AVCS - Intake and Exhaust Timing

[Wayno]

Why so many changes? How do you test it all so thoroughly that you don't lose power?

If I cared about Stg1, which trust me I don't, I wouldn't make so many changes, besides restore the AVCS under 3000 where the OEMs new what they were doing.

Originally Posted by shr133

Here are my current tables for an auto.........





Have you guys done any tuning on the DI angle?????
Had to fix this map seams to run much better.....

[KoolBRZ]

Originally Posted by shr133

Here are my current tables for an auto.........





Have you guys done any tuning on the DI angle?????
Had to fix this map seams to run much better.....

Can you upload these from a PC instead? They aren't coming up at all and I'm interested to see them.

[Nah]

^^^^ I just used that table above for my 86 and WOW what a difference. Mods are JDL UEL header and cbe. So much smoother throughout the rev range very aggressive sounding but most importantly no knocking A/F is good and at WOT my fuel trims are dead at 0. For cruise and idle it can be smoothed out a little more which I plan to do and get back to here but I highly recommend using that table as a "template" because man it truly was night and day. Thanks for posting that.

[KoolBRZ]

Originally Posted by Nah

^^^^ I just used that table above for my 86 and WOW what a difference. Mods are JDL UEL header and cbe. So much smoother throughout the rev range very aggressive sounding but most importantly no knocking A/F is good and at WOT my fuel trims are dead at 0. For cruise and idle it can be smoothed out a little more which I plan to do and get back to here but I highly recommend using that table as a "template" because man it truly was night and day. Thanks for posting that.

I also averaged about 26 MPG on them. I went back to the drawing board using Shiv's stage 2 AVCS tables as a template. Since then my best MPG average has gone up to 37.5. I also wanted smooth acceleration, no hesitation after shifts, quicker throttle response, and better torque between .5 and 1.0 Engine Load. 25 versions later I have these tables. Try these out, give it a few days to settle in, and tell me how they stack up to the previous tables.

[Wayno]

These do fix for the most part the bogging/shifting to around 2200 in auto mode.

I wouldn't change the timing so much from shiv's dyno tuned timing at WOT for NA though.

Would be interesting to see if these would benefit uel and short el.

MT UEL Intake


MT UEL Exhaust


AT UEL Intake


AT UEL Exhaust


MT EL Intake


MT EL E0 Exhaust


MT EL E85 Exhaust


AT EL Intake


AT EL E0 Exhaust


AT EL E85 Exhaust

[KoolBRZ]

Originally Posted by Wayno

These do fix for the most part the bogging/shifting to around 2200 in auto mode.

I wouldn't change the timing so much from shiv's dyno tuned timing at WOT for NA though.

Would be interesting to see if these would benefit uel and short el.

What exactly changes as a tune acclimates? This tune started out great, then started lagging after shifts on the third day after loading it. Quick response is still good. Mild acceleration/cruise MPG is still good. Lagging after shifting has gotten just a bit worse. Is it timing advance? Does it get more advanced over time, or does it get less advanced?

[Wayno]

Are you asking or telling?

Originally Posted by KoolBRZ

What exactly changes as a tune acclimates? This tune started out great, then started lagging after shifts on the third day after loading it. Quick response is still good. Mild acceleration/cruise MPG is still good. Lagging after shifting has gotten just a bit worse. Is it timing advance? Does it get more advanced over time, or does it get less advanced?

[steve99]

Originally Posted by KoolBRZ

What exactly changes as a tune acclimates? This tune started out great, then started lagging after shifts on the third day after loading it. Quick response is still good. Mild acceleration/cruise MPG is still good. Lagging after shifting has gotten just a bit worse. Is it timing advance? Does it get more advanced over time, or does it get less advanced?

AFAIK the ECU only "learns" knock correction info like FLKC table and IAM and LTFT info. And some sensor calibration info like Knock sensor background noise and throttle position, and possibly some initial calibration of cam sensors in first minute or so after reflash/reset.


Their appears to be no learning of cam data, or cam timing optimisation my ECU.

