Diesel Auto Power
Join Date: Feb 2006
Location: Layton UT
Thanked 1,379 Times in 1,095 Posts
iTrader Score: 21 reviews
Keep your temps low so you do not melt pistons or warp turbine wheels on the turbo.
I know there will be plenty of people that disagree but think of this as a rough guide: sustained temp of 1100
1200 for 30 seconds,
1300 for 10-15
1400 for 5
higher... why??? Thats why they make bigger turbos and products for better airflow like the tunnel ram, 3pc manifolds, cams, water injection, porting etc
Keep your boost low so you do not blow your head gasket.
Keep your drive pressures low so you do not create a restriction on the exhaust side causing unnecessary boost/restriction or blow your head gasket
Do not overboost as you will overspeed the turbo and run the turbo beyond its efficiency range = hot boost and less dense air = less effecient and expending MORE energy to be less efficient.
hy35 =280hp 28psi
hx35= 300hp 32psi
35/40=350hp 35psi (bigger compressor wheel but same 3" turbine outlet and bad wastegate design)
hx40 or he351 =400hp 40psi (4" outlet, he351 has good wastegate and super40 wheel, but 9cm housing so I am putting it slightly behind the super40 with 16cm housing)
s300 57/65/14 (like superB) or super40=425HP 42psi
s300 62/65/12=450HP 42psi
s300 62/71/14=500HP 45psi
You can run bigger/hotter than the list, but expect decreased turbo life, head gasket problems and risk overheating cylinders 1 & 6 which run hot anyways. (a good stock turbo is still worth $300, a blown one is worth $0-100 if it can be rebuilt)