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Originally Posted by ashtal
Quote:
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Originally Posted by MikeWarner
Correct, it is not making any changes yet - this will be setup on a rolling road.
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Any time soon ?  I really hope it works well. Can you just explan how and why it will give more power ? I kind of got an idea but, might be wrong. |
An engine is being over-fueled for the purpose of keep the incylinder temperature down to suppress detonation. This safety measure is often adpoted by the manufacturer as well as the aftermarket tuning industry.
Engine produces best fuel economy at afr 14.5:1 upwards, but also produced high combustion temperatures. Flames colours are often blue rather yellowish similar to setting up a bunsen burner.
Best power is generally obtained around 12.5:1 afr.
Best torque around 11.9 afr. Richer afr (cooler burn) enables the ignition timing be more advanced and hence more torque.
Due to warranty issues and reputations, tuners often tune the afr well below 12.5:1. the afr ranging between 10:1 top 11.5. almost as much as 20% extra fuel is being used to keep the engine running cooler.
For those who doesn't care about economy but just want to keep the engine safe should read on... Excess fuel burns with a yellowish and sooty flame. Over rich afr produces a great deal of carbon monoxide. Carbon monoxide only yields 30% power of carbon dioxide so your precious oxygen is being carry away as well as neat fuel out of your exhaust pipe.
The little unit basically tries to shift the rich afr towards something approaching 12.5:1 in presence of WI. Since onlyone part of water is being used to do the same job as injecting six times amount of fuel.
See the chart below: (only 3% w/f ratio is enough to reduce your fuel consumption at WOT by 20%)
The proposed unit has a certain amount of failsafe mechanism inbuilt. It constantly monitors the lambda value, if it drop below a preset point, it disables the MAF converter. Converter automatically switches on when WI is enabled. It can also trim the MAF voltage in relationship with the amount of water flow if a water flow sensor is used.
Who knows, if a car is equipped with a Wide band lambda sensor, you can preset your desired afr with this unit.
Cannot comment on the MAF sensor failure - it will depend on what output it gives after failure.
Richard