I have a B18c with the following mods:

Peakboost turbo kit
3" turbo back exhaust
525cc injectors
Walbro 255 fuel pump
t3/t04e .57 trim
stock radiator with electric fan
Central Florida Turbo tuned on crome at 9psi

The problem im having is running hot at highway speeds like 70-80 mph.....it runs normal at idle and even city driving. It's not even a problem when i run it hard....it's just at cruising speeds.....Any suggestions of what could be causing this???

 

did you touch the radiator when you installed the turbo setup? If not, I'd say headgasket issue, but my first guess would be an airbubble in the system.

 

i had the same problem on the highway. took it back to my tuner. i forgot if he took or add timing around the highway rpm range


i try a new radiator first and it did not work for me so i took it back to my tuner. so far so good

 

had the issue on the way to the tuner....they found some air bubbles and got them out, but still happening....it doesn't get to the red...just half way b/n red and normal