MegaSquirt PNP Parts List for M20

[Leebo]

Hi all – I’ve put together a MegaSquirt PNP parts list, with PNP being a major factor. I just wanted to make sure I’ve the most current (and correct) list of parts and thinking. It will be going in a dedicated track car (SETA with a cam) so I intend to get some dyno tuning to get the last bits out of it. Here’s what I’m looking at:

MSPNP2 (B8793) from Condor or directly at DIY Autotune

E36 TPS (13631721456) from FCPEuro

TPS Adapter Harness Huggins Racing

TPS Adapter Bracket Huggins Racing

GM IAT Sensor DIY Autotune

IAT Adapter Harness Huggins Racing

O2 Wideband Sensor - not needed to run but helpful for tuning – would appreciate suggestions here…

Pipe from Throttle Body to stock air box (eliminate AFM) –suggestions here also…

10k resistor for high RPMs - no longer needed (already in the MSPNP2)


THANKS!

[AWDBOB]

Buy this instead https://www.classicdaily.net/collect...g-and-play-ecu

[Digitalwave]

Buy this instead https://www.classicdaily.net/collect...g-and-play-ecu

Besides the cheesy looking case (pun intended), what is better about that than a Megasquirt?

[e30davie]

Your list looks good, but I would definitely get a wideband 02 from the beginning. yes its a track car and will be dyno tuned but its so good to have instant feed back for diagnostic purposes as well as closed loop AFR control at idle and light loads. With the paid version of tuner studio and a wideband you can tune the car yourself to like 95% before you get to the dyno.

Buy a good one though, the Ballenger v500 has been working for me for many years. you get what you pay for with wide band controllers. cheap ones don't last long.

I personally am a big advocate for swapping to distributor less ignition. which is quite easy to do on the mega in wasted spark (3groups of 2 coils, or 3qty dual post coils). but that does require a bit of wiring. but it does simplify things a bit from a mechanical perspective.

[AWDBOB]

Besides the cheesy looking case (pun intended), what is better about that than a Megasquirt?

I'll tell jake to respond, but in general it uses RusEFI firmware which is far superior to MS firmware, it converts crank signal to hall effect so you don't have the constant crank signal issues so many have with MS, he includes a new injector harness that has incorporated IAT plug, so no need to adapt AFM harness, his standalone can run wasted spark without the annoying extra module required when you do wasted spark with Megasquirt, and a bunch of other stuff. Oh, and it's cheaper and comes with way more stuff, like an AFM delete pipe, that is annoying to have made if you're not a fabricator, and i bet he'd send you a pack of oreos if you ask nicely

[varg]

A wideband setup isn't just helpful for tuning, it's mandatory. Don't listen to anyone who tells you that you can tune well without it, we aren't slapping 4 barrels on smallblocks here. I like my AEM 30-0300s that I have in both of my cars, and they've had decent customer service. The connectors are delicate though so I'd be very careful feeding them through firewall grommets. If you feel like it, with TPS adapter harness being awfully expensive, you can find those connectors online and build one yourself for cheaper.

https://www.te.com/usa-en/product-CAT-T4827-CH8172.html

https://www.te.com/usa-en/product-444343-1.html

https://www.te.com/usa-en/product-1-962581-2.html

https://www.te.com/usa-en/product-282191-2.html

https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/1-827578-1/2054419

https://www.digikey.com/en/products/detail/te-connectivity-amp-connectors/1-962581-2/10468547

These and their associated contacts and wire seals, they are kind of tricky to crimp well without a good crimper, make sure you crimp the insulation grip part well.

Buy this instead https://www.classicdaily.net/collect...g-and-play-ecu

That's interesting looking. Nice that it undercuts megasquirt price, requires no mods to the stock harness even for TPS and fits in the stock spot. I have only touched a rusefi ECU twice and I didn't see any drawbacks with it other than possible lack of info base but my long term experience is with megasquirt and they seem to last.

[jakeb]

I am Classic Daily and the Turkey and cheese PNP is my product. There are many reasons its better than megasquirt. The hardware is MUCH more modern with a processor that is twice as fast with much more memory.
The firmware is still being updated with new features all the time. (It runs rusefi and now a fork of rusefi called FOME).
Blend tables
Different modes, idle, coasting, main, power, overrun and you can control each in a different way.
closed loop fuel control works AMAZING...zero tweaking of any PID...just works.
Idle control has much more adjustability than Mega...coating IAT tables to help catch when RPMS are falling fast.
LUA scripting for custom strategy.
etc etc
Currently they are adding AFR protection in the most recent build.


