CR0067

Hey guys I`m building a diy 94z28 that I got very cheap (roller), and I`m using a Holset HT60 from a N14 cummins diesel. The question I have is on the hotside, can I come off the passenger side with a 2.5" log and merge into a 3" log on the driver side and go into the turbo with that same 3" pipe instead of running 2 seperate pipes and merging them at the turbo! looks to me you would save weight, have more room and there would be less fabrication involved. Anyone done this or see any drawbacks! Thanks!

cvccbum

I think Realquick did this idea on my turbo kit.

http://lt1boost.net/cast_manifold_kit

Look at the second kit, the driver side manifold connects to the passenger then to the turbo.

reamo04

with that ht60, i believe it is VERY similar to a t6 flange. but, if so, it will be impossible to form a single 3" pipe to the flange

RealQuick

http://www.lt1boost.net/log_manifold_kit

cause4panic

Talking about the flange to pipe connection, how do you guys form yours? does anyone sell preformed pieces?

Whats the biggest pipe a T4 and T6 flange will accept?

CR0067

Thanks! RealQuick that is very similar to what I`m talking about! BTW I know the single 3" pipe will not support the weight of the turbo which is why I`ll be running a support off the block to hold the turbo up and not put stress on the exhaust! Also I was thinking of going with a 3" dp to help with spooling this thing! What would you guys suggest! Also I`m running stock cam, stock heads w/spring upgrade and 10.5:1 compression 355 and also wanting to get it tuned in speed density but a couple of the tuners are wanting me to use the maf but I`ve heard that it can be a restriction and may cause issues depending on bov placement, not to mention I`ll have to buy one anyway! Opinions!

reamo04

do you have forged internals? 10.5 is high for boost any decent amount of boost. a ht60 is good for 700+ at the wheels. I tried finding one for a long time

boosted-lt1

+1 As a minimum you probably want to put a forged dished piston in there and ARP rod bolts while it's apart. You said 355" - what type of piston are you currently running?

I'm an advocate of a large DP but a lot of guys have excellent success with a 3", so it should work well.

-Scott.

reamo04

eric bazan dynod 752/728 at the wheels with a 5" reduced down toa 3"...id say a 3" does just fine

boosted-lt1

I totally understand and agree that a 3" will indeed work in most T4/V8 cars. I tend to take maybe more of a theoretical approach with some disregard to the practical - Not that I'm right more than some of the time

Knowing nothing about Bazan's setup - What could he have made with a true 5" DP? At first glance, any turbo requiring consideration of something near a 5" DP should make more than 750rwhp.

-Scott.

reamo04

fquick.com/blown396

you can read it there, but basically
396, 224/236 "blower cam", s400. log manifolds

CR0067

Yes, I know I`ve got high compression for a turbo setup, but I`m looking at a budget so I was looking at going with the summit forged speedpro LT1 kit but I may change my mind and go with some speedpro turbo/supercharger pistons and get a gasket kit seperately, it will be about $500 more but I guess it will be worth it! It just seems like if I spend that much I could have bought some diamond pistons for a couple hundred more, then I will second guess my cheap rods with high dollar pistons and the second guessing goes on! I already have some ohiocrank 5.7 pro I rods w/arp 8740 capscrews, (supposed to be good to 6-700 hp)! I`m only looking for about 10-12 psi or 500-550hp at the wheels through my 3800 nitrous stalled th350! I know the parts don`t really match well with a turbo setup but I really want to keep this budget under $3000 for everything including car! Race season has started around here and I`m getting the itch some kinda bad!