if im right ur on about the ecotek valve these are r a little valve that sit in the brake servo pipe, it improves the air molecules or somthing. it cost £45
click on engine on the left bar, thers a topic on it
From what I know it works by swirling the air prior to it entering into the intake manifold. Works like stirring coffeemate into your coffee. Provides a more even mixture of air and fuel and this will promote better combustion... I think. There used to be a product some years ago called the cyclone which did the same thing. However, it did so by being a sort of vane installed within the air intake hose. Seemed to make sense for low rpms but theoretically, it would have been an obstruction at higher engine speeds.
Anyway, back to my question above: I ask because a friend of mine tried it on his Mk III GSi and he got more idling problems than before!!
(hands up) I have one - I carn't believe this little thing costs so much money for what it is. anyway, i had a little problem putting it on the servo pipe because it has to go as near to the manifold as possible (within 6 inchs anyway) on the manifold side of the one way valve and there isn't much pipe to play with. but it went on anyway. All we have to do now is sit back and see what happens, but I do have to say that the early signs are something seems to have improved, it is definately running better. But I have found out from reading the instructions that is best to get the CO levels checked first, then put the ecotec on and things should get better still. I have yet to do that. but when I do, I just close of the valve and open it up again afterwards. but like I said its a bit early to say yet but it does look promising, for my 90 cav 8v. I'm not sure how to do a link, but go to www.cleanburn.co.uk
I was interested in one of these gadgets, so I went onto their web site to look at the test results they use to back up their claims. in the Evans Halshaw test, claims of 27.975 mpg at 50mph and 22.529 at 70 mph are made with the device fitted to a Cavalier with Multec injection. Vauxhall's figures are much better without the device, 49.6 mpg at 56 mph and 38.2 mpg at 75 mph. Noe I can't tell whether the device really makes the fuel consumption 40% worse, or whether the test is useless. I am very sceptical whether any amount of air in a small servo pipe can make significant difference to the amount of air being drawn in. If it's really any good, don't you think GM would fit it to every car they make across the world.
You noticed they dont claim an power increase, but really promote this fuel consumption benefit. Ive read the site over and over, and they keep claiming their product weakens the mixture slightly by adding more air.
Now forgive me for sounding like a gimp, but is it not this weaker mixture (less petrol) thats giving the better mpg's and not the device swirling the mixture.
My point is that 22/23 mpg from a Cavalier with the device fitted, at a steady 70 mph is diabolically low. Vauxhall's 38 mpg is easily attainable on long motorway runs in light traffic, if you're prepared to stick to that speed. If it doesn't improve the fuel consumption or increase the power, what's the point of this device?