Temperatures on my latest test run

[mrlindeman]

Sorry I have not posted pics yet but I wanted to share some data from my latest test run.
Inducer is 60 mm
exducer is 68 mm if I'm not mistaken.
Fueled by propane.
10W-30 lube oil for journal bearings at 35 PSI oil pressure.
9 inch long by 3 inch diameter exhaust nozzle with 10 degree reduction at last 3 inches.

Ok, now the fun stuff lol.
At 5 psi boost self sustain idle after 10 seconds oil pressure remains nice and stable, with oil temp at 114 degrees Fahrenheit.
EGT is at 500 degrees Fahrenheit.
No surge and smooth running.

At 10 psi boost after throttling up I let it run for 10 seconds.
Oil pressure still good.
Oil temp creeps to 135 degrees Fahrenheit.
EGT is at 780 degrees Fahrenheit.
No surge and running smooth,, and loud lol.

This is all at full self sustain with no issues. Today I will be firing it up and running at 7 psi boost; and going to cook a nice sausage with it for lunch lol.

My question is that these temperatures seem low. Not a bad thing but I'm just curious as to whether or not this is common since the topic of temps is kind of back and fourth. Thanks for any info.
Also how hot is too hot?
I have heard not to let the EGT get past 1200 degrees Fahrenheit
And to not accede 280 degrees Fahrenheit on the oil temp.

[racket]

Yep , your temps are "low" but only because of minimal backpressure on the engine .

What diameter is your jet nozzle ??

1200F is a reasonable TOT , lube max temp will depend on its type , best to use synthetic .

[mrlindeman]

The jet nozzle is 3 inch diameter. Same as the scroll outlet from the turbine.
I will get some 5w-30 synthetic.

[mrlindeman]

Here is a picture of the setup.









I have done research and read the thread here on jet pipes. Any good suggestions on my setup for a better jet pipe that won't cause my temps to go crazy at a running P2 of around 15 psi? Thanks so much for your help John. 
Bud.

[racket]

Hi Bud

Try a nozzle about the same size as the comp wheel inducer , this will increase backpressure a tad along with your temperatures , but eventual nozzle size needs to be a trial and error thing , slowly making it smaller until temps reach your desired max

Cheers
John