Carchet Add On Tire Pressure Sensor Kit - Mercedes Benz SLK Forum
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#1 Old 11-13-2016
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Carchet Add On Tire Pressure Sensor Kit

I just wanted to post a follow up to my post a few months back on these in the "What did ou do today" thread. I have a R171, but these could be used on a R170 as well and just about anything else.
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Originally Posted by Pioneer4x4 View Post
Anxiously awaiting this for testing on my 3000 mile road trip starting Saturday.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
A few weeks ago I noticed 1 of the pressures and temps never changed, then I noticed another wheel say "lo" briefly which I assumed was a low battery warning. The other one might have done that as well, not sure. The kit came with tools to hold the caps and unscrew them so you can change the battery in them. I have read other reviews that suggest putting new batteries in before you even try them. The 2 sensors that acted up did have dead batteries, and the other 2 are weak. I bough a 4 pack of 5 from Amazon shipped for under $9 (They are Toshibas)
I will re-install them today and see if they all work again. FWIW, they use 1632 batteries. Also I decided to weigh them for kicks, they are very light, but they have to affect balance even if unnoticeable. I used them on my 1967 El Camino when I drove it to Woodward Dream Cruise in Detroit this August, and one front wheel that I normally would feel at highway speeds actually stopped, so it affected balance in a good way...
ANYWAY, they weigh about .45 ounces US, or about 12 grams according to a cheap digital scale I have. And the plastic caps they replace weigh about .5 grams. Pretty amazing considering that about 1/3 of that is the battery and the brass lock nut you thread on first and back against it (with a tool) to prevent theft.
As for the functionality of them, my only complaint is the display on the cigarette lighter plug deal is not easy to read. But considering it is infinitely more convenient then manually checking pressures, and getting instant notification if a tire is actively leaking via a beeping sound, the display is still very good. It will beep at 28PSI or less, which is a bit annoying in the fall when they will be 27,28 in the am one day, but you know it will be on average 30 degrees warmer the rest of the week, but a tap of the side button will silence it, or just unplug the display altogether. The temperature functionality is cool, but useless. In heavy traffic on a hot day, (even worse in a tunnel traffic jam) the fronts will really climb. I assume more from the hot air around them and engine heat coming out from under the front. They can show 40 degrees hotter than ambient in a situation like that. When driving it is cool to see the temps and pressures change typically 4-5 psi when warm. The temperature sensors measure within 1 degree of the car's outside sensor when driving in the rain, so I assume they are extremely accurate, just not useful, but hey, more info is always cool.
My only concern is durability. Being in the Pittsburgh area, our communities take horrible pride in keeping the roads clear and use a ton of salt and other ice/snow melting crap on the roads. As long as they stay sealed they should work great, but if any saltwater/slush crap gets in I assume they will die.
Admins feel free to move this to another section if it fits better.
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#2 Old 11-13-2016
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Originally Posted by Pioneer4x4 View Post
My only concern is durability. Being in the Pittsburgh area, our communities take horrible pride in keeping the roads clear and use a ton of salt and other ice/snow melting crap on the roads. As long as they stay sealed they should work great, but if any saltwater/slush crap gets in I assume they will die.
You drive your baby in the snow ?
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#3 Old 11-13-2016
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Originally Posted by LeonardoDaBenz View Post
You drive your baby in the snow ?
Pittsburgh. What more can be said.
They make 'em tough out that way.

And they get worse snow than the UK.

Kudos!

And sympathy for a fellow salt sufferer.

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#4 Old 11-13-2016
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Quote:
Originally Posted by LeonardoDaBenz View Post
You drive your baby in the snow ?
1 - Yes, my other option would have a "normal" car as my everyday car, and never drive a "nice" car.
2 - It sits outside as well.
3 - If you like a car this much, why not drive it! They come on wheels, not pedestals. They really aren't that expensive used, and make nice cold weather cars, if not great for actual snowy roads. (that air scarf is NICE on cold mornings)

I really like driving special cars everyday, I have almost always had a "niche" vehicle. BUT, I only have a 2 car garage, and my wife's car is obviously in 1 spot, and my 1967 El Camino is in the other. That is something that I will not drive when wet below freezing, or even if it warms up and the salt is still on the roads. I wait 2 rain storms after salt before I drive it. (not a real long time in Pittsburgh)

(I do also have a 2002 Jeep Liberty that was my Son's that needs to leave my driveway, and I would love to keep it for those 4 days a year with many inches of snow on the road, but it has to go)
A could guys at work have Camcords, and Corollavics, and us car guys just think that they just "Gave up" and don't care anymore what they are sitting in 5-10 hours a week. Before this SLK bought a 2004 Chrysler Crossfire last year with only 5,600 miles on it. I drove it for 8 months and put 9,000 miles on it then traded it on this SLK. My main car before that was a 2006 Dodge Charger R/T that I had for 7 years and drove it until it had over 90,000 on it. I STILL miss all that torque (390), and I hope my next car will be a 2012-2013 Charger STR8 (470hp & 470tq) but I am liking this SLK more than I thought, and I may look for a AMG or a 2009+ 300hp 350 someday.
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#5 Old 11-13-2016
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Quote:
Originally Posted by Avel Du View Post
Pittsburgh. What more can be said.
They make 'em tough out that way.

And they get worse snow than the UK.

Kudos!

And sympathy for a fellow salt sufferer.
Thanks!
I try to tell people that the issue with Pittsburgh isn't just the snow, but the fact that there isn't a straight flat road anywhere. Typically you are on a up or downhill on a curve with a stop sign or traffic light halfway up or down the hill. Pittsburgh is a city governed significantly by the local geography. (more bridges and tunnels than any other city, and it is a medium city at best)
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#6 Old 11-13-2016
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We're not as bike but when I was a 365 biker I've shared your pain.

Coming home from a night shift in the snow.

First I got overtaken by an AMBULANCE not on a call!

Then, as I was coming off a railway bridge, the lights at the bottom were going nuts.
Just cycling through the changes without pause.
Couldn't brake, engine braking was doing nothing.
I thought I had less prospects than a cheerleader try out in your home town!
Just had to hope nothing crossed my path and be ready to dump the bike.

Got away with it, but had a warm seat all the way home.

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#7 Old 11-14-2016
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I watched a couple youtube videos and seems pretty easy to set the upper and lower pressure alarm limits, also looks like you can set a upper temperature alarm, I may play with that for kicks, but probably not until it gets hot again, which could be May, or Thursday, never know.
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#8 Old 11-15-2016
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I aired up my tires and put them on this morning on the way to work. They are all working fine again with new batteries. I got a PDF of the instructions. It is 5.5mb and I can't attach it, but I can email it to someone if they want to see it.
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#9 Old 01-23-2017
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Another update. The Left rear one killed another battery. I think it might be stuck "on" and not sleeping when parked. I am doing some math on the life of it now. It seems to draw 80ma intermittently, but that seems like it would die in a couple hours on a CR1632. I guess what I really need to know is how often and how long it transmits. The specs on 1632 batteries seem like 140mah is all they hold. Since I had the runflat monitor enabled, I plan on testing by letting some air out and driving to see if the car gives any alerts, and at what threshold. I really like these things, but if they eat batteries, it is not worth the hassle. From the couple of times I get alerts on other cars, I have grown fond of a TPMS system. Twice on other cars I got a low pressure alert while driving and it allowed me to pull over somewhere safe and convenient to check my tires. Both were puncture leaks that I got alerted on sooner than hearing/feeling the wump-wump of a tire going out.
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