Air Fuel Ratio (AFR) is the ratio of air to fuel in the combustion chamber during the power stroke. This ratio is very important to know when adding on any type of forced induction, whether it be a super charger or a turbo.

After installing a turbo on your Honda Civic it would be a good investment to install an Air Fuel Gauge to monitor the Air Fuel Ratio while the engine is running. I would also recommend taking your car to a shop that has a Dyno to get it tuned properly, otherwise running your engine too lean will blow it up and you’ll have to rebuild it.  Below is a link to D-Series Forums that gives a little bit more information about air fuel ratio while running a turbo.

Click Here for Link to a forum post about air fuel ratio

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Adding on performance mods on your engine will only go so far without a proper Air/Fuel gauge, otherwise you could risk running your engine too lean and blow it up.

The most popular one on the market now is the AEM Wideband UEGO Controller and sells on eBay for around $200-$300. There is also the Inovative Motorspotrs LC-1 Kit with red or blue gauge which is around $289. Well I was searching around today and I found an alternate solution the JAW(Just Another Wideband) reader for $115 assembled with display. The only other major part that you will need to make JAW work is a Bosch Wideband sensor which sells for around $50-$70.  Click Here to see a video of the JAW reader in action.

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