Ignition Coil FAQ

Granatelli Motor Sports, a performance parts manufacturer in Oxnard, California. We sell performance ignition coils for GM, Ford, Dodge, Chrysler, Jeep, Mazda, Nissan and McLaren engines, and we support them directly by phone at 1-805-486-6644.

Yes. We make coils for GM LS and LT V8s, the Ford 5.0L Coyote, Ford 4.6L and 5.4L 2-valve, 3-valve and 4-valve Modular V8s, the Ford 6.8L V10, Ford EcoBoost engines, the Dodge HEMI and several other engines. See the Granatelli Motor Sports ignition coil packs.

The main series, from mildest to strongest, are Street Fighter for street performance upgrades, Hot Street for stock, tuned, naturally aspirated and mild-boost street builds, Pro Series for serious performance builds, and Pro Series Xtreme for high-compression, nitrous, supercharged and turbocharged builds. For GM LS and LT engines we also make the 85kV Malevolent series. Other lines include the 35kV MPG coils for Ford Modular engines and V10s, the Direct Ignition sets for Ford 4.6L/5.4L, the IGN1A Smart Coil for aftermarket ECUs, and the Xtream coils for the Nissan GT-R and McLaren.

Output and intended use. On a GM LS engine, the Street Fighter set (28-0512-CP) is rated at 60kV and is listed for stock, street-performance and mildly modified engines. The Pro Series Extreme set (28-0513-CP) is rated at 80kV, and the Malevolent set (28-0513-CPM) at 85kV for naturally aspirated, supercharged, turbocharged and nitrous engines. Match the part number to your engine and build rather than choosing by series name alone. Our guide walks through it: Which Granatelli Coil Pack Do I Need?

Malevolent is our highest-output coil series for GM engines, rated at 85kV. It comes for GM LS engines (28-0513 numbers) and Gen V LT1/LT4 engines (28-0514 numbers) in black, blue or red, as a complete set of eight or as single coils. The product pages list them for stock, naturally aspirated, supercharged, turbocharged and nitrous engines, and the Malevolent sets are listed as made in the USA.

MPG coils are 35kV coil kits for Ford 4.6L/5.4L Modular V8s and sets of 10 for the Ford 6.8L V10. The MPG Plus 4-valve kit pairs the coils with Granatelli stainless-steel coil connectors and is aimed at stock, tuned and mildly modified street engines.

A 52kV coil with a built-in smart ignitor, so it needs no external ignition module. It works with most aftermarket ECUs that use 5V logic-level trigger signals, in custom coil-on-plug or coil-near-plug setups. It is sold as a set of eight or as a single coil.

Many are. The product pages for the GM LS and LT Malevolent sets, the blue and red LT1/LT4 Pro Series Extreme sets, the LS Street Fighter coils, many Ford 4.6L/5.4L kits and the 28-1818SC Coyote kit state that they are made in the USA. Check the product page for the part number you are buying.

Granatelli Pro Series Xtreme and Street Fighter Coyote coils use a zero-ohm design to move as much of the coil's energy as possible to the spark plug, with RFI and EMI suppression to keep interference away from the vehicle electronics. Read Ford 4.6L and 5.4L 3V Ignition Coils: Why Granatelli 65K Coils Matter.

Granatelli ignition coils carry a 1-year limited warranty, and extended coverage is available at checkout. For a claim, contact us with proof of purchase and the part number.

Orders placed before 3:30 PM Pacific ship the same business day, and website orders over $100 ship free.

For a stock or daily-driven engine, Street Fighter and Hot Street are the usual choices. On the Coyote, Street Fighter is aimed at daily-driven, naturally aspirated and lightly modified cars and trucks, and Hot Street covers stock, tuned and mild-boost street builds. Not every stock engine needs a 65kV coil, but the higher-output series also fit stock engines when the part number is listed for your vehicle. Read Granatelli Street Fighter Coyote Coils.

A tuned or cammed naturally aspirated engine usually fits Hot Street or Pro Series. Step up to Pro Series Xtreme, or Malevolent on GM LS and LT engines, for high compression or high RPM, or when you plan to add a supercharger, turbo or nitrous later.

Pro Series Xtreme is the series built for high-compression, nitrous, supercharged and turbocharged builds, and on GM LS and LT engines the 85kV Malevolent is listed for the same uses. Boost raises cylinder pressure, which makes the spark harder to fire. Also check your spark plug type and gap for your boost level. Read Why 65,000-Volt Granatelli Coils Matter.

No. The kV rating is the coil's maximum available voltage, not a power number. The plug does not use the full rating on every firing. The extra voltage gives the ignition headroom when boost, compression or RPM make the spark harder to fire. A higher-output coil helps most when the existing ignition is the limit.

No. Headline voltage alone does not establish spark energy under all operating conditions. Compatibility, charging time, plug gap and cylinder pressure also matter.

Output differs by engine, even within the same series. For example, Street Fighter coils are rated at 25kV for the Ford 4.6L/5.4L, 42kV for the Coyote and 60kV for the GM LS, and Pro Series Xtreme is 65kV on Ford engines and 80kV on GM LS and LT engines. Each coil is listed with its own rating, so compare the kV in the product title.

