Dyno run

[NASSTY]

Let me add as someone who has gone down the path of self tuning.

There is no real mystery to EFI. At the end of the day it's just about how much spark and fuel. Map the fuel to achieve your desired A/F ratio and map the ignition map for the timing. For a factory EFI most of the work has alreay been done. A tuner is just tidying up the mapping as most factory cars run too rich at WOT. This is because a factory car will need to operate in any conditions; such as hot weather towing a boat etc etc.

Once a tuner has developed a tune which I dare say won't take too much of their time to do, all that's left to do is pay for the license of the software which the consumer does when the product is bought. After that, tuners usually just charge for dyno time if you want a custom tune.

So where's the problem?

I have to agree with Les on this one especially the bit about the perceived self importance that some tuners convey to motorists.