I just installed the Quadzilla Commander and on my first run with it I bunched it to get on too freeway and I saw my EGT jump up too 1500 F very fast[sm=insomnia.gif]. Need less to say I let off of it right away. I detuned and now I am around 1200-1300F, is this still to high?

Thanks.

 

Well, i start backing out of mine at 1200, pre turbo, 1300 if I am almost over the hill, but never more than a few seconds, The melting point of aluminum is 1200 degrees if I remember correctly, Is your pyro probe pre turbo or post turbo? If its behind the turbo your egts are actually higher than your readings, To answer your question 1200-1300 is too high to run for very long IMO.

 

1200 is too hot/back off!!!!!!!!!

 

1200 is getting warm. . .but the 3rd gen HPCR can run 1100-1200 all day long without any problems. . .1350 and higher is when you have to start backing out.

12valves and 2nd gen 24 valves can only handle upwards of 1200 due to piston and head design and metalurgy. the 3rd gens have different alloys for the construction of the pistons and have valve seats to keep things from going bad.

spikeing above 1350 only for a few seconds wont hurt a thing. it is holding it above 1350 for an extended period is when you'll start to melt things. also when you get above 1600F things will begin to go awry real quick unless your engine is setup right.

also note, the temps I quote are pre turbo. . .post turbo will be approx 300F cooler.

 

I always back down at 1350. Until then, I don't worry about it. Most of the time I don't hit these type numbers unless I am towing and going up a big hill. So my numbers don't stay up there for long.

 

I'm assuming you are talking before the turbo - right?

What is there, a 3 or 400 degree difference between pre turbo and post turbo?

 

the backpressure before the turbo is higher for one. . .plus the probe is closer to the actual heat source

 

On a truck without a tuner, do you have to worry much about the egts?

 

Thanks guys!

The temps are pre turbo. Any idea how much I might be able to reduce the temps by removing the cat and install a free flowing muffler?

 

yank the muffler out and installing a straight pipe or a flow through muffler will reduce EGT's alot. removeal of the cat doesnt do much. . .maybe 50F at the most.