I am still struggling with my EGTs while pulling. Yesterday, it was 95 F plus and driving down the interstate at 80, I really had to watch it. I have 4" exhaust, Kwik filter and DP tuner. I love the tuner and have the 40, 60 and 80 hp tow modes. I am pulling about 8,000 lbs loaded and the 40 hp mode is about all I can use. Thinking about talking to Jody about getting the 20 hp mode, good idea? I also have seen post talking about cold air intakes. I know with the Kwik filter I am pulling in hot air around the engine. Would a system that pulls air from the outside help? If so, any suggestion on type?

Any other ideas?

Thanks in advance, Chad

 

What are your EGT temps? I was pulling a nice grade with the TT this weekend and was just about 1100*, boost around 17 18# IIRC. My superchip was on performance, not sure of extra HP#. You could have a little boost leak or something, leaking up pipes?

 

EGT will push 1250 - 1300 when pulling a grade. I think I have all the manifold leaks fixed.


Thanks, Chad

 

Ambient temperature can really cause a lot of headaches...especially while towing. I pull in extreme temps of -30 all the way to 110 in some instances.

I have noticed that in temps below about 65 degrees, it is possible to put my foot to the wood on steep grades in 60T and never look at my EGT gauge since it won't hit 1100 degrees. However, the same grade in temps of 85-95 degrees and I have to back out of the throttle and sometimes downshift. I love early Spring and Fall for towing.

IT'S ALL ABOUT TEMPERATURE DROP ACROSS THE INTERCOOLER.

 

But you still have a boost or exhaust leak somewhere. Something is wrong because you shouldn't be able to hit those temps unless you are lugging the engine at low RPM's while driving over a 10,000+ ft pass and towing a load.

Also the 6637 filter isn't going to pull in hot air when you are driving. Once the truck starts moving, the intake air compared to the outside ambient air temps are negligible.

 

But when pulling slow up hills you don't get that much air across the IC compared to pulling 80MPH where you get alot of air. I know that when its 100*+ outside the air hitting the IC IS already warmer but it will still cool the intake air.

Mybe this is a newbee question but doesn't the IC just cool the intake air for a better burn and more power and high EGT's are from not enough air and to much fuel? And thats where you get high EGT's. Maybe I am looking at things wrong here.

 

+1 ... Try getting a more efficient intercooler.

 

At low engine speeds a larger intercooler really won't do much. If you aren't making the boost, there isn't any air to cool off. Larger intercoolers do make a difference when you are building boost, even at lower driving speeds. Note the differences when I talk about engine speed and driving speed.

When you add more fuel, you need more air. A larger intercooler can compliment a bigger turbo, injectors, and/or high HP chip as the stock intercooler can become a restriction.

In this situation though, Schlichtemeier is already running an intake, exhaust, and apparently even the 40 hp tow tune is still spiking EGT's too high. A larger intercooler won't do anything to fix that, since EGT's on the 40 tow setting are very low on a healthy stock truck. Something else is wrong with the truck. You don't put a bandaid on a broken arm.

I'm speaking from personal experience on this. Last summer I was still running stock exhaust, stock turbo, etc with a 6637 intake and DP-Tuner. Towing a dump trailer up 8% grades in the 40 hp tow tune it was extremely difficult to get temps over 1150. The trailer weighed in at over 11K lbs filled with rocks. Also this was with 36" tires, stock 3.73 gears, and towing at altitude. The only time I could get temps high in the 40 tow setting was when I developed a boost leak. At that time EGT's could peg 1300 empty on the tow setting at WOT, and I hit over 1500 in the 80 econo tune at WOT. Fixed the boost leak and never saw those temps again.

 

So Curtis a larger intercooler will drop EGT's because of the stockers restriction at higher engine speed no matter how fast your going or how much airs moving across the IC?

 

Not quite. It is not a restriction thing. It is a boost pressure thing. The more you compress the the air(higher boost) the hotter the air will get. The higher the RPM and load, the more boost you can make. At low boost levels, usually low rpm, you are not making much boost, and therefore not much heat, so the intercoolers effect becomes less and less at lower boost levels.

As already mentioned, if you have high EGT's at cruising rpm's and low boost(10psi) then there is another issue other than the intercooler. If you have 25-30 psi of boost and high egt's then that is indicitave of needing a larger or more efficient intercooler.

 

Have you tried removing stock IC and cleaning the coils? with as many miles as we all put on our trucks I would think that this could be a huge help.

I also agree with Curtis there is another boost leak somewhere that is not letting the cold air get into the engine.

 

i have the banks 6.o intercooler and i still get pretty high egts as well when towing up the passes!!! i have 20-40-60 tow and 80 econo. 20 tow is great around town but will yeild just as high if not higher egts than 40 tow dont ask me why but it dont work as well as 40 tow for me. i can have 25 lbs of boost when climbing a pass and my egts will be right at 1200 plus and i still have a little go pedal left. truthfully i didnt notice a ton of difference when i installed the larger intercooler. truck runs great though and im over all pretty happy.