Punknoodle
The problem with that is what if I'm away from town and need access to it, for instance at a race meeting in another state? I now have no ability to go to another tuner without getting a complete retune, and I think if I've already paid for it, that intellectual property belongs to me, as I was paying for the time spent doing the work and it'sy vehicle..
Long time since I read this thread.
They are probably thinking it is their best interest and your best interest to leave the tune alone. Slip of a finger in the wrong menu can mean blown engine, fried ignition coils, and so many more issues. From past experience I will password lock ALL tunes if the ECU will allow for it. Enable closed loop correction and send it on it's way.
However I do not with hold this information from my customers. I merely keep a copy of the tune for my own records. Should an issue arise I just compare data logs or MAP's...
There is always the tricky part in the blame game when someones engines goes *POOF* at the end of it all. Customers honestly do not care about the guys who tune their ECU's. I really feel many are looking to someone to blame when it blows from poor design (lack of expected output) or poor assembly. Or why you see so many people with over inflated dyno numbers (catering to customer expectations).
In the end, you have the right to access the tune. Unless you have some type of written agreement they are the only tuners (we do this with race teams that only our guys tune their cars @ events), get the password from them. All bets out the door when you begin to modify their MAP's I'm sure...
Every tuner has preferences. Personally I will not touch a car unless it meets the following stipulations (what I feel is needed for a proper tune).
- Complete Engine Build Spec (if you don't have this your engine builder is an outright hack.)
- Wideband O2 in the exhaust system and NOT clamped to the end of the exhaust.
- Additional O2 bung for me to run my Innovate LM-2 or dyno O2 for comparison.
- EGT probe for EACH cylinder or rotor.
- AIT reading not taken pre-turbo (why people do this is beyond me and I charge hourly to properly re-route this post turbo to the TB elbow or intake manifold).
- Proper electronic stand alone or ECU built in boost control.