Hello everyone, I am going to be starting on a rear mount set up shortly but need a few pointers.

First of all I will not have a stock bottom end

Have a scat 4340 348 crank
Eagle H bean 4340 rods
-24 SRP pistons .30

Should be at about 9.5:1 with the LT1 heads

Heads will be LE2 heads
LE ported intake manifold


My current mods are:
Hooker longtubes (will be using these with turbo set up just for the sake of being easy to switch back)
No cats
SLP exhaust
Underdrive pulley
AC gone with delete pulley
de-screened MAF
KN filter in stock ram air box
Hurst shifter
Upgraded clutch
Holley 52mm throttle body
Hotchkis front strut brace
Harwood fiberglass hood
Hypertech III tuned
Aluminum driveshaft
Electric water pump
2-12" slim fans

All other supporting mods for a turbo will be bought.

I really want to use a holset HX35 with this set up because I have one at my disposal. It is a 7 blade and set up for an external wastegate. I am just worried that the hot side is too small (12cm) which comes out to about .55 a/r.

I have an HKS 40mm wastegate as well as a good sized intercooler and a tial 50mm bov, a mound of stainless piping as well as aluminum.

So here is a run down of my questions.


#1 Do you see any problems running the hx-35 or should I search for a different exhaust housing
#2 Cam recommendation??
#3 What size charge pipe would be good to run under the vehicle?
#4 Do you guys set up a remote pump to send the oil back (I plan on tapping the pan for a return)
#5 What kind of boost levels do you think I could push with the turbo with the 9.5:1 compression?
# 6 I'm really looking for a RWHP estimate. I hate to bench race but I really want to hit 500rwhp and i'm pretty sure i can do it with this set up.

It seems like I am missing something so chime in and please feel free to discuss anything about the set up.

 

1) I don't know about Holset turbos, but a .55 A/R for a Garrett T4 turbine housing is too small. A .68 can be used for under 400hp, an .81 would be best, and a 96 can be used for really high HP.

2) I'd say 114 or wider LSA to avoid reversion, but I'm not the cam master.

3) 2.25"

4) The turbo is lower than the engine, so it NEEDS a return pump. Plus if you try to let oil pressure push it back to the engine, oil will leak out of the turbo center section and into the pipes. I welded a AN fitting to my valve cover and returned oil to there.

5) ~10psi on pump gas... depends on cam and stuff

6) eleventy threeve HP... maybe more.