![]() ![]() If you were to graph the boost/timing curve, as boost increases spark lead goes down. The other factor being the fuel’s propensity to auto-combust (ping or knock) due to the higher cylinder pressure and air temperature.įor these reasons as engine rpm increases, so does the output of the TorqStorm supercharger, and the ignition timing will need to be pulled back (less advance). The higher level of volumetric efficiency (cylinder fill) will inherently increase the flame speed and thus, less of a head start is needed to keep up with the piston. It must be noted that when a TorqStorm supercharger is installed that there are a few dynamics that will impact the amount of spark advance. But this will not be true if the advance curve was NOT optimized before the TorqStorm supercharger was installed. In that case, it should want less advance at every operating speed and load when supercharged. ![]() Suppose the timing curve was optimized with the engine in naturally aspirated form. In that case, it may want 8 or 9 degrees BTDC now.ģ: The additional air in the cylinders provided by the TorqStorm supercharger will increase the flame speed. For example, suppose the engine idled best with 6 degrees BTDC before the TorqStorm supercharger is fitted. This does not mean you cannot use a different brand, but the fuel’s characteristics will potentially alter the tune.Ģ: Though a TorqStorm supercharger has the lowest parasitic loss in the industry, you may find that the engine likes two or three degrees more base timing advance at idle due to its work to turn supercharger. The following guidelines will help.ġ: Tune the engine with the gasoline brand and octane that you will predominately use. Each engine will want its own unique base and total timing settings. It is employed to achieve the rate of timing advance and total timing. The base setting does not require a dyno. However, it can be done on the street or drag strip, but that data is often skewed or inconclusive. The most effective means to accomplish this is on a chassis dyno. To accomplish this, you will need an advance timing light and an applicable mechanical advance tuning kit. To truly unleash all of the additional power a TorqStorm supercharger is anxious to provide, a complete timing curve must be created. As a result, it will run the best and make the most horsepower and torque. Just as a cat purrs or a dog wags its tail when happy, an engine will reveal to you when the ignition curve is producing the correct LPP. When developing an engine, the car companies use in-cylinder pressure probes and sensors to identify the crankshaft’s rotational position. It is replaced by manifold boost pressure.įor this reason, the tuning of the ignition advance when a TorqStorm supercharger is fitted to an engine with a carburetor and distributor is left to the base setting and the mechanical advance system. Once a supercharger is added to the engine, other than at idle, the amount of vacuum in the induction system is minimal. The vacuum advance aims to improve fuel economy and throttle response at light load and part throttle when manifold vacuum is high. At this time, the total timing is the base setting along with the mechanical advance. Thus, any advance introduced at part throttle is eliminated. The mechanical or often identified as centrifugal advance, is the additional lead (BTDC) that is added by the movement of the distributor cam and rotor at higher engine speeds.Īs its name implies, the total timing is the sum of the three areas.Īt full throttle, there is a minimal signal available to the vacuum advance canister. Vacuum advance is the amount of advance (BTDC) that alters the timing above the base setting. So it takes a little time and effort to get everything set, but in the end, it's well worth it.Base timing is the position of the distributor in the engine block. Springs can be replaced to change how quick the timing curve comes in. If total mechanical advance is to high or to low, then you have to change the restrictor plate or modify your current one. In order to find this number, you have to have timing tape on the balancer or a dial back timing light. Now the back side to this is that now that you have the initial at it's peak performance, the total may or may not be totally off. ![]() By using the vacuum gauge to set initial, you are finding where in the timing scale, the engine draws the most air. The higher that number, the more air being drawn into the engine. So by putting a vacuum gauge on your engine, you are basically seeing the rate of air into the engine. The more air you take in, the more fuel you take in. That's why better flowing heads and intakes produce more power. ![]()
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