It's more of a challenge to tune a carburetor to achieve a lean 14.7:1 air/fuel at part-throttle and still deliver excellent and immediate WOT power, but it can be done. For example, if you want to run leaner, go from 80 rear jets to 78s. Standford Curry owns and tunes a '69 Chevy Camaro, an '02 Honda S2000, and a '97 BMW M3. Cruise Tuning. Soon you will be "finding" horsepower and efficiency in all sorts of unexpected places! You can see the power valve add fuel on the LogWorks chart by looking at the Vacuum reading (blue line) and the pink Air/Fuel Ratio reading. This latest development in handheld electronic-power knowledge is the affordable air/fuel-ratio meter. He has won numerous SCCA and Club events, as well as placing first in the 1997 North California Solo II complete series. 2800 RPM is the upper limit for delaying the onset of the main jet system, especially if your engine combo is set up for a low torque peak with high compression & a smallish cam. Setting idle mixture will change when you bolt on the air cleaner. This article is about the song by Thunderclap Newman. [6] Originally titled "Revolution" but later renamed to avoid confusion with the Beatles' 1968 song of the same name, "Something in the Air" captured post-flower power rebellion, marrying McCulloch's sweeping acoustic and glowing electric guitars, Keen's powerful drumming and yearning falsetto, and Newman's felicitous piano solo. Download Pdf. The single reached No. This is where a Q-jet shines, using its small, highly responsive primary side to achieve excellent throttle response for part-throttle driving. The preceding graphic shows that the car is running too lean in third and fourth gear ( Air/Fuel in the 14:1 range) with 80 size jets in the primaries (plus a power valve) and 88s in the secondaries. 4. You can also enable color-coding by clicking on “Colors” and selecting the color scheme of your preference. A version of the song recorded by Ocean Colour Scene was previously used by telephone provider Ionica. At WOT, the engine was actually a bit lean. The chart below shows a good cruise Air/Fuel Ratio (in the 14:1 range) attained at varying load ( Vacuum ) conditions between 2100 RPM and 2400. Because of the cam, intake, and header swap, part-throttle transition fuel was also slightly lean, so we changed to a slightly weaker power-valve spring to pull the metering rods out of the primary jets sooner as load increased.The engine responded with a slightly richer mixture in light acceleration of around 13.2:1, but we still had a slightly rich cruise air/fuel ratio. "Something in the Air" is a song recorded by Thunderclap Newman, written by Speedy Keen who also sang the song. 4. We also replaced the large 0.035-inch accelerator-pump nozzle to a 0.028 to further improve the throttle response. An additional way of looking at this data is through the LogWorks Table and Chart facilities described earlier. If the car idles with the idle mixture screws closed or nearly closed (less than a half turn from full clockwise / bottomed out), you can lean out the idle by substituting a smaller idle feed restrictor for the one currently in it, or you can try using a larger idle air bleed. Main Jet Tuning: The main jets are the focus of most tuners working with a carb, and Innovate’s wideband system makes this the simplest of all the tasks. Instead of a run-by-run view of each line graph, you can very easily combine all of your passes (sessions) and look at them in a table or as a chart. If your Air/Fuel Ratio is fine in first and second but starts to get too lean in third or fourth, you may be draining the fuel bowls faster than your fuel pump & lines can fill them. Use the LogWorks View / View Chart facility to build a table for each set of high speed air bleeds you data log. With the car on the dyno or on a flat road, run it up to 4000 RPM in 3 rd or 4 th gear, then start recording the session on your Innovate equipment. For your initial work, you should shoot for WOT air/fuel ratios between 12.5:1 to 13.0:1. If you go too lean on the idle-feed restrictors, the engine will surge at cruise and hesitate under light acceleration, since most engines don't like to accelerate at lean air/fuel ratios. Once the download completes, you’ll see a new window appear with a graphical representation of your session – similar to the following picture. If you are five or six jet sizes (or more) away from the box-stock configuration, it's possible there's something else wrong with the carb or your engine. You can easily see that the Air/Fuel Ratio dropped from dangerously lean 14.5:1 to safely rich 12.5 – 13:1 through richening the main jets by a factor of 3.5 jet sizes (up 3 in the primaries, up 4 in the secondaries). Assuming you’ve properly set up your idle circuit in the 13:1 to 14.5:1 Air/Fuel Ratio range for zero load (parked) idle and partial load (under 1900 RPM), try temporarily jetting the mains over-rich. In 2008, this song appeared in a Coca-Cola commercial in Taiwan. As the log from a track run illustrates, the jetting was initially too lean in third and fourth gear, but richened with RPMs which at least rules out fuel delivery issues. 1. Spikes like these may point to a fuel delivery problem, so check your fuel bowl levels. If you tune the idle-feed restrictors too lean,the engine will most likely suffer from an off-idle lean stumble as a nearly indicator that you've gone too far. Power Valve Tuning Idle Tuning An ideal accelerator-pump shot is just enough to maximize acceleration.Additional fuel only kills power. Main Jet Tuning For cars with automatic transmissions and no “idle-compensation” solenoid triggered by the trans or A/C, you may face a tradeoff of idle quality when the transmission is in Park compared to when it’s in Drive. While these are lean ratios, they don't hurt the engine. With an hour or two wrenching and running a few wires, you can capture data that allows you to track your air/fuel ratio, engine RPM, acceleration gs and vacuum (load) as your car travels down the strip. When a cylinder misfires, the air and fuel do not combust, meaning the oxygen in the air moves into the exhaust where the O2 sensor will immediately pick up the additional air and indicate a lean condition. Assuming you have the right size of carburetor for your application and that your engine’s in good working order (no fuel leaks, no ignition glitches, no parts rattling around in the oil pan), it’s easy to get up and running and tap the potential of Innovate’s tuning solutions. This tweak improved Air/Fuel Ratio in the car’s cruise range (13 PSI through 16 PSI, from 2000 RPM through 2500) as shown in the green highlight. Innovate’s point and click interface also makes it easy to stretch the timeline (click the magnifying glass and then click on the timeline across the bottom of the chart). (Installation Tips). An album, Hollywood Dream, peaked in Billboard at No. Carb Table Comparison Showing Delta between "Before" & "After" AFRs. A commonly used approach is to select RPM as the Horizontal X axis and Vacuum (or MAP) as the Vertical Y axis, and select Air/Fuel Rati o to fill in the Chart Content. If your Air/Fuel Ratio is between 13.0:1 and 13.5:1 in all gears, you’re in great shape. The Innovate meter reported an idle mixture of around 12.0:1 that went lean at around 13.8:1 as the throttle opened up in mild acceleration. The song was featured in a number of episodes of 1960s-set UK police series Heartbeat. Cruise Tuning: Many tuners think that main jets control most of the fuel flow during cruise RPM – 2100 to 3400, depending on gearing. In the UK, a follow-up single, "Accidents", came out only in May 1970 and charted at No.