I have been running the TDI tune for a couple of weeks now and I must report I am very happy. The throttle response off idle is the most noticeable, almost eliminated the turbo lag. I like the idea of not changing the ECU map, just trick the sensor inputs much like the Johnson lift rods do, but in this case the boost sensors. And it is easy to put back to stock. I highly recommend this mod. It was an easy tool-less install, although one of the sensors is tricky to access. They claim an increase in MPG with HP gain, coming from the modified Diesel truck world this is a new experience for me. So I agree with their increase in HP claims, guessing I’m around 450 now plenty for me. It was easy to find a location to mount. If you go on their website and they don’t show one for our P400 application email them, they have one.

 

Awesome! Really considering picking this up. How is the shifting? I know when I delete my 6.7 it hunted a lot more then I cared for. Any other noticeable changes besides the increase in power?

Thanks!

 

No noticeable difference in shift points, just more enjoyable and welcomed smooth power.

 

If you live in California, don't bother. Due to CARB regulations, they won't ship to CA residents. At least they'll let you know before accepting your order (and money.) Did you get the optional BT interface?

 

Have you noticed an increase in mpg? Can you record a 0to60 time

 

Hard to beat this pricing for Black Friday. It's less without optional Bluetooth to control the programs from an app but I can't see going without that feature. I'm in. Ordering tomorrow. Thank you @DefXBill

Data sheet for p400 attached.

 

They have for P300?

 

Yes. but pls verify with them.

https://tdi-tuning.com/en-us/car/lan...uning-box-chip

 

Damn thats a bummer. Thanks for the heads up.

 

I know next to nothing about tuning.

Increased fuel economy, torque and HP.

Given the ubiquity of the non-free-lunch-hypotheses, where's the rub?

I'll take my answer off the air.