Tag: Turbo Blanket size chart

You cannot choose a turbo blanket size by car model alone. Turbocharger designs vary enormously, and turbos from the same family often wear different turbine housings. A few careful measurements get you the right fit first time.

This guide covers frame sizes, wastegate types, what to measure and what to send us. Once you have your numbers, match them against our turbo blanket range.

Why measuring matters

• Designs vary. Factory, aftermarket, truck and marine turbos all use different housing shapes.
• Model lists overlap. GT40 and GT55 turbos appear in both our T4 and T6 fitment lists, because housing sizes vary within one turbo family.
• Wastegate type changes the fit. An internal wastegate needs a blanket shaped for it.
• A poor fit costs you. Too small and the blanket will not close around the housing, leaving hot metal exposed. Too big and it sits loose, moves and can foul the wastegate arm or sensors.

Turbo frame sizes explained

The T number is a rough frame size, not a guaranteed dimension. Two turbos with the same T number can wear different turbine housings, so the fit comes from your measurements. Our standard blanket sizes run from T2, the smallest, up to T6, plus a dedicated GT25 to GT28 size. Here are the fitment examples listed on our product pages.

Use these lists as a starting point. A T3 turbo blanket or T4 turbo blanket only fits well if your housing matches the blanket’s dimensions, so always measure.

Internal or external wastegate?

The wastegate lets some exhaust gas bypass the turbine to control boost. Where it sits changes the shape of the blanket you need.

• Internal wastegate (IWG). The valve is built into the turbine housing. You will see a lever on the outside of the housing, linked by a rod to an actuator can.
• External wastegate. A separate wastegate unit is plumbed into the exhaust before the turbo, with its own outlet pipe. The turbine housing has no wastegate lever.

We make turbo blanket internal wastegate versions in T2 and T3 sizes, in both titanium basalt and silicone coated. If you run an internal wastegate on a T4 or larger frame, call us before you order.

The turbo blanket size chart

The size chart on this page labels each dimension with a letter. Measurements A and B are the most important, so get those right first. Work in millimetres and measure each dimension twice.

How to measure your turbo

1. Let the engine cool completely. Turbine housings stay hot long after shutdown.
2. Find the turbine housing. It is the hot side, bolted to the exhaust manifold. Do not measure the compressor housing on the air intake side.
3. Wipe away enough grime to see the housing edges clearly.
4. Measure A and B as shown on the size chart. Use a flexible tape or steel rule and record the figures in millimetres. Measure each one twice.
5. Record the other dimensions on the chart wherever you can reach them.
6. Note your wastegate type, internal or external.
7. Photograph the housing with a tape measure held across it. Take shots from the front, side and top, and include the wastegate lever, the manifold flange and the dump pipe connection.
8. Write down the engine, the vehicle or machine, and the turbo brand and model. The model is often stamped on a tag on the compressor housing.

Tips for tricky installs

• If you cannot reach a dimension with the turbo in place, measure what you can and send clear photos. We can work from photos and dimensions.
• Note anything close to the housing, such as an O2 sensor, oil lines, coolant lines or a factory heat shield.
• Compare your figures with the photos and dimensions on the product page before you add a blanket to your cart.
• If you fall between two sizes, call us before you order.

Vehicle and engine-specific blankets

If your engine is on this list, a dedicated blanket takes most of the guesswork out. Still check your photos against the product page.

• Subaru WRX EJ20 and EJ25 (titanium basalt and carbon fibre)
• VW and Audi K04 (titanium basalt)
• Toyota LandCruiser 1HDT (titanium basalt)
• Mitsubishi Evo X (titanium basalt)
• CAT C13 and C15 (titanium basalt)
• Cummins, including QSM11 and 12 to 19L engines (industrial and marine). Cummins turbos also appear in the silicone coated range
• CAT 6.6, C3056E, C12 and C15 (industrial and marine)
• Scania, including the P410 (silicone coated, industrial and marine)
• Holset HX55i (silicone coated, industrial and marine)
• Universal truck blankets (titanium basalt, silicone coated, industrial and marine)

Truck, marine and plant operators can browse the full list of industrial and marine turbo blankets.

Custom turbo blanket and made-to-order options

We keep standard designs and can modify them or make a custom turbo blanket for larger turbos. Some industrial blankets are made to order. The Cummins QSM11 blanket takes 2 to 3 weeks. For industrial and marine jobs, we can arrange a site visit depending on your location.

To start a custom order:

1. Send your measurements, with A and B clearly marked.
2. Attach photos of the housing with a tape measure in shot.
3. Tell us the engine, turbo model and wastegate type.
4. Call 1300 44 33 34 or email sales@koolwrap.com.au.

Choose your material

Once you know your size, pick the outer layer. Titanium basalt turbo blankets are rated over 1,000°C continuous. Silicone coated turbo blankets resist oil and fuel, which suits oily or dusty engines. Not sure a blanket is worth it for your setup? Read what a turbo blanket does.

Turbo blanket sizing FAQs

How do I know what size turbo blanket I need?

Measure the turbine housing rather than going by your car model. Take dimensions A and B from the size chart on this page, note whether your wastegate is internal or external, and compare those figures against the product page. If you fall between two sizes, call us.

What size is a T3 turbo blanket?

The T number is a rough frame size, not a single fixed dimension, so two T3 turbos can wear different housings. Our T3 blanket is listed for T25, T28, GT25, GT30, GT32 and GT35 housings with an external wastegate, with a separate version for internal wastegate turbos. Measure your housing and check it against the product dimensions.

Do I need an internal wastegate turbo blanket?

You do if the wastegate valve is built into the turbine housing, which you can spot by the lever and actuator rod on the outside of the housing. We make internal wastegate versions in T2 and T3. For an internal wastegate on a T4 or larger, call before you order.

Can I get a custom turbo blanket made?

Yes. Send your measurements with A and B marked, photos of the housing with a tape measure in shot, and the engine, turbo model and wastegate type. We keep standard designs and can modify them or make a blanket for a larger turbo. Some industrial blankets are made to order, and the Cummins QSM11 takes 2 to 3 weeks.

What if my turbo is not on the fitment list?

Measure it and send photos. The fitment lists are examples, not a complete catalogue, and the T4 and T6 lists deliberately overlap because housing sizes vary inside one turbo family. Most turbos we have not listed still match a standard design or a modified one.

Need help with sizing?

When your blanket arrives, follow our guide on how to fit a turbo blanket. Ready to order? Browse all Kool Wrap turbo blankets, or call 1300 44 33 34 with your measurements and photos and we will match you to the right size.