Being such a maestro of masochism, I've made EVERYTHING in my latest project RX-7 custom. One of my most success immolations has been the "genius" to revamp the entire coolant system for use with a Craig-Davies Electric Water Pump (EWP).

So what do this have to do with Haltech, well one of my problems is that I need to plumb in THREE water temp sensors (E6K, EWP, and HKS water temp gauge) and I only have one place currently set up (without the added complexity of welding a boss to the CUSTOM C&R radiator). Since there is no longer a water pump housing with it's convenient NPT access ports, I'm left with:
1. The coolant outlet pipe for the heater hose on the drive side of the rear end housing
2. The stock coolant gauge 1/8 NPT port in the rear housing

I've tapped the inside of the coolant outlet pipe to accept a 1/4NPT compression fitting. This is where I expect to mount the EWP sensor with a 1/4 compression fitting. Not sure yet where I'm going to mount the HKS water temp sensor, but since it'll also require a 1/4 compession fitting as well, it'll be a relatively easy solution.

So finally, here is what I'm asking for help with:
Does anyone know of a sensor similar to the stock temp gauge sensor that will thread into the stock 1/8NPT port BUT has a tempature/resistance response suitable for use as a substitute for the Haltech water temp sensor. I'm hoping and assuming that surely another OEM water temp sensor out there uses this almost industry-standard thread size AND has a response similar to Haltech's requirement. I've check the stock gauge sensor and it's response is incompatible with the Haltech water temp sensor. I also checked the usual stock thermosensor, and though it has an acceptable response, it obviously will not fit in the 1/8NPT port either.

So hows 'bout helpin a brotha out and showing me the way...

 

Bueller... Bueller...

 

Anyone have a answer to this i would also like to know! thanks

 

MMonaco, after quite a bit of searching I could not find the sensor I asked about. In the end I mounted aluminum Earls NPT bosses to my C/R radiator. Seems the 1/8 NPT sensor with the Haltech/GM compatible curve remains elusive... sorry!

 

Damn, thanks for the reply.

 

if the radiator hose remain the same size...
i think this may help"http://www.g-motorsports.com/gs-wateradapter.jpg"
link "http://www.g-motorsports.com/ac_technics.htm"
that web is for civic, but many like that is for universal.

hope you get what i mean.
would you please let me know more info about your electric water pump set-up, i want one for my car.

thanks

 

I run into the same problem also when I use electric water pumps. Your only choice is on the return from the motor to the radiator basicaly where you got it on the radiator would work fine.
The factory 1/8 bsp hole on the rear housing and the heater hose outlet is not going to give you the proper reading. I've always got a much lower reading on the rear heater outlet than on the water outlet to the radiator. I believe it was around 20 to 30 deg. difference. The factory gauge is calibrated to read form that location but when you think about it the factory gauge is a POS. anyways.

 

what kind of ewp you guys use?
where do you buy them at?
i really want to know...

 

Any follow up or pictures?

 

Why can't you redrill and tap the bitch out?


-Ted

 

Motec has an 1/8" NPT water sensor in their catalogue, and I'm sure they would be able to tell you if it responds the same as the standard GM 3/8" NPT sensor.

 

It does not, they are two different sensing elements. The Delco part
reads 3300 ohms at 20C and the Bosch sensor reads 2500 ohms at 20C.

^from MoTeC USA

 

If you are looking for the TAP for the Haltech water and air temp sensors, its not 1/8" its called 3/8"NPT.