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Today at Atelier Kaz - Private NSX Enthusiast, ex-Honda R&D engineer with F1, Indy/CART background

Cooling Sys, Health Check, etc 03

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During the Health Check, the horn sounded very weak.
The owner told me the same.

On inspection, one side was completely dead with the other one just about surviving.
After exchanging several messages, the owner bought aftermarket one and sent it to me.

Almost all electromagnetic type horn will have max temperature spec around 60 - 65degC.

With this one, it states not to install in the area reaching above 60degC so best not to install under the bonnet behind the radiator.

There are several 'easy to access' area under the bonnet for the installation if the temperature spec was much higher.
Still, on the bench, the measured current was well within the OEM spec so can be installed without modifying the wire gauge size and the OEM circuit already has the relay in place.

If you prefer the sound of air horn and don't mind creating different wiring/relay circuit, then Stebel Nautilus Compact is a good option and some owners in US are using it.
Also it's popular among the MX-5 owners.

It has max temperature spec of 80degC so bit more flexibility in installation position.
However, the current consumption is huge.
Up to 18A at 12V so you must create your own circuit separated from the OEM horn system.

On Prime, some owners claim that the 3rd horn on our NSX (security horn) would be triggered when the horn button on the steering wheel was activated.
If so, it can be used as the trigger switch for the relay.

However, that is not the case on JDM and I believe it would be the same (3rd horn won't be triggered when horn sw pressed) on European models so you need to create something for the trigger.

Back to the installation.

On the bench, tested both horns and they are super-loud.
Many countries have sound level regulation within the MOT and may require certification marking so please check the suitability.

Decided to install at the OEM horn location but found out that the bracket on the aftermarket horn is just a bit too short.

Don't touch the nut holding the bracket to the horn body and also the nearby screw.
They are part of the sound tuning and electromagnet structure that turning them will destroy the horn.

As the OEM ones are dead, decided to use the bracket from them.
Drilled a hole, dash of rust proof two coatings and managed to extend the length of the bracket.

Updated 29-09-2020 at 10:49 AM by Kaz-kzukNA1 (Extra photo, format change)

Tags: horn Add / Edit Tags
Health Check Service , Electronics