Well, I know what they are for, but sure how they look.

I got my ScanguageII hooked up and several of the formulas entered for the different x-guages and the live data they provide. I need to know how some of my data looks. I have a stock 2000 7.3 with almost 200,000 miles.

Last Saturday I did a test run to get some baseline data for my EX.

40-45 degree morning, after a 20 minutes of warm up at idle, I did a 20-25 mile round trip loop and recorded some data.

At cold start: 733 rpm, 493 ICP and 11 IRP

As the engine warmed up: 683 rpm, 473 ICP, 10 IRP, 147* EOT

55 mph, criuse set mostly flat ground: 1582 RPM, 950-980 ICP, 15 IRP, 180 EOT and Boost 2.1 #

65 mph - cruise set, mostly flat ground: 1870 RPM, 1350-1450 ICP, 23 IPR, 194* EOT, 181* ECT, 121* TFT, and 3 # boost

Setting in drive way upon the return temps were: 191* EOT, 174* ECT and 128 TFT

I was seeing EOT and ECT that were 12-17 degrees apart. I know that delta is a red flag for a 6.ohhh. Does it really matter for a 7.3??

I did a few stops and WOT take offs - Boost at 17.7 psi was the highest I saw, if the guage is correct. Is that about normal for a stock 7.3? or do I still have a leak somewhere?

I will say the ScanguageII is a slick little tool for the money.

 

Nope. Ignore the ECT readings because it's a make believe figure. It has nothing to do with actual coolant temp....in fact, your coolant temp sensor isn't even connected to the PCM (unless you have a manual shift transmission).

All your other readings seem to be in the normal range. TFT seems a little too cold but there isn't really all that much you can do about it during the winter months.

 

When I spoke with Ron, the inventor of the ScanGauge, he said the coolant temps are more accurate on the Scan Gauge then any other gauge out there on the 7.3, said it is the EXACT real time temperature of the coolant.

I'm waiting to talk to him again but I'll get the reasoning behind that for you when I do.

 

That can only be true for manual trans vehicles.
4R100 models have a PCM that estimates the ECT value. There is nothing in the ScanGauge that can make the PCM estimate more accurately. If you want to confirm for yourself....unplug the coolant temp sensor and see if that has ANY effect on what the ScanGauge is reporting.

 

Like I said, it's was what was told to me. I'll be talking to him again soon, I'll find out.

 

I towed my boat today to get it winterized, drove it pretty hard. TFT went up to 150 and stayed there - even driving home with no load.


Are those ranges for these readings actually listed anywhere?

What is a high EOT, TFT, ect that you do not want to see?

 

Most of us are comfortable with TFT readings that are 60-80 degrees over ambient. Sounds like you may have a supplemental transmission cooler installed on your truck. Normal range for my trucks while towing is 175-195 degrees. I might see 200-205 at the top of a long steep grade at max gross combined weight. I would probably pull over and let the engine idle in park if I ever saw temps in the 220-230 range and would be quite nervous to see 250-260 degree temps. I have no idea how high is too high...Mercon V can still do its job at fairly high temps but I don't know where that upper limit is. My guess is there are a number of variables involved...

I am not too certain on the EOT readings but I would expect something in the 200-230 range while towing heavy. You might want to back it down if you saw oil temps in the 240-250 range since the OEM HPOP hoses are only rated for 260 degrees (if I remember correctly...). Unloaded oil temps should be right around 190-195 which is about the same temp as the OEM thermostat in the engine cooling system.

If you have an automatic trans and want to know the engine coolant temp then install an aftermarket gauge. Since you have a ScanGauge already, then the next three most practical gauges to get would be EGT, Fuel Pressure and ECT.