I would have inquired in the turbo gauges thread, but Wits End pissed everyone off & all the comments to that thread derailed it & it is now locked.
Anyways, currently running the JRP 14in1 gauge in the LX450 with the turbo kit that’s now gone extinct.
What would be an ideal temp setting for the alarm feature on this gauge.
I have EGT running behind my AFR reading.
So I’ll only see EGT temps if they go over a certain programmable temp threshold.
It’s currently set at 1,950 degrees F. I’m currently running very rich, so I’m getting temps pretty high at a few seconds at a time. That all is being discussed in my thread “Under 8 MPG”.
Question is too low, too high? What is a normal range & what is considered hot & too damn hot?
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Great topic, AFR plays a huge factor here.
Same principle different application, aircraft turbo charged piston engines.
The location of the probe / probes plays a part, we measured Manifold pressure fuel flow GPH, RPM, to determine percentage of power. Anyway best power occurs 125 degrees Rich of peak EGT, has the nose cylinder pressure and hi CHTs. Now peak egt dependent on altitude and temperature ect near sea level it was as high as 1550-1700 egt normally on most turbo charged aircraft engines but flown TIT near the turbo. Best cooling of cylinders same altitude flat out occured 200-225 degrees rich of peak. Hi power full throttle power, if the pilot didn’t run these engine with these things in mind cylinder cracking can occur. Once you in cruise you couldn’t make peak egts at lower available power settings. Therefore cruise egt would be 1400 ish degrees 1200-1250 at the cylinder heads ports, was good hi power. Now your question is a max egt, if compared to aircraft engines, where is the temp probe,
If your AFR is correct, .80 less Lambda under hi power Wot , egts should take care themselves and monitor that temp as a possible limit maybe 50-100 higher. Once engine power is down and engine feed back closed loop operation is occurring, 1.0 lambda average 14.7 AFR gas not ethanol it like airplanes will be lower.
But it not bad to watch egts, I would be more concerned of AFR at hi power settings. It’s a main component of EGT “mixture” as you add more fuel under high power it cools the egt, That simple. gas turbo engine, not diesel.
Components I would image high temp limits, aircraft was 1750 degrees was for a higher quality exhaust and 1650 was lower stock exhaust piping.
That temp was taken at the turbo inlet exhaust side.
It temps taken at exhaust ports was lower. Mutable probe egt engine Monitor we used.
I gave theory here, gas turbo charged engines. Aircraft we control the mixture manually to account for altitude and different power settings.
11.8- 12.5 AFR gas, runs great best power until it melts something. Hence 125 Rich of peak hi power hi cylinder pressures, ect … avoid that when Open loop under hi power is my recommendation.
There is a conversion for GAS to Lambda my AFR gauge does it for me. Boosted Supercharge 100 series intercooler v8 4.7. I keep it in lambda since I use premium fuel and E85. When boosting I keep an eye on Lambda AFR make sure wot hi power Atleast .80 or lower.
Hope it helps or was totally confusing.
Take care
Tex
