Timing vocab question
#1
Senior Member
Thread Starter
iTrader: (7)
Join Date: Aug 2007
Location: Southern Indiana
Posts: 1,369
Total Cats: -1
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
When someone says that they are running 6°btdc they mean thats what it is at idle....right? I mean, that will increase with RPM....right? I am wondering because i will be turboing my mspnp9495'ed miata and im going to need to get my timing right because the base map that comes with that starts at 18°btdc.
Thanks in advance
Thanks in advance
#3
Elite Member
iTrader: (5)
Join Date: Jul 2006
Location: Central California
Posts: 2,557
Total Cats: 5
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
the "base timing" idea does not apply when you are using megasquirt. It is only important that you synchronize the CAS and the Megasquirt before tuning. I did this by setting all the ignition tuning points near idle to 10* btdc and using a timing light, rotated the CAS until I saw 10* on the crank wheel.
#5
Boost Czar
![](/mt2011/images_td/ranks/supporter1.gif)
![](/mt2011/images_td/ranks/admin.png)
iTrader: (62)
Join Date: May 2005
Location: Chantilly, VA
Posts: 79,688
Total Cats: 4,113
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
megasquirt totally controls your ignition. there's no resetting timing. you have to input the entire timing map (load vs. rpm).
the only thing you have to do is make sure MS see the exact timing it thinks it sees. meaning, once installed, you can tell MS to keep a static 10° no-matter what the situation. this give you a chance to read the timing with a light. if it doesn't show up as 10° click a few mouse buttons can correct it (trigger angle).
Once MS "sees" the correct timing. a few more mous buttons can put you at 20° at idle or 1° at idle. you have complete control to do whatever.
the best way to explain it is, the stock ecu as it's own curve. the only thing you can do is either advance or retard that entire curve. with megasquirt you generate your own curve and you advanced and retard in only the areas you seem fit.
example:
here's my timing curve...i wanted to retard timing in boost (anything over 100kPa) and retard a few degrees at my peak torque 4200RPM.
the only thing you have to do is make sure MS see the exact timing it thinks it sees. meaning, once installed, you can tell MS to keep a static 10° no-matter what the situation. this give you a chance to read the timing with a light. if it doesn't show up as 10° click a few mouse buttons can correct it (trigger angle).
Once MS "sees" the correct timing. a few more mous buttons can put you at 20° at idle or 1° at idle. you have complete control to do whatever.
the best way to explain it is, the stock ecu as it's own curve. the only thing you can do is either advance or retard that entire curve. with megasquirt you generate your own curve and you advanced and retard in only the areas you seem fit.
example:
here's my timing curve...i wanted to retard timing in boost (anything over 100kPa) and retard a few degrees at my peak torque 4200RPM.
![](https://www.miataturbo.net/~web1_braineack/timing/newtiming1.jpg)
Thread
Thread Starter
Forum
Replies
Last Post
JesseTheNoob
DIY Turbo Discussion
15
09-30-2015 02:44 PM