I don't have any logs taken from OEM scan tools if that's what you are looking for?

Oem ring gap is to tight for forced induction. There's a lot of generic information on line about ring gap settings for boosted applications. Lots of information and videos on how to set ring gaps. Your issue isn't the motor or what boost level to run it at. It's the transmission. There's no off the...

Mazdaspeed people use the stock 2.5L bottom end with the stock 2.3L DISI head on it as a cheaper solution to replacing a blown up motor. Gap the rings for boost and most people have no issues running 1 bar or a little higher boost. Yes, people do that, but those engines do not last. If you want to ...

I'd say it's the opposite of what Mituc is saying. Mazdaspeed people use the stock 2.5L bottom end with the stock 2.3L DISI head on it as a cheaper solution to replacing a blown up motor. Gap the rings for boost and most people have no issues running 1 bar or a little higher boost. In the Miata worl...

It's not a Versatuner issue. I've seen this with OEM scan tools. You can try playing with some of the closed loop/open loop settings to get the car in open loop all the time and see if that changes things. Otherwise you wont be able to do your calculations in megalog viewer. You'll have to do it man...

Short answer. Yes it could be causing the jerking.

Start up a new thread, post your Tune file and the Logs.

Trying to understand how this works, when my accelerator pedal position never seems to register above about 67% on my 2012 mazdaspeed3. Relative throttle position seems to cap out at 77%. How do you ever see a pedal position at 98% or more?? On Gen2 Mazdaspeed 3s the throttle generally maxes around...

I'd change it by 10 to 15%..

I'm not positive but I'd think if the fuel trims were the issue it would be throwing a fuel code. From what I have researched the p0101 can be for 10% variance in expected mass air flow values. Is that correct? That is a possible reason for the code to be set. Try adjusting the MAF minimum/maximum ...

Tune in Lambda... tell the ECU what fuel you are using under fuel specific gravity.. Use the built in calculator to figure out what value you use... Your ECU is tuned from the manufacture using Lambda. Log in Lambda... Stop living 20 years ago thinking in AFR's... Lambda doesn't care what fuel you a...