Megasquirt Timing and Fuel Map Thread

[turbski]

m20b25 turbo

this was generated on a dyno last year. stock m20b25 franken holset wh1c/ hx35? around 8psi. made 320/320. right before the head gasket let go lol 42# injectors. wastegate only

[kyleconstantine]

awesome thanks... although thats a little scary ive got a ton more advance than that wot map. i imagine my timing mark or timing light inst accurate and my tooth angle is off.

[dvallis]

Oops. Didn't see this thread before I posted another one.

Here is a copy of the best (I thought) fuel and spark tables from e30tech.

[ForcedFirebird]

hey guys so the thread on e30tech is kinda back up and ive read through it again. I keep seeing people referencing the stock ignition map and saying it has the timing peak before peak hp and then timing pulls back to prevent knock at peak hp. However all the images of the stock map are dead. So does anyone have a copy of the stock motronic ignition map?

[kyleconstantine]

hey guys so the thread on e30tech is kinda back up and ive read through it again. i keep seeing people referencing the stock ignition map and saying it has the timing peak before peak hp and then timing pulls back to prevent knock at peak hp. however all the images of the stock map are dead. so does anyone have a copy of the stock motronic ignition map?

[Austrianvespaguy]

Hi all, figured I'd link this here for any other M10 interest. I did a very thoroug writeup including tuning tips and my maps when I Megasquirted my 2002 which can be found here and is great reference for anyone starting out:
https://www.bmw2002faq.com/articles....2-part-1-r287/

and for tuning:
https://www.bmw2002faq.com/articles....k-part-2-r292/

I just fired up my new E30 (stock M20B25) Megasquirt build yesterday; started on the first try! :D Will need to now do some tuning but will report back with my base maps once I get them dialed in a bit!

[87-325ic]

Here is my M20 E85 timing map.
Setup is 885 head with a 280/274 cam and a 2.7ETA bottom end. Car runs very good and is very fast.

Most importantly, my Tooth Angle #1 is set to 83 and falling edge. That is important to remember so don't just load these figures in unless you realize what that means!

This is a lot of timing in boost, but it is a 2.7 bottom so the quench is not as good as an 885 head that would require less timing. So this may be way too aggressive for a normal M20B25!

Would like some feedback on the map if anyone has any. I am still going to be making revisions to it once I hit the dyno.

Sent from my SAMSUNG-SM-G935A using Tapatalk

Tooth Angle #1 is set to 83 and falling edge.

best info here. its a wide world of internet confusion without a reference angle.

[Jaxx_]

Bumpski, let's get some more info on this thread. Anybody have m10 (turbo or NA) tables that I could use as a base?

probably too late for you, but...

http://www.jaxxd.com/e30/natune.msq

[cleanasse30]

Bump, interested in seeing more Turbo M20 timing tables!

[redsubdivisions]

To be honest I'm not sure what is too much and what isnt on this setup. I really won't know how it responds to changes in that area until I hit the dyno. Maybe 19* is too much, but why?

Sent from my SAMSUNG-SM-G935A using Tapatalk

Report back when you get it on the dyno. I'm curious.

[SLEEPYDUB]

I'm curious about your bottom RPM range. 19 degrees seems like a bit much? I had that on my 2.7 at one point but for whatever reason I felt like it was too much advance, so I redid my tables to nearly 16 degrees and adjusted the VE fuel tables as well.

To be honest I'm not sure what is too much and what isnt on this setup. I really won't know how it responds to changes in that area until I hit the dyno. Maybe 19* is too much, but why?

Sent from my SAMSUNG-SM-G935A using Tapatalk

[redsubdivisions]

Here is my M20 E85 timing map.
Setup is 885 head with a 280/274 cam and a 2.7ETA bottom end. Car runs very good and is very fast.

Most importantly, my Tooth Angle #1 is set to 83 and falling edge. That is important to remember so don't just load these figures in unless you realize what that means!

This is a lot of timing in boost, but it is a 2.7 bottom so the quench is not as good as an 885 head that would require less timing. So this may be way too aggressive for a normal M20B25!

Would like some feedback on the map if anyone has any. I am still going to be making revisions to it once I hit the dyno.

Sent from my SAMSUNG-SM-G935A using Tapatalk

I'm curious about your bottom RPM range. 19 degrees seems like a bit much? I had that on my 2.7 at one point but for whatever reason I felt like it was too much advance, so I redid my tables to nearly 16 degrees and adjusted the VE fuel tables as well.

[SLEEPYDUB]

Here is my M20 E85 timing map.
Setup is 885 head with a 280/274 cam and a 2.7ETA bottom end. Car runs very good and is very fast.

Most importantly, my Tooth Angle #1 is set to 83 and falling edge. That is important to remember so don't just load these figures in unless you realize what that means!

This is a lot of timing in boost, but it is a 2.7 bottom so the quench is not as good as an 885 head that would require less timing. So this may be way too aggressive for a normal M20B25!

Would like some feedback on the map if anyone has any. I am still going to be making revisions to it once I hit the dyno.

Sent from my SAMSUNG-SM-G935A using Tapatalk

[2002tiiguy]

bump to keep this up top

[SLEEPYDUB]

Anyone have an M20 E85 timing map they would like to share?