Turbo Exhaust Wheel Containment
- Any turbocharger used in NTPA competition where exhaust exits to atmosphere must have an approved exhaust wheel containment device installed.
- Containment device and any attaching components or hardware must be supplied by a NTPA approved manufacturer.
- Containment device cannot be placed in any part of exhaust pipe. If containment device is attached to turbo exhaust housing flange by use of a clamp, then the exhaust pipe must be welded to the containment device.
- Containment device must be installed as designed by manufacturer. No modifications or alterations of any kind allowed.
- Manufacturer may identify each component or assembly by engraving part numbers or some type of identification into each part.
NTPA Approved Containment Devices
1) Option 1 – Cross Bolts in Turbo Exhaust Housing – installed by turbo manufacturer
- Qty. 2 (two) .500-inch diameter, grade 5 or greater bolts installed by drilling qty. 4 (four) holes into turbo exhaust housing and welded in place.
- Bolts must be installed at 90 degrees from each other and no more than .0625-inch (1/16-inch) between the two bolts.
- Cross bolts must be located as close to the center of exhaust wheel as possible.
2) Option 2: Containment Adapter – supplied by turbo manufacturer
- Containment device supplied by turbo manufacturer must be approved by NTPA Tech Services and installed as supplied by manufacturer.
- Containment device must be located as close to exhaust wheel as possible.
- Containment device and components supplied for attachment to turbo housing must contain the manufacturer’s name or logo identification.
3) Option 3: Containment Adapter – supplied by NTPA approved manufacturer
- Exhaust adapter must be fabricated using two interlocking pieces of .250-inch x 1.000-inch flat steel notched .250-inch x .500-inch at center creating a single interlocking assembly and fully welded into a cross pattern.
- Round steel containment adapter must be a minimum .175-inch wall thickness and contain cross assembly fully welded inside the adapter, not in exhaust pipe.
- Leading edge of cross assembly can be sharpened a maximum of .250-inch back from leading edge facing the exhaust wheel. Any tapered or sharpened edge is in addition to 1-inch minimum width.
- Location of leading edge of cross assembly not to exceed .125-inch behind face of adapter flange on turbo side.
- Adapter mounting flange must be a minimum .140-inch wide at base of flange and a minimum .125-inch wide at narrowest point of taper.
- Adapter must be attached to turbo exhaust housing flange using clamp supplied by adapter manufacturer. Since this containment device is attached to turbo exhaust housing flange by use of a clamp, the exhaust pipe must be welded to the containment device. Adapter and attaching clamp must be clearly identified with manufacturer name or logo.
Exhaust Wheel Cage
Note: Exhaust Wheel Cage is a containment device bolted to exhaust housing by turbo manufacturer. Same rule as adopted in 2023.
- Billet steel cage made from 304 stainless bolted and fastened to exhaust housing as supplied by the turbo manufacturer.
- Exhaust wheel cage must be fastened using bolts, a minimum qty. 8 (eight) – 5/16-inch diameter, grade 8 or greater bolts required or wheel cage fastened as designed by turbo manufacturer.
- Turbo exhaust wheel cage must be manufactured by sane turbo manufacturer on which it is installed.
- Exhaust wheel cage must be installed as supplied. No modifications allowed.
- NTPA Technical Services to determine any additional dimension or specifications required.
Anyone intending to install a device like the one pictured in your exhaust pipe or flange, this is not an approved device and will not be accepted as a turbo containment device for NTPA. If you do not use one of the Turbo Manufacturers devices, (APEX DIESEL, APEX TURBO, WIMER, Hart’s etc.) then you must have a device and clamp per the drawing on this Tech Page.