My kit above also comes with everything needed. TPS, TPS adapter, TPS harness, Air Temp Sensor, AFM delete tube, and also a better fuel injector harness...it requires to use 3 banks of 2 rather than 2 banks of 3. This helps for smoother idle, wasting less fuel, lower injector duty cycle lower, and better fuel timing.

I also offer plug and plug ignition upgrades. Here is a link to the LS coil setup. https://www.classicdaily.net/collect...20-ls-coil-kit
I also can supply a plug and play wideband sensor that would require zero wiring. Just plug it into the aux port.

The crank signal circuit uses a MAX9926 chip rather than resistors that can require being changed. Just a nice clean square wave back to the ecu.

Oh....it's also currently cheaper than MSPNP

ALSO I personally can support them and can remote tune them. (all come with base tunes matched to your setup)

I have one on my personal turbo M20 E30 that I daily drive at 15psi. Have over 5k miles on it this summer...long trips, track days, LOTS of daily driving.
I posted a bunch of youtube videos on that car including an Install videos of this ECU. Here is a link to that video, https://www.youtube.com/watch?v=d-vjNU1tlIQ&t=1455s
Check the rest of the channel for others including lots of dyno action!

Feel free to ask questions here or shoot me an email, jake@classicdaily.net

[Digitalwave]

It seems like a good alternative, especially since nobody is really making PNP kits like DedericMS and that other guy used to do.

I'm curious, though, why make it look and sound so... silly?

[jakeb]

It seems like a good alternative, especially since nobody is really making PNP kits like DedericMS and that other guy used to do.

I'm curious, though, why make it look and sound so... silly?

Because life is silly...all these cars are silly...but we do it all because it's fun. And as Warren Zevon said when he knew he was going to die.... You have to enjoy every sandwich. If you want to dig in here is a direct link to that interview. https://youtu.be/giTi8KWSZl4?t=398

Also it makes people remember it. MSPNP is just boring......

[varg]

Interesting info. While everyone here who knows me knows that I am a big megasquirt fan because I've used them in my DDs for many years and have built and tuned a lot of them, MS2 is indeed primitive for the price and there is a good market for more capable ECUs at the price point. I just hope those rusefi based boxes are as hardy. Knock on wood, I have never had a MS fail on me and a vast majority of the ones I've fixed were damaged by wiring blunders or shoddy DIY soldering. A true PNP setup with no wiring mods like what OP seems to be trying to set up is valuable. These harnesses are hard to come by so avoiding modding them if possible is a good thing.

[McGyver]

I'm not advocating one way or the other, but here is my build thread from making my MS2. It also has lots of info about how I plan to wire it and use adaptors to avoid cutting into my wiring harness. I'm hoping to actually get this on my car some time next year.

https://www.r3vlimited.com/board/forum/e30-technical-forums/engine-drivetrain/alternative-tuning-w-a-r-megasquirt-etc/9917593-megasquirt2-v3-0-w-ms2-extra-3-4-2-build-and-wiring

[Ritzace]

Angry ass makes a good m50 tps adapter plate here

[Digitalwave]

Angry ass makes a good m50 tps adapter plate here

That's a nice piece. Mine is way more primitive.

[WAKman]

I'll tell jake to respond, but in general it uses RusEFI firmware which is far superior to MS firmware, it converts crank signal to hall effect so you don't have the constant crank signal issues so many have with MS, he includes a new injector harness that has incorporated IAT plug, so no need to adapt AFM harness, his standalone can run wasted spark without the annoying extra module required when you do wasted spark with Megasquirt, and a bunch of other stuff. Oh, and it's cheaper and comes with way more stuff, like an AFM delete pipe, that is annoying to have made if you're not a fabricator, and i bet he'd send you a pack of oreos if you ask nicely

Sounds like a good setup I wish I knew about before going with the Megasquirt pnp for my M20 stroker. I’ve had quite a bit of trouble with the aforesaid crank signal issues, with the car MS “losing synchronization” on a hot engine in hot ambient conditions. I’ve moved the sensor in to .3mm from the crank wheel, and it still happens. Next I’ll try adjusting the variable resistor inside the MS to change its sensitivity.

A solution that converted to a Hall Effect would be a nice improvement. A d now here’s my car:

[Digitalwave]

0.3mm is too close. If using an aftermarket CPS, buy a metal OEM one. Then try messing with resistors, but that shouldn't really be necessary.