Temp sender question

[Thealien]

Does anyone know the resistance/ohms of our temp senders?

The reason I ask is I am swapping an LS engine in and am looking for a temp sender that might screw into the LS head without an adapter that would work with our factory gauges that I am keeping (for now)

I know some of you smart guys have a good answer'

[68gmsee]

ttt for you.

I looked through my mnauals and couldn't find the answer to that one. Probably would be just as easy to buy one and take a reading off of it. Local auto parts store has them for about $5.

Or ask them to take a resistance reading on one for you. If you do a lot of business with a local parts store they usually will try to help you if they're not super busy.

[Thealien]

Originally Posted by 68gmsee

ttt for you.

I looked through my mnauals and couldn't find the answer to that one. Probably would be just as easy to buy one and take a reading off of it. Local auto parts store has them for about $5.

Or ask them to take a resistance reading on one for you. If you do a lot of business with a local parts store they usually will try to help you if they're not super busy.

Problem is they are all 17 year old if I don't have a part number or year and model they can't find it kids !!

I also think the ohm reading is at like 160-200 degrees so reading them cold won't help.

The answer is out there and when I find it I will help others and tell them!!

Thanks BTW

[john]

Heres a link to cutting a 1/2 npt down to 3/8 npt to keep from using a bell reducer adapter. Also some of the trucks have put them in the intake manifold.
There has been more posts on cutting them down, I just haven't found them.

http://67-72chevytrucks.com/vboard/s...d.php?t=196755

[Thealien]

Originally Posted by john

Heres a link to cutting a 1/2 npt down to 3/8 npt to keep from using a bell reducer adapter. Also some of the trucks have put them in the intake manifold.
There has been more posts on cutting them down, I just haven't found them.

http://67-72chevytrucks.com/vboard/s...d.php?t=196755

Old post, too bad he wasn't still active?

No putting them in the intake of the LS engines, they are plastic with no coolant running through them.

[OhOneWS6]

Most aftermarket guages use a range of 33 to 240 for all the gauges. Many OEMs are a different range. Not sure what the range is for the factory truck sender but it would not surprise me if it is the same range as the factory LS temp sender.

[Thealien]

Originally Posted by OhOneWS6

Most aftermarket guages use a range of 33 to 240 for all the gauges. Many OEMs are a different range. Not sure what the range is for the factory truck sender but it would not surprise me if it is the same range as the factory LS temp sender.

I sure whish that was the case but the LS temp sender is wired to the PCM instead of the gauge. If it were that easy (I really hope/wish it was) I think the few places doing the swaps would be using just a sensor instead of using all the adapters. On LS1tech there is a guy that had his turned down and threaded 12 X 1.5 mm that the thread for the sensor is but his was a newer engine with a smaller sender. The smallest part of my sending unit is 13mm+ which is bigger than the 12 mm hole.

[OhOneWS6]

Originally Posted by Thealien

I sure whish that was the case but the LS temp sender is wired to the PCM instead of the gauge. If it were that easy (I really hope/wish it was) I think the few places doing the swaps would be using just a sensor instead of using all the adapters. On LS1tech there is a guy that had his turned down and threaded 12 X 1.5 mm that the thread for the sensor is but his was a newer engine with a smaller sender. The smallest part of my sending unit is 13mm+ which is bigger than the 12 mm hole.

Forgot about the PCM. Looks like there are a couple of threads here with people selling senders that work with the factory gauge but have been turned down to fit the LS head

[Thealien]

Originally Posted by OhOneWS6

Forgot about the PCM. Looks like there are a couple of threads here with people selling senders that work with the factory gauge but have been turned down to fit the LS head

Been looking/searching. There was a guy turning them down for the TBI swaps 1/2 inch to 3/8 but I hadn't seen any turning them down to 12 X 1.5mm if you see one please post it.

The guy turning them down to 3/8ths hasn't been on in over a year?

[eagleuh1]

Drill and tap the head for the larger sender. Its been done by members on LS1 tech.com. Also, on my 96 Blazer I used an older model f-body sensor that hooked up and worked on my guage. Can't remember what year it was for but I got the idea off ls1tech.com also. Both ideas were for the passwenger side head, leaving the sensor for the computer in the drivers side head. Good luck. JIM

[OhOneWS6]

Check this site. It's a little hard to find but they have NPT adapters from 12mm to 1/8-1/4-3/8, or 1/2-inch NPT There is also an article on a 5.3 swap into a truck. I know you didn't want to use an adapter. I would call them and see what they say. Seems that they have done several of the swaps.

http://www.hotrodlane.cc

[Thealien]

Originally Posted by OhOneWS6

Check this site. It's a little hard to find but they have NPT adapters from 12mm to 1/8-1/4-3/8, or 1/2-inch NPT There is also an article on a 5.3 swap into a truck. I know you didn't want to use an adapter. I would call them and see what they say. Seems that they have done several of the swaps.

http://www.hotrodlane.cc

Thanks, very aware of their offerings and have read a bunch of their stuff. I am trying to avoid adapters for the reasons stated a post or two up.

[eagleuh1]

Try the 98 LS1 temp sensor. You'll use only the guage pins on it. The other pin goes to the pcm. I tried to get a pic of mine like i said on LS1 tech, but the thing is so tightly packed in my s10 Blazer it was a no go. The sensor fits in the passenger head without adapters. It is most likely same resistance as you're original sensor. Good luck. Jim

[eagleuh1]

This is for a 99 Ls1 Camaro.http://cpwstore.carpartswholesale.co...DETS10076.html

[clay68c10]

You can change the calibration of the gauge by changing the resistor on the back. I did this on mine because my 454 tends to run around 200 and that was in the red on my factory calibrated gauge. I think the original resistor is 66 ohms and I changed to a 75 ohm resistor. It put the needle in the middle at 195, where my stat opens. That was 2 years ago and i didn't write down my test values, DOH.

I used my laptop to read the temp value in my ECU and hooked in a variable resistor to the gauge to 'set' it where I wanted it. Then it was just a matter of installing the right ohm value resistor on the back of the gauge.

I bet this would work for your LSx, or any temp sender for that matter.

[eagleuh1]

Sorry, i used the 99 Fbody temp sensor, not 98. Jim