Not legal2 parts
Superchargers are banned outright in this turbo class, so no supercharger or supercharger part may be fitted. DD.7
- Aftermarket supercharger · Forced induction
- Supercharger internals, clutch and pulleys · Forced induction
IHRA · drag
Drag, Turbo No Nitrous
IHRA 2026, DD.7. A closed-list class. The craft must stay stock except where the rules allow otherwise, so anything unlisted is not permitted.
Read out of the published IHRA rulebook on 2026-09-11, so confirm anything that decides a purchase. The full note is at the foot of the page.
Running the class
- Eligible craft
- Not stated. The class is defined by what it permits on the engine rather than by a craft or a manufacturer.
- Displacement limit
- None. The control is the turbocharger inducer diameter and the injector count.
- Licence or tier
- Not stated.
- Minimum weight
- Not stated.
Read from the same class section as the part answers. The rider side of the sport, tiers, ages, licences and what gets inspected, is set out across the bodies at Racing.
Places where the rulebook contradicts itself, or where a figure could not be settled. Nothing in this list is decided, and it sits here rather than in a footnote because it is what you would want before spending money.
- The DD closed-list preamble is most visible here. DD.7 permits only by limit, a turbocharger to a 68mm inducer, watercooled, and no more than four injectors, while the preamble says anything unlisted is illegal. The matrix reads DD.7 as presupposing what a turbo cannot run without and what DD.7's own words regulate, a watercooled header, the turbo's pipes and its oil and water feeds, and up to four injectors. That is a reading the rulebook does not state. An intercooler, boost sensor, ECU change, intake manifold and air intake stay closed, and nothing says how a fourth injector on a three-cylinder engine is driven without an ECU change.
- The 68mm inducer limit is stated without a measurement method.
Confirmed absent by a targeted read rather than merely unnoticed. In a closed-list class an absent article is why a part reads as not permitted; in an open class it is why one reads as open.
- No class criteria.
- No engine, fuel composition, ignition, pump or hull article beyond the five bullets.
What the rules say (81 parts)
8 permitted outright, 18 permitted with stated conditions, 5 refused by a rule we can quote and 50 refused by our reading of the class rather than by a quoted rule. Grouped where the same rule gives the same answer, so two "Not legal" groups can sit side by side under different rules.
What each answer below means
- Not legal
- This comes off. The rules refuse it in this class.
- Not permitted, not listed in the rules
- Treat it as coming off. The class requires the craft to stay stock except where the rules allow otherwise, and this part is not on the list, so this is our reading rather than a rule we can quote at you.
- Legal, with conditions
- Keep it, but measure it: the rules permit this part only inside stated limits.
- Legal
- Keep it. The rules permit this part in this class.
Read the refusals as a list of work. Anything below marked Not legal, OEM part required, or Not permitted has to come off the machine, or go back to the standard part, before it races in this class.
Not legal1 part
Bolts, nuts and washers may not be substituted with titanium unless originally equipped. Locking mechanisms are allowed. J.7
- Titanium fasteners · Engine
Not legal1 part
No nitrous, no spraying. DD.7
- Nitrous oxide system · Forced induction
Not legal1 part
DD.7 bans lightened and gutted hulls, and no other hull work is listed for the class. DD.7, DD
- Modification of the OEM hull · Hull and handling
Not permitted, not listed in the rules31 parts
On a closed list an unlisted modification is not permitted. A.2.2, J.1
- Aftermarket or modified waterbox · Exhaust
- Relocated or aftermarket through-hull outlet · Exhaust
- Exhaust restrictor plate removal · Exhaust
- Aftermarket flame arrester · Fuel
- Airflow sensor modification or removal · Fuel
- Aftermarket throttle body · Fuel
- Aftermarket electric fuel pump · Fuel
- Aftermarket or substituted fuel tank · Fuel
- Aftermarket or lightened flywheel · Ignition
- Aftermarket pistons · Engine
- Aftermarket or modified crankshaft assembly · Engine
- Aftermarket connecting rods · Engine
- Cylinder head work (4-stroke) · Engine
- Engine block substitution · Engine
- Aftermarket camshafts · Engine
- Aftermarket valves · Engine
- Aftermarket valve springs and retainers · Engine
- Aftermarket or thicker head gasket · Engine
- Aftermarket pump housing and stator vanes · Driveline
- Aftermarket or bored pump nozzle · Driveline
- Aftermarket driveshaft and couplers · Driveline
- Titanium driveshaft · Driveline
- Adjustable or rider-controlled trim tabs · Driveline
- Aftermarket or modified top deck · Hull and handling
- Aftermarket hood · Hull and handling
- Aftermarket bulkhead · Hull and handling
