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above : MSD SCI Ignition, Blaster SS coil & MSD Tach Adapter.
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above : MSD SCI Ignition, Blaster SS coil & MSD Tach Adapter.
The ignition system in a car is supposed to give you total ignition of the air/fuel mixture in the cylinder. Generally the larger the spark, the better the light up will be of the mixture. The stock ignition consists of two parts, the primary (12v) and secondary circuits (steps up the voltage). Combined these parts help produce around 30,000 volts. Luckly for us the GTi already has a very good system stock. However like all things, when you start doing major mods (adding a turbo or nos system) the stock system will have some trouble lighting the mixture at high rpms. On a dyno you can easily see this when the the line starts to get rough in the upper band. Often by adding a aftermarket system you can improve the ignition of the mixture and get back the power you were loosing when the line was rough. On a lightly modified GTi engine you can expect between 1-2hp by switching the coil and another couple of hp by adding in a capacitive ignition control box, but on a turbo/nos car you can expect much more power and a smoother upper band with a upgraded ignition system. When buying a coil get a transitor type unit and not the older canister types (oil filed).
The purpose of the capacitive ignition box is to send any where from 400v-580v(depends on brand) to the secondary coil vs the stock 12v. The system works by using a large capaciter to store energy and when the ignition gets triggered 400+ v get sent to the secondary coil. Finally when using a ignition box with a GTi you must get a Tach adapter (msd makes one). This will run in between the stock + - wires and the ignition box input + - wires. Without this the car will not run. Most installations can be done in 1-2 hours and involve simply mounting the units and connecting the wiring. MSD, Crane, Accel, Mallory & Jacobs are a few of the manufacturers who make aftermarket ignition components.
Below we have a actual GTi dyno chart that shows various aftermarket brand coils vs the stock GTi coil. As you can see 1-2hp is achieved over stock with a secondary coil swap.
[ECM Codes]- [1.3->1.6 Swap]- [Turbocharging]- [Handling]- [Brakes]- [Wheels]- [Ignition]- [APEXi SAFC]- [Sohc->Dohc]- [Headers] -[Pulley]