08 STi timing not adding up

merchgod · **Joined:** Thu Mar 30, 2006 2:38 am **Posts:** 5336

Airboy wrote:

Maybe contact Bullwinkle since it sounds like he'll be logging an 08STi this weekend.

Sure, just PM me Bullwinkle, but give me a heads up before you go so I have time to create them.

Bullwinkle1983 · **Joined:** Sat Dec 16, 2006 5:59 pm **Posts:** 197

Oops, I forgot to look at this thread until today. I've still got the car, but will be returning it to the owner later today. Merch, I'll send you a PM for def's, but cant promise I'll have a chance to run them.

I'll post up some logs of what Airboy requested when I get a chance (already have those).

Bullwinkle1983 · **Joined:** Sat Dec 16, 2006 5:59 pm **Posts:** 197

Ok, I've got some logs with test defs I sent to Merch to look at. Otherwise, you can see the logs I took for stock and stage 1.

For stage 1, the timing maps are:

Sorry Airboy, I wasn't able to get a log with just the IAT comp B zeroed.

merchgod · **Joined:** Thu Mar 30, 2006 2:38 am **Posts:** 5336

Thanks Bullwinkle - those logs were very useful. The timing discrepancy that Airboy found appears to be due to a per gear timing compensation. Generally, the higher the RPM and load, the greater the negative compensation, while the higher the gear, the less the negative comp. It is not always active and I have to work on it some more to determine when it active, but it is certainly something I can add to the upcoming defs. During the WOT run in the log, it was active the entire time, while at lower loads, it was more sporadic when it was active.

Bullwinkle1983 · **Joined:** Sat Dec 16, 2006 5:59 pm **Posts:** 197

merchgod wrote:

Thanks Bullwinkle - those logs were very useful. The timing discrepancy that Airboy found appears to be due to a per gear timing compensation. Generally, the higher the RPM and load, the greater the negative compensation, while the higher the gear, the less the negative comp. It is not always active and I have to work on it some more to determine when it active, but it is certainly something I can add to the upcoming defs. During the WOT run in the log, it was active the entire time, while at lower loads, it was more sporadic when it was active.

Great, glad you figured it out. Those tables sound like they would be quite useful, and it would be great if you could include them in the next def update.

Thanks for all your work, Merch!

Airboy · **Posted:** Mon Mar 02, 2009 7:15 am

merchgod wrote:

Thanks Bullwinkle - those logs were very useful. The timing discrepancy that Airboy found appears to be due to a per gear timing compensation. Generally, the higher the RPM and load, the greater the negative compensation, while the higher the gear, the less the negative comp. It is not always active and I have to work on it some more to determine when it active, but it is certainly something I can add to the upcoming defs. During the WOT run in the log, it was active the entire time, while at lower loads, it was more sporadic when it was active.

So I am not crazy

I was doing some remote tuning on an 08 STi this weekend using Access Tuner Race and I saw the same sort of timing offset; varying through the 3rd gear pull from 0.7* up to 1.8* between 2500 to 6300rpm.

merchgod · **Joined:** Thu Mar 30, 2006 2:38 am **Posts:** 5336

Looked at it again, and the per gear comp has minimum thresholds for load and RPM which determines when it is active.

ev8siv3 · **Joined:** Fri Mar 24, 2006 7:14 pm **Posts:** 768

merchgod wrote:

Looked at it again, and the per gear comp has minimum thresholds for load and RPM which determines when it is active.

I would like to test disabling these if possible. I have noticed that I get feedback only when in certain RPM's and Loads in 3rd gear and higher. All other gears have not exhibited this behavior, and it appears random enough to be a compensation table like this.

merchgod · **Joined:** Thu Mar 30, 2006 2:38 am **Posts:** 5336

ev8siv3 wrote:

I would like to test disabling these if possible. I have noticed that I get feedback only when in certain RPM's and Loads in 3rd gear and higher. All other gears have not exhibited this behavior, and it appears random enough to be a compensation table like this.

Sure, just shoot me a PM.

Another thing I noticed as it related to IAT B, is that there's the potential for more timing on top of IAT B comp when the IAM < 1. So, even if IAT B is zero'd out, you can still have additional timing at the same point IAT B would normally be active. I'll address this in the next ECU def update.

Fiend · **Joined:** Tue Apr 24, 2007 10:49 pm **Posts:** 243

merchgod wrote:

Thanks Bullwinkle - those logs were very useful. The timing discrepancy that Airboy found appears to be due to a per gear timing compensation. Generally, the higher the RPM and load, the greater the negative compensation, while the higher the gear, the less the negative comp. It is not always active and I have to work on it some more to determine when it active, but it is certainly something I can add to the upcoming defs. During the WOT run in the log, it was active the entire time, while at lower loads, it was more sporadic when it was active.

Did the per-gear timing compensation table(s) make it into the new definitions? I'm curious whether these tables are the same ones Cobb exposes as ignition acceleration compensation.

Thanks.

merchgod · **Joined:** Thu Mar 30, 2006 2:38 am **Posts:** 5336

no, they did not make it into the definitions.

MFB · **Posted:** Tue Jun 29, 2010 2:41 am

merchgod wrote:

no, they did not make it into the definitions.

Will this ever be out? Also have same issue now with the fxt 09 edm.

RomRaider

08 STi timing not adding up

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