I ran my truck up to 12lbs of boost with my 4th nelson tune and seem to have busted the ring lands of 6 pistons. I have put some diamond forged pistons in and also had it balanced. I have not put it back in yet but soon. I was curious were some of you guys are pulling your boost ratings from?

 

The nipple on the rear passenger side of the Intake Manifold just under the engine cover. you have to break or cut the end off of the nipple and attach it with a 1/4" line. I used a piece of fuel line.

 

BTW. Nice truck macs406

 

i agree , that thing sits right! the truck behind it looks bad *** too.

 

Thanks guys. Straight axle is the only way to go. With 44" boggers and 4.10 gears i run high temps as well. Apparently everyone seem to have heat problems. When i put this motor back in i am going to use a duramax intercooler and i am also going to run the MAF sensor on the intake side of the turbo. Some people say it makes a difference.

 

EGT's are a concern, both for the cats and pistons. The Dodge motors run high EGT's normally, and extremely high with FI. The turbo size is not the reason, it is the boost level and intake air temps and the resultant detonation that comes with it. 5psi with a T60 is still 5psi with a GT67. You will also move your power curve higher in the RPM band which will feel like a low end power loss. Unless you are boosting at or near the efficiency of the T60 ( about 14 psi ) I would stick with it.
Also true is the COT enrichment. Fuel cools the cats down and also kill them over time.
Iron heads are actually more suseptible to detonation than aluminum ( thermal dispersion ). Iron heads at the same compression ratio will make the problems worse, not better.
FWIW I had decent A/F and knock parameters when I lunched the pistons and rings. High EGT's were what ultimately killed everything, that and my cheapo tuning ( 9psi boost, no IC or meth, high altitude tune ).

 

I ran some G-tech 1/4 miles yesterday and watch my EGT gauge, It hits 1600deg about the time the truck shifts into 3rd. I wonder how hot you can go before you start seeing ill effects at the track or pulling a hill?
I know a fairlly short trip down the track (hopfully less than 13 sec) is a lot different than pulling a hill for 5 miles.
And Does ANY one have any idea whats the hotest EGTs this trucks run N/A?????????

 

I saw EGT's of 1350 towing before the turbo install. Now with 5 psi I see 1600. I actually had a tune that kept the EGT's at 1350 while towing but this was because my A\F ratio was 9.5 : 1. I thought this to be a little rich and I could feel it. I leaned it out to the mid 11's and it was a lot stronger but in turn raised my EGT's to max of 1600. On anything short of an 8 percent grade I see 1450 to 1500 EGT's.

As for the turbo size. I tried 3 different Turbines (.81, .96 and 1.03 ) I noticed a very big difference in EGT's. The larger the Turbine the lower the temps. I just didn't like the extra lag of the larger housing. I didnt hit max boost until 3500 rpm. I now use the .96 and hit max boost at 2500.

 

When were you seeing max boost on the .81?

 

If I remember it was real quick like 2000 RPM. The problem was the temps were real high real fast. .96 A\R seems to be the best for both towing and performance for the 6.0l, at least in my case.