I agree with brfatal. You should never tune without a wideband. At the same time I disagree that etuning is a last resort. Off the shelf maps and unknown tuners should be a last resort for someone who desires a modified vehicle.
Road Tuning/E-Tuning vs Dyno Tuning
- loads and environment are exactly what the car is going to see everyday
- hood is down, heatsoak is exactly how it will be daily, underhood aerodynamics are accounted for
- you get in the habit of monitoring your own vehicle
- you get an understanding of the tuning process and can see whats being changed
- you get a better understanding of when it is/isnt a good idea to beat on your car
- more involved process. you are the one driving the car. you have control of when to get out of a pull if you think something is wrong.
- time. the process can take 1-2 weeks or way longer....some people send 10 logs a day....some send 1 log a month.....some people pay then take 3-4 weeks to get a tuner there AP serial #. 95% of the time the tuner is waiting on logs from customers...the 5% where they have to wait is because the tuner is either driving or seeing family on a holiday....exct.
- speeding. traffic tickets are a possibility.
- traffic, accidents, old ladies, animals, weather can all come into play on the road
- troubleshooting mechanical issues via the internetz sux teh ballz
Dyno Tuning Pros
- You're at a shop with mechanics who can troubleshoot real time
- Greater level of detail and consistency of power measurement
- Dont have to worry about traffic tickets, traffic, weather, etc
- you get a pretty dyno chart
Dyno Tuning Cons
- load/environment replication. personally i've never seen a car driving down the street with its hood popped and a fan mounted in front of it.
- since the tuning is done with the hood open underhood aerodynamics arent taken into account at all. intake air temperatures are not close to being on the road. coolant temps can also get really high on the dyno.
- Dom @ MPS on road tuning after dyno tuning. "(Detuning on the road) is because you tuned the car with high IAT (on the dyno) and now you need to compensate for the cooler IATs you got in the real world. This is the same misconception most other tuners/shops have in this country. They don't realize that you get more airflow over the car, through the engine bay and radiator at 20mph than you get on the shop floor with 3 fans in front of it. You have to look at the air over the car as a difference in pressure. The under-tray creates a low pressure region under the car and draws air through the intercooler and radiator. Floor fans alone can't provide enough pressure to do this."
06' wrx tr