Your post got me wondering if possible. If so, that could be one great Android app with a wireless ODBII module!That is different from the Volo chip which claims to modify the fuelling using the OBD2 port...
They look genuine, they don't list any Suzukis though.This place seems like a legit ECU / chip mod company. Then again they charge around $400 to mod your ECU.
JET Performance Products, Import & Domestic Performance, Performance Kits, Fuel Systems, Transmissions
But what can you change using the diagnostic link without using a bootloader?I dismissed Volo as a scam so didn't bother to look at their web site until now. In concept what they are saying and the method they are doing it by appears possible with the limited reading I've done. For $90 it sound a bit too good to be true but keeping in mind the cost of the electronics is very low, $90 still makes them a nice profit on the hardware. The one thing that makes me very suspicious is that they appear to have a chip for every imaginable car. It's a lot of time consuming work to make custom fuel maps. I don't see how they can do that for so many models as each are different. Therefore, I would guess they are doing something more generic than specific with their device.
With older cars it was often easy to get more power with generic mods. Bolt on a new manifold, a big 4 barrel carb, some headers, and you were good to go. However, most cars now are very well tuned to extract the most power from the motor while being fuel efficient. So I'm skeptical of any generic devices claiming to boost power and/or MPG.
Volo has a 30 day return policy. May be worth a try. Use your credit card to buy it so if they don't return your money you can do a charge back. Interested to see if anyone gives it a try and the results they get. There are some very accurate iPhone and Android apps to record your 0-60, 1/4 mile, etc time. I'd do several runs before and then after to see what happens. (Use same conditions such as location and temperature so results are meaningful. Going only off the seat of your pants feeling won't tell you anything.)They claim it may take up to 120 miles for the ECU to accept the Volo new mapping so keep that in mind.