check out the difference between the open loop load map #1/#2 on the 2003/2004 ecu's and the 2005 ecu's. left is 2003 right is 2005.

 

The IX looks very close to the 2005 as well.

 

Pardon my ignorance, but what does this map do?

 

I think there is an issue with the RPM scaling on the 05 (right side), it only goes to 6k RPM and the increments are 250 instead of 500 like on the 04...

I don't know squat about com programing but I've seen that problem before when ECUFlash didn't have all the definations for a specific ROM.

 

we dont know yet

 

Posted this in another forum here but thought it belongs in this thread as well:

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Ok, here is a 3rd and 4th gear log from my car from awhile back. It's a long screenshot but there is alot of data. Keep in mind this is from a log that was WOT in 1st,2nd,3rd and 4th, just like you would normally do for full acceleration or 1/4 mile or ripping off one from a stoplight.

3rd gear - 6086rpm = 11.1 afr - timing = 11*
4th gear - 6018rpm = 11.0 afr - timing = 11*

3rd gear - 6520rpm = 11.1 afr - timing = 16*
4th gear - 6509rpm = 11.1 afr - timing = 15*

3rd gear - 7081rpm = 11.1 afr - timing = 20*
4th gear - 7002rpm = 11.2 afr - timing = 17*

 

why is your temp jumping between 176 and 194. also, how where you able to read the Hz about 1603.95?

 

Not sure. It only happens in 4th. I did have stretched headstuds at the time so maybe I was pressurizing the coolant at that point.

This is a ECU+ log, it doesn't have the 1603hz limitation of Evoscan.

 

Thanks, Bryan. After heading back to the drag strip this past Friday, I think what I was experiencing was a side-effect of knock protection. I still need to collect some more quality data, but it appears that the car was picking up knock in the higher gear on a drag pass, pulling a bunch of timing, and the AFR is showing richer.

 

bumping this back up...

I've been able to tune to a consistant AFR in 2nd - 4th gears at the track and on the street. I believe the reason for the difference is due to how the car 'loads' (or how boost builds) during a drag pass vs. during a 3rd gear pull on the street.

You are in different load cells which is why the A/F ratio is different.

 

So is the concensus that the AFR should be the same in all gears Ideally? Or is a tune for 3rd ok?

 

I don't know for sure which method is correct but I would 'assume' that for max performace you would want a different A/F in every gear since the load on the engine is different for every gear a universal A/F wouldn't yeild max power.

 

Yup, this is exactly why I said a log banging through the gears will be different then just logging single gear pulls.

 

Here are my test results. I have done about 5 full 3rd gear wot pulls and shifting to 4th gear and going WOT until approx 6300 rpm. In each and every one of them the AFR in the 4th gear was richer than the AFR in the 3rd gear. The 5500 rpm point in 4th gear is the spool up point after the shift. That is why it dips well below 11:1. Here are the relevant rpm sections:

3rd gear



4th gear

 

I am going back to accelleration enrichment tables based on TPS input. I believe TPS input enrichening to be the culprit.