[Wayno]

Originally Posted by steve99

AFAIK the ECU only "learns" knock correction info like FLKC table and IAM and LTFT info. And some sensor calibration info like Knock sensor background noise and throttle position, and possibly some initial calibration of cam sensors in first minute or so after reflash/reset.


Their appears to be no learning of cam data, or cam timing optimisation my ECU.

It does learn fuel, which means load changes, which means looking up different AVCS values.

The other possibility is his imagination.

[steve99]

Originally Posted by Wayno

It does learn fuel, which means load changes, which means looking up different AVCS values.

The other possibility is his imagination.

Depends, I suspect it learns ltft which is used as an offset to the fueling, but would not actually offset the load calculation.


Load is simply equal to MAF g/s * 60 / RPM

[KoolBRZ]

Originally Posted by steve99

Depends, I suspect it learns ltft which is used as an offset to the fueling, but would not actually offset the load calculation.


Load is simply equal to MAF g/s * 60 / RPM

So, basically timing advance and LTFT. I'm going to try a different Knock Correction Advance Max table. I'm using a custom one which is scaled to go all the way to 4.0 load. I'm FI with an ESC, and I've logged over 3.5 Engine Load before. If this prevents the lag I'll know my custom table is causing the problem. I've been planning to scale the MAF after getting the AVCS right. This tune is the closest I've come so far.

[Nah]

Originally Posted by KoolBRZ

I also averaged about 26 MPG on them. I went back to the drawing board using Shiv's stage 2 AVCS tables as a template. Since then my best MPG average has gone up to 37.5. I also wanted smooth acceleration, no hesitation after shifts, quicker throttle response, and better torque between .5 and 1.0 Engine Load. 25 versions later I have these tables. Try these out, give it a few days to settle in, and tell me how they stack up to the previous tables.

Funny, we both made the same changes in from 1.00-1.40 based on shivs template and the info from here.

I'm gonna make the changes now and see how she likes it...

as a reminder... mods are still JDL UEL header w/ perrin 2.5 inch cbe

***Update***
About to flash...

[Nah]

so tested out KoolBRZ's tables. Here's some feedback on how well it did on my 86 w/ a JDL uel header...

Startup was nice

The throttle pedal was "lighter" than before giving me a just little more space before the revs would go up. This is good the gas pedal became more predictable.

Cruising...

Shifting between 1-3k is just a tad rough... barelyyyy not perfect. Probably due to the fact the car is so damn rev happy.

4K and up under all loads is absolute perfection. It's feels as if I have "autorev match" every downshift is slippery smooth. And every up shift is now even smoother than before. No really I had the best downshift to second i couldn't believe it.

Thank you KoolBRZ for letting me test out your tables I'll be keeping them because they are indeed the best tables I have used thus far.

The ONLY thing I would change imo would be in the lower loads between 1-3k its just a tad jerky but still very smooth nothin crazy.

And KoolBRZ if you know of any other tables you've changed to make the 86 even better please let me know lol thank you... In an area where there are so many stock 86's it's nice to know we can make ours a little more enjoyable with some research.

[Wayno]

Have used used the avcs tables from the OFH maps?

Originally Posted by Nah

so tested out KoolBRZ's tables. Here's some feedback on how well it did on my 86 w/ a JDL uel header...

Startup was nice

The throttle pedal was "lighter" than before giving me a just little more space before the revs would go up. This is good the gas pedal became more predictable.

Cruising...

Shifting between 1-3k is just a tad rough... barelyyyy not perfect. Probably due to the fact the car is so damn rev happy.

4K and up under all loads is absolute perfection. It's feels as if I have "autorev match" every downshift is slippery smooth. And every up shift is now even smoother than before. No really I had the best downshift to second i couldn't believe it.

Thank you KoolBRZ for letting me test out your tables I'll be keeping them because they are indeed the best tables I have used thus far.

The ONLY thing I would change imo would be in the lower loads between 1-3k its just a tad jerky but still very smooth nothin crazy.

And KoolBRZ if you know of any other tables you've changed to make the 86 even better please let me know lol thank you... In an area where there are so many stock 86's it's nice to know we can make ours a little more enjoyable with some research.