Megasquirt 2.0/2.4

[contraption22]

I thought I would start a thread for megasquirt information specific to the 2.0/2.4 engines.

Feel free to post your questions, answers, setups, tips, tricks etc. here. I'm hoping to learn as much as I can.

[A.J.]

AZ Shadow has it on his 8v and I'm installing it on my 2.4, so between the two of us we ought to be able to answer any questions. We both got the MS3 w/MS3X. He's running batch fire fuel injection with individual coils and I'm running sequential fuel injection with the waste spark factory coil. I've been trying to get it started for the past two days. I made some wiring errors but that's all worked out. Now it won't start but it sounds like a timing/programing issue. It sounds like I need to turn the distributor to get it to start but I don't have one so I just have to adjust the cal. Lots of features/options in Tuner Studio, the software to program MS. I'm really excited about all the options available in there.

[contraption22]

Thanks, AJ.

Keep us updated!

Looks like from what you and DJ are telling me is that I will still need the resistor board for low impedance injectors even with the MS3X.

[Pat]

Subscribed...very interested in this also.

[A.J.]

You don't want a resistor board, you want the Peak & Hold driver http://www.jbperf.com/p&h_board/v2_0_1.html. You technically don't NEED it if you fire your low z injectors batch fire, only sequentially. But it wouldn't hurt to get it for batch fire. Also keep in mind the board comes as a kit, you have to assemble it. It's a little intimidating at first but the instructions are clear and there is a way to test it when you're done to make sure you did it right.

[turboshad]

You should really look into this Mike. If you aren't comfortable assembling it just ship it to me and I'll do it for you. This way you can run your Low Z injectors properly in batch or be ready to go sequential if you can't get those big boys to idle.

http://jbperf.com/p&h_board/v2_0_1.html#Buy


EDIT: Post ninjaed by AJ

[turbo2point2]

Mike, do you have injectors already? Might be worth it to start with high impedance if not.

[turboshad]

The IDs are high Z aren't they?

[contraption22]

http://tapatalk.imageshack.com/v2/14/10/16/20c85c06d215ee59c19f4fccb3a253d0.jpg

I have these sitting on my desk. They are 1000cc high impedance from AUS injection.

I was thinking of going with low impedance for the faster reaction and idle quality, and probably go for something bigger than these.

I've seen 1200cc low impedance Delphi's for as low as $55 each

[A.J.]

Mike, do you have injectors already? Might be worth it to start with high impedance if not.

That was my situation. I already had the low z 120's. So it was either buy and assemble the $95 driver or spend $800 on high z injectors. I opted for the the $95 and assembling the board was actually fun. When I got done I was like, "Maybe I should have saved some money and built my own MS."

[contraption22]

You should really look into this Mike. If you aren't comfortable assembling it just ship it to me and I'll do it for you. This way you can run your Low Z injectors properly in batch or be ready to go sequential if you can't get those big boys to idle.

http://jbperf.com/p&h_board/v2_0_1.html#Buy


EDIT: Post ninjaed by AJ

Sorry, Thats what I meant when I was referring to the resistor board. Thanks!

- - - Updated - - -


That was my situation. I already had the low z 120's. So it was either buy and assemble the $95 driver or spend $800 on high z injectors. I opted for the the $95 and assembling the board was actually fun. When I got done I was like, "Maybe I should have saved some money and built my own MS."

I am pretty much starting from a clean slate. I currently have 83lb injectors, and I know they will not be big enough for my goals, so I think I am buying injectors no matter what.

[contraption22]

The IDs are high Z aren't they?

Brian and I talked about those. They offer response as-good or better than historically found in Low Z injectors but are a high Z injector.

[turboshad]

Here is a link to my Tuner Studio project file if it ever helps someone.

