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Megasquirt ECU ,anyone?

DavidU

By DavidU,
in Engines & Forced Induction

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DavidU Enthusiast

DavidU

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A few of the Z guy's are building the Megasquirt programable ECU.The kit cost's about $250 and uses a manifold vac transducer and O2 . Suitable for turbo,and N/A. Used with an aussie O2 wide band kit will give you a variable AF ratio of between 14.7 and 12.5 (power) and is VERY accurate and fast V sig out to the ECU. Any one game?

I work in electronics and I want to give it a go soon.

http://www.bgsoflex.com/megasquirt.html

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DavidU Enthusiast

DavidU

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This thing will give you almost total control of your A/F R. Click the link below to see the variable prossessor functions.It will give real time screen shot out's and VERY accurate O2 reading's fast. No obstructional AFM's of MAF sensors. Have a lap top next to you and adjust it all on the fly in incements of 100,(very easy to read.) They will have an exhaust Ironisation feed back loop that will feed an ignition ECU as well.Perfect ignition timing alway's.

http://www.bgsoflex.com/megasquirtpc.html

DavidU Enthusiast

DavidU

Posted
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Not a piggy back unit.It's stand alone. The Motoola prosessor has a bus speed of 8 meg,not like most that quote the xtal frequency witch is devided by 4 to get the real bus freq. It has 64 point VE table ( not 8),and is writen in Direct assenbly code which will be good to 16,000 rpm. It will drive suplimentary relay control to 500ma.

  • 5 years later...
fr0st Experienced

fr0st

Posted
Posted (edited)

I'm using a megasquirt 2 with the MS Extra code. I had it hooked up for fuel delivery, ignition was next on the list but I went and crashed the R32 into a pole (hopefully back soon).

Getting it to do coil on plug ignition is a bit of a mission, I was planning on making microcontroller circuit to handle it. Wasted spark would be easy however, and we already have an ignitor that's compatible with the megasquirts outputs. You do have to modify the CAS for ignition, its very similar to the Autronic wheel.

I think I paid $600 for the MS2 kit and a Wideband controller and sensor from DIYautotune.com. It would be a lot less now with our dollar up. It's not a bad deal if your willing to learn about tuning and a bit of electronics.

Keep in mind it can handle the AAC valve, boost control, spark and fuel cut rev limiters, launch control, water injection control,NOS control, wideband O2 sensor support and knock control. It's MAP sensor'd as well so you can ditch the AFM, or keep it cause it supports that too.

EDIT: If anyone wants more info just ask in here, I'll try and answer best I can

Edited by fr0st
darksyde Rookie

darksyde

Posted
Posted
I'm using a megasquirt 2 with the MS Extra code. I had it hooked up for fuel delivery, ignition was next on the list but I went and crashed the R32 into a pole (hopefully back soon).

Getting it to do coil on plug ignition is a bit of a mission, I was planning on making microcontroller circuit to handle it. Wasted spark would be easy however, and we already have an ignitor that's compatible with the megasquirts outputs. You do have to modify the CAS for ignition, its very similar to the Autronic wheel.

I think I paid $600 for the MS2 kit and a Wideband controller and sensor from DIYautotune.com. It would be a lot less now with our dollar up. It's not a bad deal if your willing to learn about tuning and a bit of electronics.

Keep in mind it can handle the AAC valve, boost control, spark and fuel cut rev limiters, launch control, water injection control,NOS control, wideband O2 sensor support and knock control. It's MAP sensor'd as well so you can ditch the AFM, or keep it cause it supports that too.

EDIT: If anyone wants more info just ask in here, I'll try and answer best I can

awesome mate was gonna use ms on my 32 as well, only problem being how to modify the cas???? been looking for info for ages but no luck. not sure what trigger wheel to use at all??

fr0st Experienced

fr0st

Posted
Posted

heh didn't even notice. I just saw on the main FI page.

You don't need to modify your Cas just to do fuel. You need to tap and buffer one of the signals from the cas and the megasquirt can read the RPM off this. The idea of the micro controller circuit was to keep the original CAS and just bend the signals to suit the MS.

