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[tompas11]

I was curious if such a modification would be of some value. So I made my own temperature sensor, based on the information given in the video.
And I have to agree - after installation the engine runs more much better. The idle is more stable and when accelerating from the middle speed range the difference is significant. Before changing the temperature sensor, the engine was not really willing to accelerate and vibrations were increased when turning the throttle. After installing the new sensor, the engine runs much smoother and acceleration is more even. I will not say all engines will behave the same way as my engine is a little bit a “special one” (of a doubtful quality from factory), but for me the new temperature sensor is a big improvement and I can recommend it.

Very nice. I'm glad that you got good result with your home made booster plug. I'm very pleased with mine and it's still working lika a charm.

[windmill john]

Harald, purely a tentative question. Would you be willing to make me one? Paid of course. Or maybe an exact component list?



John

[tompas11]

There are only 2 components and they are connected in parallel.
1. NTC Thermistor 10 k ohm
1. Resistor 5,6 k ohm 1/4W 5%

[windmill john]

Thanks tompass11, I think the black mist of doom covers my eyes when we start talking electrics. Not all electrics, just component level!
Looking at the actual replacement unit, yours and Harald's, I guess you have fabricated these yourself?




John

[tompas11]

I made a special holder for the thermistor so I could mount it in the same place as the original thermistor.
I placed the 5,6 kohm resistor in a small plastic box.
This is the thermistor I bought: https://www.electrokit.com/en/product/n ... kt-jst-xh/

[windmill john]

Thanks again.



John

[Rattlebattle]

I don’t have a Himalayan so this may well not be possible, but when I bought my C5 new in 2015 a few of us removed the O2 sensor in the exhaust header and put a resistor of a fixed value into the connector into which the 02 sensor had been plugged. This was before I fitted a carb. This arrangement fooled the EFI into thinking it was receiving a signal from the O2 sensor but it was of course a fixed value that made the mixture richer throughout closed loop running. I think mine’s still fitted. My point is whether or not the presumably more sophisticated EFI on the Himalayan could be fooled in the same cheap way. Probably not....

[Harald]

Harald, purely a tentative question. Would you be willing to make me one? Paid of course. Or maybe an exact component list?



John

Hi John,
is there any way I can contact you?
The components of the new sensor are as tompas11 described, but not so the mechanical arrangement. I made a new sensor hull from aluminium that fits in place of the original sensor. The 6,8 kilo ohm resistor is integrated in the sensor, so no external box is necessary.

[Harald]

[/quote]
Very nice. I'm glad that you got good result with your home made booster plug. I'm very pleased with mine and it's still working lika a charm.
[/quote]

Hi,
Thank you for sharing your knowledge with us.
We really appreciate it.
I am trying to figure out now what is inside the original BP. I think, there is no fixed resistor, but a second temperature sensor in line to the original one installed in the air filter box. This arrangement would give a more linear resistance swing over the temperature compared to a fixed resistor parallel to the temperature sensor. I will test such an arrangement.

[windmill john]

Hi Harald,

I have no real issues at the moment, but it seemed a good idea and something worth having as a back up possibly.
A couple of times if decelerating and then opening up, he has bogged.

If you look in my signature, there my web address.
To stop the trolls, if you substitute www. for john@ you’ll get my email address.

John