do I understand, 14 degrees through the boost range from 5500rpm up?

 

Are you sure these cars are "locking" their timing? Or are they just running a lot less timing than what we would think is normal but they are still maintaining a progression as the RPM builds?

I have seen posts by AMS for example where they said their big car made 775whp and tha tthe timing was "in the 8-12* range" This sdoesn't really say anything about how the curve progresses though.

 

Yes it is a locked timing from usually around 45-5 to redline. Just like he said.. I still dont udnerstand the point and for some reason no 'tuners' want to chime in I guess

 

I just went back to read the AMS post on the EMS site and he said " A/F's where high 11's and timing was 11-12 degrees UP TOP."

To me this would indicate that the timing on this particular car was still progressing. Your question is a good one though and I have been wondering similar things lately on my setup.

 

where did you get your maps or info from? what gave you the idea that people set their timing to advance 10 degrees(or whatever) across the RPM band from 4500 on??? You weren't looking at some piggyback maps or anything were you? Some of those are in offsets of the stock ECU.....so the car isn't doing what the map says per se.

just wanted to throw that out there because i don't know if you mentioned what you were looking at or where you got the info.

 

OK, read the whole thread to see if anyone else answered before I chimed in with my idea.

I think that with a turbo that is having a hard time maintaining high boost levels (stock, or a smaller upgrade turbo) you can make the turbo produce more boost at high RPM by running lower timing. When you retard the timing like that, when the exhaust valves open the air fuel mixture is still burning, and that extra exhaust energy can give the turbo that extra little push to produce the high boost levels on a small turbo.

This is just a speculation on my part. On the cars you saw this method used on, was the turbo in question a small upgrade or the stock unit?

Later,

Keith

 

Most of them are pretty big The timing maps that i have seen are from mainly DSMs using the DSMLink. It is a piggy back but I am not looking at thier adjustments to the timing. I am looking at thier end results which they are obviously attempting to keep at a locked timing.

The theory of keeping the turbo spooled high is neat though. I was always considering killing my low end and retarding the timing a bunch to see if I could make mine spool quicker on the street. Just too lazy to try it out.