Head Temperature Control Knob (manual Temp sensor II)

[dreadlocks]

If you have a working TSII id wire a double throw relay up to it, NC to the TS2 & NO to the Pot.. Then put a switch next to pot, flip it on to shut off the TS2 and go manual...

I have a Wideband o2 on mine and this does seem worthy of exploring; I know exactly what my AFR is.

-R
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2013 4dr Golf TDI w/Technology & Tow pkg
2001 GTI - 3.0L VR6 Turbo
1975 Westfalia - 2.0L Fuel Injected

[johnlynch47]

I tried to replace the sensor and it broke off, and I just didnt want to pull the motor (yet) to fix it. So I am bypassing it with the switch, just to follow up, before I knew the sensor was bad I tried to adjust the throttle. I then discovered the sensor was bad, figured out this switch, it started and ran great like I said at 2500ohms. I then was driving home and remembered the throttle adjust, so I made sure it had warmed up then set the swictch to 50 ohms (ran terribly) adjusted the trottle so it ran nice, now it works like a champ. Im going to drive it for a bit to see if there are any other problems before I pull the motor (or pay someone to pull it) to get the hole rethreaded (easy out did not work) and anything else that needs fixin. so there ya go. anything you feel like im missing?
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"My shovel is sharp, my pick is sharp, and my will is outstanding." - Rod Marinelli

"I've got a good heart, but this heart can get ugly" Rapper DMX

"Bring your face over here so I can smack it" My Mom

1977 Sage Green Westy up in this!
her name is Velma
1994 Chevy Silverado - Mater
2006 Kia Sedona - Pearl

[Wildthings]

[johnlynch47]

REALLLYYYY?! Are there any dementions forth coming? or am I to eyeball it? Anyone have pics?
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"My shovel is sharp, my pick is sharp, and my will is outstanding." - Rod Marinelli

"I've got a good heart, but this heart can get ugly" Rapper DMX

"Bring your face over here so I can smack it" My Mom

1977 Sage Green Westy up in this!
her name is Velma
1994 Chevy Silverado - Mater
2006 Kia Sedona - Pearl

[Wildthings]

[VWinVT]

I know this is an older thread, but I was just recently linked to this thread by Danfromsyr (thanks Dan!). This is a great option for anyone driving an aircooled Vangon, as they are the hottest of the hot!! I have an 81 aircooled vanagon Westy, with California emissions. I have a working temp2, but am unable to reign in CHT. I have tried MANY things, without success. I am going to install this modification with a 5000ohm pot. From radio shack. My plan is to simply unplug the working temp2 and tape up the end. I will attach a wire to the temp2 harness connection and run it to the dash and attach it to the pot. I plan to ground the pot. On one of the open key on the grounding rings under the dash.
My primary question is this, I have a whole reel of 14gauge wire. Will this gauge wire work for this purpose. Also, is my wiring/grounding design feasible? Thanks
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1981 Westfalia with a 2001 Cabrio ABA

Small wheel turns by the firing rod,
Big wheel turns by the grace of God.
Every time that wheel turns 'round,
You're bound to cover just a little more ground.

[cmonSTART]

I'm very intrigued by the idea of a manual TSII option. That's right up my alley!
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'78 Bus 2.0FI
de K1IGS

[VWinVT]

Ye olde thread bump.....

[sestino]

[SGKent]

anyone with a catalytic converter needs to know this strategy won't work without burning out the catalytic and everything else around it. They turn cherry red when too much unburned fuel goes thru them. Even at 13.3:1 or so at freeway speeds I can see the slight deterioration in mine just in 4500 miles. And that is 18 - 20 MPG.
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“Most people don’t know what they’re doing, and a lot of them are really good at it.” - George Carlin

[tootype2crazy]

You know, a much better solution to all this theorizing is installing a wideband O2 sensor with a gauge, such as the innovate MTX-L. I have one and I've noticed that the fuel/air mix changes with the seasons. I can precisely tune the mix on the AFM to my liking and keep an eye on the mixture all the time. It's the ultimate gauge.
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air-cooled or nothing for me
1978 Sunroof Deluxe Bus (daily driver)
1978 Transporter (mom's, making into a camper)
1970 Single Cab 2.1 turbo/EFI 6 Rib, 78 front beam, vanagon backing plates on rear (project)
2001 GTI VR6 (wife's)

[57babywindow]

I just did this on my '75 Bus. Radio Shack 5k ohms potentiometer. It cost me about $4. I used some wire I had in the garage. Tested it at the motor before running it to the dash. Drilled and mounted it next to the headlight switch. It works great.

[Stuartzickefoose]

[airkooledchris]

Run the stock TSII signal up to a switch on the dash, so you can toggle between the stock TSII signal and the potentiometer.

I also run an Innovate MTX-L so I know what the adjustments are doing to the mixture.

In short, I'll run the stock TSII signal most of the time for in town driving, but toggle over to the potentiometer when I hit higher speeds on the highway so I can richen up the mixture.

It really helps identify the ranges in which your motor is happiest when you have the MTX-L to tell you the current mixture while you adjust. You can then adjust the AFM itself to a better middle-ground point, which makes adjustments with the potentiometer much easier.

[Gregg in the 603]

I'm not much of an electrician, but can follow directions and this just makes sense. I really would stop worrying if I could drop 30 degrees when needed. I see the radio shack potentiometer and will buy the 5k one. Any chance you can share a picture of your setup Chris and also your switch? They're cheap enough, I'll buy them for when Colin shows up, we have this as an option.
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1979 Mexico Beige Westy auto
Dirty Dover, NH

[airkooledchris]

[Gregg in the 603]

Love this, thanks a lot, I'm gonna give it a shot
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1979 Mexico Beige Westy auto
Dirty Dover, NH

[Gregg in the 603]

Wow, this thread was a game changer for me. I've been battling high CHT's since a recent rebuild. A visit from Colin helped us address the AFM mixture a little, but like Chris, the temps were still pretty high. I installed the potentiometer under the dash and use it on hills. It is amazing, I haul my loaded bus up hills that before would break 440 degrees. With a little dialing-in, I can get the temps to stay below 410 and even lower if I want. With enough ohms, the temps actually drop on big climbs! I don't use it too much, but wow this is a tremendous relief!
One thing I did notice is that there is a slight loss of power the more you increase the ohms and it richens up. I didn't expect that, but small compromise. It truly expands my bussing abilities! I'm not terrified of big hills and higher speeds.
Thanks for the hook-up on this, I love it.

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1979 Mexico Beige Westy auto
Dirty Dover, NH

[cmonSTART]

Good stuff, thanks for posting your experience with it! I'm considering doing it just to have a "back up" if my ts2 fails.
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'78 Bus 2.0FI
de K1IGS

[Gregg in the 603]

Dude, I'm telling you, this thing is AWESOME! I ran up and down 89 at 65mph and saw 410 and lower! You know how 89 can get, those hills are looooooong!
A true horizon-extender this hack is!
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1979 Mexico Beige Westy auto
Dirty Dover, NH