1 for idle (stoich). For load, generally speaking, somewhere in the 0.78-0.83 range.

 

I sent the the Datalogs and no reply yet!!

This is whats making confused , i have been using it for over a year ont he track 25 lap sessions! and the road with a lot of hard driving and the problem didnt happen before , it was running 100% strong in all conditions!! I will change my plugs/coils and check FPR and fuel pump/ and replace the MAF/O2 sensors along with the solenoid valve.

I remember someone who has an RS tuning car that says the car has an overboost in low rpms in gear acceleration until full boost is reached? this probably might be the issue on 3rd gear ?? could it be that the fuel pressure or whatever caused it takes sometime to make the lambada react? Then the AFrs are settiling down and looking safer in 4th gear since it was gear to gear acceleration and not low in gear acceleration which enables the car to overboost?

I will try to do a run from 1st or 2nd gear - 4th gear high rpm , and see what happens.

 

check your email.

 

It may be just a fuel filter. Otherwise why don't you just contact someone like Todd K at Proto. It may be cheaper in the long run and at least you will have a tuner that will respond to you for future needs. The way I see your datalog is that your tune it is running way too lean. As you approach high load your lambdas should be dropping. In your case you are constantly running >.9 all the way through. Your engine is not happy, running hot, causing it to knock, and then the panic button is pushed where the ECU is dumping fuel and reduces timing to compensate. Your tuner should be able to tell you what is programmed so at least you can see if you are hitting those programmed parameters in your datalog. If you're not, then it's likely a mechanical issue but without knowing how your tune is programmed, it's anyone's guess.

 

Todd K didnt heasitate to help me out , he was very helpfull and gave me some of his time even though i never bought anything from him before, he definatly won a future customer.

Lets see how it goes these few days after i check and change some parts. I will do a few more before and after datalogs to see how the car reacts from 2nd-5th redline gear to gear acceleration..

 

Email well received

 

I'll be working on 997TT in qatar this friday so if you want to have some work done to your car let me know.

wish you best of luck

 

chris may have a point here
check ur plugs!

 

Any updates?

 

Turned out to be a bad tank of fuel as RS tuning and other people sugested..
the problem is gone for 2 months now..