got H&S 175 tune the other day...ran the truck pretty hard egts were around 1700-1800 for about 6 seconds coolant resivoir overfilled and air bubbles commin from the botttom...let the truck sit overnight opened radiator cap in the morning and all kinds of pressusre was built up...ran the truck on the 120 horse tune...still have air bubbles but not overflowing...runs perfect on stock hp....deleted Egr cooler no help..the truck does not overheat and the temp gauges varies around 20 degrees during driving... no coolant loss except for the overflowing....maybe head gasket???? going to try and retourqe head bolts......see if that helps....any help would be appreciated

 

whats your coolant mixture? i recommend 50/50 always, and i've been everywhere from the nevada desert in summer to adirondacks in upstate NY in january and i havent had any problems. as for the coolant itself...any foam? discoloration? is your engine oil still consistent and whats oil pressure lookin like?

1800 egt is as far as i'd let it go, the pistons and valves are coated with an inconel alloy to help withstand high temps during the dpf cleanout which is 1800 max.

 

truck has 30,000 miles on it has factory coolant in it....oil is normal..no discoloration or foam...

 

Since you deleted the EGR cooler, did you completely purge air out of the coolant system?

Otherwise, that could cause the symptoms you're describing.

 

did you figure it out bud

 

no didnt get it fixed yet and no i did not purge the system completly....how would i do that....everyone else is convinced it is the head gasket so its going on tuesday to get a new gasket and arp studs put in it...

 

you might try switching to Evans waterless coolant, It doesn't boil so it doesn't build pressure, I know alot of high RPM guy's started using it to keep from blowing freeze plugs.

 

let us know what it ends up being

 

ill deff keep you guys posted

 

well I hope it was not blown any news