Liberty GT 2007 Auto DBW tuning.

[Sheik Jabooti]

Has anyone successfully tuned the DBW tables for a AUTOMATIC Liberty GT. Currently tuning with xtreme race tuning and we are having a bugger of a time getting a smooth transition through the 2000-3000rpm range. Around 2500rpm the car surges and bounces +/- 200 rpms. Very annoying and not very driveable. We flashed just those DBW tables back to stock and it all goes smooth again. Seems that the DBW disagrees with the transmission control unit.

Any ideas would be appreciated. A reference to a working set of responsive (ie. not stock) automatic DBW maps would be even better.

Cheers

[B4ITZUP]

I'm keeping my eye on this thread

I'm going to get mine tune in a couple of months, hopefully there's some hint on here to help with DBW

at the moment, taking off, that slight wait seem like forever

[<GB>]

My car had a few issues with dbw not sure if it was the tuner... Or the car, mines manual...

When it surges is it when cursing at light throttle and 2000-3000rpm? Cause that's what my car does

[Sheik Jabooti]

My car had a few issues with dbw not sure if it was the tuner... Or the car, mines manual...

When it surges is it when cursing at light throttle and 2000-3000rpm? Cause that's what my car does

Yep, that's exactly it. Generally when going off from lights but also noticed at cruise. Most noticeable when going up a hill or under light load. Always in that same 2500rpm range.

Who did your tune by the way?

[<GB>]

My car had a few issues with dbw not sure if it was the tuner... Or the car, mines manual...

When it surges is it when cursing at light throttle and 2000-3000rpm? Cause that's what my car does

Yep, that's exactly it. Generally when going off from lights but also noticed at cruise. Most noticeable when going up a hill or under light load. Always in that same 2500rpm range.

Who did your tune by the way?

also when the car goes from open to close loop that causes issues too.


my car was tuned by some guys in melbourne and im going to another place as a few things have happened with another liberty that went their.... and my car leaned out on the liberty dyno day...

[west_minist]

I dont have issues with highly tuned cars. I think its because of the extra torque that keeps the tranny happy that it either locks the TC or it is unlock. The +-200 reference the locking. I don't see any fueling issues.

Please do this for me. Try hard to attain what I want. Anyone who has the issue can send me a log. Just log the car in that area. Log throttle, accelerator, afr sensor #1, rpm, etc. Log and create the variation.

Sheik, I sent you an email. I have some time on my hands in terms of tuning. Drags here in Barbados is finish, so I don't the stress any more, except I.T. related.

[PoidaGT]

I had the exact same problem with my GT after it was tuned.

It is more noticable in 3rd at low speeds when you floor it. Not so noticable in 2nd or 1st gear.

It is really annoying

[Sheik Jabooti]

I had the exact same problem with my GT after it was tuned.

It is more noticable in 3rd at low speeds when you floor it. Not so noticable in 2nd or 1st gear.

It is really annoying

I think a lot of tuners slap on the DBW maps that work for the manuals but don't do any real world testing off the dyno. If they did, they soon find out the auto's don't like those maps.

If Edward from Xtreme Race Tuning is able to get my auto right, you might want to contact him to sort out your DBW setup.

Cheers

[PoidaGT]

I'm getting my 100K service done next week by my tuner so i'll get him to retune it then.

[PoidaGT]

Hey Guys

I had my tuner (MSR) check out my GTB today with this 2-3000rpm issue and he was really surprised.

We easily managed to replicate it but what suprised him was what actually was causing the problem.

He can see that when you floor it at low revs, the throttle actually advances initially and then retards, then advances again.

He hadn't noticed it before.

Unfortunately he says that it is a set design fault with the Subaru ECU and he can't tune it out.

I only notice it in 3rd gear so i'll have to make sure i change back to 2nd in future.

[jslayz]

hey, humor me and pop some octane booster in and post your findings.....subarus can be tuned with a lot of offboost timing advancement to get max torque and hence could be producing a ping then it retards and then it tries to advance and pings again.

Just a theory.

J

[KiDo_Tuning]

Hey Guys

I had my tuner (MSR) check out my GTB today with this 2-3000rpm issue and he was really surprised.

We easily managed to replicate it but what suprised him was what actually was causing the problem.

He can see that when you floor it at low revs, the throttle actually advances initially and then retards, then advances again.

He hadn't noticed it before.

Unfortunately he says that it is a set design fault with the Subaru ECU and he can't tune it out.

I only notice it in 3rd gear so i'll have to make sure i change back to 2nd in future.

Easily tuned out actually, the 5EAT ECU has a full throttle protection feature in the throttle tables similar to the MY11 STi 5EAT auto(AZ1G500J ROM). Change the throttle tables to something sensible and the power delivery is smooth as silk, proven it on numerous Forester S Editions

Plenty of my customers know I can get the 5EAT shifting like a DSG box Smooth power delivery and never any hesitations(other than the TC light giving you a sunburn!)

[yipming]

hey, humor me and pop some octane booster in and post your findings.....subarus can be tuned with a lot of offboost timing advancement to get max torque and hence could be producing a ping then it retards and then it tries to advance and pings again.

Just a theory.

J

Kinda hoping not. And shouldn't be seeing how Michael South has been tuning Subaru for 15 years... pinging should be picked up fairly easily from the probes while on the dyno.
My Subaru is tuned there.

BUT, when I floor it from say 3rd gear, my rev jumps pretty much straight away to 3k stall point, so I haven't really experienced this surge around 2.5k.
Will try and see if I get that the next time when I go for a drive.
Which mode was being used? I, S or S# seeing how the gearbox seems to behave differently with each mode.

Oh, and I have a transmission cooler so perhaps that's why I am not feeling it .....

[jslayz]

Hey Guys

I had my tuner (MSR) check out my GTB today with this 2-3000rpm issue and he was really surprised.

We easily managed to replicate it but what suprised him was what actually was causing the problem.

He can see that when you floor it at low revs, the throttle actually advances initially and then retards, then advances again.

He hadn't noticed it before.

Unfortunately he says that it is a set design fault with the Subaru ECU and he can't tune it out.

I only notice it in 3rd gear so i'll have to make sure i change back to 2nd in future.

Easily tuned out actually, the 5EAT ECU has a full throttle protection feature in the throttle tables similar to the MY11 STi 5EAT auto(AZ1G500J ROM). Change the throttle tables to something sensible and the power delivery is smooth as silk, proven it on numerous Forester S Editions

Plenty of my customers know I can get the 5EAT shifting like a DSG box Smooth power delivery and never any hesitations(other than the TC light giving you a sunburn!)

Like a DSG, so no shift delay, I'm in.........unless you are exaggerating ...

[KiDo_Tuning]

My DBW is NOTHING like stock and for good reason. I fix too many tunes with slapped together DBW settings, the auto needs strong RT figures to get lockup I have plenty of logs to back it up as well

Comments from a TD04 equipped Forester SH9 XT but cannot post logs as *.csv format is not allowed. My S Edition, STi auto and Liberty tunes are even better

it's quick Matt, it's quick! LOL see attached logs.

Did a 1500rpm launch for 0-100 in just 5.8 secs!

Car feels great again now and obviously will get better after bit more driving...super happy mate. So happy i got the auto now

So far, I have gathered the following 0-100 times at each stage of tune:

Stock car + tune = 6.5 @ 2000rpm launch
Dump + tune = 6 flat @ 1800rpm launch
Stealth TBE + Tune = 5.8 @ 1500rpm launch

Regards,
Dan

Another client in Brazil running 12psi due to 87RON fuel