Here is a suggestion. Take your £49 + p & p and throw it down the toilet. You will then notice a similar performance increase when you next drive your Kia Sedona.

All these tuning boxes are simply daylight robery. Why people think a man in a shed can better the R & D carried out by international Motor Companies with untold R & D budgets beggars belief.

Yes they do damage - your wallet.

That's not a chip, google search EPROM, that is a chip like the ones we used to fit to ECUS in the old days. Now cars have the EPROMs flashed via the ODB port. The thing on ebay is just a couple of cables and a box that you will be asked to fit inline somewhere. May even have an LED on it..

Edited by Hamsafar on 24/10/2013 at 20:51

It looks like one of those devices that tricks the ECU into increasing the fuel rail pressure by changing the signal from the rail pressure sensor.

OK, as you haven't had a constructive explanation of what these things do, I'll do it for you.

Firstly, yes, if it's too good to be true, it probably is, and this thing really is too good to be true. In fact, it's a pile of s***. If your car is petrol... STAY AWAY. If it's diesel, you can probably get away with fitting one but I still don't recommend it.

All they are is a resistor in a pretty box. They trick your ECU into thinking that the temperature of the air is colder than it really is, as such, to compensate for the 'supposed' denser air, the ECU alters the fuel mixture making it run richer. On a carb, the equivalent would be driving around with the choke out 25% at all times.

On some cars, there might be a slight performance increase, although we're talking minimal and only when the air is very cold. I imagine in summer, you could end up with a performance reduction. While that is based on your car and weather and what not, here is what is true (simple physics):

• Too much fuel (especially in a petrol) leads to detonation (aka Pinging/Pinking), poor idle, Cylinder bore wash (essentially too much fuel washing oil from the bore walls... this is very serious and is a killer for engines), and will increase engine wear by quite a lot.
• Too much fuel results in an exponentially higher number of fuel emissions causing your car to almost certainly fail it's next MOT (unless the chip is taken off).
• Too much fuel will result in much lower fuel economy.

I personally wouldn't touch this mod on any car, but as I said, I especially wouldn't touch it on a petrol car. Diesel has some lubricating factors which would probably allow this mod to work slightly better. I imagine fitting this to a petrol car is a great way to introduce some serious problems.

There is a variation of this mod called the eVry mod, which is where instead of using a 10p fixed resistor (which is currently sitting in that box waiting for your £49), you use a potentiometer and then you can vary the setting. Again, you're unlikely to notice ANY performance gains whatsoever, but I know a number of people who have this mod installed to simply make their car sound throatier when they take it to car shows but they all own diesels and they certainly wouldn't fit it on a petrol.

Here is a video of eVry mod (notice the filth coming out when set to 80% and also the dreadfully lumpy idle):

http://www.youtube.com/watch?v=4rRJrUKv5Hk

Edited by Skezza on 25/10/2013 at 11:39

>>Too much fuel (especially in a petrol) leads to detonation (aka Pinging/Pinking)

Sorry, can't agree with that. Advanced timing/lean mixture, maybe.

Correct

In this particular product, its connected to the fuel pressure sensor - its simply a scaling device that fools the ECU to run higher pressure in the fuel rail than normal, causing overfuelling.

Pump and injector life will be shortened and borewash is highly likely leading to premature wear. Lambda probes should keep the mixture from running too rich, which otherwise would destroy the CAT.

Many modern engine/gearbox combinations are limited by design in how much torque can be handled by the gearbox/transmission. Too much torque and early transmission failure.

Edited by brum on 25/10/2013 at 18:57