Slider9751

iTrader: (1)

Ok, just to start off yes I have tried searching.

I am currently building a 1995 Z28 that I am swapping a 4.8 truck engine out of a 2000 silverado. The engine is in amazing shape despite the 270k kms on it. I am using an ls1 intake, ls6 valve springs and stock bottom. Wanting to run a single turbo but I would consider running twins. I was planning on doing 2.5" pipes into the merge into an ebay gt45. But after doing some more research I'm not sure how fast this turbo would spool on the little 4.8. Does anyone have an educated guess on when this turbo would spool?

I'm shooting for around 450rwhp and around the same amount of torque. But because its a daily driver I want the turbo to come on strong down low (around 2300rpm) and pull to 6500-7000rpm. Is there a turbo out there that could do this for cheap. And would the 2.5" hotside be too big? Aswell as a 2.5" coldside?
Thanks, Roger

Blackpanther99

iTrader: (8)

A gt45 should respond very well down low.

Twin turbo c5

Gt45 will work great and there not expensive.

Ryans99ls1

iTrader: (16)

You could run 2.25" crossover pipes or hell even 2" pipes to help it spool earlier. Keep the coldside to 3"

mrstepheneades

Yeah I used 2.5 crossover and I probably loss some spool time there also. For no more power goal than that id use 2" crossover lol.

willizm

iTrader: (10)

a TC78 would be a good affordable choice as well. It will spool quick and since you are SBE you won't choke the turbo by pushing more boost.

flcamero

+1 quick spool is worth it's weight in gold. Big turbo's bite for daily driving.

mrstepheneades

But they rule the highway runs

willizm

iTrader: (10)

Yeah but if he's only pushing modest boost levels on a SBE then I'd think quick response would be more important since he will probably only push 8psi

Slider9751

iTrader: (1)

Thanks a lot guys. I'll stick with the gt45 and run a 2.25" merge to get a better spool but still have a little more pipe if I wanna turn up the power later on. I'll also run the 3" cold side. Thanks again guys.

Blackpanther99

iTrader: (8)

It will be a fun daily! I can guarantee you that! Lol