Modding the cas would be fairly simple. The MS triggers off the inside (IIRC) signal which give one pulse per cylinder. The outside signal on the wheel has one pulse per degree, which is useless for the MS. What it needs is a reset pulse, once per revolution of the CAS. This pulse tells it that its back at the first cylinder. So in short, you cover the entire outside track on the CAS wheel and make a hole in between the 6th and 1st cylinder. The slots in the inside track get shorter as they go from 1 -> 6, so 1st is the largest and 6th is the shortest. The trailing edges of the inner pulses are all 60 degrees apart on the wheel so its perfectly acceptable to trigger of that.

darksyde Rookie

darksyde

Posted
Posted
heh didn't even notice. I just saw on the main FI page.

You don't need to modify your Cas just to do fuel. You need to tap and buffer one of the signals from the cas and the megasquirt can read the RPM off this. The idea of the micro controller circuit was to keep the original CAS and just bend the signals to suit the MS.

Modding the cas would be fairly simple. The MS triggers off the inside (IIRC) signal which give one pulse per cylinder. The outside signal on the wheel has one pulse per degree, which is useless for the MS. What it needs is a reset pulse, once per revolution of the CAS. This pulse tells it that its back at the first cylinder. So in short, you cover the entire outside track on the CAS wheel and make a hole in between the 6th and 1st cylinder. The slots in the inside track get shorter as they go from 1 -> 6, so 1st is the largest and 6th is the shortest. The trailing edges of the inner pulses are all 60 degrees apart on the wheel so its perfectly acceptable to trigger of that.

awesome thanks mate. this whole thing is going to be a big learning curve for me but im looking forward to it. is there anything else ill need to look at doing to run it for both ign and fuel?

fr0st Experienced

fr0st

Posted
Posted

Definitely get a wideband sensor, you can't do without it.

To make the initial maps, measure the AFR's around the rev range with the stock ECU controlling things. Once you've gotten a good idea of what the ratio's should be connect 2 or 3 of the injectors to the MS. Tune the fuel delivery till the AFR's are back to normal then connect the other 3 injectors. Tuning it from absolute scratch is a pain in the ass, this will speed up the process considerably. Just remember if you have way too much fuel your wideband can read lean, tune in small amounts and make sure your moving the right direction.

If your dead set on tuning the ignition table yourself get a knock meter. There are circuits out there that can interface the MS with factory knock sensors but there not perfect. Get something reliable so you don't go throwing rods around the engine bay.

Read up at www.msextra.com

It's an awesome feeling cruising around on an ECU you built and tuned yourself, you'll learn a metric shitload as well :blink:

  • 2 months later...
foodie Newbie

foodie

Posted
Posted

Sorry to bring up an old post but I found it with google. Check out this guys youtube clips on megasquirt. Also has some other kick vids http://www.youtube.com/profile_videos?user=turbo280z

My friend has MS'd his porsche 924 and I am about todo my rb20det powered 260z. Nothing like learning!!!

Definitely get a wideband sensor, you can't do without it.

To make the initial maps, measure the AFR's around the rev range with the stock ECU controlling things. Once you've gotten a good idea of what the ratio's should be connect 2 or 3 of the injectors to the MS. Tune the fuel delivery till the AFR's are back to normal then connect the other 3 injectors. Tuning it from absolute scratch is a pain in the ass, this will speed up the process considerably. Just remember if you have way too much fuel your wideband can read lean, tune in small amounts and make sure your moving the right direction.

If your dead set on tuning the ignition table yourself get a knock meter. There are circuits out there that can interface the MS with factory knock sensors but there not perfect. Get something reliable so you don't go throwing rods around the engine bay.

Read up at www.msextra.com

It's an awesome feeling cruising around on an ECU you built and tuned yourself, you'll learn a metric shitload as well :miner:

  • 1 year later...
omygod Apprentice

omygod

Posted
Posted
Sorry to bring up an old post but I found it with google. Check out this guys youtube clips on megasquirt. Also has some other kick vids http://www.youtube.com/profile_videos?user=turbo280z

My friend has MS'd his porsche 924 and I am about todo my rb20det powered 260z. Nothing like learning!!!

I've managed to get MSII working with EDIS 6 on R33 GTR...I bought the board from the US...sourced the parts

here here through Jaycar etc...and the hard to find ones here: http://pjoz.com/electronics.htm#msquirt

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