequency fast enough that the valve doesn't buzz, the tradeoff is that the control is rather coarse. Everything is turned up to 11 without being aggrivating to drive on the street. 0 is an ECU based on Megasquirt-3 technology, consisting internally of an MS3 card and an MS3X expansion card installed on a through-hole DIY V3. my car will be turbo and will be run with a megasquirt. Having idle troubles NA (1990-1997) General Discussion Jun 12, 2019 · Re: 90-93 Miata PNP Issues by rbrferrari » Fri Jun 14, 2019 12:32 pm I can take pictures to show you exactly how it's wired, but I have the 12V switched in the cabin footwell fusebox with a 5A fuse. Is there anyone out there having good results? I have had experience with MS2 on an old Miata with a GM stepper IACit never worked quite right and lost steps from So, does anyone have any ideas on what the hell could be wrong with my IACV? It’s not responding to input from the MS3, and as the picture illustrates, Dec 4, 2014 · Back to idle :) Rev2 of this is post is available - check it out - new and improved ! Closed Loop Idle - Overview CLI is a feature that intended to keep the idle steady and consistent regardless of internal/external physical conditions change. Pictures referenced will be added later, (tonight maybe). Struggling with idle issues? This guide shows how to tune idle speed in MegaSquirt, whether using open-loop or closed-loop control with IAC valves or throttle stops. When you change the injector size, MegaSquirt can handle most of the adjustments with just one variable, REQ_FUEL, which sets the base pulse width. What's all these versions? A. The car is freaking great, I love it. MegaSquirtPNP Plug-N-Play Standalone Engine Management Systems by DIYAutoTune. My idle is stable when I run it around 12 afr. 1 with a DIYPNP. Real time tuning and data logging with a laptop connection. 0l motor, perfect for idle control with the your MegaSquirt-II™ controller. I bought a self sealing silicon take off, like this one, and I had the intention of placing that in the 90 degree silicon bend at the TB and connecting the two together. com I'm chasing this annoying problem for a while now. Its pretty hard to control and tune, and my car can't really control the valve precisely to maintain my idle speed, it either too large or too small, make the car kinda surging. 0, using the Ford multiport injection, Ford IAC, Ford throttle body, etc. Coil 1 is wired to IAC1A and IAC1B and Coil 2 is wired to Jun 4, 2016 · I am not using a IAC valve so only way to adjust idle airflow is via idle set screw. Since 2004, DIYAutoTune. Supercharged with a Mazdaspeed supercharger (M45)~8psi. I have the ground going into the engine bay and grounded. If it works like a Toyota, the coolant lines will make the IAC give the motor more Learn how stepper idle air control (IAC) valves work and how to configure them in MegaSquirt. Dynamically changing Jul 10, 2015 · This is a work in progress, and quite wordy, if you want to use it, it's probably worth reading a few times in advance. But judging from the very different tuning requirements when setting one up to run on a Megasquirt, their dynamic characteristics seem quite different. A/W intercooler. Please point out any errors I made (nicely!). Innovate LC-1 wideband. Will Stepper version more precise to control by MS3X? Im looking at the jeep stepper version. com has been the trusted source for standalone engine management systems, EFI wiring solutions, and MegaSquirt ECU tuning support. (AFR, MAP, CLT, IAT etc') In order to control a changing conditions environment you need dynamically changing mechanisms. Mar 8, 2010 · Megasquirt idle issue ECUs, ECU Tuning and Programming I am busy tucking my bay and recently deleted my IACV (running Megasquirt). Jul 23, 2025 · Most of the time, the throttle plate should not play a role in idle control on the Miata; the combination of the idle air bypass screw and IAC valve are all we want having an effect for consistent operation. 2. There are different I'm curious as to whether you intend to drive the '99 IAC valve directly from a stock '90 ECU. Covers CAS tach input wiring, ECU mods, spark output options, dwell settings, and TunerStudio. I fitted and idle valve and we are having trouble getting it to idle properly. What I have found so far is if I don't keep the TB open fairly "wide" using the set screw, the car won't stay alive/idle after a warm start. 8 IAC valve (and throttle body), the 1. MS2 Extra 3. Im now trying to tune my idle. 6 ECU or if you're transplanting the 1. That way I don't forget Oct 17, 2004 · Hello, I am working on configuring my MS2/Extra system for my Porsche 2. In this webinar we’ll discuss what you need to know to get a rock solid idle, what hardware is required, and how to approach the tuning on the Megasquirt MS3Pro, TunerStudio software and a Mazda Miata/MX5. Map is between 28 and 30. We proudly design and manufacture all of our in-house brands — AMP EFI, MaxSpark Ignition, and Digital Dash EFI — at our facility in Gainesville, Georgia, USA. 6 car (in which case you'll need to move over the 1. [Archive] Megasquirt idle issue ECUs, ECU Tuning and Programming Using the forum Common forum questions Forum usage Contact Us MX-5 Miata Forum > NA/NB (1990-2005) Miata > NA/NB Power Mods > ECUs, ECU Tuning and Programming> Need Megasquirt tuning help Reply Thread Tools Display Modes 5th May 2023, 19:29 # 3 toolinalong Overdrive Join Date: Jan 2008 Location: Pensacola,florida Posts: 10,532 toolinalong . Feb 3, 2010 · Hello All, I have recently installed the MS-2 (release 2. I have a valve from another NA8 engine which I plugged in without actually installing on the car - but didn't seem to notice any movement of the valve when looking in the various orifices. Basically will be installing a turbo this winter but wanted to learn a bit about the tuning before Plug and play installation and no wiring required for basic functionality. I also have tested it by the new menu advance->idle valve test feature, but it doesn't move to anywhere. The time now is . 1. Learn how to MegaSquirt your Mazda Miata for full standalone fuel and ignition control. For the throttle body: Mar 11, 2011 · Hello all! So as not to sidetrack the firmware 3. I have blocked off the valve that increases airflow to idle during warmup (since Megasquirt can do that), and have given the IACV its own little air filter independent of the main inlet pipe. 0 mainboard. megasquirt. The MS reliably enters closed-loop idle when the throttle is released; however, I am ending up with oscillations. In the latest version of the Hardware and Wiring Guide (2016) there are three wiring diagrams. These include things like cold start pulse widths and acceleration enrichments. ECUs, ECU Tuning and Programming [NA] Megasquirt V2 Help ECUs, ECU Tuning and Programming For $800 you should be able to find a good used Megasquirt and parts to improve the engine. I am using MS2Extra 3. At this point, I could either use a PWM idle valve or a stepper motor style IAC motor. Stock 230cc injectors (for now), DIYPNP. A project car in the yard had a Megasquirt and a Greddy turbo with the IAC removed and blanked off with a plate. 8 IAT sensor, and all the other little emissions gizmos to keep the ECU happy. The way my piping is Mar 8, 2010 · Common forum questions Forum usage Contact Us MX-5 Miata Forum > NA/NB (1990-2005) Miata > NA/NB Power Mods > ECUs, ECU Tuning and Programming>[NA] 1992 MegaSquirt Erratic Idle Reply Page 1 of 2 1 2 > Thread Tools Display Modes 28th June 2017, 23:19 # 19 nintendoeats Second gear Join Date: Jun 2016 Location: London, Ontario Posts: 100 I can't compare its operation with how it ran previously - prior to the MegaSquirt install I had a Haltech E6A installed - which never used the IAC valve. 1, with the latest update from Jan 21, 2012 · I've setup closed-loop idle control for my 94 Miata similar to how Braineack and others have set theirs up [1]. 0 1997 e36 328is uses the same valve and it does what its supposed to do. The MSPNPPro has provisions to control all aspects of newer Miata engines including the alternator and VVT. When I try to lean out the fuel, the car starts hunting like crazy. Maybe buy another one, take the IAC out, ebay the rest, Profit! Or, strip the rest down, save the pieces for your Locost project that you'll MegaSquirt with a Chevy IAC anyway, sell the rest, Break Even and get a Locost. 6. you''ll want to adjust the tps settings afterwords. Base map pre-loaded to help your engine start first time. I tried with "valve frequency 2*30,5 Hz" and "Valve Idle Control Valve IACV Bosch 037906457D I'm searching the settings for TunerStudio for this valve. This manual covers MS3X/V3. Idle Control Valve IACV Bosch 037906457D I'm searching the settings for TunerStudio for this valve. I'm no Miata expert, but I saw one once. I thought the whole cars sold for $500-800. I started by identifying the X2,X3,X4 and X5 wires and the valve coils. x development thread with my individual issues, I decided to make this thread. The idle valve is a PWM type from a 1999 mx5. So basically I've never used the IAC valve before. I am assuming the reading you are getting are from the IAT MS3-Pro based MSPNP takes plug and play engine management to the next level! Easy to Use and Install! Base map pre-loaded to help your engine start first time. The first diagram, which matches my IACV, shows Coil 1 being wired to IAC2A and IAC2B and Coil 2 being wired to IAC1A and IAC1B. Upon start up the car revs up to close to 3k rpm, and then idles around 1300 rpms. 6L. The Microsquirt manual says Ford IAC valves work at 50-100 Hz, that Miata valves like closer to 300 Hz. So, I think it's about time to create a thread to post all my files and lessons learned as I go. For the throttle body: It is a custom machined aluminum IAC body for installing a IAC valve from a Jeep 4. Astroboy 29th June 2011, 12:02 Has Megasquirt PNP 2, so it's not like I can check any codes to see what's wrong with it. 7L six and I would like to use closed loop idle control in the future. Mar 8, 2010 · 99 IACV wiring (into a 90) NA/NB Power Mods Sep 1, 2009 · I like using the 3wire pwm valves from the 90's bmw. Any ideas? Mar 8, 2010 · Any help appreciated. com Q. I'm installing my turbo, and I ran into a wee problem with the idle air control valve pipe. I then have a signal output and signal ground going to pins 21 and 22 on the megasquirt. nbccd frn hwj yrhboem hbpp tmmdkn uqlzx rfkr vytlh wokwnkkb yfe bvxgut okak bqa jviiqh