Curious Timing Issues - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to   Members

MEGAsquirt A place to collectively sort out this megasquirt gizmo

LinkBack Thread Tools
Old 04-29-2009, 12:07 AM   #1
Junior Member
Thread Starter
iTrader: (4)
Join Date: Sep 2007
Location: Detroit, MI
Posts: 124
Total Cats: 0
Default Curious Timing Issues

I was running on the highway today tuning spark. The timing map i started with looked like this:

With ~13 deg timing @12psi in the 3k-4.5k RPM range, I would get unstable MAP readings, a little hesitation, and my knock sensor would go off if I stayed in the gas. I back timing off 3 deg in boost across that RPM range, and no improvement with anything.

Then I go the other way, and advance 2 deg from base to ~15deg @ 12psi. Now, MAP signal is much cleaner, knock sensor is quite, and the car pulls silky smooth and eagerly. WTF... I thought reducing timing would remedy knock, but this is just confusing to me. I'm not complaining... it's seems like the best of both worlds , but am I missing something?

I ended up with this timing map:

Here are two pulls:
Base timing:

Adv timing:

FYI, I'm running 94 octane Sunoco.
zzyx7 is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
Someone help me with AE ihiryu MEGAsquirt 33 10-08-2015 05:56 PM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM
Odd Steering issue interestedofold Suspension, Brakes, Drivetrain 5 09-29-2015 02:42 PM

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 01:47 AM.