SG II Accuracy?
I'm hitting easy street
Joined: Nov 2009
Posts: 6,395
Likes: 27
From: Central Oregon
I was going to go get a thermometer and my laser temp gun and my Torque APP (which you see in my other post) for phone, the SGII, my wet finger to stick in the wind and check temps for you guys, but crap, I plugged in my truck a little while ago so the test is off until next weekend. LOL 
Wait a minute, I could use this as a reason to get an AE!!!!!! woohoo!!!
Just joking gentemen, just joking.
Wait a minute, I could use this as a reason to get an AE!!!!!! woohoo!!!
Just joking gentemen, just joking.
Hotshot
Joined: Dec 2003
Posts: 15,368
Likes: 121
From: Stuttgart, Ar
It should be relatively easy to take an infared laser scanner and, at least, verify fWT vs. ECT and EOT by shooting the sensors. There can't be that much temperature difference in less than a 1/2 inch of pot metal (EOT) sensor. The ECT should be really close.
It's hard to run AE and SGII at the same time without somekind of splitter but at operating temperature the sensors should all read the same IF the PID's are the same.
It's hard to run AE and SGII at the same time without somekind of splitter but at operating temperature the sensors should all read the same IF the PID's are the same.
Hotshot
Joined: Aug 2006
Posts: 17,398
Likes: 317
From: Whittier, CA
I'm not sure you have to wait for cold soak to check comparison between sensors. Oil and coolant should be pretty close to the same after an hour. They are all going to be whatever the engine block temperature is. That's with the engine off of course. I haven't checked this, but I think I will just out of curiosity. Because the fluids are not flowing, they are quickly going to stabilize at block temp. TFT would be totally different.
I would be surprised if you got any useful data from a laser gun on the outside.
I would be surprised if you got any useful data from a laser gun on the outside.
Junior User
Joined: Mar 2007
Posts: 62
Likes: 0
From: Zanesville,OH
Just curious myself . Got a sc ll for chrismas and installed the monday after . Start watching ECT & EOT. ECT temps. would only get to 179* . I had a delta of 20* -22* . Done a coolant flush with vc-9 & backflushed heater core. Installed new MC t-stat with housing. ECT only show 188* max. Now delta is 18*-20* . Possible SC ll problem?
Hotshot
Joined: Apr 2010
Posts: 19,060
Likes: 238
From: Saratoga Springs,UT
That goes for me too
Just Cuz a couple guys readings are off Doesnt mean its the SGII it could be there sending unit or wire chaffe/shorted wire.
As with anything eles there could be a Bad SGII out there to
But for the most part I think that the SGII are right on the money and theres a TON of folks that own them and watch them like a Hawk
Freshman User
Joined: Feb 2011
Posts: 49
Likes: 0
The ECT is close but not exactly the same as fWT in my experience, maybe just reaction time difference, I say try them both and see because you can watch them at the same time. If you feel like it try the +6 version I posted and let me know your numbers please!
Junior User
Joined: Mar 2007
Posts: 62
Likes: 0
From: Zanesville,OH
Yes I will try tomorrow. I don't drive the truck very much because I drive a company truck home, but will take it out tomorrow to check and let u know. I'm just tring to make sure if I have a SC ll problem or oil cooler problem. Don't want to go in deep if I don't have to. I've read a few post on here where they have done oil and egr coolers and getting same delta readings as before replacement.
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Hotshot
Joined: Aug 2006
Posts: 17,398
Likes: 317
From: Whittier, CA
I just checked my temps after sitting for 4.5 hours. I had 82 coolant and 87 oil. So I guess they don't cool off equally as I had expected. Tranny was down to 77. It is about 54F outside here.
Hotshot
Joined: Apr 2010
Posts: 19,060
Likes: 238
From: Saratoga Springs,UT
Yes I will try tomorrow. I don't drive the truck very much because I drive a company truck home, but will take it out tomorrow to check and let u know. I'm just tring to make sure if I have a SC ll problem or oil cooler problem. Don't want to go in deep if I don't have to. I've read a few post on here where they have done oil and egr coolers and getting same delta readings as before replacement.
Its good to make shure the Gauges are reading right for shure
But in some of those cases where the oil cooler had been changed and the deltas remained the same could be a Coolant flow issue as in a BAD Water Pump,cavitated front cover. Hard to cool the oiol without any coolant flow. But from reading a Ton on here 9 times out of 10 a New Oil Cooler does the trick.
Just a Little Food for thought
Junior User
Joined: Mar 2007
Posts: 62
Likes: 0
From: Zanesville,OH
Its good to make shure the Gauges are reading right for shure
But in some of those cases where the oil cooler had been changed and the deltas remained the same could be a Coolant flow issue as in a BAD Water Pump,cavitated front cover. Hard to cool the oiol without any coolant flow. But from reading a Ton on here 9 times out of 10 a New Oil Cooler does the trick.
Just a Little Food for thought
But in some of those cases where the oil cooler had been changed and the deltas remained the same could be a Coolant flow issue as in a BAD Water Pump,cavitated front cover. Hard to cool the oiol without any coolant flow. But from reading a Ton on here 9 times out of 10 a New Oil Cooler does the trick.
Just a Little Food for thought
Posting Guru
Joined: Jul 2006
Posts: 1,181
Likes: 1
From: Fairfield, CA
I just added the 6 to ECT now my brand new thermostat opens. 
Guess I didn't have to beat the **** out of my 05 EX trying to get the air out of my coolant system for days. 
Sorry to go off topic but could I ask what you guys have your "Cutoff" set at. I'm also trying to get my MPG to stop going to 9999 every time I let off the accelerator pedal. Thanks
Guess I didn't have to beat the **** out of my 05 EX trying to get the air out of my coolant system for days. Sorry to go off topic but could I ask what you guys have your "Cutoff" set at. I'm also trying to get my MPG to stop going to 9999 every time I let off the accelerator pedal. Thanks
Freshman User
Joined: Feb 2011
Posts: 49
Likes: 0
My cutoff is at the factory default and seems to be pretty accurate for when the truck cuts the fuel on deceleration. I'll check the actual value in a bit. Is your SG showing 9999 even on a partial throttle lift off?
Posting Guru
Joined: Jul 2006
Posts: 1,181
Likes: 1
From: Fairfield, CA
Thanks for helping. It only goes to 9999 when I completely release the pedal.