Not permitted, not listed in the rules 1 class
On a closed list an unlisted modification is not permitted. · A.2.2, J.1
IHRA · Ignition
ECU reflash or reprogramming, IHRA
IHRA answers this part for 24 of its classes. 9 of those answers permit the part outright and 11 permit it with stated conditions, leaving 4 that do not. 2 of the ones that do not are classes we read as open rather than as refusing it. 4 are inferred from how the class is written rather than quoted from a rule naming this part.
This page is IHRA only, and the bodies do not agree. The same part under IJSBA and UIM. Which one applies to you is decided by whoever sanctions the race you enter.
Where it stands, class by class
24 classes, grouped where the same rule gives the same answer rather than listed one by one, because an answer that holds for a class usually holds for every class that borrows its rules.
What each answer below means
- 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.
- No rule, this is an open class
- Probably keep it. The class carries no stock clause at all, so anything unlisted appears to be open. The rulebook does not say so in terms, and this is our reading rather than a permission anybody wrote down.
Not permitted, not listed in the rules 1 class
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
Legal, with conditions 2 classes
Reprogramming the original unit is the permitted route, with no additional input, output or sensor.
- Runabout GP2 · Y.4.1
- Runabout GP3 · Z.6.1
Legal, with conditions 2 classes
Reprogramming the original unit is the permitted route, on its original connections, with no input, output or sensor added.
- Ski 1100 Modified · R.4.1
- Ski 1500 Modified · Q.4.1
Legal, with conditions 1 class
Reprogramming the original unit is the permitted route, and sensors for air fuel ratio, exhaust gas temperature and detonation may be added for data logging only. · W.4.1
Legal, with conditions 1 class
Reprogramming the original unit is the permitted route, on its original connectors, with no sensor added. · AA.4.1
Legal, with conditions 1 class
Reprogramming the original unit is the permitted route, keeping the same input and output count, with no sensor added. · N.4.1
Legal, with conditions 1 class
Reprogramming the original unit is the permitted route, on its own inputs, outputs and connectors, with no sensor added. · L.4.1
Legal, with conditions 1 class
No additional inputs, outputs or sensors, and original factory connections. · M.5
Legal, with conditions 1 class
Model-dependent. Reprogramming is open on a four-stroke entry only within the stock unit's input and output count, with no sensor added (P.1, N.4.1). A two-stroke entry may modify its unit under O.4.1 so long as no sensor is added. · N.4.1, O.4.1
Legal, with conditions 1 class
On four-stroke entries reprogramming the original unit is the permitted route, with no additional input or output. · BB.7.1
Legal 4 classes
An aftermarket ECU is permitted with no limit stated, which this site reads as covering a reflash, as DD.1 and DD.2 say in terms.
- Drag, Yamaha Spec · DD.3
- Drag, Sea-Doo Spec · DD.4
- Drag, Super Stock · DD.5
- Drag, Stand Up Unlimited · DD.10
Legal 3 classes
The ECU may be reprogrammed, modified or replaced with an aftermarket unit, with no limit on inputs, outputs or sensors stated.
- Ski GP · K.6.1
- Sport GP · V.7.1
- Runabout GP · X.5.1
Legal 2 classes
Reflash or standalone.
- Drag, Yamaha Pro Stock · DD.1
- Drag, Sea-Doo Pro Stock · DD.2
No rule, this is an open class 1 class
No restriction in section CC, and CC.1 permits any modification it does not restrict.
- Freestyle · CC
No rule, this is an open class 1 class
The class states only what it bans and calls itself run what you brung, against a section DD preamble that says anything unlisted is illegal.
- Drag, Unlimited · DD.6
ECU reflash or reprogramming: if the rule your class applies reads differently to you, or the rulebook has changed since this was read, ask. We answer with the section we read it from, or that we have not read it. Ask a rules question.
Every IHRA class · where the rulebooks differ · checks on parts the shop sells · how this site reads a rulebook.
Ignition · four stroke · legal in 20 of 24 answered, 11 with conditions