First ride with boost and exhaust gas temperature guages

[Michael Fowler]

and the results are .......
idle under 200 degrees F and slight vacuum
40 mph 200 degrees no boost
50 mph 250 degrees no boost

hard acceleration--climbing a hill at about 55 mph--- max temp observed 350 and max boost about .2 atm

Truck is a '94 7.3 factory turbo
IP is a takeoff from a 6.9 NA truck I used to have.
Looks like I can turn up the fuel quite a bit.
Going to have Mel set the timing--when I can get there during business hours.

I invite your comments

 

[79jasper]

Where do you have the pyro probe?


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And should be seeing more boost than that. At least a few psi.

 

[laserjock]

Notice he lists boost in atm units not psi. There's about 14.7 psi to atm. So that's about 3psi if my math is working. Probably should be making a little more but the temps are pretty low. I'd say turn it up!

 

[79jasper]

Lol
I thought he meant "at the moment."


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[laserjock]

Well I don't think so but he'll have to clarify. I seem to remember he bought some fancy gauges. Wouldn't be unusual for a scientific type gauge to be in atm.

 

[Michael Fowler]

Thanks for the replies.

Probe is in the driver's side exhaust manifold at the end nearest the firewall.
Gauges are not fancy ( budget is TIGHT!!!), but are about the least expensive I could find.
Calibration in atm was not a problem since the term was familiar.

 

[whiteboyslo]

EGTs seem very low. Idle should be 200-300 (depending on how long you let it idle), and that romp up the hill should have put the number in the high 100s.

Mike

 

[firehawk]

Those numbers are so low, I would not trust the gauge. How far from the turbo is it? You want it close to it or in front of it.

 

[TWeatherford]

He said The probe is in the drivers exhaust manifold. That's the hottest place because cylinders 6 and 8 fire one right after the other. I agree, the numbers seem really low. I would have to suspect the gauge. Are you sure the temp is in F and not C?

 

[whiteboyslo]

Are you sure the temp is in F and not C?

That'd almost make sense for the cruising and hard acceleration runs (200°C = 392°F, 350°C = 662°F). Still doesn't make sense that idle is that high, though (assuming it is °C).

Mike

 

[riotwarrior]

Two questions, what brand and model of guages are they?
Is the pump a used IP?

If USED IP you may want to step up to a newer one if possible as maybe the pump is not delivering enough fuel. You could turn it up some to see if that gets you some boost.

 

[laserjock]

Are you sure the temp is in F and not C?

Wondered that myself. It may be that 200 is the lowest marking on the gauge.

 

[Michael Fowler]

OK, update time.....
Egg on my face, the EGT gauge is in "C". I missed that.
Turned the pump up about 3 flats, and the power increase is pretty good. EGT also show more response, I did see almost 600 degrees C pulling a grade towing the trailer. I need to run the temp conversions, but I think 650 C is my MAX. I am a little bummed as I was happy to have a gauge that read to just 1200 degrees---if that had been "F", I would have been fine. As it is, I will sue half the gauge.
Need to really read the details before purchasing.

Max I saw on the boost was only about .4 or about 6 psi