- Flotation foam removal · Hull and handling
- Ventilation tubes and vent sealing · Hull and handling
- Aftermarket seat · Hull and handling
- Aftermarket seat cover · Hull and handling
- Hull extension · Hull and handling
Not permitted, not listed in the rules12 parts
DD.7 states no engine type, so a two-stroke entry cannot be ruled out, and DD.7 does not list this part, so under the DD preamble it is not legal on either engine. DD.7
- Aftermarket expansion chamber / tuned pipe (2-stroke) · Exhaust
- Water-injected (wet) exhaust pipe · Exhaust
- Stinger diameter reducing insert · Exhaust
- Aftermarket carburetor · Fuel
- Carburetor jets, needle valves and springs · Fuel
- Aftermarket reed valve assembly · Fuel
- Aftermarket or modified rotary valve · Fuel
- Aftermarket CDI ignition (2-stroke) · Ignition
- Ignition timing adjustment or trigger plate · Ignition
- Aftermarket or swapped cylinder (2-stroke) · Engine
- Aftermarket cylinder head (2-stroke) · Engine
- Base gasket thickness change · Engine
Not permitted, not listed in the rules1 part
A turbo feeds the engine through its existing intake manifold, so reading DD.7 as admitting the turbo's own installation does not open an aftermarket manifold, and DD.7 does not list one. DD.7
- Aftermarket intake manifold · Fuel
Not permitted, not listed in the rules1 part
The pipes joining the turbo to the existing intake travel with the turbo under the reading of what DD.7 presupposes. An aftermarket air intake or cold air system beyond them is not in DD.7, and the DD preamble says what is not listed is not legal. DD.7
Not permitted, not listed in the rules1 part
DD.7 does not name the ECU and a turbo does not need a reflash to run, so the reading that admits the turbo's own installation does not open reprogramming. DD.1 to DD.5 each name the ECU in terms, and DD.7 does not. DD.7
- ECU reflash or reprogramming · Ignition
Not permitted, not listed in the rules1 part
DD.7 does not name the ECU and a turbo runs on the original unit, so the reading that admits the turbo's own installation does not open an aftermarket or standalone box. Every stock-based drag class from DD.1 to DD.5 opens the ECU in words that DD.7 lacks. DD.7
- Aftermarket or standalone ECU · Ignition
Not permitted, not listed in the rules1 part
DD.7 names no boost sensor and a turbo runs on the original one, so the reading that admits the turbo's own installation leaves an aftermarket sensor closed under the DD preamble. IHRA opens boost sensors in their own clause where it means to (K.5.3, X.4.3). DD.7
- Aftermarket boost sensor · Ignition
Not permitted, not listed in the rules1 part
DD.7 limits the turbo to a 68mm inducer and names no intercooler, and a turbo runs without one, so reading DD.7 as presupposing the turbo's installation does not open it. Where IHRA allows an intercooler beside a turbo it gives it a clause of its own (K.5.2, X.4.2), and the DD preamble keeps anything unlisted illegal. DD.7
- Aftermarket intercooler · Forced induction
Not permitted, not listed in the rules1 part
DD.7 lists no replacement hull, and the section DD preamble says "If it is not listed here then it will not be legal". DD.7
- Aftermarket hull · Hull and handling
Legal, with conditions1 part
DD.7 allows a turbo and regulates its header in its own words ("Watercooled Only, No Hot Headers"), and a turbo cannot run without a manifold to feed it, so this cell reads DD.7 as presupposing a watercooled header or exhaust manifold for the turbo and the pipe returning its exhaust to the existing water box. That is a reading of what DD.7 presupposes, not a listed permission, and a dry or uncooled header stays banned. DD.7
Legal, with conditions1 part
DD.7 caps the craft at four injectors ("4Injectors Max"), and this cell reads that cap as presupposing aftermarket or added injectors up to that count. DD.7 sets no other injector limit. DD.7
- Aftermarket fuel injectors · Fuel
Legal, with conditions1 part
J.7, in the general rules for every class, names wiring as replaceable with aftermarket options, which overrides the closed-list default and covers replacement wiring. Connectors are not named on their own, and J.7 does not open added inputs or outputs, a different harness design or an ECU. J.7
- Aftermarket wiring harness or connectors · Electrical
Legal, with conditions1 part
Must fit the original battery box and be securely fastened. J.9
- Aftermarket or relocated battery · Electrical
Legal, with conditions1 part
Repairs are allowed for a crack or puncture, but only one damaged area affecting one cylinder bank. No other modification. J.11
Legal, with conditions1 part
Watercooled only. No hot headers. Limits: max inducer 68 mm. Read as what DD.7 presupposes, the turbo brings the pipes joining it to the existing intake and its own oil and water feeds, since it cannot run without them. DD.7
- Aftermarket turbocharger · Forced induction
Legal, with conditions1 part
