2005 JDM 2.0GT Auto - Throttle Woes

[le_sjo]

Hi all,

 

I am somewhat of an experienced calibrator but at the moment don't have access to the maps in my car due to being locked down by a tuner using EcuTek software.

 

The car is a 2005 JDM automatic 2.0GT which uses the EJ20X engine. Basically the first quad AVCS engine Subaru put into production. And it has DBW. Which is my problem!

 

So the problem I have is two-fold, and possibly related:

 

1) Car switches from eco map to sport/normal map above an indicated 70 mph

 

2) When in sport/normal map, throttle response is far too digital. Slightest change in pedal position causes huge surges in torque.

 

This makes cruising above 70 mph a real miserable and fuel-consuming experience. Slightest bump in the road and the resulting foot movement causes the turbocharger to spool and no doubt go open loop for the duration.

 

I have some theories on resolving this problem:

 

1) Adjust the vehicle speed value it uses to change maps, e.g. raise to 100 mph

 

2) Re-calibrate the DBW tables for the sport/normal map

 

3) Damp down the wastegate control at low pedal movements/transients

 

 

I'm just wondering if anyone else has come across this type of issue? I've not done any data logging yet but I really should to see exactly what's going on.

 

I do have an ecuedit licence I could use on the car, but that'd mean calibrating the car from scratch as I can't get to the current calibration. JDM cals are a bit detty in the UK as our fuel is of slightly lower knock resistance than Japan. I could just take a couple of degrees of spark out everywhere at high load from a stock cal I suppose and go from there.

 

One last thing worth mentioning - car is stock apart from a full exhaust with high flow cat. Previous tuner hinted they sometimes adjust throttle tables when these cars have full exhausts. Sounds a kludge to me.

 

 

Thoughts and useful comments appreciated

 

 

Thanks

[west_minist]

Get the Pro license and reflash. Download the rom for the car on Re. You will be good to go. You can then tune however you want.

 

I myself and may other E-Tune. Don't limit yourself to being lock