Yes, for the Ford 5.0L Coyote (01818 and 01819 numbers, from $53.89), GM LS (28-0512-1 and 28-0513-1 numbers), GM LT1/LT4 (28-0514-1 numbers) and the IGN1A Smart Coil. A single coil is for replacing one weak, damaged or failed coil. Order one per cylinder you are replacing; a V8 uses eight.

For a performance upgrade, yes. A matched set gives every cylinder the same ignition output, and Granatelli specifies that its high-output Pro Series Xtreme coils be used as a complete set rather than mixed with lower-output coils. A single coil of the same series is fine for replacing one failed coil in a matched set.

It depends on the engine. GM LS and LT coil sets do not include wires, so you can keep good wires or upgrade them. Our 28-1680KIT, 28-5362KIT and 28-1818SC-R kits pair the coils with Granatelli 0-ohm wire. In LSX Magazine's C700 test the gain came from coils and 0-ohm coil-near-plug wires together. See the Ignition Wire FAQ.

No. Granatelli coils for factory ignition systems are listed as direct replacements that need no external ignition box or amplifier. The IGN1A Smart Coil has its own built-in ignitor for aftermarket ECUs.

They can when the ignition is limiting the engine. In LSX Magazine's Project C700 test, a ProCharged LT1 Corvette gained 19.26 rwhp and 18.73 lb-ft after switching to Granatelli coils and 0-ohm coil-near-plug wires, with nothing else changed. On the Dodge HEMI, Granatelli Motor Sports has seen gains of up to 10 hp on naturally aspirated engines and up to 18 hp on turbocharged or supercharged engines. Results depend on your engine, tune, plugs and the condition of the coils you are replacing.

Not necessarily. Results depend on whether the existing ignition system limits spark performance and on the engine's tune and modifications.

On the GM LS and LT Street Fighter, Pro Series Extreme and Malevolent product pages, Granatelli reports average gains of 6 to 8 horsepower on stock engines, up to 12 horsepower over factory coils, and up to 18 horsepower on heavily modified or forced-induction engines with a matched set. Actual results vary with the vehicle, engine combination, tune and condition of the existing ignition.

Granatelli Motor Sports tested its Hot Street coil-on-plug coils on a 2011 Mustang GT 5.0L with a stock tune and a Granatelli axle-back exhaust. Swapping the factory coils gave a peak gain of 13 hp and 15 lb-ft, and an average gain of 16 hp and 18 lb-ft from 2,000 to 6,800 rpm. Read Ford 5.0L Ignition Coil Dyno Testing Explained.

For the 28-1697SC kit, Granatelli reports gains of up to about 12 horsepower on naturally aspirated engines and up to 25 horsepower on supercharged, turbocharged and nitrous engines. Gains depend on the engine and the condition of the existing ignition. Read Do Ignition Coils Add Horsepower? Granatelli Ford 4.6L and 5.4L 2V Coil Dyno Results.

Yes. LSX Magazine tested the 85kV Malevolent coils on a 2016 Cadillac CTS-V. Read the article: Shocking Revelations With Granatelli's Malevolent Coils.

Use the same vehicle, fuel, plugs, tune and test conditions, then perform repeatable baseline and follow-up runs. Treat results as specific to that test configuration rather than guaranteed gains. See an example: Ford 5.0L Ignition Coil Dyno Testing Explained.

Coyote kits are split by model year: 28-1815 numbers for 2011–2015, 28-1816 for 2016–2017 (the 28-1816SF also lists the 5.2L) and 28-1818 for the 2018–2026 Mustang GT 5.0L and 2018–2021 F-150 5.0L. Each comes as Street Fighter (42kV), Hot Street (50kV), Pro Series (60kV) or Pro Series Xtreme (65kV). Shop Ford coil packs.

No universal interchangeability should be assumed. Check engine generation, model year, connector, boot and the exact Granatelli application list.

The 01818 singles are coil-on-plug and the 01819 singles are coil-near-plug. Both are for the 2018–2026 Mustang GT 5.0L and the 2018–2021 F-150 5.0L. Compare your factory coil with the product photos to choose the right style.

For the square-style LS coil, choose the 60kV Street Fighter (28-0512), 80kV Pro Series Extreme (28-0513) or 85kV Malevolent (28-0513 numbers ending in M), listed for engines such as the LS2, LS3, LS7, LS9, LSA, L92, L99 and L76. Some GM trucks, SUVs and Denali models use a round coil with a different connector. For 1997–2012 4.8L and 5.3L trucks with cylindrical coils, use 28-1680CP or 28-1680KIT.

No. The LS coil sets are not intended for Gen V LT engines. For 2014–2024 LT1 and LT4 engines use the 28-0514 numbers, which are not for the 1990s Gen II LT1/LT4 and should not be assumed to fit the LT2, LT5, L86, L87 or newer Cadillac LT4. For the GM L83 5.3L and L86 6.2L, see 28-5362KIT.

