Anytime you see the words "Gain HP AND Improve Gas Mileage"...

Run away.

 

Some brands (such as GM) have, or at least had, replaceable computer chips which can indeed make significant changes in performance. As far as I know the only way to do this with a Toyota is having the the computer 'flashed' with a new program. There are some 'speed shops' around here which can do this but it's not at all cheap. I think what you're looking at is just a resistor or small circuit to change the input from one sensor so the computer gets a false signal. I've never heard of good results from such devices.

 

Thanks Dave

That's the same impression I got, namely that these chips trick the ECU. I've been reading about Hydrogen on Demand, and it would appear they also use sensor's to trick the oxy sensor, etc, into thinking everything is running as it should be when hydrogen is added to the system. So far I've improved my gas mileage by 2 mpg, simply by adjusting my driving technique and adding some hypermiling tricks...been getting around 30.6 mpg on my recently purchased 1987 Camry...in the city. Can't complain about that, considering what people with larger, heavier vehicles are getting!

 

You can adjust the AFM to both improve power and fuel economy.

Just throwing that one out there...

 

Dont mean to butt in, but how do you adjust the AFM?

 

http://www.toyotanation.com/forum/107-camry-solara-lounge/82158-3s-2vz-3vz-free-power-oh-my.html

That.

 

Well...there it is! Thanks, very interesting, think i will give it a whirl.

 

I did it. It isn't a giant improvement but coupled with a CAI and a straight-pipe exhaust I can hit 80 in the same stretch of road where I used to peak at 72.

 

I think anything would be an improvement over the nonexistant low end torque this car has now.