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Boots for Nippon Denso Plugs

Practical Motorsport Wiring - Club Level

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Do I have any option for booting for these Nippon Denso plugs? Terminating the DR25 prior to the connector just looks half-assed and lazy. Only booting "solution" I found is this:


I had something similar for my bosch fuel injectors, but the boots committed suicide by themselves after a year and were completely cracked/falling apart so i'm a bit reticent to try them. Does anyone have a suggestion for any booting for denso connectors to prevent water/FOD ingress into the sheathing? Its for a rally car, so both of those things will plague me. At the moment, my only path forward are these boots or just going with shrink tubing and some sort of epoxy/glue to seal the ends of my tubing. ANy help would be appreciated.

G'dat Trey. Can you throw up a picture of the connectors in question? Nippon-Denso covers a pretty broad range.

I'd certainly agree with your assessment of the boots you've pictured, I've had similar experiences.

Basically this type of connector. Very little variation. The majority of my plugs (AVCS, injectors, solenoids, etc etc) are this type.

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Those are sumitomo plugs. But they are often called denso because the injectors they connect to are often denso.

Thanks for the clarification. Same question applies. Is there a booting solution for plugs like this? my main concern is water, oil, mud, wicking up the dr25. My only solution at the moment is to inject some silicone/glue up in the seam.

I have not seen boots specific for these connectors. The rear of the connector is not designed for recieving a boot either. There is no lipped bulge on them like other connectors that do specifically take boots. (Eg : Bosch EV1 / Junior Power Timer.) So I dont think you are gonna have much luck booting the connector or harness in a way that is 100% impervious to water/dirt ingress.

I have seen often with extreme enviroment wiring, when you try and seal it up to be 100% sealed from the outside, what usually happens is that you fail, and then what ever you are trying to protect against will make its way in, and then all your sealing efforts will actually work to seal the whatever your trying to keep out, IN.

In the past I have seen and used some orange universal rubber boots over various connectors, switchs and sensors in industrial wiring applications. Basically a rubber/silicone like material cone shape sleeve that is then cable tied over the switch/sensor at the large end, and cable tied over the wiring on the small end. The cable ties clamp them down tight so that they conform to whtever you are trying to boot, and are just cut off and re-tied if access is needed later. I dont know what they are technically called or any part numbers off hand. But have gotten them from electrical trade suppliers like L&H / Auslec for example.

I have found that the most effective way of protecting of wiring from harsh enviroment, is to use denso tape. It is a greasy/waxy fabric like tape that is wrapped and then hand formed down over the item in question and provides excellent protection. But it is horrible to apply and work with and something I will avoid, unless the application really calls for it.

Also putting electrical grease into the connectors will help protect them. The grease just displaces any space for foriegn filth to make its way in. And adds a protective layer to the internal terminals etc.

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