Megasquirt Timing and Fuel Map Thread

[Quatrelle]

2.9 stroker NA maps

Thank you for this thread ! I'm finishing a m20 stroker and I'm looking for a fuel and ignition map. Not easy since e30tech is down.

NA m20 here, so my setup is:

M52 crank + 1 mm overbore pistons (Mahle Motorsport) = 2860 cc with 10:1 CR
KS Kolbenschmidt cylinder head (looks like a AMC :( ) with stock valves
A 285° Cat Cams cam
Stock inlet manifold with port matched
Exhaust manifold is a cheap one purchased on Ebay (Hottuning like, quality is not great)
Throttle body is a kind of bigbored with a m30 throttle plate to replace the stock m20b25 one
Megasquirt on a speed density base.

I would be very happy is someone has a base fuel and ignition map to start with. Thank you !

[driftxsequence]

Woops!

[downforce22]

Here is an example that I found to start us out, this is not my map but comes from a base m20b25 found at megasquirtpnp (http://www.megasquirtpnp.com/mspnp2_maps.php) for a non turbo base m20b25 running megasquirt.

downforce, you may need to adjust your tables. youre fuel and ignition maps are currently set to "100%" and as far as I understand 100% is atmospheric pressure, so anything in boost is not being registered properly. 200% would be 14.7 PSI of boost.

You are correct, next time please read.

[driftxsequence]

downforce, you may need to adjust your tables. youre fuel and ignition maps are currently set to "100%" and as far as I understand 100% is atmospheric pressure, so anything in boost is not being registered properly. 200% would be 14.7 PSI of boost.

Here is a link and image from Aaron cake's (How to Megasquirt your FC RX7) with lots of great info on megasquirt, and tuning.

[CorvallisBMW]

I'll try and get my m30 turbo stuff posted in here.

[murdough]

I'm all for this, e30tech being down has been a huge roadblock for me this past month. I'll post what I have once it gets sorted a little better

[nomansland92]

Engine Specs: m20 2.8L, 8.5:1 compression forged bottom end, dual pattern cam
Turbo Manifold: Custom twin scroll
Turbo: borg warner s256
Compressor Wheel: FMW 56mm
Turbine Wheel: 2.54/2.92 turbine wheel
Boost Level: 25psi
Injectors: Injector dynamics 1000cc
Ignition Map:
Fuel Map:
Comments: Car runs smooth and pulls great through mid range

the car is on Haltech engine management but that makes no real difference.

[downforce22]

So with e30tech being down for the foreseeable future, we ended up losing a great resource in the 'Participate or Die' Megasquirt thread that was over there with a wealth of information on m20 turbo maps. As I try to tune my m20 turbo, it would be helpful to see what others have done with their m20 turbo tune and information on the map/ engine build.

So lets try to rebuild a reference again and please post the following:

Engine Specs:
Turbo Manifold:
Turbo:
Compressor Wheel:
Turbine Wheel:
Boost Level:
Injectors:
Ignition Map:
Fuel Map:
Comments:


Here is an example that I found to start us out, this is not my map but comes from a base m20b25 found at megasquirtpnp (http://www.megasquirtpnp.com/mspnp2_maps.php) for a non turbo base m20b25 running megasquirt. I'm making up the other info as an example.


EXAMPLE:

Engine Specs: M20B25 2.7i stroker
885 head on eta bottom end, all stock
Turbo Manifold: CXracing later 3-2-1 style
Turbo: Holset HX35
Compressor Wheel: 57/78mm compressor
Turbine Wheel: 60mm turbine exducer
Boost Level: 10 psi for now
Injectors: 30 lb
Ignition Map:

Fuel Map:

Comments: Boost hits hard at 3700 RPM and and pulls like a freight train til redline. OMG SO FAST!1!!
:up: