EGT's getting high, bigger turbo only answer?

S

s281jim

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Aug 30, 2007
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Yesterday I installed a set of RV275's. I am very happy with the performance. When I have the Edge Juice set on #5, I can watch the EGT's climb right up to 1350. I have the Attitude set to start de-fueling @1350. It works flawlessly as once it hits 1350 it crawls at a snails pace up to 1358 and by then I am well over 100mph, no need to lean into it any further. The thing that bothers me is I am sure there is more in it if it wouldn't start defueling. So how do you lower EGT's? I called my shop this morning and they said bigger turbo. Anything else? Not looking for N20 or meth suggestions. Can you help this newb out?
 
x2 on the larger charger. Then later you can install larger stixs, then a larger charger and on and on. Slippery slope.
 
1350? I think I hit that at 5 seconds of the pedal going to the floor. I have my defueling set to 1500. Maybe if I was towing heavy and it wanted to run consistently hot I might try 1350 (since it'll handle that temp all day), but that's not much to worry about really.

Get a bigger turbo than you think you need.
 
My pyro is pegged at 1600 by 55mph. It can take almost anything for a short time. Turn off the defueling and see how high it gets.
 
I will shut off the de-fueling and see, but doesn't aluminum start to melt at 1350? That is what a local kid told me. So I figured I'd set it for that. What is more realistic, 1500?
 
Well, Cummins made a statement that you could tow all day at full load with egt's at 1250*. Most guys start to lift around 1500. 1600+ for a short 5 second burst doesn't cause damage to most engines. Some fully built racing motors see 2000* at times. I personally don't like to ever see 1600, but I'm a little more conservative than others.
 
A cam could help extend the power range of the stock turbo. Stuff like head porting or a better intercooler might help too, but I'd do a turbo before anything like that.
 
I've seen 1300*+ while pulling some loooong grades, no damage so far, set your alert for 1350*, defuel at 1500*. That's where the damage can come in at.
 
Supposed to be 1500* is most aluminum melting. The pistons are a alloy blend that I think goes a little more. I guess it depends on the duration of the heat also. I know 1800* the rings start loosing tension.$.02
 
Depending on what you plan on doing with your truck in the future, you could go with a bigger charger but the temps your hitting now arn't terrible. But your probably making good power with it. I dont think I could name too many people that could turn their power all the way up and do a full 100mph run and not hit over 1350. It just comes with the added power. You could run it like you are if wanted but just not keep it at WOT for like a 30sc+ run.

Brett
 
I turned off the de-fueling today. From a dead stop I can run up well over 100mph and the highest my EGT's got were 1436*. I think my setup is pretty well balanced, so I think my upgrading is done for awhile. I am going to keep my de-fueling set at 1350* for towing purposes and in case I let one of my friends borrow my truck. Shutting off the de-fueling on the Edge is a simple 'double click' on the enter button so it's really handy. My max. boost I'm seeing is 32psi on a HX-35. That isn't enough to break anything I would hope. Thanks for your guys help with my build up, I have no idea why anyone leaves their truck stock.
 
Cool thats not hot enough to hurt anything. Sounds like its set up about right.
 
have you done the exhaust manifold, intake manifold and intercooler already? those 3 you could see a 200* drop easy.
 
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