Compound Turbo Thread

[BerettaDan]

Since you have alot of experience would you run a smaller turbine housing on the hx55. I would like to find a t4 housing.

 

[Kevin Jewer]

My advice is to run the biggest hotside you can get on the atmospheric turbo. A smaller one will spool quicker, especially with a smaller HP compressor like that 68HTA, but back pressure goes up. If you do decide to try a T4 housing, go with the biggest one you can find.

 

[BerettaDan]

One last question I have a hx40 in a .55 housing. Witch would be better for the small turbo hx40 or the 68hta

 

[Kevin Jewer]

Either should work. THe HX40 might have a little less total back pressure, but the 68hta is a good match too particularly on the compressor side.

 

[Kevin Jewer]

I've got mine running again on the compound turbos. Starting out on WG spring it's making 42 pis boost, 50 psi back pressure, and ran a 5.48 at 128 on a 1.23 60 foot, which all sounds good to me. I'm going to turn the boost up to 48 psi or so and run some low 5s for a while.