John Kennedy, many thanks for posting the dyno test results on your exhaust system. Your runs demonstrate how EGT is tied to airflow and boost levels. Which raises a question.

I notice how boost is tapering off as RPM approaches 3000, and EGT is rising. Is the stock wastegate opening, and if so is there a simple/inexpensive/safe way to keep it from doing so? I suppose I could get a Banks Big Head, but I really can’t justify it. A spring or something is more like it.

My Duramax is used for towing a 15k trailer, often on long mountain grades. I run my Juice/Attitude in Level 1 or 2, and find that I hit the EGT limiter (set at 1320°) on long climbs. Would more boost keep this from happening?

Visit Heathdiesel.com and he's got a product that may help.
Not sure what years it works on but the turbo master is a good product. I'm getting one soon.
Mark

Get a Banks Big Head.

Set up correctly it will help!

A few things one needs to remember is that boost and airflow are related but not one in the same. As boost rises so does the intake air temperature, a rise in intake air temperature wiil cause EGT to rise not lower. The other side is that with increased airflow EGT will drop as the AFR changes. So by reduceing the backpressure with an exhaust system(any brand) you will se a reduction of EGT as you have allowed the hot gases out of the cylinder quicker and allowed more air into the cylinder by reducing backpressure. The increase in the air in the cylinder along with the low heat is why you see the EGT reduction. Most exhaust system show a slight rise in the intake boost pressure because of this. Now on a LLY as the computer learns it will reduce the boost increase back to stock levels with time. If you want a simple boost increase take a piece of 1/4" steel or copper tube about 3" long. In the middle of the tube drill a 1/8" hole. Now locate the wastegate hose and cut the rubber hose in the middle. Install the tube with a few clamps in the hose but leave the hole uncovered. This should raise your boost level about 2 - 3 psi. Cost less than 5 bucks with about a 1/2 hour of you time.

John Kennedy, many thanks for posting the dyno test results on your exhaust system. Your runs demonstrate how EGT is tied to airflow and boost levels. Which raises a question.

I notice how boost is tapering off as RPM approaches 3000, and EGT is rising. Is the stock wastegate opening, and if so is there a simple/inexpensive/safe way to keep it from doing so? I suppose I could get a Banks Big Head, but I really can’t justify it. A spring or something is more like it.

My Duramax is used for towing a 15k trailer, often on long mountain grades. I run my Juice/Attitude in Level 1 or 2, and find that I hit the EGT limiter (set at 1320°) on long climbs. Would more boost keep this from happening?


What boost levels are you seeing? (peak and fall off)

Edge really drops off the fueling in the upper RPM's so the boost will naturally fall. Also, EGT's will go up as HP increases with RPM.

I notice how boost is tapering off as RPM approaches 3000, and EGT is rising. Is the stock wastegate opening, and if so is there a simple/inexpensive/safe way to keep it from doing so?
My Duramax is used for towing a 15k trailer, often on long mountain grades. I run my Juice/Attitude in Level 1 or 2, and find that I hit the EGT limiter (set at 1320°) on long climbs. Would more boost keep this from happening?

Have you ever thought of water methanol injection? I have used it for about 4 months now and it makes all the difference in the world. You have water for cooling and methanol as an additional fuel. In other words you make more HP at lower temps.

what boost do you have it comming on at, or is it variable rate, how much volume are you using(what pressure and sise of nozzels) also your hp level, comparing it to what i have, thanks




I notice how boost is tapering off as RPM approaches 3000, and EGT is rising. Is the stock wastegate opening, and if so is there a simple/inexpensive/safe way to keep it from doing so?
My Duramax is used for towing a 15k trailer, often on long mountain grades. I run my Juice/Attitude in Level 1 or 2, and find that I hit the EGT limiter (set at 1320°) on long climbs. Would more boost keep this from happening?

Have you ever thought of water methanol injection? I have used it for about 4 months now and it makes all the difference in the world. You have water for cooling and methanol as an additional fuel. In other words you make more HP at lower temps.

what boost do you have it comming on at, or is it variable rate, how much volume are you using(what pressure and sise of nozzels) also your hp level, comparing it to what i have, thanks

It comes on around 17-18 psi. I run the dual nozzle set up and am currently running about a 50/50 mix. I think it actually runs better around 45m/55w. I am in the 450 range without the N2O on. Fuel pumps go in next weekend and I will dyno the following weekend. I have the 8 gallon tank in the bed. If you want pics send me your email because the files are large.

Karl

do you have any bogging from to much water on non wot, like 18lbs, i also like the 60/40 split, and seen a 40 hp increase on the dyno with wi, here was a link to the dyno sheets, you can send to fredw@telusplanet.net
http://dieselplace.com/forum/showthread.php?t=21901&page=2

I actually get better performance rolling into the throttle. If I mash it is rough and misses the shifts. When I run the 50/50 I get dieseling and incomplete combustion(popping) out the pipe at WOT. But the takeoff is torkie. I have found the lower mixes to be better. It will bog when the motor isn't warm. I wonder if it may be a program related issue we both have in common?

We are running almost the same equipment. I will be switching to another ECM soon. I will be dynoing in two weeks. We'll see what we come up with. i will be hitting it with WMI and N2O.