Yes. Granatelli HEMI coils fit all HEMI sizes: 5.7L, 6.1L, 6.2L supercharged Hellcat and 6.4L. Choose the 28-0504-CP 65kV coil kit or the Granatelli 2005+ Dodge HEMI 5.7L/6.1L/6.2L Hellcat/6.4L 80kV Xtreme Coil Kit (28-0504-XCP). Granatelli Motor Sports has seen gains of up to 10 hp on naturally aspirated HEMI engines and up to 18 hp on turbocharged or supercharged HEMI engines. Results vary with the engine and tune.

Confirm the model year, engine code and original coil connector, then match the listed Granatelli part number. 2-valve kits include 21-2001-SF (25kV), 25-2001 (42kV Hot Street), 28-1697CP (60kV) and 28-1697SC (65kV), plus the 28-1519 DIS coil packs. A 2-valve and a 3-valve engine may require different coils.

Do not assume interchangeability. Coil mounting, boots, connectors and ignition requirements can differ; use the application-specific part number.

Ford did not use the same coil connector on every 3-valve engine, so Granatelli offers more than one 3V kit, including the 65kV 28-1812SC and 28-1814SC and the 42kV 25-3001 Hot Street set. Verify the year, vehicle, engine and connector before ordering.

Yes, as complete sets of 10: 35kV MPG, 42kV Hot Street (25-3001-10), 60kV Pro Series and 65kV Pro Series Xtreme. 2-valve V10s use the 20-1701 kits and 2005–2017 6.8L V10s use the 20-1813 kits.

Yes. For the 2.0L/2.3L EcoBoost there is the 42kV 24-0230HS and 65kV 24-0230SC. For the 2014–2016.5 3.5L EcoBoost there are 45kV, 60kV and 65kV kits (26-0646HS, CP and SC). The 3.5L kits do not fit 2017 and newer engines, and 2016 owners should check the build date and original coil style.

Current coils include the 2011–2014 Ford 3.5L and 3.7L non-EcoBoost V6, 2005–2010 Ford 4.0L V6, GM 3.6L V6, 2007–2011 Jeep Wrangler 3.8L, 1990–1993 Mazda Miata, Dodge and Chrysler 2.0L/2.4L, Nissan GT-R R35 and McLaren 650/670/720/765. Search by part number or vehicle, or call 1-805-486-6644.

Compare the number, shape and keying of the vehicle connector with the exact product photos and fitment notes. Do not force a connector that does not fit.

Provide year, make, model, engine, current coil part number and photos of the connector and mounting location. Note engine swaps and any aftermarket ignition controller.

Follow the vehicle's service procedure and ignition-system safety guidance. Work with the ignition switched off and never handle energized high-voltage components.

Follow the coil and vehicle manufacturer's installation instructions for any grease and its location. Do not put grease on electrical contact surfaces unless specified.

No. Use the vehicle or product-specific fastener specification; overtightening can damage mounting bosses while undertightening can allow movement.

A connector that is not fully latched may intermittently disconnect as the engine vibrates. With ignition off, verify the connector is undamaged and locked in place.

Yes. A boot or spring that does not reach the spark plug correctly can cause a poor connection. Match the complete coil assembly to the exact application.

Inspect the plugs for wear, deposits, damage and correct gap; replace them if needed. A faulty plug can cause misfires even with new coils.

In most applications, yes. Spark plug type and gap should still be appropriate for your engine combination and power level.

Installing Granatelli coils by themselves does not normally require a tune, because they work through the factory ignition system. A supercharged, turbocharged, nitrous or otherwise heavily modified engine should always have a calibration that suits the complete combination.

Spark blowout is when the ignition cannot reliably fire the plug under high cylinder pressure. The engine runs fine at idle and light throttle, then misfires, breaks up or loses power under boost or at high RPM. The same symptoms can come from plugs, fuel delivery, wiring or tuning, so diagnose before replacing coils. Read Spark Blowout or Something Else?

No. Plug gap, fueling, wiring, compression, boost control and calibration can also cause misfires under load. Diagnose the actual cause before selecting an upgrade.

Yes. Increased cylinder pressure can make spark delivery more demanding, so plug type and gap should match the engine and tune.

Verify battery voltage, coil power and ground, fully latched connectors and correct part numbers. Read diagnostic codes and follow the vehicle service manual before replacing more components.

Possible causes include damaged wiring, a shorted connector or an incompatible installation. Stop replacing fuses repeatedly and have the circuit diagnosed using the correct wiring diagram.

A qualified technician can compare cylinder-specific misfire data and, where the service procedure permits, move a compatible coil to another cylinder. Record the original location and never interchange incompatible coils.

No. Avoid disconnecting energized ignition components. Use appropriate scan-tool diagnostics and the vehicle service procedure instead.

No. Compression loss, fuel delivery problems and other mechanical faults need their own diagnosis, and a coil upgrade does not correct air-fuel, fuel-pressure or calibration problems.

Yes. Torn, contaminated or heat-damaged boots may allow spark leakage or poor contact; inspect the boot and plug well during diagnosis.

Provide the engine and coil part numbers, cylinder number, diagnostic codes, plug type and gap, and whether the fault appears at idle or under load.