bmx045

Last weekend I revisited the ignition timing idea. I noticed that my stock 05 LGT ROM had as much as 15 degrees less ignition advance than a stock 09 LGT ROM, and I started to wonder if maybe Subaru learned something in the 4 years after my car rolled off the assembly line...

 

For example, my ROM has 32 degrees at 2000 RPM and 0.5 g/rev, whereas the 09 ROM has 45 degrees.

 

At 1600 RPM and 0.5 g/rev, I have 24 degrees and the 09 ROM has 41.

 

At 2000 RPM and 0.25 g/rev, my stock ROM has 26 degrees, and the 09 ROM has 45 degrees.

 

So, I made a couple of new ROMs, with timing values from the 09 LGT in the 800-2800 RPM and 0.5-1.0 g/rev area. One ROM uses the values from the 09's Cruise timing table, the other uses the values from the 09's Non-Cruise table. The non-cruise table runs the most timing in this area (the comparisons in above this paragraph came from the non-cruise table) and it seems a little smoother. I need to do more A/B testing to be sure though.

 

The result has been significantly smoother driving in the sub-2500 RPM / sub-1.0 g/rev area.

 

I didn't make any AVCS changes because this problem is worst when the engine is cold and AVCS doesn't start operating until the engine warms up. I didn't make any AFR changes because this corner of the fuel table is all 14.7 anyway.

 

I've attached a screenshot of the timing table that I've been running since Saturday, using values from the 09 LGT's non-cruise timing tables. The highlighted cells are the only ones that I have tweaked for this experiment. The corresponding dynamic advance table has no advance in the 0.25 and 0.5 columsn, 1.05 degrees in the 0.75 g/rev column, and 1.4 degrees in the 1.0 g/rev column.

 

I still have more experimenting to do, but I was so impressed by the results of this change that I figure it's worth sharing right away.

The heads flow differently in 05 and 06 vs 07+.. perhaps they realized less timing (on a stock setup) could be achieved with the higher flow of the B25 heads...?

http://i1240.photobucket.com/albums/gg489/bmx045/bb6c39ed.jpg

http://i1240.photobucket.com/albums/gg489/bmx045/e04c1c42.jpg

Wheel brand/model: Privat Netz

Wheel height/width: 18x8

Wheel offset: +35mm

Tire size: 225/40 18

Camber F/R:

Lowered?: BC's

Modified Fenders?: Nope

Miscellaneous Suspension: Sways, endlinks

Do you have a dyno with the AVO 450? Is it laggy and spool really late on the 5EAT. I was thinking 380 because of the that.

https://www.facebook.com/photo.php?fbid=10150861861576386&set=a.399189951385.180335.303417876385&type=1&theater

pretty good spool, much like an 18g

my 08 seems to hit at 5k as well

http://i1240.photobucket.com/albums/gg489/bmx045/noTClockup-1.jpg

Yes, hopefully before summer 2012.

qft

this has been debated too many times.

some people have blown their tranny's with a 16g at just around 300hp, others have been fine running 320hp with a 20g.... though sprank is the only one i know of that blew a tranny with a 16g....