2.4l 420A, 8.5:1 CR, 1200cc inj., sequential injection and LS2 truck coils, LC, table switch, fan control
VE and Spark 1 are for 91 octane, VE and Spark 3 are for 118 leaded.

https://www.dropbox.com/s/euiah6wko1406yn/1993%20Shadow.zip?dl=0

[contraption22]

Thank you DJ

[A.J.]

So Mike, do you plan on running sequential fuel injection or batch fire? Are you going to run a single coil, waste spark (like the T-III or 2.0/2.4), or coil on plug? What engine are you putting this on?

[contraption22]

So Mike, do you plan on running sequential fuel injection or batch fire? Are you going to run a single coil, waste spark (like the T-III or 2.0/2.4), or coil on plug? What engine are you putting this on?

This is going on my 2.4, I'm planning to run sequential injection and wasted spark with a stock 2.4 coil, although I will have the option of using COP or CNP.

[A.J.]

Is it an SRT-4 2.4? If so you'll be able to use whatever base cal I come up with and it'll save you the aggravation I'm going through now. Are you still going to go with the high z injectors?

[contraption22]

Thanks for the offer! I am using an early block and am planning to use DJ's file for a base cal. I am planning to use the high-z injectors.

[contraption22]

AJ,

Do you have a reliable quadspark diagram? The instructions on DIY autotune seem to show 4 inputs and 4 outputs.

Thanks!

[A.J.]

AJ,

Do you have a reliable quadspark diagram? The instructions on DIY autotune seem to show 4 inputs and 4 outputs.

Thanks!

The DIY instructions are pretty straight forward http://www.diyautotune.com/tech_articles/quadspark/using_the_quadspark.htm unless you're installing it on a V-8 then you need two Quad-Sparks. You got the MS3X expansion card right? If not you're stuck using a single coil. Are you using the stock Neon Coil or are you going Coil On Plug? Page 19 of the MS3X manual http://www.msextra.com/doc/pdf/MS3XV357_Hardware-1.3.pdf along with the DIY Quad-Spark instruction I posted explain it all. If that doesn't help you post your question with a little more detail because I'm confused about what you're confused about.

[contraption22]

Thanks! Yup I'm using the ms3x and the stock neon coil pack. I'm not sure how I missed that chart last night but I found it this morning. What did you do with the unused leads on the quadspark?

[A.J.]

I just capped them off incase I decided to go to C.O.P. later.

[contraption22]

Thanks, AJ.

Did you bundle all the grounds together to one heavy lead and ground it to the engine?

[A.J.]

Thanks, AJ.

Did you bundle all the grounds together to one heavy lead and ground it to the engine?

I made a metal plate that I bolted all my modules to and used that as a common ground to ground the modules to. Then ran a fat ground cable to the firewall and then to the head. The white cable on the metal plate in the picture is the ground I ran to the engine compartment.

http://i42.photobucket.com/albums/e301/thebest4/SRT-4/DSCF3801_zps2d695ed3.jpg (http://s42.photobucket.com/user/thebest4/media/SRT-4/DSCF3801_zps2d695ed3.jpg.html)

[contraption22]

Did you use the pre-made DIYautotune harnesses or start from scratch? If using theirs, what did you do with the unused wires?

I was thinking of removing them from the DB connector for the sake of keeping things clean, but I have kind of lost my patience with trying to use the pin tool.

[A.J.]

Did you use the pre-made DIYautotune harnesses or start from scratch? If using theirs, what did you do with the unused wires?

I was thinking of removing them from the DB connector for the sake of keeping things clean, but I have kind of lost my patience with trying to use the pin tool.

I bought both harnesses (MS3 and MS3X). The unused wires I just rolled up and stuck under the carpet. That way when I need to add something I just unroll it, it take out what I need, roll it back up, and put it back under the carpet.

[contraption22]

I bought both harnesses (MS3 and MS3X). The unused wires I just rolled up and stuck under the carpet. That way when I need to add something I just unroll it, it take out what I need, roll it back up, and put it back under the carpet.

Thank you. I'll try to find a neat place to do that.