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Sorry I'm not Bernie but thought I'd help him. Check [ www.racelogic.co.uk ] and read everything under Traction Control if your seriously thinking about getting one. They explain exactly how it cuts fuel and allot of other good stuff. Here is a small cut from [ http://www.racelogic.co.uk/techtrac.htm ] Fuel Cut
The idea of cutting fuel to an engine sets alarm bells ringing in engine builders, as they all know of the
potential disaster of a high revving race engine running lean. Running in a lean combustion mode will elevate
in-cylinder temperatures very rapidly, the denser the air/fuel charge, the more heat the lean burn can generate.
Therefore it is vital that a fuel cut system will not cause a lean burn. The simplest way of preventing a lean burn is to remove more than 50% of the fuel from the pulsed delivery. A
mixture will only ignite if the air/fuel ratio is within a tightly defined window, look at the efforts being put into
making lean burn engines fire on very low air/fuel ratios (1:20 or more). Removing more than 50% of the fuel
will cause an air fuel ratio of over 1:25 and will result in a complete miss-fire, with the unburned fuel passing
out through the exhaust valve. Even if a high air/fuel ratio did manage to ignite, the energy available from the
amount of petrol injected wouldn't be enough to elevate temperatures significantly. Of course the ideal system
will remove 100% of the pulsed fuel delivery, allowing the cylinder to take a gulp of fresh air, and the in-cylinder
temperature would remain virtually unaffected. Prolonged fuel cut on one particular cylinder would cause scavenging of the petrol lining the inlet tracts, and
when the next full fuel pulse arrived, it would be partially reduced in quantity by the re-wetting of these tracts.
Therefore it is often important to manage a rotation of the cylinder cutting to prevent this situation from
occurring. BTW: I am not associated with the group buy and not trying to sell the thing, I got mine a long time ago and still very happy with it... Good luck,
John
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