Megasquirt

[Bender]

I tripped across some thread about megasquirt, and was wondering how the new versions are? I read that the first chip could control spark on dsms, but it was unclear if the new one would. Well, it's been a while, and I am wondering if anyone knows if it will? Here are some questions I have before I look into it further.

• Will the new chip control spark on the 4G63T?
• If I was using methanol injection, would the injector go before or after the air temp sensor?
• How well does the boost control work on the new version, and how high does it go up to?
• Does it have good injector compensation?
• Do I need a wideband 02?
• Basically, I'm looking to run a GT3582R / GT4088R and was wondering how good of a tuner it is, as well with how good the options are

I am sure more questions will come later on as I research it more. Thanks for your time, and personal experience is highly grateful.

[turboglenn]

I've replaced 2 of the older versions on cars where they couldn't get consistant A/F's out of their cars. I replaced them with autronic SM-2's.( one DSM and one Alph Rame). However, i've seen a few cars locally that are running great on MS's. The crank sensors on our cars ( more especially teh 1g CAS's ) are so easy that just about anythign should be able to pick up the signal and use it. I've been thinking about getting on the meghasquirt fad since the newer versions seem so much more impressive.

I got a few links from a guy on here and there's instructions for wiring it up to a 4g63t so i'm going to have to say YES it will control our ignitions. Go to diyautotune and rs autosport ( google them , that's what i did) and you'll come upon a wealth of megasquirt info.

You can even get them prebuilt for around 400 bucks or so... not a bad deal IMO. That's where the SDSEFI systems should be priced but they are 900 and up for something with way less flexability.

EDIT: and to finsih answering your questions

1,) it looks like they should be able to control just about any size/impedance injector

2.) yes, a wideband is a MUST for proper tuning, although you could get it ballparked on a stock style narrow band

3.)Not sure about your methi injection questions, i'm just looking into that for myself.

4.) Unsure about the boost control also, but i would believe it would be just fine, cycling a solenoid at 30 - 40 hz is easy for simple circuitry.

[Ajax]

Just to let you know with megaswuirt you will need patience, If you look on the MSx/Extra EFI :: Index forum there is a whole thread about MS2 and the 4g63 motor that should answer most of your questions. It's defiantly is a great system and I am running one but on a 420a It's great in the sense of I learned so much from doing everything myself but i have had mine installed for 4 months and I am still working out some issues but for the price and support you cannot beat it! There is also a program that you can download called megalog viewer that contains a VE analysis which is a great tool for tuning!

[PapioGXL]

Originally Posted by Bender

I tripped across some thread about megasquirt, and was wondering how the new versions are? I read that the first chip could control spark on dsms, but it was unclear if the new one would. Well, it's been a while, and I am wondering if anyone knows if it will? Here are some questions I have before I look into it further.

• Will the new chip control spark on the 4G63T?
• If I was using methanol injection, would the injector go before or after the air temp sensor?
• How well does the boost control work on the new version, and how high does it go up to?
• Does it have good injector compensation?
• Do I need a wideband 02?
• Basically, I'm looking to run a GT3582R / GT4088R and was wondering how good of a tuner it is, as well with how good the options are

I am sure more questions will come later on as I research it more. Thanks for your time, and personal experience is highly grateful.

This is just from my own research for my car, but I also have experience with Megasquirt from my RX-7.

1.Yes, the MS-II chip now can control the 4g63T's spark, along with it's idle air control valve (IAC).

2.The nozzle can go either before or after, but best results would be before (and I've heard good things of preturbine injection too)

3. From what I have heard, boost control works pretty decent, but probably won't be too effective above twice the wastegate spring pressure. Also the MAPdaddy 4 bar sensor would be a worthwhile upgrade, as it has a constant barometric correction (good for long mountain runs) and also can read approx. 45 pounds of boost.

4. It can control any injector you want with good precision. It also has an anti-flyback board for low impedance injectors, so there is no need for the resistor anymore. It even has injector staging if you want a decent idle with small injectors, then at full power have 1680cc's come online. Or even dual table for different fuels.

5.A wideband is HIGHLY recommended for tuning it. It isn't too much more expensive and will save you from leaning it out too much in boost. It also allows awesome cruising AFR control for efficiency.

6. It is a very capable standalone EMS, with a strong community. Instead of calling a hotline, you can post on msefi.com and get an answer from the developers, and anyone who has had your problem before. There are also several outputs that can be used for things like nitrous control (3 ranges must be met to enable, and it can also add fuel like a wet shot), antilag (including nitrous antilag if N2O and a-l are on), overboost protection, traction control, IAT controlled boost, 2 6x6 boost target tables, water injection control, and a few more things. Note: a few of these can't be used together, and these are from MSI, so I'm not entirely sure how many transfer to MSII, but I'd imagine most would.

EDIT: MSII and a 4g CAS link: MS2-Extra Miata 4g63 Manual So yes it will work

[1gnasty]

there is a few guys in my area with turbo mustang that run mid 9 on street tires, they are using Megasquirt and they have been very successful with it, then againg that is all i know about that system

[Bender]

First off, thank you for the information and links. They are all very helpful and appreciated. Also, is there a way to tell knock points with megasquirt? And is there means to control timing?

[PapioGXL]

Originally Posted by Bender

First off, thank you for the information and links. They are all very helpful and appreciated. Also, is there a way to tell knock points with megasquirt? And is there means to control timing?

Yes on both counts. For info on knock click here: MS2-Extra Hardware Manual if you scroll down a bit, it shows which outputs are possible to be used in combination with each other.

The link I posted in my last post shows the wiring for spark control.

[Ajax]

Here is the kink to the knocksense I use with my MS Engine knock detection and indication for all vehicles