May be modified or replaced with an aftermarket part. The original diameter must be maintained in Stock class, and the rulebook never defines which classes that is. J.18.2
- Aftermarket impeller · Driveline
Legal, with conditions1 part
May be replaced within OEM specifications. J.18.3
- Replacement wear ring · Driveline
Legal, with conditions1 part
Aftermarket or modified, full-length type with at least one bar parallel to the driveshaft, dropping no more than 12.00mm (0.47 in) below the flat plane of the pump intake. J.18.1
- Aftermarket intake grate · Driveline
Legal, with conditions1 part
Aftermarket or modified. An extension may not exceed the width of the original plate, and on a ski may not extend more than 100 mm (3.94 in). J.18.1
- Aftermarket ride plate · Driveline
Legal, with conditions1 part
Replacement trim plates may be used provided they mimic the handling characteristics of the stock plates. J.18.2
- Replacement trim plates · Driveline
Legal, with conditions1 part
Braking devices may be disabled for safety, and reverse buckets and trim motors may be removed or modified to disable them, provided no hazard is created. J.18.4
- Reverse bucket or brake removal · Driveline
Legal, with conditions1 part
Aftermarket, modified, repositioned or removed. Up to two, each no longer than 36 in (91.45 cm), protruding no more than 3.94 in (100 mm) horizontally, at least 6 mm thick with radiused leading edges, and not attached to a planing surface. J.16
- Aftermarket sponsons · Hull and handling
Legal, with conditions1 part
Mat kits and padding are allowed in every class by the general rules (J.14), which overrides the closed-list default. Footholds and foot straps are not named there, so they stay not permitted. J.14
- Footholds, foot straps and tray mats · Hull and handling
Legal, with conditions1 part
DD.7 states no craft type, so on any handle pole craft raced here the pole assembly and mounting brackets may be modified or replaced if they keep their original function; length may be altered and the attaching point reinforced. J.17.2
- Aftermarket handle pole · Hull and handling
Legal, with conditions1 part
Replacement bumpers and side rails may be used provided they create no hazard. A permanently affixed nose bumper remains required. J.13, I.17
- Replacement bumpers and side rails · Hull and handling
Legal, with conditions1 part
May be added to adjust handling. Constant mass only, and no other part may be modified to carry it. J.19
- Ballast weight · Hull and handling
Legal, with conditions1 part
Under the general maintenance allowance a cooling hose or clamp may be aftermarket (J.7). Read as what DD.7's "Watercooled Only" presupposes, the water lines and fittings that cool the turbo and its header are admitted as well, and no other added cooling fitting is listed. J.7, DD.7
- Aftermarket cooling lines and fittings · Cooling
Legal1 part
J.7, in the general rules for every class, names hoses and clamps as replaceable with aftermarket options, which overrides the closed-list default and covers an aftermarket fuel hose. Fittings are not named on their own. J.7
Legal1 part
Any gauges are allowed anywhere on the PWC. DD
- Aftermarket gauges and data logging · Electrical
Legal1 part
Named in the general maintenance allowance along with wiring, hoses and clamps. J.7
- Spark plugs, wiring, hoses and clamps · Electrical
Legal1 part
May be replaced. J.8
- Replacement starter motor · Electrical
Legal1 part
May be replaced, as may starters and oil injection systems, with the oil injection system removable or disconnectable. J.8
- Replacement engine mounts · Engine
Legal1 part
Grips, throttle and cables may be modified or aftermarket. The bar must be padded at the mounting bracket or the crossbar padded. J.17.1
- Handlebars, grips and controls · Hull and handling
Legal1 part
Steering shaft, holder, handlebar holder and cables may be aftermarket, and quick-turn modifications are allowed. J.17.2
- Steering shaft, holder and cables · Hull and handling
Legal1 part
The bilge pump may be modified or disconnected and aftermarket bilge draining systems are permitted, provided they create no hazard. J.10
- Aftermarket bilge draining system · Cooling
IHRA 2026, DD.7, read from the rulebook on 2026-09-11. Read the rule yourself, Drag, Turbo No Nitrous. Every IHRA class · where the rulebooks differ · how this site reads a rulebook.
This is one class. Every part below also has a page of its own showing where it stands across every class this body runs, and legality by part is the index of them.
- Aftermarket handle pole. Corrected 2026-10-07: the Drag Turbo No Nitrous row called the part not applicable to a seated class; the class states no craft type, and the drag rules admit only what they list.
Cite this page
“Drag, Turbo No Nitrous, IHRA class rules”, BaddJet archive, https://baddjetarchive.com/legality/ihra/drag-turbo-no-nitrous/
Add the date you read it.
81 parts read · 8 permitted, 18 with conditions · 2026 rulebook